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kernel/fork.c
59.5 KB
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/* * linux/kernel/fork.c * * Copyright (C) 1991, 1992 Linus Torvalds */ /* * 'fork.c' contains the help-routines for the 'fork' system call * (see also entry.S and others). * Fork is rather simple, once you get the hang of it, but the memory * management can be a bitch. See 'mm/memory.c': 'copy_page_range()' */ |
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#include <linux/slab.h> |
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#include <linux/sched/autogroup.h> |
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#include <linux/sched/mm.h> |
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#include <linux/sched/coredump.h> |
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#include <linux/sched/user.h> |
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#include <linux/sched/numa_balancing.h> |
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#include <linux/sched/stat.h> |
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#include <linux/sched/task.h> |
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#include <linux/sched/task_stack.h> |
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#include <linux/sched/cputime.h> |
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#include <linux/rtmutex.h> |
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#include <linux/init.h> #include <linux/unistd.h> |
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#include <linux/module.h> #include <linux/vmalloc.h> #include <linux/completion.h> |
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#include <linux/personality.h> #include <linux/mempolicy.h> #include <linux/sem.h> #include <linux/file.h> |
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#include <linux/fdtable.h> |
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#include <linux/iocontext.h> |
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#include <linux/key.h> #include <linux/binfmts.h> #include <linux/mman.h> |
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#include <linux/mmu_notifier.h> |
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#include <linux/hmm.h> |
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#include <linux/fs.h> |
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#include <linux/mm.h> #include <linux/vmacache.h> |
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#include <linux/nsproxy.h> |
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#include <linux/capability.h> |
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#include <linux/cpu.h> |
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#include <linux/cgroup.h> |
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#include <linux/security.h> |
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#include <linux/hugetlb.h> |
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#include <linux/seccomp.h> |
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#include <linux/swap.h> #include <linux/syscalls.h> #include <linux/jiffies.h> #include <linux/futex.h> |
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#include <linux/compat.h> |
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#include <linux/kthread.h> |
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#include <linux/task_io_accounting_ops.h> |
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#include <linux/rcupdate.h> |
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#include <linux/ptrace.h> #include <linux/mount.h> #include <linux/audit.h> |
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#include <linux/memcontrol.h> |
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#include <linux/ftrace.h> |
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#include <linux/proc_fs.h> |
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#include <linux/profile.h> #include <linux/rmap.h> |
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#include <linux/ksm.h> |
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#include <linux/acct.h> |
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#include <linux/userfaultfd_k.h> |
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#include <linux/tsacct_kern.h> |
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#include <linux/cn_proc.h> |
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#include <linux/freezer.h> |
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#include <linux/delayacct.h> |
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#include <linux/taskstats_kern.h> |
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#include <linux/random.h> |
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#include <linux/tty.h> |
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#include <linux/blkdev.h> |
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#include <linux/fs_struct.h> |
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#include <linux/magic.h> |
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#include <linux/perf_event.h> |
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#include <linux/posix-timers.h> |
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#include <linux/user-return-notifier.h> |
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#include <linux/oom.h> |
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#include <linux/khugepaged.h> |
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#include <linux/signalfd.h> |
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#include <linux/uprobes.h> |
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#include <linux/aio.h> |
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#include <linux/compiler.h> |
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#include <linux/sysctl.h> |
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#include <linux/kcov.h> |
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#include <linux/livepatch.h> |
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#include <linux/thread_info.h> |
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#include <asm/pgtable.h> #include <asm/pgalloc.h> |
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#include <linux/uaccess.h> |
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#include <asm/mmu_context.h> #include <asm/cacheflush.h> #include <asm/tlbflush.h> |
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#include <trace/events/sched.h> |
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#define CREATE_TRACE_POINTS #include <trace/events/task.h> |
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/* |
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* Minimum number of threads to boot the kernel */ #define MIN_THREADS 20 /* * Maximum number of threads */ #define MAX_THREADS FUTEX_TID_MASK /* |
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* Protected counters by write_lock_irq(&tasklist_lock) */ unsigned long total_forks; /* Handle normal Linux uptimes. */ |
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int nr_threads; /* The idle threads do not count.. */ |
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int max_threads; /* tunable limit on nr_threads */ DEFINE_PER_CPU(unsigned long, process_counts) = 0; |
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__cacheline_aligned DEFINE_RWLOCK(tasklist_lock); /* outer */ |
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#ifdef CONFIG_PROVE_RCU int lockdep_tasklist_lock_is_held(void) { return lockdep_is_held(&tasklist_lock); } EXPORT_SYMBOL_GPL(lockdep_tasklist_lock_is_held); #endif /* #ifdef CONFIG_PROVE_RCU */ |
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int nr_processes(void) { int cpu; int total = 0; |
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for_each_possible_cpu(cpu) |
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total += per_cpu(process_counts, cpu); return total; } |
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void __weak arch_release_task_struct(struct task_struct *tsk) { } |
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#ifndef CONFIG_ARCH_TASK_STRUCT_ALLOCATOR |
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static struct kmem_cache *task_struct_cachep; |
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static inline struct task_struct *alloc_task_struct_node(int node) { return kmem_cache_alloc_node(task_struct_cachep, GFP_KERNEL, node); } |
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static inline void free_task_struct(struct task_struct *tsk) { |
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kmem_cache_free(task_struct_cachep, tsk); } |
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#endif |
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void __weak arch_release_thread_stack(unsigned long *stack) |
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{ } |
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#ifndef CONFIG_ARCH_THREAD_STACK_ALLOCATOR |
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|
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/* * Allocate pages if THREAD_SIZE is >= PAGE_SIZE, otherwise use a * kmemcache based allocator. */ |
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# if THREAD_SIZE >= PAGE_SIZE || defined(CONFIG_VMAP_STACK) |
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#ifdef CONFIG_VMAP_STACK /* * vmalloc() is a bit slow, and calling vfree() enough times will force a TLB * flush. Try to minimize the number of calls by caching stacks. */ #define NR_CACHED_STACKS 2 static DEFINE_PER_CPU(struct vm_struct *, cached_stacks[NR_CACHED_STACKS]); |
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static int free_vm_stack_cache(unsigned int cpu) { struct vm_struct **cached_vm_stacks = per_cpu_ptr(cached_stacks, cpu); int i; for (i = 0; i < NR_CACHED_STACKS; i++) { struct vm_struct *vm_stack = cached_vm_stacks[i]; if (!vm_stack) continue; vfree(vm_stack->addr); cached_vm_stacks[i] = NULL; } return 0; } |
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#endif |
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static unsigned long *alloc_thread_stack_node(struct task_struct *tsk, int node) |
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{ |
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#ifdef CONFIG_VMAP_STACK |
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void *stack; int i; |
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for (i = 0; i < NR_CACHED_STACKS; i++) { |
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struct vm_struct *s; s = this_cpu_xchg(cached_stacks[i], NULL); |
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if (!s) continue; |
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|
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/* Clear stale pointers from reused stack. */ memset(s->addr, 0, THREAD_SIZE); |
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|
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tsk->stack_vm_area = s; |
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return s->addr; } |
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|
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stack = __vmalloc_node_range(THREAD_SIZE, THREAD_ALIGN, |
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VMALLOC_START, VMALLOC_END, |
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THREADINFO_GFP, |
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PAGE_KERNEL, 0, node, __builtin_return_address(0)); |
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/* * We can't call find_vm_area() in interrupt context, and * free_thread_stack() can be called in interrupt context, * so cache the vm_struct. */ if (stack) tsk->stack_vm_area = find_vm_area(stack); return stack; #else |
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struct page *page = alloc_pages_node(node, THREADINFO_GFP, THREAD_SIZE_ORDER); |
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return page ? page_address(page) : NULL; |
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#endif |
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} |
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static inline void free_thread_stack(struct task_struct *tsk) |
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{ |
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#ifdef CONFIG_VMAP_STACK if (task_stack_vm_area(tsk)) { |
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int i; |
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for (i = 0; i < NR_CACHED_STACKS; i++) { |
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if (this_cpu_cmpxchg(cached_stacks[i], NULL, tsk->stack_vm_area) != NULL) |
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continue; |
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return; } |
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|
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vfree_atomic(tsk->stack); |
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return; } #endif __free_pages(virt_to_page(tsk->stack), THREAD_SIZE_ORDER); |
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} |
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# else |
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static struct kmem_cache *thread_stack_cache; |
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|
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static unsigned long *alloc_thread_stack_node(struct task_struct *tsk, |
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int node) { |
