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kernel/fork.c
42.5 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> #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/fs.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/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/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/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 <asm/pgtable.h> #include <asm/pgalloc.h> #include <asm/uaccess.h> #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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/* * 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; } #ifndef __HAVE_ARCH_TASK_STRUCT_ALLOCATOR |
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# define alloc_task_struct_node(node) \ kmem_cache_alloc_node(task_struct_cachep, GFP_KERNEL, node) # define free_task_struct(tsk) \ kmem_cache_free(task_struct_cachep, (tsk)) |
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static struct kmem_cache *task_struct_cachep; |
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#endif |
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#ifndef __HAVE_ARCH_THREAD_INFO_ALLOCATOR |
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static struct thread_info *alloc_thread_info_node(struct task_struct *tsk, int node) |
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{ #ifdef CONFIG_DEBUG_STACK_USAGE gfp_t mask = GFP_KERNEL | __GFP_ZERO; #else gfp_t mask = GFP_KERNEL; #endif |
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struct page *page = alloc_pages_node(node, mask, THREAD_SIZE_ORDER); return page ? page_address(page) : NULL; |
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} static inline void free_thread_info(struct thread_info *ti) { free_pages((unsigned long)ti, THREAD_SIZE_ORDER); } #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 thread_info *ti, int account) { struct zone *zone = page_zone(virt_to_page(ti)); mod_zone_page_state(zone, NR_KERNEL_STACK, account); } |
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void free_task(struct task_struct *tsk) { |
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prop_local_destroy_single(&tsk->dirties); |
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account_kernel_stack(tsk->stack, -1); |
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free_thread_info(tsk->stack); |
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rt_mutex_debug_task_free(tsk); |
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ftrace_graph_exit_task(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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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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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); } |
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EXPORT_SYMBOL_GPL(__put_task_struct); |
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|
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/* * macro override instead of weak attribute alias, to workaround * gcc 4.1.0 and 4.1.1 bugs with weak attribute and empty functions. */ #ifndef arch_task_cache_init #define arch_task_cache_init() #endif |
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|
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void __init fork_init(unsigned long mempages) { #ifndef __HAVE_ARCH_TASK_STRUCT_ALLOCATOR #ifndef ARCH_MIN_TASKALIGN #define ARCH_MIN_TASKALIGN L1_CACHE_BYTES #endif /* create a slab on which task_structs can be allocated */ task_struct_cachep = kmem_cache_create("task_struct", sizeof(struct task_struct), |
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ARCH_MIN_TASKALIGN, SLAB_PANIC | SLAB_NOTRACK, NULL); |
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#endif |
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/* do the arch specific task caches init */ arch_task_cache_init(); |
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/* * The default maximum number of threads is set to a safe * value: the thread structures can take up at most half * of memory. */ max_threads = mempages / (8 * THREAD_SIZE / PAGE_SIZE); /* * we need to allow at least 20 threads to boot a system */ |
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if (max_threads < 20) |
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max_threads = 20; 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]; } |
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int __attribute__((weak)) arch_dup_task_struct(struct task_struct *dst, struct task_struct *src) { *dst = *src; return 0; } |
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static struct task_struct *dup_task_struct(struct task_struct *orig) { struct task_struct *tsk; struct thread_info *ti; |
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unsigned long *stackend; |
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int node = tsk_fork_get_node(orig); |
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int err; |