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return kmem_cache_alloc_node(thread_stack_cache, THREADINFO_GFP, node); |
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} |
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static void free_thread_stack(struct task_struct *tsk) |
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{ |
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kmem_cache_free(thread_stack_cache, tsk->stack); |
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} |
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void thread_stack_cache_init(void) |
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{ |
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thread_stack_cache = kmem_cache_create("thread_stack", THREAD_SIZE, |
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THREAD_SIZE, 0, NULL); |
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BUG_ON(thread_stack_cache == NULL); |
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} # endif |
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#endif |
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/* SLAB cache for signal_struct structures (tsk->signal) */ |
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static struct kmem_cache *signal_cachep; |
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/* SLAB cache for sighand_struct structures (tsk->sighand) */ |
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struct kmem_cache *sighand_cachep; |
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/* SLAB cache for files_struct structures (tsk->files) */ |
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struct kmem_cache *files_cachep; |
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/* SLAB cache for fs_struct structures (tsk->fs) */ |
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struct kmem_cache *fs_cachep; |
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/* SLAB cache for vm_area_struct structures */ |
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struct kmem_cache *vm_area_cachep; |
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/* SLAB cache for mm_struct structures (tsk->mm) */ |
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static struct kmem_cache *mm_cachep; |
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|
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static void account_kernel_stack(struct task_struct *tsk, int account) |
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{ |
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void *stack = task_stack_page(tsk); struct vm_struct *vm = task_stack_vm_area(tsk); BUILD_BUG_ON(IS_ENABLED(CONFIG_VMAP_STACK) && PAGE_SIZE % 1024 != 0); if (vm) { int i; BUG_ON(vm->nr_pages != THREAD_SIZE / PAGE_SIZE); for (i = 0; i < THREAD_SIZE / PAGE_SIZE; i++) { mod_zone_page_state(page_zone(vm->pages[i]), NR_KERNEL_STACK_KB, PAGE_SIZE / 1024 * account); } /* All stack pages belong to the same memcg. */ |
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mod_memcg_page_state(vm->pages[0], MEMCG_KERNEL_STACK_KB, account * (THREAD_SIZE / 1024)); |
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} else { /* * All stack pages are in the same zone and belong to the * same memcg. */ struct page *first_page = virt_to_page(stack); mod_zone_page_state(page_zone(first_page), NR_KERNEL_STACK_KB, THREAD_SIZE / 1024 * account); |
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mod_memcg_page_state(first_page, MEMCG_KERNEL_STACK_KB, account * (THREAD_SIZE / 1024)); |
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} |
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} |
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static void release_task_stack(struct task_struct *tsk) |
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{ |
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if (WARN_ON(tsk->state != TASK_DEAD)) return; /* Better to leak the stack than to free prematurely */ |
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account_kernel_stack(tsk, -1); |
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arch_release_thread_stack(tsk->stack); |
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free_thread_stack(tsk); |
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tsk->stack = NULL; #ifdef CONFIG_VMAP_STACK tsk->stack_vm_area = NULL; #endif } #ifdef CONFIG_THREAD_INFO_IN_TASK void put_task_stack(struct task_struct *tsk) { if (atomic_dec_and_test(&tsk->stack_refcount)) release_task_stack(tsk); } #endif void free_task(struct task_struct *tsk) { #ifndef CONFIG_THREAD_INFO_IN_TASK /* * The task is finally done with both the stack and thread_info, * so free both. */ release_task_stack(tsk); #else /* * If the task had a separate stack allocation, it should be gone * by now. */ WARN_ON_ONCE(atomic_read(&tsk->stack_refcount) != 0); #endif |
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rt_mutex_debug_task_free(tsk); |
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ftrace_graph_exit_task(tsk); |
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put_seccomp_filter(tsk); |
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arch_release_task_struct(tsk); |
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if (tsk->flags & PF_KTHREAD) free_kthread_struct(tsk); |
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free_task_struct(tsk); } EXPORT_SYMBOL(free_task); |
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static inline void free_signal_struct(struct signal_struct *sig) { |
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taskstats_tgid_free(sig); |
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sched_autogroup_exit(sig); |
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/* * __mmdrop is not safe to call from softirq context on x86 due to * pgd_dtor so postpone it to the async context */ |
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if (sig->oom_mm) |
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mmdrop_async(sig->oom_mm); |
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kmem_cache_free(signal_cachep, sig); } static inline void put_signal_struct(struct signal_struct *sig) { |
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if (atomic_dec_and_test(&sig->sigcnt)) |
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free_signal_struct(sig); } |
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void __put_task_struct(struct task_struct *tsk) |
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{ |
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WARN_ON(!tsk->exit_state); |
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WARN_ON(atomic_read(&tsk->usage)); WARN_ON(tsk == current); |
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cgroup_free(tsk); |
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task_numa_free(tsk); |
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security_task_free(tsk); |
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exit_creds(tsk); |
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delayacct_tsk_free(tsk); |
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put_signal_struct(tsk->signal); |
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if (!profile_handoff_task(tsk)) free_task(tsk); } |
77c100c83 export pid symbol... |
402 |
EXPORT_SYMBOL_GPL(__put_task_struct); |
1da177e4c Linux-2.6.12-rc2 |
403 |
|
6c0a9fa62 fork: Remove the ... |
404 |
void __init __weak arch_task_cache_init(void) { } |
61c4628b5 x86, fpu: split F... |
405 |
|
ff691f6e0 kernel/fork.c: ne... |
406 407 408 |
/* * set_max_threads */ |
16db3d3f1 kernel/sysctl.c: ... |
409 |
static void set_max_threads(unsigned int max_threads_suggested) |
ff691f6e0 kernel/fork.c: ne... |
410 |
{ |
ac1b398de kernel/fork.c: av... |
411 |
u64 threads; |
ff691f6e0 kernel/fork.c: ne... |
412 413 |
/* |
ac1b398de kernel/fork.c: av... |
414 415 |
* The number of threads shall be limited such that the thread * structures may only consume a small part of the available memory. |
ff691f6e0 kernel/fork.c: ne... |
416 |
*/ |
ac1b398de kernel/fork.c: av... |
417 418 419 420 421 |
if (fls64(totalram_pages) + fls64(PAGE_SIZE) > 64) threads = MAX_THREADS; else threads = div64_u64((u64) totalram_pages * (u64) PAGE_SIZE, (u64) THREAD_SIZE * 8UL); |
16db3d3f1 kernel/sysctl.c: ... |
422 423 |
if (threads > max_threads_suggested) threads = max_threads_suggested; |
ac1b398de kernel/fork.c: av... |
424 |
max_threads = clamp_t(u64, threads, MIN_THREADS, MAX_THREADS); |
ff691f6e0 kernel/fork.c: ne... |
425 |
} |
5aaeb5c01 x86/fpu, sched: I... |
426 427 428 429 |
#ifdef CONFIG_ARCH_WANTS_DYNAMIC_TASK_STRUCT /* Initialized by the architecture: */ int arch_task_struct_size __read_mostly; #endif |
0c8c0f03e x86/fpu, sched: D... |
430 |
|
ff691f6e0 kernel/fork.c: ne... |
431 |
void __init fork_init(void) |
1da177e4c Linux-2.6.12-rc2 |
432 |
{ |
25f9c0817 userns: Generaliz... |
433 |
int i; |
f5e102873 task_allocator: U... |
434 |
#ifndef CONFIG_ARCH_TASK_STRUCT_ALLOCATOR |
1da177e4c Linux-2.6.12-rc2 |
435 |
#ifndef ARCH_MIN_TASKALIGN |
e274795ea locking/mutex: Fi... |
436 |
#define ARCH_MIN_TASKALIGN 0 |
1da177e4c Linux-2.6.12-rc2 |
437 |
#endif |
95cb64c1f fork: Fix task_st... |
438 |
int align = max_t(int, L1_CACHE_BYTES, ARCH_MIN_TASKALIGN); |
e274795ea locking/mutex: Fi... |
439 |
|
1da177e4c Linux-2.6.12-rc2 |
440 |
/* create a slab on which task_structs can be allocated */ |
5d097056c kmemcg: account c... |
441 |
task_struct_cachep = kmem_cache_create("task_struct", |
e274795ea locking/mutex: Fi... |
442 |
arch_task_struct_size, align, |
ae63fd26b kmemcheck: stop u... |
443 |
SLAB_PANIC|SLAB_ACCOUNT, NULL); |
1da177e4c Linux-2.6.12-rc2 |
444 |
#endif |
61c4628b5 x86, fpu: split F... |
445 446 |
/* do the arch specific task caches init */ arch_task_cache_init(); |
16db3d3f1 kernel/sysctl.c: ... |
447 |
set_max_threads(MAX_THREADS); |
1da177e4c Linux-2.6.12-rc2 |
448 449 450 451 452 |
init_task.signal->rlim[RLIMIT_NPROC].rlim_cur = max_threads/2; init_task.signal->rlim[RLIMIT_NPROC].rlim_max = max_threads/2; init_task.signal->rlim[RLIMIT_SIGPENDING] = init_task.signal->rlim[RLIMIT_NPROC]; |
b376c3e1b userns: Add a lim... |
453 |
|
25f9c0817 userns: Generaliz... |
454 455 456 |
for (i = 0; i < UCOUNT_COUNTS; i++) { init_user_ns.ucount_max[i] = max_threads/2; } |
19659c59a fork: free vmappe... |
457 458 459 460 461 |
#ifdef CONFIG_VMAP_STACK cpuhp_setup_state(CPUHP_BP_PREPARE_DYN, "fork:vm_stack_cache", NULL, free_vm_stack_cache); #endif |
b09be676e locking/lockdep: ... |
462 463 |
lockdep_init_task(&init_task); |
1da177e4c Linux-2.6.12-rc2 |
464 |
} |
52f5684c8 kernel: use macro... |
465 |
int __weak arch_dup_task_struct(struct task_struct *dst, |
61c4628b5 x86, fpu: split F... |
466 467 468 469 470 |
struct task_struct *src) { *dst = *src; return 0; } |
d4311ff1a init/main.c: Give... |
471 472 473 474 475 476 477 |
void set_task_stack_end_magic(struct task_struct *tsk) { unsigned long *stackend; stackend = end_of_stack(tsk); *stackend = STACK_END_MAGIC; /* for overflow detection */ } |
725fc629f kernek/fork.c: al... |
478 |
static struct task_struct *dup_task_struct(struct task_struct *orig, int node) |
1da177e4c Linux-2.6.12-rc2 |
479 480 |
{ struct task_struct *tsk; |
b235beea9 Clarify naming of... |
481 |
unsigned long *stack; |
ba14a194a fork: Add generic... |
482 |
struct vm_struct *stack_vm_area; |
3e26c149c mm: dirty balanci... |
483 |
int err; |
1da177e4c Linux-2.6.12-rc2 |
484 |
|
725fc629f kernek/fork.c: al... |
485 486 |
if (node == NUMA_NO_NODE) node = tsk_fork_get_node(orig); |
504f52b54 mm: NUMA aware al... |
487 |
tsk = alloc_task_struct_node(node); |
1da177e4c Linux-2.6.12-rc2 |
488 489 |
if (!tsk) return NULL; |
b235beea9 Clarify naming of... |
490 491 |
stack = alloc_thread_stack_node(tsk, node); if (!stack) |
f19b9f74b fork: fix error h... |
492 |
goto free_tsk; |
1da177e4c Linux-2.6.12-rc2 |
493 |
|
ba14a194a fork: Add generic... |
494 |
stack_vm_area = task_stack_vm_area(tsk); |
fb0a685cb kernel/fork.c: fi... |
495 |
err = arch_dup_task_struct(tsk, orig); |
ba14a194a fork: Add generic... |
496 497 498 499 500 501 502 503 504 505 |
/* * arch_dup_task_struct() clobbers the stack-related fields. Make * sure they're properly initialized before using any stack-related * functions again. */ tsk->stack = stack; #ifdef CONFIG_VMAP_STACK tsk->stack_vm_area = stack_vm_area; #endif |
68f24b08e sched/core: Free ... |
506 507 508 |
#ifdef CONFIG_THREAD_INFO_IN_TASK atomic_set(&tsk->stack_refcount, 1); #endif |
ba14a194a fork: Add generic... |
509 |
|
164c33c6a sched: Fix fork()... |
510 |
if (err) |
b235beea9 Clarify naming of... |
511 |
goto free_stack; |
164c33c6a sched: Fix fork()... |
512 |
|
dbd952127 seccomp: introduc... |
513 514 515 516 517 518 519 520 521 |
#ifdef CONFIG_SECCOMP /* * We must handle setting up seccomp filters once we're under * the sighand lock in case orig has changed between now and * then. Until then, filter must be NULL to avoid messing up * the usage counts on the error path calling free_task. */ tsk->seccomp.filter = NULL; #endif |
87bec58a5 revert "sched: Fi... |
522 523 |
setup_thread_stack(tsk, orig); |
8e7cac798 core: Fix user re... |
524 |
clear_user_return_notifier(tsk); |
f26f9aff6 Sched: fix skip_c... |
525 |
clear_tsk_need_resched(tsk); |
d4311ff1a init/main.c: Give... |
526 |
set_task_stack_end_magic(tsk); |
1da177e4c Linux-2.6.12-rc2 |
527 |
|
0a4254058 [PATCH] Add the c... |
528 |
#ifdef CONFIG_CC_STACKPROTECTOR |
7cd815bce fork,random: use ... |
529 |
tsk->stack_canary = get_random_canary(); |
0a4254058 [PATCH] Add the c... |
530 |
#endif |
fb0a685cb kernel/fork.c: fi... |
531 532 533 534 535 |
/* * One for us, one for whoever does the "release_task()" (usually * parent) */ atomic_set(&tsk->usage, 2); |
6c5c93415 [PATCH] ifdef blk... |
536 |
#ifdef CONFIG_BLK_DEV_IO_TRACE |
2056a782f [PATCH] Block que... |
537 |
tsk->btrace_seq = 0; |
6c5c93415 [PATCH] ifdef blk... |
538 |
#endif |
a0aa7f68a [PATCH] Don't inh... |
539 |
tsk->splice_pipe = NULL; |
5640f7685 net: use a per ta... |
540 |
tsk->task_frag.page = NULL; |
093e5840a sched/core: Reset... |
541 |
tsk->wake_q.next = NULL; |
c6a7f5728 mm: oom analysis:... |
542 |
|
ba14a194a fork: Add generic... |
543 |
account_kernel_stack(tsk, 1); |
c6a7f5728 mm: oom analysis:... |
544 |
|
5c9a8750a kernel: add kcov ... |
545 |
kcov_task_init(tsk); |
e41d58185 fault-inject: sup... |
546 547 548 |
#ifdef CONFIG_FAULT_INJECTION tsk->fail_nth = 0; #endif |
1da177e4c Linux-2.6.12-rc2 |
549 |
return tsk; |
61c4628b5 x86, fpu: split F... |
550 |
|
b235beea9 Clarify naming of... |
551 |
free_stack: |
ba14a194a fork: Add generic... |
552 |
free_thread_stack(tsk); |
f19b9f74b fork: fix error h... |
553 |
free_tsk: |
61c4628b5 x86, fpu: split F... |
554 555 |
free_task_struct(tsk); return NULL; |
1da177e4c Linux-2.6.12-rc2 |
556 557 558 |
} #ifdef CONFIG_MMU |
0766f788e latent_entropy: M... |
559 560 |
static __latent_entropy int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm) |
1da177e4c Linux-2.6.12-rc2 |
561 |
{ |
297c5eee3 mm: make the vma ... |
562 |
struct vm_area_struct *mpnt, *tmp, *prev, **pprev; |
1da177e4c Linux-2.6.12-rc2 |
563 564 565 |
struct rb_node **rb_link, *rb_parent; int retval; unsigned long charge; |
893e26e61 userfaultfd: non-... |
566 |
LIST_HEAD(uf); |
1da177e4c Linux-2.6.12-rc2 |
567 |
|
32cdba1e0 uprobes: Use perc... |
568 |
uprobe_start_dup_mmap(); |
7c0512679 mm, fork: make du... |
569 570 571 572 |
if (down_write_killable(&oldmm->mmap_sem)) { retval = -EINTR; goto fail_uprobe_end; } |
ec8c0446b [PATCH] Optimize ... |
573 |
flush_cache_dup_mm(oldmm); |
f8ac4ec9c uprobes: Introduc... |
574 |
uprobe_dup_mmap(oldmm, mm); |
ad3394517 [PATCH] lockdep: ... |
575 576 577 578 |
/* * Not linked in yet - no deadlock potential: */ down_write_nested(&mm->mmap_sem, SINGLE_DEPTH_NESTING); |
7ee782325 [PATCH] mm: dup_m... |
579 |
|
90f31d0ea mm: rcu-protected... |
580 581 |
/* No ordering required: file already has been exposed. */ RCU_INIT_POINTER(mm->exe_file, get_mm_exe_file(oldmm)); |
4f7d46143 fork: copy mm's v... |
582 |
mm->total_vm = oldmm->total_vm; |
846383359 mm: rework virtua... |
583 |
mm->data_vm = oldmm->data_vm; |
4f7d46143 fork: copy mm's v... |
584 585 |
mm->exec_vm = oldmm->exec_vm; mm->stack_vm = oldmm->stack_vm; |
1da177e4c Linux-2.6.12-rc2 |
586 587 588 |
rb_link = &mm->mm_rb.rb_node; rb_parent = NULL; pprev = &mm->mmap; |
f8af4da3b ksm: the mm inter... |
589 590 591 |
retval = ksm_fork(mm, oldmm); if (retval) goto out; |
ba76149f4 thp: khugepaged |
592 593 594 |
retval = khugepaged_fork(mm, oldmm); if (retval) goto out; |
1da177e4c Linux-2.6.12-rc2 |
595 |
|
297c5eee3 mm: make the vma ... |
596 |
prev = NULL; |
fd3e42fcc [PATCH] mm: dup_m... |
597 |
for (mpnt = oldmm->mmap; mpnt; mpnt = mpnt->vm_next) { |
1da177e4c Linux-2.6.12-rc2 |
598 599 600 |
struct file *file; if (mpnt->vm_flags & VM_DONTCOPY) { |
846383359 mm: rework virtua... |
601 |
vm_stat_account(mm, mpnt->vm_flags, -vma_pages(mpnt)); |
1da177e4c Linux-2.6.12-rc2 |
602 603 604 605 |
continue; } charge = 0; if (mpnt->vm_flags & VM_ACCOUNT) { |
b2412b7fa fork: use vma_pag... |
606 |
unsigned long len = vma_pages(mpnt); |
191c54244 mm: collapse secu... |
607 |
if (security_vm_enough_memory_mm(oldmm, len)) /* sic */ |
1da177e4c Linux-2.6.12-rc2 |
608 609 610 |
goto fail_nomem; charge = len; } |
e94b17660 [PATCH] slab: rem... |
611 |
tmp = kmem_cache_alloc(vm_area_cachep, GFP_KERNEL); |
1da177e4c Linux-2.6.12-rc2 |
612 613 614 |
if (!tmp) goto fail_nomem; *tmp = *mpnt; |
5beb49305 mm: change anon_v... |
615 |
INIT_LIST_HEAD(&tmp->anon_vma_chain); |
ef0855d33 mm: mempolicy: tu... |
616 617 |
retval = vma_dup_policy(mpnt, tmp); if (retval) |
1da177e4c Linux-2.6.12-rc2 |
618 |
goto fail_nomem_policy; |
a247c3a97 rmap: fix walk du... |
619 |
tmp->vm_mm = mm; |
893e26e61 userfaultfd: non-... |
620 621 622 |
retval = dup_userfaultfd(tmp, &uf); if (retval) goto fail_nomem_anon_vma_fork; |
d2cd9ede6 mm,fork: introduc... |
623 624 625 626 627 628 |
if (tmp->vm_flags & VM_WIPEONFORK) { /* VM_WIPEONFORK gets a clean slate in the child. */ tmp->anon_vma = NULL; if (anon_vma_prepare(tmp)) goto fail_nomem_anon_vma_fork; } else if (anon_vma_fork(tmp, mpnt)) |
5beb49305 mm: change anon_v... |
629 |
goto fail_nomem_anon_vma_fork; |
893e26e61 userfaultfd: non-... |
630 |
tmp->vm_flags &= ~(VM_LOCKED | VM_LOCKONFAULT); |
297c5eee3 mm: make the vma ... |
631 |
tmp->vm_next = tmp->vm_prev = NULL; |
1da177e4c Linux-2.6.12-rc2 |
632 633 |
file = tmp->vm_file; if (file) { |
496ad9aa8 new helper: file_... |
634 |
struct inode *inode = file_inode(file); |
b88ed2059 fix mapping_writa... |
635 |
struct address_space *mapping = file->f_mapping; |
1da177e4c Linux-2.6.12-rc2 |
636 637 638 |
get_file(file); if (tmp->vm_flags & VM_DENYWRITE) atomic_dec(&inode->i_writecount); |
83cde9e8b mm: use new helpe... |
639 |
i_mmap_lock_write(mapping); |
b88ed2059 fix mapping_writa... |
640 |
if (tmp->vm_flags & VM_SHARED) |
4bb5f5d93 mm: allow drivers... |
641 |
atomic_inc(&mapping->i_mmap_writable); |
b88ed2059 fix mapping_writa... |
642 643 |
flush_dcache_mmap_lock(mapping); /* insert tmp into the share list, just after mpnt */ |
27ba0644e rmap: drop suppor... |
644 645 |
vma_interval_tree_insert_after(tmp, mpnt, &mapping->i_mmap); |
b88ed2059 fix mapping_writa... |
646 |
flush_dcache_mmap_unlock(mapping); |
83cde9e8b mm: use new helpe... |
647 |
i_mmap_unlock_write(mapping); |
1da177e4c Linux-2.6.12-rc2 |
648 649 650 |
} /* |
a1e78772d hugetlb: reserve ... |
651 652 653 654 655 656 657 658 |
* Clear hugetlb-related page reserves for children. This only * affects MAP_PRIVATE mappings. Faults generated by the child * are not guaranteed to succeed, even if read-only */ if (is_vm_hugetlb_page(tmp)) reset_vma_resv_huge_pages(tmp); /* |
7ee782325 [PATCH] mm: dup_m... |
659 |
* Link in the new vma and copy the page table entries. |
1da177e4c Linux-2.6.12-rc2 |
660 |
*/ |
1da177e4c Linux-2.6.12-rc2 |
661 662 |
*pprev = tmp; pprev = &tmp->vm_next; |
297c5eee3 mm: make the vma ... |
663 664 |
tmp->vm_prev = prev; prev = tmp; |
1da177e4c Linux-2.6.12-rc2 |
665 666 667 668 669 670 |
__vma_link_rb(mm, tmp, rb_link, rb_parent); rb_link = &tmp->vm_rb.rb_right; rb_parent = &tmp->vm_rb; mm->map_count++; |
d2cd9ede6 mm,fork: introduc... |
671 672 |
if (!(tmp->vm_flags & VM_WIPEONFORK)) retval = copy_page_range(mm, oldmm, mpnt); |
1da177e4c Linux-2.6.12-rc2 |
673 674 675 676 677 678 679 |
if (tmp->vm_ops && tmp->vm_ops->open) tmp->vm_ops->open(tmp); if (retval) goto out; } |
d6dd61c83 [PATCH] x86: PARA... |
680 |
/* a new mm has just been created */ |
ee8e8b2df arch, mm: Allow a... |
681 |
retval = arch_dup_mmap(oldmm, mm); |
1da177e4c Linux-2.6.12-rc2 |
682 |
out: |
7ee782325 [PATCH] mm: dup_m... |
683 |
up_write(&mm->mmap_sem); |
fd3e42fcc [PATCH] mm: dup_m... |
684 |
flush_tlb_mm(oldmm); |
1da177e4c Linux-2.6.12-rc2 |
685 |
up_write(&oldmm->mmap_sem); |
893e26e61 userfaultfd: non-... |
686 |
dup_userfaultfd_complete(&uf); |
7c0512679 mm, fork: make du... |
687 |
fail_uprobe_end: |
32cdba1e0 uprobes: Use perc... |
688 |
uprobe_end_dup_mmap(); |
1da177e4c Linux-2.6.12-rc2 |
689 |
return retval; |
5beb49305 mm: change anon_v... |
690 |
fail_nomem_anon_vma_fork: |
ef0855d33 mm: mempolicy: tu... |
691 |
mpol_put(vma_policy(tmp)); |
1da177e4c Linux-2.6.12-rc2 |
692 693 694 695 696 697 698 |
fail_nomem_policy: kmem_cache_free(vm_area_cachep, tmp); fail_nomem: retval = -ENOMEM; vm_unacct_memory(charge); goto out; } |
fb0a685cb kernel/fork.c: fi... |
699 |
static inline int mm_alloc_pgd(struct mm_struct *mm) |
1da177e4c Linux-2.6.12-rc2 |
700 701 702 703 704 705 |
{ mm->pgd = pgd_alloc(mm); if (unlikely(!mm->pgd)) return -ENOMEM; return 0; } |
fb0a685cb kernel/fork.c: fi... |
706 |
static inline void mm_free_pgd(struct mm_struct *mm) |
1da177e4c Linux-2.6.12-rc2 |
707 |
{ |
5e5419734 add mm argument t... |
708 |
pgd_free(mm, mm->pgd); |
1da177e4c Linux-2.6.12-rc2 |
709 710 |
} #else |
90f31d0ea mm: rcu-protected... |
711 712 713 714 715 716 717 |
static int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm) { down_write(&oldmm->mmap_sem); RCU_INIT_POINTER(mm->exe_file, get_mm_exe_file(oldmm)); up_write(&oldmm->mmap_sem); return 0; } |
1da177e4c Linux-2.6.12-rc2 |
718 719 720 |
#define mm_alloc_pgd(mm) (0) #define mm_free_pgd(mm) #endif /* CONFIG_MMU */ |
23ff44402 whitespace fixes:... |
721 |
__cacheline_aligned_in_smp DEFINE_SPINLOCK(mmlist_lock); |
1da177e4c Linux-2.6.12-rc2 |
722 |
|
e94b17660 [PATCH] slab: rem... |
723 |
#define allocate_mm() (kmem_cache_alloc(mm_cachep, GFP_KERNEL)) |
1da177e4c Linux-2.6.12-rc2 |
724 |
#define free_mm(mm) (kmem_cache_free(mm_cachep, (mm))) |
4cb0e11b1 coredump_filter: ... |
725 726 727 728 729 730 731 732 733 734 735 |
static unsigned long default_dump_filter = MMF_DUMP_FILTER_DEFAULT; static int __init coredump_filter_setup(char *s) { default_dump_filter = (simple_strtoul(s, NULL, 0) << MMF_DUMP_FILTER_SHIFT) & MMF_DUMP_FILTER_MASK; return 1; } __setup("coredump_filter=", coredump_filter_setup); |
1da177e4c Linux-2.6.12-rc2 |
736 |
#include <linux/init_task.h> |
858f09930 aio: ifdef fields... |
737 738 739 740 |
static void mm_init_aio(struct mm_struct *mm) { #ifdef CONFIG_AIO spin_lock_init(&mm->ioctx_lock); |
db446a08c aio: convert the ... |
741 |
mm->ioctx_table = NULL; |
858f09930 aio: ifdef fields... |
742 743 |
#endif } |
33144e842 kernel/fork.c: ma... |
744 745 746 747 748 749 |
static void mm_init_owner(struct mm_struct *mm, struct task_struct *p) { #ifdef CONFIG_MEMCG mm->owner = p; #endif } |
355627f51 mm, uprobes: fix ... |
750 751 752 753 754 755 |
static void mm_init_uprobes_state(struct mm_struct *mm) { #ifdef CONFIG_UPROBES mm->uprobes_state.xol_area = NULL; #endif } |
bfedb5892 mm: Add a user_ns... |
756 757 |
static struct mm_struct *mm_init(struct mm_struct *mm, struct task_struct *p, struct user_namespace *user_ns) |
1da177e4c Linux-2.6.12-rc2 |
758 |
{ |
41f727fde fork/exec: cleanu... |
759 760 761 |
mm->mmap = NULL; mm->mm_rb = RB_ROOT; mm->vmacache_seqnum = 0; |
1da177e4c Linux-2.6.12-rc2 |
762 763 764 765 |
atomic_set(&mm->mm_users, 1); atomic_set(&mm->mm_count, 1); init_rwsem(&mm->mmap_sem); INIT_LIST_HEAD(&mm->mmlist); |
999d9fc16 coredump: move mm... |
766 |
mm->core_state = NULL; |
e1f56c89b mm: convert mm->n... |
767 |
atomic_long_set(&mm->nr_ptes, 0); |
2d2f5119b mm: do not use mm... |
768 |
mm_nr_pmds_init(mm); |
41f727fde fork/exec: cleanu... |
769 770 |
mm->map_count = 0; mm->locked_vm = 0; |
ce65cefa5 fork: reset mm->p... |
771 |
mm->pinned_vm = 0; |
d559db086 mm: clean up mm_c... |
772 |
memset(&mm->rss_stat, 0, sizeof(mm->rss_stat)); |
1da177e4c Linux-2.6.12-rc2 |
773 |
spin_lock_init(&mm->page_table_lock); |
41f727fde fork/exec: cleanu... |
774 |
mm_init_cpumask(mm); |
858f09930 aio: ifdef fields... |
775 |
mm_init_aio(mm); |
cf475ad28 cgroups: add an o... |
776 |
mm_init_owner(mm, p); |
2b7e8665b fork: fix incorre... |
777 |
RCU_INIT_POINTER(mm->exe_file, NULL); |
41f727fde fork/exec: cleanu... |
778 |
mmu_notifier_mm_init(mm); |
133ff0eac mm/hmm: heterogen... |
779 |
hmm_mm_init(mm); |
16af97dc5 mm: migrate: prev... |
780 |
init_tlb_flush_pending(mm); |
41f727fde fork/exec: cleanu... |
781 782 783 |
#if defined(CONFIG_TRANSPARENT_HUGEPAGE) && !USE_SPLIT_PMD_PTLOCKS mm->pmd_huge_pte = NULL; #endif |
355627f51 mm, uprobes: fix ... |
784 |
mm_init_uprobes_state(mm); |
1da177e4c Linux-2.6.12-rc2 |
785 |
|
a0715cc22 mm, thp: add VM_I... |
786 787 788 789 790 |
if (current->mm) { mm->flags = current->mm->flags & MMF_INIT_MASK; mm->def_flags = current->mm->def_flags & VM_INIT_DEF_MASK; } else { mm->flags = default_dump_filter; |
1da177e4c Linux-2.6.12-rc2 |
791 |
mm->def_flags = 0; |
a0715cc22 mm, thp: add VM_I... |
792 |
} |
41f727fde fork/exec: cleanu... |
793 794 795 796 797 |
if (mm_alloc_pgd(mm)) goto fail_nopgd; if (init_new_context(p, mm)) goto fail_nocontext; |
78fb74669 Memory controller... |
798 |
|
bfedb5892 mm: Add a user_ns... |
799 |
mm->user_ns = get_user_ns(user_ns); |
41f727fde fork/exec: cleanu... |
800 801 802 803 804 |
return mm; fail_nocontext: mm_free_pgd(mm); fail_nopgd: |
1da177e4c Linux-2.6.12-rc2 |
805 806 807 |
free_mm(mm); return NULL; } |
c3f0327f8 mm: add rss count... |
808 809 810 811 812 813 814 815 816 817 818 819 |
static void check_mm(struct mm_struct *mm) { int i; for (i = 0; i < NR_MM_COUNTERS; i++) { long x = atomic_long_read(&mm->rss_stat.count[i]); if (unlikely(x)) printk(KERN_ALERT "BUG: Bad rss-counter state " "mm:%p idx:%d val:%ld ", mm, i, x); } |
b30fe6c7c mm: fix false-pos... |
820 821 822 823 824 825 826 827 828 |
if (atomic_long_read(&mm->nr_ptes)) pr_alert("BUG: non-zero nr_ptes on freeing mm: %ld ", atomic_long_read(&mm->nr_ptes)); if (mm_nr_pmds(mm)) pr_alert("BUG: non-zero nr_pmds on freeing mm: %ld ", mm_nr_pmds(mm)); |
e009bb30c mm: implement spl... |
829 |
#if defined(CONFIG_TRANSPARENT_HUGEPAGE) && !USE_SPLIT_PMD_PTLOCKS |
96dad67ff mm: use VM_BUG_ON... |
830 |
VM_BUG_ON_MM(mm->pmd_huge_pte, mm); |
c3f0327f8 mm: add rss count... |
831 832 |
#endif } |
1da177e4c Linux-2.6.12-rc2 |
833 834 835 |
/* * Allocate and initialize an mm_struct. */ |
fb0a685cb kernel/fork.c: fi... |
836 |
struct mm_struct *mm_alloc(void) |
1da177e4c Linux-2.6.12-rc2 |
837 |
{ |
fb0a685cb kernel/fork.c: fi... |
838 |
struct mm_struct *mm; |
1da177e4c Linux-2.6.12-rc2 |
839 840 |