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prepare_to_copy(orig); |
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tsk = alloc_task_struct_node(node); |
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if (!tsk) return NULL; |
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ti = alloc_thread_info_node(tsk, node); |
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if (!ti) { free_task_struct(tsk); return NULL; } |
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err = arch_dup_task_struct(tsk, orig); |
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if (err) goto out; |
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tsk->stack = ti; |
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err = prop_local_init_single(&tsk->dirties); |
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if (err) goto out; |
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|
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setup_thread_stack(tsk, orig); |
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clear_user_return_notifier(tsk); |
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clear_tsk_need_resched(tsk); |
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stackend = end_of_stack(tsk); *stackend = STACK_END_MAGIC; /* for overflow detection */ |
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|
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#ifdef CONFIG_CC_STACKPROTECTOR tsk->stack_canary = get_random_int(); #endif |
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/* * One for us, one for whoever does the "release_task()" (usually * parent) */ atomic_set(&tsk->usage, 2); |
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#ifdef CONFIG_BLK_DEV_IO_TRACE |
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tsk->btrace_seq = 0; |
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#endif |
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tsk->splice_pipe = NULL; |
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account_kernel_stack(ti, 1); |
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return tsk; |
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out: free_thread_info(ti); free_task_struct(tsk); return NULL; |
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} #ifdef CONFIG_MMU |
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static int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm) |
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{ |
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struct vm_area_struct *mpnt, *tmp, *prev, **pprev; |
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struct rb_node **rb_link, *rb_parent; int retval; unsigned long charge; struct mempolicy *pol; down_write(&oldmm->mmap_sem); |
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flush_cache_dup_mm(oldmm); |
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/* * Not linked in yet - no deadlock potential: */ down_write_nested(&mm->mmap_sem, SINGLE_DEPTH_NESTING); |
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|
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mm->locked_vm = 0; mm->mmap = NULL; mm->mmap_cache = NULL; mm->free_area_cache = oldmm->mmap_base; |
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mm->cached_hole_size = ~0UL; |
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mm->map_count = 0; |
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cpumask_clear(mm_cpumask(mm)); |
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mm->mm_rb = RB_ROOT; rb_link = &mm->mm_rb.rb_node; rb_parent = NULL; pprev = &mm->mmap; |
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retval = ksm_fork(mm, oldmm); if (retval) goto out; |
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retval = khugepaged_fork(mm, oldmm); if (retval) goto out; |
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|
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prev = NULL; |
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for (mpnt = oldmm->mmap; mpnt; mpnt = mpnt->vm_next) { |
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struct file *file; if (mpnt->vm_flags & VM_DONTCOPY) { |
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long pages = vma_pages(mpnt); mm->total_vm -= pages; |
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vm_stat_account(mm, mpnt->vm_flags, mpnt->vm_file, |
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-pages); |
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continue; } charge = 0; if (mpnt->vm_flags & VM_ACCOUNT) { unsigned int len = (mpnt->vm_end - mpnt->vm_start) >> PAGE_SHIFT; if (security_vm_enough_memory(len)) goto fail_nomem; charge = len; } |
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tmp = kmem_cache_alloc(vm_area_cachep, GFP_KERNEL); |
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if (!tmp) goto fail_nomem; *tmp = *mpnt; |
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INIT_LIST_HEAD(&tmp->anon_vma_chain); |