mm = allocate_mm(); |
de03c72cf mm: convert mm->c... |
841 842 843 844 |
if (!mm) return NULL; memset(mm, 0, sizeof(*mm)); |
bfedb5892 mm: Add a user_ns... |
845 |
return mm_init(mm, current, current_user_ns()); |
1da177e4c Linux-2.6.12-rc2 |
846 847 848 849 850 851 852 |
} /* * Called when the last reference to the mm * is dropped: either by a lazy thread or by * mmput. Free the page directory and the mm. */ |
7ad5b3a50 kernel: remove fa... |
853 |
void __mmdrop(struct mm_struct *mm) |
1da177e4c Linux-2.6.12-rc2 |
854 855 856 857 |
{ BUG_ON(mm == &init_mm); mm_free_pgd(mm); destroy_context(mm); |
133ff0eac mm/hmm: heterogen... |
858 |
hmm_mm_destroy(mm); |
cddb8a5c1 mmu-notifiers: core |
859 |
mmu_notifier_mm_destroy(mm); |
c3f0327f8 mm: add rss count... |
860 |
check_mm(mm); |
bfedb5892 mm: Add a user_ns... |
861 |
put_user_ns(mm->user_ns); |
1da177e4c Linux-2.6.12-rc2 |
862 863 |
free_mm(mm); } |
6d4e4c4fc KVM: Disallow for... |
864 |
EXPORT_SYMBOL_GPL(__mmdrop); |
1da177e4c Linux-2.6.12-rc2 |
865 |
|
ec8d7c14e mm, oom_reaper: d... |
866 867 868 869 870 871 872 873 874 |
static inline void __mmput(struct mm_struct *mm) { VM_BUG_ON(atomic_read(&mm->mm_users)); uprobe_clear_state(mm); exit_aio(mm); ksm_exit(mm); khugepaged_exit(mm); /* must run before exit_mmap */ exit_mmap(mm); |
6fcb52a56 thp: reduce usage... |
875 |
mm_put_huge_zero_page(mm); |
ec8d7c14e mm, oom_reaper: d... |
876 877 878 879 880 881 882 883 884 885 |
set_mm_exe_file(mm, NULL); if (!list_empty(&mm->mmlist)) { spin_lock(&mmlist_lock); list_del(&mm->mmlist); spin_unlock(&mmlist_lock); } if (mm->binfmt) module_put(mm->binfmt->module); mmdrop(mm); } |
1da177e4c Linux-2.6.12-rc2 |
886 887 888 889 890 |
/* * Decrement the use count and release all resources for an mm. */ void mmput(struct mm_struct *mm) { |
0ae26f1b3 [PATCH] mmput() m... |
891 |
might_sleep(); |
ec8d7c14e mm, oom_reaper: d... |
892 893 894 895 |
if (atomic_dec_and_test(&mm->mm_users)) __mmput(mm); } EXPORT_SYMBOL_GPL(mmput); |
a1b2289ce android: binder: ... |
896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 |
#ifdef CONFIG_MMU static void mmput_async_fn(struct work_struct *work) { struct mm_struct *mm = container_of(work, struct mm_struct, async_put_work); __mmput(mm); } void mmput_async(struct mm_struct *mm) { if (atomic_dec_and_test(&mm->mm_users)) { INIT_WORK(&mm->async_put_work, mmput_async_fn); schedule_work(&mm->async_put_work); } } #endif |
90f31d0ea mm: rcu-protected... |
913 914 915 916 917 |
/** * set_mm_exe_file - change a reference to the mm's executable file * * This changes mm's executable file (shown as symlink /proc/[pid]/exe). * |
6e399cd14 prctl: avoid usin... |
918 919 920 921 922 |
* Main users are mmput() and sys_execve(). Callers prevent concurrent * invocations: in mmput() nobody alive left, in execve task is single * threaded. sys_prctl(PR_SET_MM_MAP/EXE_FILE) also needs to set the * mm->exe_file, but does so without using set_mm_exe_file() in order * to do avoid the need for any locks. |
90f31d0ea mm: rcu-protected... |
923 |
*/ |
386460138 mm: extract exe_f... |
924 925 |
void set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file) { |
6e399cd14 prctl: avoid usin... |
926 927 928 929 930 931 932 933 |
struct file *old_exe_file; /* * It is safe to dereference the exe_file without RCU as * this function is only called if nobody else can access * this mm -- see comment above for justification. */ old_exe_file = rcu_dereference_raw(mm->exe_file); |
90f31d0ea mm: rcu-protected... |
934 |
|
386460138 mm: extract exe_f... |
935 936 |
if (new_exe_file) get_file(new_exe_file); |
90f31d0ea mm: rcu-protected... |
937 938 939 |
rcu_assign_pointer(mm->exe_file, new_exe_file); if (old_exe_file) fput(old_exe_file); |
386460138 mm: extract exe_f... |
940 |
} |
90f31d0ea mm: rcu-protected... |
941 942 943 944 945 946 |
/** * get_mm_exe_file - acquire a reference to the mm's executable file * * Returns %NULL if mm has no associated executable file. * User must release file via fput(). */ |
386460138 mm: extract exe_f... |
947 948 949 |
struct file *get_mm_exe_file(struct mm_struct *mm) { struct file *exe_file; |
90f31d0ea mm: rcu-protected... |
950 951 952 953 954 |
rcu_read_lock(); exe_file = rcu_dereference(mm->exe_file); if (exe_file && !get_file_rcu(exe_file)) exe_file = NULL; rcu_read_unlock(); |
386460138 mm: extract exe_f... |
955 956 |
return exe_file; } |
11163348a oprofile: reduce ... |
957 |
EXPORT_SYMBOL(get_mm_exe_file); |
386460138 mm: extract exe_f... |
958 |
|
1da177e4c Linux-2.6.12-rc2 |
959 |
/** |
cd81a9170 mm: introduce get... |
960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 |
* get_task_exe_file - acquire a reference to the task's executable file * * Returns %NULL if task's mm (if any) has no associated executable file or * this is a kernel thread with borrowed mm (see the comment above get_task_mm). * User must release file via fput(). */ struct file *get_task_exe_file(struct task_struct *task) { struct file *exe_file = NULL; struct mm_struct *mm; task_lock(task); mm = task->mm; if (mm) { if (!(task->flags & PF_KTHREAD)) exe_file = get_mm_exe_file(mm); } task_unlock(task); return exe_file; } EXPORT_SYMBOL(get_task_exe_file); |
386460138 mm: extract exe_f... |
981 |
|
1da177e4c Linux-2.6.12-rc2 |
982 983 984 |
/** * get_task_mm - acquire a reference to the task's mm * |
246bb0b1d kill PF_BORROWED_... |
985 |
* Returns %NULL if the task has no mm. Checks PF_KTHREAD (meaning |
1da177e4c Linux-2.6.12-rc2 |
986 987 988 989 990 991 992 993 994 995 996 997 |
* this kernel workthread has transiently adopted a user mm with use_mm, * to do its AIO) is not set and if so returns a reference to it, after * bumping up the use count. User must release the mm via mmput() * after use. Typically used by /proc and ptrace. */ struct mm_struct *get_task_mm(struct task_struct *task) { struct mm_struct *mm; task_lock(task); mm = task->mm; if (mm) { |
246bb0b1d kill PF_BORROWED_... |
998 |
if (task->flags & PF_KTHREAD) |
1da177e4c Linux-2.6.12-rc2 |
999 1000 |
mm = NULL; else |
3fce371bf mm: add new mmget... |
1001 |
mmget(mm); |
1da177e4c Linux-2.6.12-rc2 |
1002 1003 1004 1005 1006 |
} task_unlock(task); return mm; } EXPORT_SYMBOL_GPL(get_task_mm); |
8cdb878dc Fix race in proce... |
1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 |
struct mm_struct *mm_access(struct task_struct *task, unsigned int mode) { struct mm_struct *mm; int err; err = mutex_lock_killable(&task->signal->cred_guard_mutex); if (err) return ERR_PTR(err); mm = get_task_mm(task); if (mm && mm != current->mm && !ptrace_may_access(task, mode)) { mmput(mm); mm = ERR_PTR(-EACCES); } mutex_unlock(&task->signal->cred_guard_mutex); return mm; } |
57b59c4a1 coredump_wait: do... |
1026 |
static void complete_vfork_done(struct task_struct *tsk) |
c415c3b47 vfork: introduce ... |
1027 |
{ |
d68b46fe1 vfork: make it ki... |
1028 |
struct completion *vfork; |
c415c3b47 vfork: introduce ... |
1029 |
|
d68b46fe1 vfork: make it ki... |
1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 |
task_lock(tsk); vfork = tsk->vfork_done; if (likely(vfork)) { tsk->vfork_done = NULL; complete(vfork); } task_unlock(tsk); } static int wait_for_vfork_done(struct task_struct *child, struct completion *vfork) { int killed; freezer_do_not_count(); killed = wait_for_completion_killable(vfork); freezer_count(); if (killed) { task_lock(child); child->vfork_done = NULL; task_unlock(child); } put_task_struct(child); return killed; |
c415c3b47 vfork: introduce ... |
1056 |
} |
1da177e4c Linux-2.6.12-rc2 |
1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 |
/* Please note the differences between mmput and mm_release. * mmput is called whenever we stop holding onto a mm_struct, * error success whatever. * * mm_release is called after a mm_struct has been removed * from the current process. * * This difference is important for error handling, when we * only half set up a mm_struct for a new process and need to restore * the old one. Because we mmput the new mm_struct before * restoring the old one. . . * Eric Biederman 10 January 1998 */ void mm_release(struct task_struct *tsk, struct mm_struct *mm) { |
8141c7f3e Move "exit_robust... |
1072 1073 |
/* Get rid of any futexes when releasing the mm */ #ifdef CONFIG_FUTEX |
fc6b177de futex: Nullify ro... |
1074 |
if (unlikely(tsk->robust_list)) { |
8141c7f3e Move "exit_robust... |
1075 |
exit_robust_list(tsk); |
fc6b177de futex: Nullify ro... |
1076 1077 |
tsk->robust_list = NULL; } |
8141c7f3e Move "exit_robust... |
1078 |
#ifdef CONFIG_COMPAT |
fc6b177de futex: Nullify ro... |
1079 |
if (unlikely(tsk->compat_robust_list)) { |
8141c7f3e Move "exit_robust... |
1080 |
compat_exit_robust_list(tsk); |
fc6b177de futex: Nullify ro... |
1081 1082 |
tsk->compat_robust_list = NULL; } |
8141c7f3e Move "exit_robust... |
1083 |
#endif |
322a2c100 futex: Move exit_... |
1084 1085 |
if (unlikely(!list_empty(&tsk->pi_state_list))) exit_pi_state_list(tsk); |
8141c7f3e Move "exit_robust... |
1086 |
#endif |
0326f5a94 uprobes/core: Han... |
1087 |
uprobe_free_utask(tsk); |
1da177e4c Linux-2.6.12-rc2 |
1088 1089 |
/* Get rid of any cached register state */ deactivate_mm(tsk, mm); |
fec1d0115 [PATCH] Disable C... |
1090 |
/* |
735f2770a kernel/fork: fix ... |
1091 1092 1093 |
* Signal userspace if we're not exiting with a core dump * because we want to leave the value intact for debugging * purposes. |
fec1d0115 [PATCH] Disable C... |
1094 |
*/ |
9c8a8228d execve: must clea... |
1095 |
if (tsk->clear_child_tid) { |
735f2770a kernel/fork: fix ... |
1096 |
if (!(tsk->signal->flags & SIGNAL_GROUP_COREDUMP) && |
9c8a8228d execve: must clea... |
1097 1098 1099 1100 1101 1102 1103 1104 1105 |
atomic_read(&mm->mm_users) > 1) { /* * We don't check the error code - if userspace has * not set up a proper pointer then tough luck. */ put_user(0, tsk->clear_child_tid); sys_futex(tsk->clear_child_tid, FUTEX_WAKE, 1, NULL, NULL, 0); } |
1da177e4c Linux-2.6.12-rc2 |
1106 |
tsk->clear_child_tid = NULL; |
1da177e4c Linux-2.6.12-rc2 |
1107 |
} |
f7505d64f fork: call comple... |
1108 1109 1110 1111 1112 1113 1114 |
/* * All done, finally we can wake up parent and return this mm to him. * Also kthread_stop() uses this completion for synchronization. */ if (tsk->vfork_done) complete_vfork_done(tsk); |
1da177e4c Linux-2.6.12-rc2 |
1115 |
} |
a0a7ec308 [PATCH] unshare s... |
1116 1117 1118 1119 |
/* * Allocate a new mm structure and copy contents from the * mm structure of the passed in task structure. */ |
ff252c1fc kernel/fork.c: ma... |
1120 |
static struct mm_struct *dup_mm(struct task_struct *tsk) |
a0a7ec308 [PATCH] unshare s... |
1121 1122 1123 |
{ struct mm_struct *mm, *oldmm = current->mm; int err; |
a0a7ec308 [PATCH] unshare s... |
1124 1125 1126 1127 1128 |
mm = allocate_mm(); if (!mm) goto fail_nomem; memcpy(mm, oldmm, sizeof(*mm)); |
bfedb5892 mm: Add a user_ns... |
1129 |
if (!mm_init(mm, tsk, mm->user_ns)) |
a0a7ec308 [PATCH] unshare s... |
1130 |
goto fail_nomem; |
a0a7ec308 [PATCH] unshare s... |
1131 1132 1133 1134 1135 1136 |
err = dup_mmap(mm, oldmm); if (err) goto free_pt; mm->hiwater_rss = get_mm_rss(mm); mm->hiwater_vm = mm->total_vm; |
801460d0c task_struct clean... |
1137 1138 |
if (mm->binfmt && !try_module_get(mm->binfmt->module)) goto free_pt; |
a0a7ec308 [PATCH] unshare s... |
1139 1140 1141 |
return mm; free_pt: |
801460d0c task_struct clean... |
1142 1143 |
/* don't put binfmt in mmput, we haven't got module yet */ mm->binfmt = NULL; |
a0a7ec308 [PATCH] unshare s... |
1144 1145 1146 1147 |
mmput(mm); fail_nomem: return NULL; |
a0a7ec308 [PATCH] unshare s... |
1148 |
} |
fb0a685cb kernel/fork.c: fi... |
1149 |
static int copy_mm(unsigned long clone_flags, struct task_struct *tsk) |
1da177e4c Linux-2.6.12-rc2 |
1150 |
{ |
fb0a685cb kernel/fork.c: fi... |
1151 |
struct mm_struct *mm, *oldmm; |
1da177e4c Linux-2.6.12-rc2 |
1152 1153 1154 1155 |
int retval; tsk->min_flt = tsk->maj_flt = 0; tsk->nvcsw = tsk->nivcsw = 0; |
17406b82d softlockup: remov... |
1156 1157 1158 |
#ifdef CONFIG_DETECT_HUNG_TASK tsk->last_switch_count = tsk->nvcsw + tsk->nivcsw; #endif |
1da177e4c Linux-2.6.12-rc2 |
1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 |
tsk->mm = NULL; tsk->active_mm = NULL; /* * Are we cloning a kernel thread? * * We need to steal a active VM for that.. */ oldmm = current->mm; if (!oldmm) return 0; |
615d6e875 mm: per-thread vm... |
1171 1172 |
/* initialize the new vmacache entries */ vmacache_flush(tsk); |
1da177e4c Linux-2.6.12-rc2 |
1173 |
if (clone_flags & CLONE_VM) { |
3fce371bf mm: add new mmget... |
1174 |
mmget(oldmm); |
1da177e4c Linux-2.6.12-rc2 |
1175 |
mm = oldmm; |
1da177e4c Linux-2.6.12-rc2 |
1176 1177 1178 1179 |
goto good_mm; } retval = -ENOMEM; |
a0a7ec308 [PATCH] unshare s... |
1180 |
mm = dup_mm(tsk); |
1da177e4c Linux-2.6.12-rc2 |
1181 1182 |
if (!mm) goto fail_nomem; |
1da177e4c Linux-2.6.12-rc2 |
1183 1184 1185 1186 |
good_mm: tsk->mm = mm; tsk->active_mm = mm; return 0; |
1da177e4c Linux-2.6.12-rc2 |
1187 1188 |
fail_nomem: return retval; |
1da177e4c Linux-2.6.12-rc2 |
1189 |
} |
a39bc5169 Uninline fork.c/e... |
1190 |
static int copy_fs(unsigned long clone_flags, struct task_struct *tsk) |
1da177e4c Linux-2.6.12-rc2 |
1191 |
{ |
498052bba New locking/refco... |
1192 |
struct fs_struct *fs = current->fs; |
1da177e4c Linux-2.6.12-rc2 |
1193 |
if (clone_flags & CLONE_FS) { |
498052bba New locking/refco... |
1194 |
/* tsk->fs is already what we want */ |
2a4419b5b fs: fs_struct rwl... |
1195 |
spin_lock(&fs->lock); |
498052bba New locking/refco... |
1196 |
if (fs->in_exec) { |
2a4419b5b fs: fs_struct rwl... |
1197 |
spin_unlock(&fs->lock); |
498052bba New locking/refco... |
1198 1199 1200 |
return -EAGAIN; } fs->users++; |
2a4419b5b fs: fs_struct rwl... |
1201 |
spin_unlock(&fs->lock); |
1da177e4c Linux-2.6.12-rc2 |
1202 1203 |
return 0; } |
498052bba New locking/refco... |
1204 |
tsk->fs = copy_fs_struct(fs); |
1da177e4c Linux-2.6.12-rc2 |
1205 1206 1207 1208 |
if (!tsk->fs) return -ENOMEM; return 0; } |
fb0a685cb kernel/fork.c: fi... |
1209 |
static int copy_files(unsigned long clone_flags, struct task_struct *tsk) |
a016f3389 [PATCH] unshare s... |
1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 |
{ struct files_struct *oldf, *newf; int error = 0; /* * A background process may not have any files ... */ oldf = current->files; if (!oldf) goto out; if (clone_flags & CLONE_FILES) { atomic_inc(&oldf->count); goto out; } |
a016f3389 [PATCH] unshare s... |
1225 1226 1227 1228 1229 1230 1231 1232 1233 |
newf = dup_fd(oldf, &error); if (!newf) goto out; tsk->files = newf; error = 0; out: return error; } |
fadad878c kernel: add CLONE... |
1234 |
static int copy_io(unsigned long clone_flags, struct task_struct *tsk) |
fd0928df9 ioprio: move io p... |
1235 1236 1237 |
{ #ifdef CONFIG_BLOCK struct io_context *ioc = current->io_context; |
6e736be7f block: make ioc g... |
1238 |
struct io_context *new_ioc; |
fd0928df9 ioprio: move io p... |
1239 1240 1241 |
if (!ioc) return 0; |
fadad878c kernel: add CLONE... |
1242 1243 1244 1245 |
/* * Share io context with parent, if CLONE_IO is set */ if (clone_flags & CLONE_IO) { |
3d48749d9 block: ioc_task_l... |
1246 1247 |
ioc_task_link(ioc); tsk->io_context = ioc; |
fadad878c kernel: add CLONE... |
1248 |
} else if (ioprio_valid(ioc->ioprio)) { |
6e736be7f block: make ioc g... |
1249 1250 |
new_ioc = get_task_io_context(tsk, GFP_KERNEL, NUMA_NO_NODE); if (unlikely(!new_ioc)) |
fd0928df9 ioprio: move io p... |
1251 |
return -ENOMEM; |
6e736be7f block: make ioc g... |
1252 |
new_ioc->ioprio = ioc->ioprio; |
11a3122f6 block: strip out ... |
1253 |
put_io_context(new_ioc); |
fd0928df9 ioprio: move io p... |
1254 1255 1256 1257 |
} #endif return 0; } |
a39bc5169 Uninline fork.c/e... |
1258 |
static int copy_sighand(unsigned long clone_flags, struct task_struct *tsk) |
1da177e4c Linux-2.6.12-rc2 |
1259 1260 |
{ struct sighand_struct *sig; |
60348802e fork.c: cleanup f... |
1261 |
if (clone_flags & CLONE_SIGHAND) { |
1da177e4c Linux-2.6.12-rc2 |
1262 1263 1264 1265 |
atomic_inc(¤t->sighand->count); return 0; } sig = kmem_cache_alloc(sighand_cachep, GFP_KERNEL); |
e56d09031 [PATCH] RCU signa... |
1266 |
rcu_assign_pointer(tsk->sighand, sig); |
1da177e4c Linux-2.6.12-rc2 |
1267 1268 |
if (!sig) return -ENOMEM; |
9d7fb0427 sched/cputime: Gu... |
1269 |
|
1da177e4c Linux-2.6.12-rc2 |
1270 |
atomic_set(&sig->count, 1); |
f552f8c28 fork: don't copy ... |
1271 |
spin_lock_irq(¤t->sighand->siglock); |
1da177e4c Linux-2.6.12-rc2 |
1272 |
memcpy(sig->action, current->sighand->action, sizeof(sig->action)); |
f552f8c28 fork: don't copy ... |
1273 |
spin_unlock_irq(¤t->sighand->siglock); |
1da177e4c Linux-2.6.12-rc2 |
1274 1275 |
return 0; } |
a7e5328a0 [PATCH] cleanup _... |
1276 |
void __cleanup_sighand(struct sighand_struct *sighand) |
c81addc9d [PATCH] rename __... |
1277 |
{ |
d80e731ec epoll: introduce ... |
1278 1279 |
if (atomic_dec_and_test(&sighand->count)) { signalfd_cleanup(sighand); |
392809b25 signal: Document ... |
1280 |
/* |
5f0d5a3ae mm: Rename SLAB_D... |
1281 |
* sighand_cachep is SLAB_TYPESAFE_BY_RCU so we can free it |
392809b25 signal: Document ... |
1282 1283 |
* without an RCU grace period, see __lock_task_sighand(). */ |
c81addc9d [PATCH] rename __... |
1284 |
kmem_cache_free(sighand_cachep, sighand); |
d80e731ec epoll: introduce ... |
1285 |
} |
c81addc9d [PATCH] rename __... |
1286 |
} |
b18b6a9ce timers: Omit POSI... |
1287 |
#ifdef CONFIG_POSIX_TIMERS |
f06febc96 timers: fix itime... |
1288 1289 1290 1291 1292 |
/* * Initialize POSIX timer handling for a thread group. */ static void posix_cpu_timers_init_group(struct signal_struct *sig) { |
78d7d407b kernel core: use ... |
1293 |
unsigned long cpu_limit; |
316c1608d sched, timer: Con... |
1294 |
cpu_limit = READ_ONCE(sig->rlim[RLIMIT_CPU].rlim_cur); |
78d7d407b kernel core: use ... |
1295 |
if (cpu_limit != RLIM_INFINITY) { |
ebd7e7fc4 timers/posix-time... |
1296 |
sig->cputime_expires.prof_exp = cpu_limit * NSEC_PER_SEC; |
d5c373eb5 posix_cpu_timer: ... |
1297 |
sig->cputimer.running = true; |
6279a751f posix-timers: fix... |
1298 |
} |
f06febc96 timers: fix itime... |
1299 1300 1301 1302 1303 |
/* The timer lists. */ INIT_LIST_HEAD(&sig->cpu_timers[0]); INIT_LIST_HEAD(&sig->cpu_timers[1]); INIT_LIST_HEAD(&sig->cpu_timers[2]); } |
b18b6a9ce timers: Omit POSI... |
1304 1305 1306 |
#else static inline void posix_cpu_timers_init_group(struct signal_struct *sig) { } #endif |
f06febc96 timers: fix itime... |
1307 |
|
a39bc5169 Uninline fork.c/e... |
1308 |
static int copy_signal(unsigned long clone_flags, struct task_struct *tsk) |
1da177e4c Linux-2.6.12-rc2 |
1309 1310 |
{ struct signal_struct *sig; |
1da177e4c Linux-2.6.12-rc2 |
1311 |
|
4ab6c0833 clone(): fix race... |
1312 |
if (clone_flags & CLONE_THREAD) |
490dea45d itimers: remove t... |
1313 |
return 0; |
490dea45d itimers: remove t... |
1314 |
|
a56704ef6 copy_signal() cle... |
1315 |
sig = kmem_cache_zalloc(signal_cachep, GFP_KERNEL); |
1da177e4c Linux-2.6.12-rc2 |
1316 1317 1318 |
tsk->signal = sig; if (!sig) return -ENOMEM; |
b3ac022cb proc: turn signal... |
1319 |
sig->nr_threads = 1; |
1da177e4c Linux-2.6.12-rc2 |
1320 |
atomic_set(&sig->live, 1); |
b3ac022cb proc: turn signal... |
1321 |
atomic_set(&sig->sigcnt, 1); |
0c740d0af introduce for_eac... |
1322 1323 1324 1325 |
/* list_add(thread_node, thread_head) without INIT_LIST_HEAD() */ sig->thread_head = (struct list_head)LIST_HEAD_INIT(tsk->thread_node); tsk->thread_node = (struct list_head)LIST_HEAD_INIT(sig->thread_head); |
1da177e4c Linux-2.6.12-rc2 |
1326 |
init_waitqueue_head(&sig->wait_chldexit); |
db51aeccd signals: microopt... |
1327 |
sig->curr_target = tsk; |
1da177e4c Linux-2.6.12-rc2 |
1328 |
init_sigpending(&sig->shared_pending); |
e78c34967 time, signal: Pro... |
1329 |
seqlock_init(&sig->stats_lock); |
9d7fb0427 sched/cputime: Gu... |
1330 |
prev_cputime_init(&sig->prev_cputime); |
1da177e4c Linux-2.6.12-rc2 |
1331 |
|
baa73d9e4 posix-timers: Mak... |
1332 |
#ifdef CONFIG_POSIX_TIMERS |
b18b6a9ce timers: Omit POSI... |
1333 |
INIT_LIST_HEAD(&sig->posix_timers); |
c9cb2e3d7 [PATCH] hrtimers:... |
1334 |
hrtimer_init(&sig->real_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
1da177e4c Linux-2.6.12-rc2 |
1335 |
sig->real_timer.function = it_real_fn; |
baa73d9e4 posix-timers: Mak... |
1336 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
1337 |
|
1da177e4c Linux-2.6.12-rc2 |
1338 1339 1340 |
task_lock(current->group_leader); memcpy(sig->rlim, current->signal->rlim, sizeof sig->rlim); task_unlock(current->group_leader); |
6279a751f posix-timers: fix... |
1341 |
posix_cpu_timers_init_group(sig); |
522ed7767 Audit: add TTY in... |
1342 |
tty_audit_fork(sig); |
5091faa44 sched: Add 'autog... |
1343 |
sched_autogroup_fork(sig); |
522ed7767 Audit: add TTY in... |
1344 |
|
a63d83f42 oom: badness heur... |
1345 |
sig->oom_score_adj = current->signal->oom_score_adj; |
dabb16f63 oom: allow a non-... |
1346 |
sig->oom_score_adj_min = current->signal->oom_score_adj_min; |
28b83c519 oom: move oom_adj... |
1347 |
|
9b1bf12d5 signals: move cre... |
1348 |
mutex_init(&sig->cred_guard_mutex); |
1da177e4c Linux-2.6.12-rc2 |
1349 1350 |
return 0; } |
dbd952127 seccomp: introduc... |
1351 1352 1353 1354 1355 1356 1357 1358 1359 |
static void copy_seccomp(struct task_struct *p) { #ifdef CONFIG_SECCOMP /* * Must be called with sighand->lock held, which is common to * all threads in the group. Holding cred_guard_mutex is not * needed because this new task is not yet running and cannot * be racing exec. */ |
69f6a34bd seccomp: Replace ... |
1360 |
assert_spin_locked(¤t->sighand->siglock); |
dbd952127 seccomp: introduc... |
1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 |
/* Ref-count the new filter user, and assign it. */ get_seccomp_filter(current); p->seccomp = current->seccomp; /* * Explicitly enable no_new_privs here in case it got set * between the task_struct being duplicated and holding the * sighand lock. The seccomp state and nnp must be in sync. */ if (task_no_new_privs(current)) task_set_no_new_privs(p); /* * If the parent gained a seccomp mode after copying thread * flags and between before we held the sighand lock, we have * to manually enable the seccomp thread flag here. */ if (p->seccomp.mode != SECCOMP_MODE_DISABLED) set_tsk_thread_flag(p, TIF_SECCOMP); #endif } |
17da2bd90 [CVE-2009-0029] S... |
1383 |
SYSCALL_DEFINE1(set_tid_address, int __user *, tidptr) |
1da177e4c Linux-2.6.12-rc2 |
1384 1385 |
{ current->clear_child_tid = tidptr; |
b488893a3 pid namespaces: c... |
1386 |
return task_pid_vnr(current); |
1da177e4c Linux-2.6.12-rc2 |
1387 |
} |
a39bc5169 Uninline fork.c/e... |
1388 |
static void rt_mutex_init_task(struct task_struct *p) |
23f78d4a0 [PATCH] pi-futex:... |
1389 |
{ |
1d6154825 sched: Convert pi... |
1390 |
raw_spin_lock_init(&p->pi_lock); |
e29e175b0 [PATCH] initialis... |
1391 |
#ifdef CONFIG_RT_MUTEXES |
a23ba907d locking/rtmutex: ... |
1392 |
p->pi_waiters = RB_ROOT_CACHED; |
e96a7705e sched/rtmutex/dea... |
1393 |
p->pi_top_task = NULL; |
23f78d4a0 [PATCH] pi-futex:... |
1394 |
p->pi_blocked_on = NULL; |
23f78d4a0 [PATCH] pi-futex:... |
1395 1396 |
#endif } |
b18b6a9ce timers: Omit POSI... |
1397 |
#ifdef CONFIG_POSIX_TIMERS |
1da177e4c Linux-2.6.12-rc2 |
1398 |
/* |
f06febc96 timers: fix itime... |
1399 1400 1401 1402 |
* Initialize POSIX timer handling for a single task. */ static void posix_cpu_timers_init(struct task_struct *tsk) { |
648616343 [S390] cputime: a... |
1403 1404 |
tsk->cputime_expires.prof_exp = 0; tsk->cputime_expires.virt_exp = 0; |
f06febc96 timers: fix itime... |
1405 1406 1407 1408 1409 |
tsk->cputime_expires.sched_exp = 0; INIT_LIST_HEAD(&tsk->cpu_timers[0]); INIT_LIST_HEAD(&tsk->cpu_timers[1]); INIT_LIST_HEAD(&tsk->cpu_timers[2]); } |
b18b6a9ce timers: Omit POSI... |
1410 1411 1412 |
#else static inline void posix_cpu_timers_init(struct task_struct *tsk) { } #endif |
f06febc96 timers: fix itime... |
1413 |
|
819077398 kernel/fork.c:cop... |
1414 1415 1416 1417 1418 |
static inline void init_task_pid(struct task_struct *task, enum pid_type type, struct pid *pid) { task->pids[type].pid = pid; } |
6bfbaa51e sched/headers, RC... |
1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 |
static inline void rcu_copy_process(struct task_struct *p) { #ifdef CONFIG_PREEMPT_RCU p->rcu_read_lock_nesting = 0; p->rcu_read_unlock_special.s = 0; p->rcu_blocked_node = NULL; INIT_LIST_HEAD(&p->rcu_node_entry); #endif /* #ifdef CONFIG_PREEMPT_RCU */ #ifdef CONFIG_TASKS_RCU p->rcu_tasks_holdout = false; INIT_LIST_HEAD(&p->rcu_tasks_holdout_list); p->rcu_tasks_idle_cpu = -1; #endif /* #ifdef CONFIG_TASKS_RCU */ } |
f06febc96 timers: fix itime... |
1433 |
/* |
1da177e4c Linux-2.6.12-rc2 |
1434 1435 1436 1437 1438 1439 1440 |
* This creates a new process as a copy of the old one, * but does not actually start it yet. * * It copies the registers, and all the appropriate * parts of the process environment (as per the clone * flags). The actual kick-off is left to the caller. */ |
0766f788e latent_entropy: M... |
1441 1442 |
static __latent_entropy struct task_struct *copy_process( unsigned long clone_flags, |
36c8b5868 [PATCH] sched: cl... |
1443 |
unsigned long stack_start, |
36c8b5868 [PATCH] sched: cl... |
1444 |
unsigned long stack_size, |
36c8b5868 [PATCH] sched: cl... |
1445 |
int __user *child_tidptr, |
09a05394f tracehook: clone |
1446 |
struct pid *pid, |
3033f14ab clone: support pa... |
1447 |
int trace, |
725fc629f kernek/fork.c: al... |
1448 1449 |
unsigned long tls, int node) |
1da177e4c Linux-2.6.12-rc2 |
1450 1451 |
{ int retval; |
a24efe62d kernel/fork.c: re... |
1452 |
struct task_struct *p; |
1da177e4c Linux-2.6.12-rc2 |
1453 1454 1455 |
if ((clone_flags & (CLONE_NEWNS|CLONE_FS)) == (CLONE_NEWNS|CLONE_FS)) return ERR_PTR(-EINVAL); |
e66eded83 userns: Don't all... |
1456 1457 |
if ((clone_flags & (CLONE_NEWUSER|CLONE_FS)) == (CLONE_NEWUSER|CLONE_FS)) return ERR_PTR(-EINVAL); |
1da177e4c Linux-2.6.12-rc2 |
1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 |
/* * Thread groups must share signals as well, and detached threads * can only be started up within the thread group. */ if ((clone_flags & CLONE_THREAD) && !(clone_flags & CLONE_SIGHAND)) return ERR_PTR(-EINVAL); /* * Shared signal handlers imply shared VM. By way of the above, * thread groups also imply shared VM. Blocking this case allows * for various simplifications in other code. */ if ((clone_flags & CLONE_SIGHAND) && !(clone_flags & CLONE_VM)) return ERR_PTR(-EINVAL); |
123be07b0 fork(): disable C... |
1472 1473 1474 1475 1476 1477 1478 1479 1480 |
/* * Siblings of global init remain as zombies on exit since they are * not reaped by their parent (swapper). To solve this and to avoid * multi-rooted process trees, prevent global and container-inits * from creating siblings. */ if ((clone_flags & CLONE_PARENT) && current->signal->flags & SIGNAL_UNKILLABLE) return ERR_PTR(-EINVAL); |
8382fcac1 pidns: Outlaw thr... |
1481 |
/* |
40a0d32d1 fork: unify and t... |
1482 |
* If the new process will be in a different pid or user namespace |
faf00da54 userns,pidns: For... |
1483 |
* do not allow it to share a thread group with the forking task. |
8382fcac1 pidns: Outlaw thr... |
1484 |
*/ |
faf00da54 userns,pidns: For... |
1485 |
if (clone_flags & CLONE_THREAD) { |
40a0d32d1 fork: unify and t... |
1486 1487 1488 1489 1490 |
if ((clone_flags & (CLONE_NEWUSER | CLONE_NEWPID)) || (task_active_pid_ns(current) != current->nsproxy->pid_ns_for_children)) return ERR_PTR(-EINVAL); } |
8382fcac1 pidns: Outlaw thr... |
1491 |
|
1da177e4c Linux-2.6.12-rc2 |
1492 |
retval = -ENOMEM; |
725fc629f kernek/fork.c: al... |
1493 |
p = dup_task_struct(current, node); |
1da177e4c Linux-2.6.12-rc2 |
1494 1495 |
if (!p) goto fork_out; |
4d6501dce kthread: Fix use-... |
1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 |
/* * This _must_ happen before we call free_task(), i.e. before we jump * to any of the bad_fork_* labels. This is to avoid freeing * p->set_child_tid which is (ab)used as a kthread's data pointer for * kernel threads (PF_KTHREAD). */ p->set_child_tid = (clone_flags & CLONE_CHILD_SETTID) ? child_tidptr : NULL; /* * Clear TID on mm_release()? */ p->clear_child_tid = (clone_flags & CLONE_CHILD_CLEARTID) ? child_tidptr : NULL; |
f7e8b616e function-graph: m... |
1507 |
ftrace_graph_init_task(p); |
bea493a03 [PATCH] rt-mutex:... |
1508 |
rt_mutex_init_task(p); |
d12c1a379 lockdep: fix kern... |
1509 |
#ifdef CONFIG_PROVE_LOCKING |
de30a2b35 [PATCH] lockdep: ... |
1510 1511 1512 |
DEBUG_LOCKS_WARN_ON(!p->hardirqs_enabled); DEBUG_LOCKS_WARN_ON(!p->softirqs_enabled); #endif |
1da177e4c Linux-2.6.12-rc2 |
1513 |
retval = -EAGAIN; |
3b11a1dec CRED: Differentia... |
1514 |
if (atomic_read(&p->real_cred->user->processes) >= |
78d7d407b kernel core: use ... |
1515 |
task_rlimit(p, RLIMIT_NPROC)) { |
b57922b6c fork: reorder per... |
1516 1517 |
if (p->real_cred->user != INIT_USER && !capable(CAP_SYS_RESOURCE) && !capable(CAP_SYS_ADMIN)) |
1da177e4c Linux-2.6.12-rc2 |
1518 1519 |
goto bad_fork_free; } |
72fa59970 move RLIMIT_NPROC... |
1520 |
current->flags &= ~PF_NPROC_EXCEEDED; |
1da177e4c Linux-2.6.12-rc2 |
1521 |
|
f1752eec6 CRED: Detach the ... |
1522 1523 1524 |
retval = copy_creds(p, clone_flags); if (retval < 0) goto bad_fork_free; |
1da177e4c Linux-2.6.12-rc2 |
1525 1526 1527 1528 1529 1530 |
/* * If multiple threads are within copy_process(), then this check * triggers too late. This doesn't hurt, the check is only there * to stop root fork bombs. */ |
04ec93fe9 fork.c: fix NULL ... |
1531 |
retval = -EAGAIN; |
1da177e4c Linux-2.6.12-rc2 |
1532 1533 |
if (nr_threads >= max_threads) goto bad_fork_cleanup_count; |
ca74e92b4 [PATCH] per-task-... |
1534 |
delayacct_tsk_init(p); /* Must remain after dup_task_struct() */ |
c1de45ca8 sched/idle: Add s... |
1535 |
p->flags &= ~(PF_SUPERPRIV | PF_WQ_WORKER | PF_IDLE); |
514ddb446 fork: collapse co... |
1536 |
p->flags |= PF_FORKNOEXEC; |
1da177e4c Linux-2.6.12-rc2 |
1537 1538 |
INIT_LIST_HEAD(&p->children); INIT_LIST_HEAD(&p->sibling); |
f41d911f8 rcu: Merge preemp... |
1539 |
rcu_copy_process(p); |
1da177e4c Linux-2.6.12-rc2 |
1540 1541 |
p->vfork_done = NULL; spin_lock_init(&p->alloc_lock); |
1da177e4c Linux-2.6.12-rc2 |
1542 |
|
1da177e4c Linux-2.6.12-rc2 |
1543 |
init_sigpending(&p->pending); |
648616343 [S390] cputime: a... |
1544 |
p->utime = p->stime = p->gtime = 0; |
40565b5ae sched/cputime, po... |
1545 |
#ifdef CONFIG_ARCH_HAS_SCALED_CPUTIME |
648616343 [S390] cputime: a... |
1546 |
p->utimescaled = p->stimescaled = 0; |
40565b5ae sched/cputime, po... |
1547 |
#endif |
9d7fb0427 sched/cputime: Gu... |
1548 |
prev_cputime_init(&p->prev_cputime); |
6a61671bb cputime: Safely r... |
1549 |
#ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN |
bac5b6b6b sched/cputime: Mo... |
1550 1551 1552 |
seqcount_init(&p->vtime.seqcount); p->vtime.starttime = 0; p->vtime.state = VTIME_INACTIVE; |
6a61671bb cputime: Safely r... |
1553 |
#endif |
a3a2e76c7 mm: avoid null-po... |
1554 1555 1556 |
#if defined(SPLIT_RSS_COUNTING) memset(&p->rss_stat, 0, sizeof(p->rss_stat)); #endif |
172ba844a sched: update del... |
1557 |
|
6976675d9 hrtimer: create a... |
1558 |
p->default_timer_slack_ns = current->timer_slack_ns; |
5995477ab task IO accountin... |
1559 |
task_io_accounting_init(&p->ioac); |
1da177e4c Linux-2.6.12-rc2 |
1560 |
acct_clear_integrals(p); |
f06febc96 timers: fix itime... |
1561 |
posix_cpu_timers_init(p); |
1da177e4c Linux-2.6.12-rc2 |
1562 |
|
1da177e4c Linux-2.6.12-rc2 |
1563 |
p->io_context = NULL; |
1da177e4c Linux-2.6.12-rc2 |
1564 |
p->audit_context = NULL; |
b4f48b636 Task Control Grou... |
1565 |
cgroup_fork(p); |
1da177e4c Linux-2.6.12-rc2 |
1566 |
#ifdef CONFIG_NUMA |
846a16bf0 mempolicy: rename... |
1567 |
p->mempolicy = mpol_dup(p->mempolicy); |
fb0a685cb kernel/fork.c: fi... |
1568 1569 1570 |
if (IS_ERR(p->mempolicy)) { retval = PTR_ERR(p->mempolicy); p->mempolicy = NULL; |
e8604cb43 cgroup: fix spuri... |
1571 |
goto bad_fork_cleanup_threadgroup_lock; |
fb0a685cb kernel/fork.c: fi... |
1572 |
} |
1da177e4c Linux-2.6.12-rc2 |
1573 |
#endif |
778d3b0ff cpusets: randomiz... |
1574 1575 1576 |
#ifdef CONFIG_CPUSETS p->cpuset_mem_spread_rotor = NUMA_NO_NODE; p->cpuset_slab_spread_rotor = NUMA_NO_NODE; |
cc9a6c877 cpuset: mm: reduc... |
1577 |
seqcount_init(&p->mems_allowed_seq); |
778d3b0ff cpusets: randomiz... |
1578 |
#endif |
de30a2b35 [PATCH] lockdep: ... |
1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 |
#ifdef CONFIG_TRACE_IRQFLAGS p->irq_events = 0; p->hardirqs_enabled = 0; p->hardirq_enable_ip = 0; p->hardirq_enable_event = 0; p->hardirq_disable_ip = _THIS_IP_; p->hardirq_disable_event = 0; p->softirqs_enabled = 1; p->softirq_enable_ip = _THIS_IP_; p->softirq_enable_event = 0; p->softirq_disable_ip = 0; p->softirq_disable_event = 0; p->hardirq_context = 0; p->softirq_context = 0; #endif |
8bcbde548 sched/preempt, mm... |
1594 1595 |
p->pagefault_disabled = 0; |
fbb9ce953 [PATCH] lockdep: ... |
1596 1597 1598 1599 |
#ifdef CONFIG_LOCKDEP p->lockdep_depth = 0; /* no locks held yet */ p->curr_chain_key = 0; p->lockdep_recursion = 0; |
b09be676e locking/lockdep: ... |
1600 |
lockdep_init_task(p); |
fbb9ce953 [PATCH] lockdep: ... |
1601 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
1602 |
|
408894ee4 [PATCH] mutex sub... |
1603 1604 1605 |
#ifdef CONFIG_DEBUG_MUTEXES p->blocked_on = NULL; /* not blocked yet */ #endif |
cafe56359 bcache: A block l... |
1606 1607 1608 1609 |
#ifdef CONFIG_BCACHE p->sequential_io = 0; p->sequential_io_avg = 0; #endif |
0f4814065 x86, ptrace: add ... |
1610 |
|
3c90e6e99 sched: fix copy_n... |
1611 |
/* Perform scheduler related setup. Assign this task to a CPU. */ |
aab03e05e sched/deadline: A... |
1612 1613 1614 |
retval = sched_fork(clone_flags, p); if (retval) goto bad_fork_cleanup_policy; |
6ab423e0e perf_counter: Pro... |
1615 |
|
cdd6c482c perf: Do the big ... |
1616 |
retval = perf_event_init_task(p); |
6ab423e0e perf_counter: Pro... |
1617 1618 |
if (retval) goto bad_fork_cleanup_policy; |
fb0a685cb kernel/fork.c: fi... |
1619 1620 |
retval = audit_alloc(p); if (retval) |
6c72e3501 perf: fix perf bu... |
1621 |
goto bad_fork_cleanup_perf; |
1da177e4c Linux-2.6.12-rc2 |
1622 |
/* copy all the process information */ |
ab602f799 shm: make exit_sh... |
1623 |
shm_init_task(p); |
e4e55b47e LSM: Revive secur... |
1624 |
retval = security_task_alloc(p, clone_flags); |
fb0a685cb kernel/fork.c: fi... |
1625 |
if (retval) |
1da177e4c Linux-2.6.12-rc2 |
1626 |
goto bad_fork_cleanup_audit; |
e4e55b47e LSM: Revive secur... |
1627 1628 1629 |
retval = copy_semundo(clone_flags, p); if (retval) goto bad_fork_cleanup_security; |
fb0a685cb kernel/fork.c: fi... |
1630 1631 |
retval = copy_files(clone_flags, p); if (retval) |
1da177e4c Linux-2.6.12-rc2 |
1632 |
goto bad_fork_cleanup_semundo; |
fb0a685cb kernel/fork.c: fi... |
1633 1634 |
retval = copy_fs(clone_flags, p); if (retval) |
1da177e4c Linux-2.6.12-rc2 |
1635 |
goto bad_fork_cleanup_files; |
fb0a685cb kernel/fork.c: fi... |
1636 1637 |
retval = copy_sighand(clone_flags, p); if (retval) |
1da177e4c Linux-2.6.12-rc2 |
1638 |
goto bad_fork_cleanup_fs; |
fb0a685cb kernel/fork.c: fi... |
1639 1640 |
retval = copy_signal(clone_flags, p); if (retval) |
1da177e4c Linux-2.6.12-rc2 |
1641 |
goto bad_fork_cleanup_sighand; |
fb0a685cb kernel/fork.c: fi... |
1642 1643 |
retval = copy_mm(clone_flags, p); if (retval) |
1da177e4c Linux-2.6.12-rc2 |
1644 |
goto bad_fork_cleanup_signal; |
fb0a685cb kernel/fork.c: fi... |
1645 1646 |
retval = copy_namespaces(clone_flags, p); if (retval) |
d84f4f992 CRED: Inaugurate ... |
1647 |
goto bad_fork_cleanup_mm; |
fb0a685cb kernel/fork.c: fi... |
1648 1649 |
retval = copy_io(clone_flags, p); if (retval) |
fd0928df9 ioprio: move io p... |
1650 |
goto bad_fork_cleanup_namespaces; |
3033f14ab clone: support pa... |
1651 |
retval = copy_thread_tls(clone_flags, stack_start, stack_size, p, tls); |
1da177e4c Linux-2.6.12-rc2 |
1652 |
if (retval) |
fd0928df9 ioprio: move io p... |
1653 |
goto bad_fork_cleanup_io; |
1da177e4c Linux-2.6.12-rc2 |
1654 |
|
425fb2b4b pid namespaces: m... |
1655 |
if (pid != &init_struct_pid) { |
c2b1df2eb Rename nsproxy.pi... |
1656 |
pid = alloc_pid(p->nsproxy->pid_ns_for_children); |
35f71bc0a fork: report pid ... |
1657 1658 |
if (IS_ERR(pid)) { retval = PTR_ERR(pid); |
0740aa5f6 fork: free thread... |
1659 |
goto bad_fork_cleanup_thread; |
35f71bc0a fork: report pid ... |
1660 |
} |
425fb2b4b pid namespaces: m... |
1661 |
} |
73c101011 block: initial pa... |
1662 1663 1664 |
#ifdef CONFIG_BLOCK p->plug = NULL; #endif |
42b2dd0a0 Shrink task_struc... |
1665 |
#ifdef CONFIG_FUTEX |
8f17d3a50 [PATCH] lightweig... |
1666 1667 1668 1669 |
p->robust_list = NULL; #ifdef CONFIG_COMPAT p->compat_robust_list = NULL; #endif |
c87e2837b [PATCH] pi-futex:... |
1670 1671 |
INIT_LIST_HEAD(&p->pi_state_list); p->pi_state_cache = NULL; |
42b2dd0a0 Shrink task_struc... |
1672 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
1673 |
/* |
f9a3879ab [PATCH] Fix sigal... |
1674 1675 1676 |
* sigaltstack should be cleared when sharing the same VM */ if ((clone_flags & (CLONE_VM|CLONE_VFORK)) == CLONE_VM) |
2a7421383 signals/sigaltsta... |
1677 |
sas_ss_reset(p); |
f9a3879ab [PATCH] Fix sigal... |
1678 1679 |
/* |
6580807da ptrace: copy_proc... |
1680 1681 |
* Syscall tracing and stepping should be turned off in the * child regardless of CLONE_PTRACE. |
1da177e4c Linux-2.6.12-rc2 |
1682 |
*/ |
6580807da ptrace: copy_proc... |
1683 |
user_disable_single_step(p); |
1da177e4c Linux-2.6.12-rc2 |
1684 |
clear_tsk_thread_flag(p, TIF_SYSCALL_TRACE); |
ed75e8d58 [PATCH] UML Suppo... |
1685 1686 1687 |
#ifdef TIF_SYSCALL_EMU clear_tsk_thread_flag(p, TIF_SYSCALL_EMU); #endif |
9745512ce sched: latencytop... |
1688 |
clear_all_latency_tracing(p); |
1da177e4c Linux-2.6.12-rc2 |
1689 |
|
1da177e4c Linux-2.6.12-rc2 |
1690 |
/* ok, now we should be set up.. */ |
18c830df7 kernel/fork.c:cop... |
1691 1692 |
p->pid = pid_nr(pid); if (clone_flags & CLONE_THREAD) { |
5f8aadd8b CLONE_PARENT shou... |
1693 |
p->exit_signal = -1; |
18c830df7 kernel/fork.c:cop... |
1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 |
p->group_leader = current->group_leader; p->tgid = current->tgid; } else { if (clone_flags & CLONE_PARENT) p->exit_signal = current->group_leader->exit_signal; else p->exit_signal = (clone_flags & CSIGNAL); p->group_leader = p; p->tgid = p->pid; } |
5f8aadd8b CLONE_PARENT shou... |
1704 |
|
9d823e8f6 writeback: per ta... |
1705 1706 |
p->nr_dirtied = 0; p->nr_dirtied_pause = 128 >> (PAGE_SHIFT - 10); |
83712358b writeback: dirty ... |
1707 |
p->dirty_paused_when = 0; |
9d823e8f6 writeback: per ta... |
1708 |
|
bb8cbbfee tasks/fork: Remov... |
1709 |
p->pdeath_signal = 0; |
47e65328a [PATCH] pids: kil... |
1710 |
INIT_LIST_HEAD(&p->thread_group); |
158e1645e trim task_work: g... |
1711 |
p->task_works = NULL; |
1da177e4c Linux-2.6.12-rc2 |
1712 |
|
780de9dd2 sched/headers, cg... |
1713 |
cgroup_threadgroup_change_begin(current); |
18c830df7 kernel/fork.c:cop... |
1714 |
/* |
7e47682ea cgroup: allow a c... |
1715 1716 1717 1718 1719 |
* Ensure that the cgroup subsystem policies allow the new process to be * forked. It should be noted the the new process's css_set can be changed * between here and cgroup_post_fork() if an organisation operation is in * progress. */ |
b53202e63 cgroup: kill cgrp... |
1720 |
retval = cgroup_can_fork(p); |
7e47682ea cgroup: allow a c... |
1721 1722 1723 1724 |
if (retval) goto bad_fork_free_pid; /* |
3f2e4e1d9 fork: record star... |
1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 |
* From this point on we must avoid any synchronous user-space * communication until we take the tasklist-lock. In particular, we do * not want user-space to be able to predict the process start-time by * stalling fork(2) after we recorded the start_time but before it is * visible to the system. */ p->start_time = ktime_get_ns(); p->real_start_time = ktime_get_boot_ns(); /* |
18c830df7 kernel/fork.c:cop... |
1736 1737 1738 |
* Make it visible to the rest of the system, but dont wake it up yet. * Need tasklist lock for parent etc handling! */ |
1da177e4c Linux-2.6.12-rc2 |
1739 |
write_lock_irq(&tasklist_lock); |
1da177e4c Linux-2.6.12-rc2 |
1740 |
/* CLONE_PARENT re-uses the old parent */ |
2d5516cbb copy_process: fix... |
1741 |
if (clone_flags & (CLONE_PARENT|CLONE_THREAD)) { |
1da177e4c Linux-2.6.12-rc2 |
1742 |
p->real_parent = current->real_parent; |
2d5516cbb copy_process: fix... |
1743 1744 |
p->parent_exec_id = current->parent_exec_id; } else { |
1da177e4c Linux-2.6.12-rc2 |
1745 |
p->real_parent = current; |
2d5516cbb copy_process: fix... |
1746 1747 |
p->parent_exec_id = current->self_exec_id; } |
1da177e4c Linux-2.6.12-rc2 |
1748 |
|
d83a7cb37 livepatch: change... |
1749 |
klp_copy_process(p); |
3f17da699 [PATCH] fix kill_... |
1750 |
spin_lock(¤t->sighand->siglock); |
4a2c7a783 [PATCH] make fork... |
1751 1752 |
/* |
dbd952127 seccomp: introduc... |
1753 1754 1755 1756 1757 1758 |
* Copy seccomp details explicitly here, in case they were changed * before holding sighand lock. */ copy_seccomp(p); /* |
4a2c7a783 [PATCH] make fork... |
1759 1760 1761 1762 1763 1764 |
* Process group and session signals need to be delivered to just the * parent before the fork or both the parent and the child after the * fork. Restart if a signal comes in before we add the new process to * it's process group. * A fatal signal pending means that current will exit, so the new * thread can't slip out of an OOM kill (or normal SIGKILL). |
fb0a685cb kernel/fork.c: fi... |
1765 |
*/ |
23ff44402 whitespace fixes:... |
1766 |
recalc_sigpending(); |
4a2c7a783 [PATCH] make fork... |
1767 |
if (signal_pending(current)) { |
4a2c7a783 [PATCH] make fork... |
1768 |
retval = -ERESTARTNOINTR; |
7e47682ea cgroup: allow a c... |
1769 |
goto bad_fork_cancel_cgroup; |
4a2c7a783 [PATCH] make fork... |
1770 |
} |
3fd372262 pid_ns: Fix race ... |
1771 1772 1773 1774 |
if (unlikely(!(ns_of_pid(pid)->nr_hashed & PIDNS_HASH_ADDING))) { retval = -ENOMEM; goto bad_fork_cancel_cgroup; } |
4a2c7a783 [PATCH] make fork... |
1775 |
|
73b9ebfe1 [PATCH] pidhash: ... |
1776 |
if (likely(p->pid)) { |
4b9d33e6d ptrace: kill clon... |
1777 |
ptrace_init_task(p, (clone_flags & CLONE_PTRACE) || trace); |
73b9ebfe1 [PATCH] pidhash: ... |
1778 |
|
819077398 kernel/fork.c:cop... |
1779 |
init_task_pid(p, PIDTYPE_PID, pid); |
73b9ebfe1 [PATCH] pidhash: ... |
1780 |
if (thread_group_leader(p)) { |
819077398 kernel/fork.c:cop... |
1781 1782 |
init_task_pid(p, PIDTYPE_PGID, task_pgrp(current)); init_task_pid(p, PIDTYPE_SID, task_session(current)); |
1c4042c29 pidns: Consolidat... |
1783 |
if (is_child_reaper(pid)) { |
17cf22c33 pidns: Use task_a... |
1784 |
ns_of_pid(pid)->child_reaper = p; |
1c4042c29 pidns: Consolidat... |
1785 1786 |
p->signal->flags |= SIGNAL_UNKILLABLE; } |
73b9ebfe1 [PATCH] pidhash: ... |
1787 |
|
fea9d1755 ITIMER_REAL: conv... |
1788 |
p->signal->leader_pid = pid; |
9c9f4ded9 tty: Add a kref c... |
1789 |
p->signal->tty = tty_kref_get(current->signal->tty); |
749860ce2 prctl: propagate ... |
1790 1791 1792 1793 1794 1795 1796 |
/* * Inherit has_child_subreaper flag under the same * tasklist_lock with adding child to the process tree * for propagate_has_child_subreaper optimization. */ p->signal->has_child_subreaper = p->real_parent->signal->has_child_subreaper || p->real_parent->signal->is_child_subreaper; |
9cd80bbb0 do_wait() optimiz... |
1797 |
list_add_tail(&p->sibling, &p->real_parent->children); |
5e85d4abe [PATCH] task: Mak... |
1798 |
list_add_tail_rcu(&p->tasks, &init_task.tasks); |
819077398 kernel/fork.c:cop... |
1799 1800 |
attach_pid(p, PIDTYPE_PGID); attach_pid(p, PIDTYPE_SID); |
909ea9646 core: Replace __g... |
1801 |
__this_cpu_inc(process_counts); |
80628ca06 kernel/fork.c:cop... |
1802 1803 1804 1805 |
} else { current->signal->nr_threads++; atomic_inc(¤t->signal->live); atomic_inc(¤t->signal->sigcnt); |
80628ca06 kernel/fork.c:cop... |
1806 1807 |
list_add_tail_rcu(&p->thread_group, &p->group_leader->thread_group); |
0c740d0af introduce for_eac... |
1808 1809 |
list_add_tail_rcu(&p->thread_node, &p->signal->thread_head); |
73b9ebfe1 [PATCH] pidhash: ... |
1810 |
} |
819077398 kernel/fork.c:cop... |
1811 |
attach_pid(p, PIDTYPE_PID); |
73b9ebfe1 [PATCH] pidhash: ... |
1812 |
nr_threads++; |
1da177e4c Linux-2.6.12-rc2 |
1813 |
} |
1da177e4c Linux-2.6.12-rc2 |
1814 |
total_forks++; |
3f17da699 [PATCH] fix kill_... |
1815 |
spin_unlock(¤t->sighand->siglock); |
4af4206be tracing: Fix sysc... |
1816 |
syscall_tracepoint_update(p); |
1da177e4c Linux-2.6.12-rc2 |
1817 |
write_unlock_irq(&tasklist_lock); |
4af4206be tracing: Fix sysc... |
1818 |
|
c13cf856c [PATCH] fork.c: p... |
1819 |
proc_fork_connector(p); |
b53202e63 cgroup: kill cgrp... |
1820 |
cgroup_post_fork(p); |
780de9dd2 sched/headers, cg... |
1821 |
cgroup_threadgroup_change_end(current); |
cdd6c482c perf: Do the big ... |
1822 |
perf_event_fork(p); |
43d2b1132 tracepoint: add t... |
1823 1824 |
trace_task_newtask(p, clone_flags); |
3ab679661 uprobes: Teach up... |
1825 |
uprobe_copy_process(p, clone_flags); |
43d2b1132 tracepoint: add t... |
1826 |
|
1da177e4c Linux-2.6.12-rc2 |
1827 |
return p; |
7e47682ea cgroup: allow a c... |
1828 |
bad_fork_cancel_cgroup: |
3fd372262 pid_ns: Fix race ... |
1829 1830 |
spin_unlock(¤t->sighand->siglock); write_unlock_irq(&tasklist_lock); |
b53202e63 cgroup: kill cgrp... |
1831 |
cgroup_cancel_fork(p); |
425fb2b4b pid namespaces: m... |
1832 |
bad_fork_free_pid: |
780de9dd2 sched/headers, cg... |
1833 |
cgroup_threadgroup_change_end(current); |
425fb2b4b pid namespaces: m... |
1834 1835 |
if (pid != &init_struct_pid) free_pid(pid); |
0740aa5f6 fork: free thread... |
1836 1837 |
bad_fork_cleanup_thread: exit_thread(p); |
fd0928df9 ioprio: move io p... |
1838 |
bad_fork_cleanup_io: |
b69f22920 block: Fix io_con... |
1839 1840 |
if (p->io_context) exit_io_context(p); |
ab516013a [PATCH] namespace... |
1841 |
bad_fork_cleanup_namespaces: |
444f378b2 Revert "[PATCH] n... |
1842 |
exit_task_namespaces(p); |
1da177e4c Linux-2.6.12-rc2 |
1843 |
bad_fork_cleanup_mm: |
c9f01245b oom: remove oom_d... |
1844 |
if (p->mm) |
1da177e4c Linux-2.6.12-rc2 |
1845 1846 |
mmput(p->mm); bad_fork_cleanup_signal: |
4ab6c0833 clone(): fix race... |
1847 |
if (!(clone_flags & CLONE_THREAD)) |
1c5354de9 sched: Move sched... |
1848 |
free_signal_struct(p->signal); |
1da177e4c Linux-2.6.12-rc2 |
1849 |
bad_fork_cleanup_sighand: |
a7e5328a0 [PATCH] cleanup _... |
1850 |
__cleanup_sighand(p->sighand); |
1da177e4c Linux-2.6.12-rc2 |
1851 1852 1853 1854 1855 1856 |
bad_fork_cleanup_fs: exit_fs(p); /* blocking */ bad_fork_cleanup_files: exit_files(p); /* blocking */ bad_fork_cleanup_semundo: exit_sem(p); |
e4e55b47e LSM: Revive secur... |
1857 1858 |
bad_fork_cleanup_security: security_task_free(p); |
1da177e4c Linux-2.6.12-rc2 |
1859 1860 |
bad_fork_cleanup_audit: audit_free(p); |
6c72e3501 perf: fix perf bu... |
1861 |
bad_fork_cleanup_perf: |
cdd6c482c perf: Do the big ... |
1862 |
perf_event_free_task(p); |
6c72e3501 perf: fix perf bu... |
1863 |
bad_fork_cleanup_policy: |
b09be676e locking/lockdep: ... |
1864 |
lockdep_free_task(p); |
1da177e4c Linux-2.6.12-rc2 |
1865 |
#ifdef CONFIG_NUMA |
f0be3d32b mempolicy: rename... |
1866 |
mpol_put(p->mempolicy); |
e8604cb43 cgroup: fix spuri... |
1867 |
bad_fork_cleanup_threadgroup_lock: |
1da177e4c Linux-2.6.12-rc2 |
1868 |
#endif |
35df17c57 [PATCH] task dela... |
1869 |
delayacct_tsk_free(p); |
1da177e4c Linux-2.6.12-rc2 |
1870 |
bad_fork_cleanup_count: |
d84f4f992 CRED: Inaugurate ... |
1871 |
atomic_dec(&p->cred->user->processes); |
e0e817392 CRED: Add some co... |
1872 |
exit_creds(p); |
1da177e4c Linux-2.6.12-rc2 |
1873 |
bad_fork_free: |
405c07597 fork: Add task st... |
1874 |
p->state = TASK_DEAD; |
68f24b08e sched/core: Free ... |
1875 |
put_task_stack(p); |
1da177e4c Linux-2.6.12-rc2 |
1876 |
free_task(p); |
fe7d37d1f [PATCH] copy_proc... |
1877 1878 |
fork_out: return ERR_PTR(retval); |
1da177e4c Linux-2.6.12-rc2 |
1879 |
} |
f106eee10 pids: fix fork_id... |
1880 1881 1882 1883 1884 1885 1886 1887 1888 |
static inline void init_idle_pids(struct pid_link *links) { enum pid_type type; for (type = PIDTYPE_PID; type < PIDTYPE_MAX; ++type) { INIT_HLIST_NODE(&links[type].node); /* not really needed */ links[type].pid = &init_struct_pid; } } |
0db0628d9 kernel: delete __... |
1889 |
struct task_struct *fork_idle(int cpu) |
1da177e4c Linux-2.6.12-rc2 |
1890 |
{ |
36c8b5868 [PATCH] sched: cl... |
1891 |
struct task_struct *task; |
725fc629f kernek/fork.c: al... |
1892 1893 |
task = copy_process(CLONE_VM, 0, 0, NULL, &init_struct_pid, 0, 0, cpu_to_node(cpu)); |
f106eee10 pids: fix fork_id... |
1894 1895 |
if (!IS_ERR(task)) { init_idle_pids(task->pids); |
753ca4f31 [PATCH] fix copy_... |
1896 |
init_idle(task, cpu); |
f106eee10 pids: fix fork_id... |
1897 |
} |
73b9ebfe1 [PATCH] pidhash: ... |
1898 |
|
1da177e4c Linux-2.6.12-rc2 |
1899 1900 |
return task; } |
1da177e4c Linux-2.6.12-rc2 |
1901 1902 1903 1904 1905 1906 |
/* * Ok, this is the main fork-routine. * * It copies the process, and if successful kick-starts * it and waits for it to finish using the VM if required. */ |
3033f14ab clone: support pa... |
1907 |
long _do_fork(unsigned long clone_flags, |
1da177e4c Linux-2.6.12-rc2 |
1908 |
unsigned long stack_start, |
1da177e4c Linux-2.6.12-rc2 |
1909 1910 |
unsigned long stack_size, int __user *parent_tidptr, |
3033f14ab clone: support pa... |
1911 1912 |
int __user *child_tidptr, unsigned long tls) |
1da177e4c Linux-2.6.12-rc2 |
1913 1914 1915 |
{ struct task_struct *p; int trace = 0; |
92476d7fc [PATCH] pidhash: ... |
1916 |
long nr; |
1da177e4c Linux-2.6.12-rc2 |
1917 |
|
bdff746a3 clone: prepare to... |
1918 |
/* |
4b9d33e6d ptrace: kill clon... |
1919 1920 1921 1922 |
* Determine whether and which event to report to ptracer. When * called from kernel_thread or CLONE_UNTRACED is explicitly * requested, no event is reported; otherwise, report if the event * for the type of forking is enabled. |
09a05394f tracehook: clone |
1923 |
*/ |
e80d6661c flagday: kill pt_... |
1924 |
if (!(clone_flags & CLONE_UNTRACED)) { |
4b9d33e6d ptrace: kill clon... |
1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 |
if (clone_flags & CLONE_VFORK) trace = PTRACE_EVENT_VFORK; else if ((clone_flags & CSIGNAL) != SIGCHLD) trace = PTRACE_EVENT_CLONE; else trace = PTRACE_EVENT_FORK; if (likely(!ptrace_event_enabled(current, trace))) trace = 0; } |
1da177e4c Linux-2.6.12-rc2 |
1935 |
|
62e791c1b don't pass regs t... |
1936 |
p = copy_process(clone_flags, stack_start, stack_size, |
725fc629f kernek/fork.c: al... |
1937 |
child_tidptr, NULL, trace, tls, NUMA_NO_NODE); |
38addce8b gcc-plugins: Add ... |
1938 |
add_latent_entropy(); |
1da177e4c Linux-2.6.12-rc2 |
1939 1940 1941 1942 1943 1944 |
/* * Do this prior waking up the new thread - the thread pointer * might get invalid after that point, if the thread exits quickly. */ if (!IS_ERR(p)) { struct completion vfork; |
4e52365f2 ptrace: fix fork ... |
1945 |
struct pid *pid; |
1da177e4c Linux-2.6.12-rc2 |
1946 |
|
0a16b6075 tracing, sched: L... |
1947 |
trace_sched_process_fork(current, p); |
4e52365f2 ptrace: fix fork ... |
1948 1949 |
pid = get_task_pid(p, PIDTYPE_PID); nr = pid_vnr(pid); |
30e49c263 pid namespaces: a... |
1950 1951 1952 |
if (clone_flags & CLONE_PARENT_SETTID) put_user(nr, parent_tidptr); |
a6f5e0637 pid namespaces: m... |
1953 |
|
1da177e4c Linux-2.6.12-rc2 |
1954 1955 1956 |
if (clone_flags & CLONE_VFORK) { p->vfork_done = &vfork; init_completion(&vfork); |
d68b46fe1 vfork: make it ki... |
1957 |
get_task_struct(p); |
1da177e4c Linux-2.6.12-rc2 |
1958 |
} |
3e51e3edf sched: Remove unu... |
1959 |
wake_up_new_task(p); |
1da177e4c Linux-2.6.12-rc2 |
1960 |
|
4b9d33e6d ptrace: kill clon... |
1961 1962 |
/* forking complete and child started to run, tell ptracer */ if (unlikely(trace)) |
4e52365f2 ptrace: fix fork ... |
1963 |
ptrace_event_pid(trace, pid); |
09a05394f tracehook: clone |
1964 |
|
1da177e4c Linux-2.6.12-rc2 |
1965 |
if (clone_flags & CLONE_VFORK) { |
d68b46fe1 vfork: make it ki... |
1966 |
if (!wait_for_vfork_done(p, &vfork)) |
4e52365f2 ptrace: fix fork ... |
1967 |
ptrace_event_pid(PTRACE_EVENT_VFORK_DONE, pid); |
1da177e4c Linux-2.6.12-rc2 |
1968 |
} |
4e52365f2 ptrace: fix fork ... |
1969 1970 |
put_pid(pid); |
1da177e4c Linux-2.6.12-rc2 |
1971 |
} else { |
92476d7fc [PATCH] pidhash: ... |
1972 |
nr = PTR_ERR(p); |
1da177e4c Linux-2.6.12-rc2 |
1973 |
} |
92476d7fc [PATCH] pidhash: ... |
1974 |
return nr; |
1da177e4c Linux-2.6.12-rc2 |
1975 |
} |
3033f14ab clone: support pa... |
1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 |
#ifndef CONFIG_HAVE_COPY_THREAD_TLS /* For compatibility with architectures that call do_fork directly rather than * using the syscall entry points below. */ long do_fork(unsigned long clone_flags, unsigned long stack_start, unsigned long stack_size, int __user *parent_tidptr, int __user *child_tidptr) { return _do_fork(clone_flags, stack_start, stack_size, parent_tidptr, child_tidptr, 0); } #endif |
2aa3a7f86 preparation for g... |
1989 1990 1991 1992 1993 |
/* * Create a kernel thread. */ pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags) { |
3033f14ab clone: support pa... |
1994 1995 |
return _do_fork(flags|CLONE_VM|CLONE_UNTRACED, (unsigned long)fn, (unsigned long)arg, NULL, NULL, 0); |
2aa3a7f86 preparation for g... |
1996 |
} |
2aa3a7f86 preparation for g... |
1997 |
|
d2125043a generic sys_fork ... |
1998 1999 2000 2001 |
#ifdef __ARCH_WANT_SYS_FORK SYSCALL_DEFINE0(fork) { #ifdef CONFIG_MMU |
3033f14ab clone: support pa... |
2002 |
return _do_fork(SIGCHLD, 0, 0, NULL, NULL, 0); |
d2125043a generic sys_fork ... |
2003 2004 |
#else /* can not support in nommu mode */ |
5d59e1827 kernel/fork.c: fi... |
2005 |
return -EINVAL; |
d2125043a generic sys_fork ... |
2006 2007 2008 2009 2010 2011 2012 |
#endif } #endif #ifdef __ARCH_WANT_SYS_VFORK SYSCALL_DEFINE0(vfork) { |
3033f14ab clone: support pa... |
2013 2014 |
return _do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, 0, 0, NULL, NULL, 0); |
d2125043a generic sys_fork ... |
2015 2016 2017 2018 2019 2020 2021 |
} #endif #ifdef __ARCH_WANT_SYS_CLONE #ifdef CONFIG_CLONE_BACKWARDS SYSCALL_DEFINE5(clone, unsigned long, clone_flags, unsigned long, newsp, int __user *, parent_tidptr, |
3033f14ab clone: support pa... |
2022 |
unsigned long, tls, |
d2125043a generic sys_fork ... |
2023 2024 2025 2026 2027 |
int __user *, child_tidptr) #elif defined(CONFIG_CLONE_BACKWARDS2) SYSCALL_DEFINE5(clone, unsigned long, newsp, unsigned long, clone_flags, int __user *, parent_tidptr, int __user *, child_tidptr, |
3033f14ab clone: support pa... |
2028 |
unsigned long, tls) |
dfa9771a7 microblaze: fix c... |
2029 2030 2031 2032 2033 |
#elif defined(CONFIG_CLONE_BACKWARDS3) SYSCALL_DEFINE6(clone, unsigned long, clone_flags, unsigned long, newsp, int, stack_size, int __user *, parent_tidptr, int __user *, child_tidptr, |
3033f14ab clone: support pa... |
2034 |
unsigned long, tls) |
d2125043a generic sys_fork ... |
2035 2036 2037 2038 |
#else SYSCALL_DEFINE5(clone, unsigned long, clone_flags, unsigned long, newsp, int __user *, parent_tidptr, int __user *, child_tidptr, |
3033f14ab clone: support pa... |
2039 |
unsigned long, tls) |
d2125043a generic sys_fork ... |
2040 2041 |
#endif { |
3033f14ab clone: support pa... |
2042 |
return _do_fork(clone_flags, newsp, 0, parent_tidptr, child_tidptr, tls); |
d2125043a generic sys_fork ... |
2043 2044 |
} #endif |
0f1b92cbd introduce the wal... |
2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 |
void walk_process_tree(struct task_struct *top, proc_visitor visitor, void *data) { struct task_struct *leader, *parent, *child; int res; read_lock(&tasklist_lock); leader = top = top->group_leader; down: for_each_thread(leader, parent) { list_for_each_entry(child, &parent->children, sibling) { res = visitor(child, data); if (res) { if (res < 0) goto out; leader = child; goto down; } up: ; } } if (leader != top) { child = leader; parent = child->real_parent; leader = parent->group_leader; goto up; } out: read_unlock(&tasklist_lock); } |
5fd63b308 [PATCH] x86_64: I... |
2076 2077 2078 |
#ifndef ARCH_MIN_MMSTRUCT_ALIGN #define ARCH_MIN_MMSTRUCT_ALIGN 0 #endif |
51cc50685 SL*B: drop kmem c... |
2079 |
static void sighand_ctor(void *data) |
aa1757f90 [PATCH] convert s... |
2080 2081 |
{ struct sighand_struct *sighand = data; |
a35afb830 Remove SLAB_CTOR_... |
2082 |
spin_lock_init(&sighand->siglock); |
b8fceee17 signalfd simplifi... |
2083 |
init_waitqueue_head(&sighand->signalfd_wqh); |
aa1757f90 [PATCH] convert s... |
2084 |
} |
1da177e4c Linux-2.6.12-rc2 |
2085 2086 2087 2088 |
void __init proc_caches_init(void) { sighand_cachep = kmem_cache_create("sighand_cache", sizeof(struct sighand_struct), 0, |
5f0d5a3ae mm: Rename SLAB_D... |
2089 |
SLAB_HWCACHE_ALIGN|SLAB_PANIC|SLAB_TYPESAFE_BY_RCU| |
ae63fd26b kmemcheck: stop u... |
2090 |
SLAB_ACCOUNT, sighand_ctor); |
1da177e4c Linux-2.6.12-rc2 |
2091 2092 |
signal_cachep = kmem_cache_create("signal_cache", sizeof(struct signal_struct), 0, |
ae63fd26b kmemcheck: stop u... |
2093 |
SLAB_HWCACHE_ALIGN|SLAB_PANIC|SLAB_ACCOUNT, |
5d097056c kmemcg: account c... |
2094 |
NULL); |
20c2df83d mm: Remove slab d... |
2095 |
files_cachep = kmem_cache_create("files_cache", |
1da177e4c Linux-2.6.12-rc2 |
2096 |
sizeof(struct files_struct), 0, |
ae63fd26b kmemcheck: stop u... |
2097 |
SLAB_HWCACHE_ALIGN|SLAB_PANIC|SLAB_ACCOUNT, |
5d097056c kmemcg: account c... |
2098 |
NULL); |
20c2df83d mm: Remove slab d... |
2099 |
fs_cachep = kmem_cache_create("fs_cache", |
1da177e4c Linux-2.6.12-rc2 |
2100 |
sizeof(struct fs_struct), 0, |
ae63fd26b kmemcheck: stop u... |
2101 |
SLAB_HWCACHE_ALIGN|SLAB_PANIC|SLAB_ACCOUNT, |
5d097056c kmemcg: account c... |
2102 |
NULL); |
6345d24da mm: Fix boot cras... |
2103 2104 2105 2106 2107 2108 2109 |
/* * FIXME! The "sizeof(struct mm_struct)" currently includes the * whole struct cpumask for the OFFSTACK case. We could change * this to *only* allocate as much of it as required by the * maximum number of CPU's we can ever have. The cpumask_allocation * is at the end of the structure, exactly for that reason. */ |
1da177e4c Linux-2.6.12-rc2 |
2110 |
mm_cachep = kmem_cache_create("mm_struct", |
5fd63b308 [PATCH] x86_64: I... |
2111 |
sizeof(struct mm_struct), ARCH_MIN_MMSTRUCT_ALIGN, |
ae63fd26b kmemcheck: stop u... |
2112 |
SLAB_HWCACHE_ALIGN|SLAB_PANIC|SLAB_ACCOUNT, |
5d097056c kmemcg: account c... |
2113 2114 |
NULL); vm_area_cachep = KMEM_CACHE(vm_area_struct, SLAB_PANIC|SLAB_ACCOUNT); |
8feae1311 NOMMU: Make VMAs ... |
2115 |
mmap_init(); |
665771939 make sure that ns... |
2116 |
nsproxy_cache_init(); |
1da177e4c Linux-2.6.12-rc2 |
2117 |
} |
cf2e340f4 [PATCH] unshare s... |
2118 |
|
cf2e340f4 [PATCH] unshare s... |
2119 |
/* |
9bfb23fc4 sys_unshare: remo... |
2120 |
* Check constraints on flags passed to the unshare system call. |
cf2e340f4 [PATCH] unshare s... |
2121 |
*/ |
9bfb23fc4 sys_unshare: remo... |
2122 |
static int check_unshare_flags(unsigned long unshare_flags) |
cf2e340f4 [PATCH] unshare s... |
2123 |
{ |
9bfb23fc4 sys_unshare: remo... |
2124 2125 |
if (unshare_flags & ~(CLONE_THREAD|CLONE_FS|CLONE_NEWNS|CLONE_SIGHAND| CLONE_VM|CLONE_FILES|CLONE_SYSVSEM| |
50804fe37 pidns: Support un... |
2126 |
CLONE_NEWUTS|CLONE_NEWIPC|CLONE_NEWNET| |
a79a908fd cgroup: introduce... |
2127 |
CLONE_NEWUSER|CLONE_NEWPID|CLONE_NEWCGROUP)) |
9bfb23fc4 sys_unshare: remo... |
2128 |
return -EINVAL; |
cf2e340f4 [PATCH] unshare s... |
2129 |
/* |
12c641ab8 unshare: Unsharin... |
2130 2131 2132 2133 |
* Not implemented, but pretend it works if there is nothing * to unshare. Note that unsharing the address space or the * signal handlers also need to unshare the signal queues (aka * CLONE_THREAD). |
cf2e340f4 [PATCH] unshare s... |
2134 |
*/ |
9bfb23fc4 sys_unshare: remo... |
2135 |
if (unshare_flags & (CLONE_THREAD | CLONE_SIGHAND | CLONE_VM)) { |
12c641ab8 unshare: Unsharin... |
2136 2137 2138 2139 2140 2141 2142 2143 2144 |
if (!thread_group_empty(current)) return -EINVAL; } if (unshare_flags & (CLONE_SIGHAND | CLONE_VM)) { if (atomic_read(¤t->sighand->count) > 1) return -EINVAL; } if (unshare_flags & CLONE_VM) { if (!current_is_single_threaded()) |
9bfb23fc4 sys_unshare: remo... |
2145 2146 |
return -EINVAL; } |
cf2e340f4 [PATCH] unshare s... |
2147 2148 2149 2150 2151 |
return 0; } /* |
99d1419d9 [PATCH] unshare s... |
2152 |
* Unshare the filesystem structure if it is being shared |
cf2e340f4 [PATCH] unshare s... |
2153 2154 2155 2156 |
*/ static int unshare_fs(unsigned long unshare_flags, struct fs_struct **new_fsp) { struct fs_struct *fs = current->fs; |
498052bba New locking/refco... |
2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 |
if (!(unshare_flags & CLONE_FS) || !fs) return 0; /* don't need lock here; in the worst case we'll do useless copy */ if (fs->users == 1) return 0; *new_fsp = copy_fs_struct(fs); if (!*new_fsp) return -ENOMEM; |
cf2e340f4 [PATCH] unshare s... |
2167 2168 2169 2170 2171 |
return 0; } /* |
a016f3389 [PATCH] unshare s... |
2172 |
* Unshare file descriptor table if it is being shared |
cf2e340f4 [PATCH] unshare s... |
2173 2174 2175 2176 |
*/ static int unshare_fd(unsigned long unshare_flags, struct files_struct **new_fdp) { struct files_struct *fd = current->files; |
a016f3389 [PATCH] unshare s... |
2177 |
int error = 0; |
cf2e340f4 [PATCH] unshare s... |
2178 2179 |
if ((unshare_flags & CLONE_FILES) && |
a016f3389 [PATCH] unshare s... |
2180 2181 2182 2183 2184 |
(fd && atomic_read(&fd->count) > 1)) { *new_fdp = dup_fd(fd, &error); if (!*new_fdp) return error; } |
cf2e340f4 [PATCH] unshare s... |
2185 2186 2187 2188 2189 |
return 0; } /* |
cf2e340f4 [PATCH] unshare s... |
2190 2191 2192 2193 2194 2195 2196 |
* unshare allows a process to 'unshare' part of the process * context which was originally shared using clone. copy_* * functions used by do_fork() cannot be used here directly * because they modify an inactive task_struct that is being * constructed. Here we are modifying the current, active, * task_struct. */ |
6559eed8c [CVE-2009-0029] S... |
2197 |
SYSCALL_DEFINE1(unshare, unsigned long, unshare_flags) |
cf2e340f4 [PATCH] unshare s... |
2198 |
{ |
cf2e340f4 [PATCH] unshare s... |
2199 |
struct fs_struct *fs, *new_fs = NULL; |
cf2e340f4 [PATCH] unshare s... |
2200 |
struct files_struct *fd, *new_fd = NULL; |
b2e0d9870 userns: Implement... |
2201 |
struct cred *new_cred = NULL; |
cf7b708c8 Make access to ta... |
2202 |
struct nsproxy *new_nsproxy = NULL; |
9edff4ab1 ipc: sysvsem: imp... |
2203 |
int do_sysvsem = 0; |
9bfb23fc4 sys_unshare: remo... |
2204 |
int err; |
cf2e340f4 [PATCH] unshare s... |
2205 |
|
50804fe37 pidns: Support un... |
2206 |
/* |
faf00da54 userns,pidns: For... |
2207 2208 |
* If unsharing a user namespace must also unshare the thread group * and unshare the filesystem root and working directories. |
b2e0d9870 userns: Implement... |
2209 2210 |
*/ if (unshare_flags & CLONE_NEWUSER) |
e66eded83 userns: Don't all... |
2211 |
unshare_flags |= CLONE_THREAD | CLONE_FS; |
b2e0d9870 userns: Implement... |
2212 |
/* |
50804fe37 pidns: Support un... |
2213 2214 2215 2216 |
* If unsharing vm, must also unshare signal handlers. */ if (unshare_flags & CLONE_VM) unshare_flags |= CLONE_SIGHAND; |
6013f67fc ipc: sysvsem: for... |
2217 |
/* |
12c641ab8 unshare: Unsharin... |
2218 2219 2220 2221 2222 |
* If unsharing a signal handlers, must also unshare the signal queues. */ if (unshare_flags & CLONE_SIGHAND) unshare_flags |= CLONE_THREAD; /* |
9bfb23fc4 sys_unshare: remo... |
2223 2224 2225 2226 |
* If unsharing namespace, must also unshare filesystem information. */ if (unshare_flags & CLONE_NEWNS) unshare_flags |= CLONE_FS; |
50804fe37 pidns: Support un... |
2227 2228 2229 2230 |
err = check_unshare_flags(unshare_flags); if (err) goto bad_unshare_out; |
9bfb23fc4 sys_unshare: remo... |
2231 |
/* |
6013f67fc ipc: sysvsem: for... |
2232 2233 2234 2235 2236 |
* CLONE_NEWIPC must also detach from the undolist: after switching * to a new ipc namespace, the semaphore arrays from the old * namespace are unreachable. */ if (unshare_flags & (CLONE_NEWIPC|CLONE_SYSVSEM)) |
9edff4ab1 ipc: sysvsem: imp... |
2237 |
do_sysvsem = 1; |
fb0a685cb kernel/fork.c: fi... |
2238 2239 |
err = unshare_fs(unshare_flags, &new_fs); if (err) |
9bfb23fc4 sys_unshare: remo... |
2240 |
goto bad_unshare_out; |
fb0a685cb kernel/fork.c: fi... |
2241 2242 |
err = unshare_fd(unshare_flags, &new_fd); if (err) |
9bfb23fc4 sys_unshare: remo... |
2243 |
goto bad_unshare_cleanup_fs; |
b2e0d9870 userns: Implement... |
2244 |
err = unshare_userns(unshare_flags, &new_cred); |
fb0a685cb kernel/fork.c: fi... |
2245 |
if (err) |
9edff4ab1 ipc: sysvsem: imp... |
2246 |
goto bad_unshare_cleanup_fd; |
b2e0d9870 userns: Implement... |
2247 2248 2249 2250 |
err = unshare_nsproxy_namespaces(unshare_flags, &new_nsproxy, new_cred, new_fs); if (err) goto bad_unshare_cleanup_cred; |
c0b2fc316 [PATCH] uts: copy... |
2251 |
|
b2e0d9870 userns: Implement... |
2252 |
if (new_fs || new_fd || do_sysvsem || new_cred || new_nsproxy) { |
9edff4ab1 ipc: sysvsem: imp... |
2253 2254 2255 2256 2257 2258 |
if (do_sysvsem) { /* * CLONE_SYSVSEM is equivalent to sys_exit(). */ exit_sem(current); } |
ab602f799 shm: make exit_sh... |
2259 2260 2261 2262 2263 |
if (unshare_flags & CLONE_NEWIPC) { /* Orphan segments in old ns (see sem above). */ exit_shm(current); shm_init_task(current); } |
ab516013a [PATCH] namespace... |
2264 |
|
6f977e6b2 fork: unshare: re... |
2265 |
if (new_nsproxy) |
cf7b708c8 Make access to ta... |
2266 |
switch_task_namespaces(current, new_nsproxy); |
cf2e340f4 [PATCH] unshare s... |
2267 |
|
cf7b708c8 Make access to ta... |
2268 |
task_lock(current); |
cf2e340f4 [PATCH] unshare s... |
2269 2270 |
if (new_fs) { fs = current->fs; |
2a4419b5b fs: fs_struct rwl... |
2271 |
spin_lock(&fs->lock); |
cf2e340f4 [PATCH] unshare s... |
2272 |
current->fs = new_fs; |
498052bba New locking/refco... |
2273 2274 2275 2276 |
if (--fs->users) new_fs = NULL; else new_fs = fs; |
2a4419b5b fs: fs_struct rwl... |
2277 |
spin_unlock(&fs->lock); |
cf2e340f4 [PATCH] unshare s... |
2278 |
} |
cf2e340f4 [PATCH] unshare s... |
2279 2280 2281 2282 2283 2284 2285 |
if (new_fd) { fd = current->files; current->files = new_fd; new_fd = fd; } task_unlock(current); |
b2e0d9870 userns: Implement... |
2286 2287 2288 2289 2290 2291 |
if (new_cred) { /* Install the new user namespace */ commit_creds(new_cred); new_cred = NULL; } |
cf2e340f4 [PATCH] unshare s... |
2292 |
} |
e42226732 perf: Add PERF_RE... |
2293 |
perf_event_namespaces(current); |
b2e0d9870 userns: Implement... |
2294 2295 2296 |
bad_unshare_cleanup_cred: if (new_cred) put_cred(new_cred); |
cf2e340f4 [PATCH] unshare s... |
2297 2298 2299 |
bad_unshare_cleanup_fd: if (new_fd) put_files_struct(new_fd); |
cf2e340f4 [PATCH] unshare s... |
2300 2301 |
bad_unshare_cleanup_fs: if (new_fs) |
498052bba New locking/refco... |
2302 |
free_fs_struct(new_fs); |
cf2e340f4 [PATCH] unshare s... |
2303 |
|
cf2e340f4 [PATCH] unshare s... |
2304 2305 2306 |
bad_unshare_out: return err; } |
3b1253880 [PATCH] sanitize ... |
2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 |
/* * Helper to unshare the files of the current task. * We don't want to expose copy_files internals to * the exec layer of the kernel. */ int unshare_files(struct files_struct **displaced) { struct task_struct *task = current; |
50704516f Fix uninitialized... |
2317 |
struct files_struct *copy = NULL; |
3b1253880 [PATCH] sanitize ... |
2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 |
int error; error = unshare_fd(CLONE_FILES, ©); if (error || !copy) { *displaced = NULL; return error; } *displaced = task->files; task_lock(task); task->files = copy; task_unlock(task); return 0; } |
16db3d3f1 kernel/sysctl.c: ... |
2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 |
int sysctl_max_threads(struct ctl_table *table, int write, void __user *buffer, size_t *lenp, loff_t *ppos) { struct ctl_table t; int ret; int threads = max_threads; int min = MIN_THREADS; int max = MAX_THREADS; t = *table; t.data = &threads; t.extra1 = &min; t.extra2 = &max; ret = proc_dointvec_minmax(&t, write, buffer, lenp, ppos); if (ret || !write) return ret; set_max_threads(threads); return 0; } |