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pol = mpol_dup(vma_policy(mpnt)); |
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retval = PTR_ERR(pol); if (IS_ERR(pol)) goto fail_nomem_policy; vma_set_policy(tmp, pol); |
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tmp->vm_mm = mm; |
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if (anon_vma_fork(tmp, mpnt)) goto fail_nomem_anon_vma_fork; |
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tmp->vm_flags &= ~VM_LOCKED; |
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tmp->vm_next = tmp->vm_prev = NULL; |
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file = tmp->vm_file; if (file) { |
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struct inode *inode = file->f_path.dentry->d_inode; |
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struct address_space *mapping = file->f_mapping; |
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get_file(file); if (tmp->vm_flags & VM_DENYWRITE) atomic_dec(&inode->i_writecount); |
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mutex_lock(&mapping->i_mmap_mutex); |
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if (tmp->vm_flags & VM_SHARED) mapping->i_mmap_writable++; |
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flush_dcache_mmap_lock(mapping); /* insert tmp into the share list, just after mpnt */ |
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vma_prio_tree_add(tmp, mpnt); |
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flush_dcache_mmap_unlock(mapping); |
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mutex_unlock(&mapping->i_mmap_mutex); |
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} /* |
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* 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); /* |
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* Link in the new vma and copy the page table entries. |
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*/ |
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*pprev = tmp; pprev = &tmp->vm_next; |
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tmp->vm_prev = prev; prev = tmp; |
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__vma_link_rb(mm, tmp, rb_link, rb_parent); rb_link = &tmp->vm_rb.rb_right; rb_parent = &tmp->vm_rb; mm->map_count++; |
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retval = copy_page_range(mm, oldmm, mpnt); |
1da177e4c Linux-2.6.12-rc2 |
396 397 398 399 400 401 402 |
if (tmp->vm_ops && tmp->vm_ops->open) tmp->vm_ops->open(tmp); if (retval) goto out; } |
d6dd61c83 [PATCH] x86: PARA... |
403 404 |
/* a new mm has just been created */ arch_dup_mmap(oldmm, mm); |
1da177e4c Linux-2.6.12-rc2 |
405 |
retval = 0; |
1da177e4c Linux-2.6.12-rc2 |
406 |
out: |
7ee782325 [PATCH] mm: dup_m... |
407 |
up_write(&mm->mmap_sem); |
fd3e42fcc [PATCH] mm: dup_m... |
408 |
flush_tlb_mm(oldmm); |
1da177e4c Linux-2.6.12-rc2 |
409 410 |
up_write(&oldmm->mmap_sem); return retval; |
5beb49305 mm: change anon_v... |
411 412 |
fail_nomem_anon_vma_fork: mpol_put(pol); |
1da177e4c Linux-2.6.12-rc2 |
413 414 415 416 417 418 419 |
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... |
420 |
static inline int mm_alloc_pgd(struct mm_struct *mm) |
1da177e4c Linux-2.6.12-rc2 |
421 422 423 424 425 426 |
{ mm->pgd = pgd_alloc(mm); if (unlikely(!mm->pgd)) return -ENOMEM; return 0; } |
fb0a685cb kernel/fork.c: fi... |
427 |
static inline void mm_free_pgd(struct mm_struct *mm) |
1da177e4c Linux-2.6.12-rc2 |
428 |
{ |
5e5419734 add mm argument t... |
429 |
pgd_free(mm, mm->pgd); |
1da177e4c Linux-2.6.12-rc2 |
430 431 432 433 434 435 |
} #else #define dup_mmap(mm, oldmm) (0) #define mm_alloc_pgd(mm) (0) #define mm_free_pgd(mm) #endif /* CONFIG_MMU */ |
23ff44402 whitespace fixes:... |
436 |
__cacheline_aligned_in_smp DEFINE_SPINLOCK(mmlist_lock); |
1da177e4c Linux-2.6.12-rc2 |
437 |
|
e94b17660 [PATCH] slab: rem... |
438 |
#define allocate_mm() (kmem_cache_alloc(mm_cachep, GFP_KERNEL)) |
1da177e4c Linux-2.6.12-rc2 |
439 |
#define free_mm(mm) (kmem_cache_free(mm_cachep, (mm))) |
4cb0e11b1 coredump_filter: ... |
440 441 442 443 444 445 446 447 448 449 450 |
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 |
451 |
#include <linux/init_task.h> |
858f09930 aio: ifdef fields... |
452 453 454 455 456 457 458 |
static void mm_init_aio(struct mm_struct *mm) { #ifdef CONFIG_AIO spin_lock_init(&mm->ioctx_lock); INIT_HLIST_HEAD(&mm->ioctx_list); #endif } |
fb0a685cb kernel/fork.c: fi... |
459 |
static struct mm_struct *mm_init(struct mm_struct *mm, struct task_struct *p) |
1da177e4c Linux-2.6.12-rc2 |
460 461 462 463 464 |
{ atomic_set(&mm->mm_users, 1); atomic_set(&mm->mm_count, 1); init_rwsem(&mm->mmap_sem); INIT_LIST_HEAD(&mm->mmlist); |
f8af4da3b ksm: the mm inter... |
465 466 |
mm->flags = (current->mm) ? (current->mm->flags & MMF_INIT_MASK) : default_dump_filter; |
999d9fc16 coredump: move mm... |
467 |
mm->core_state = NULL; |
1da177e4c Linux-2.6.12-rc2 |
468 |
mm->nr_ptes = 0; |
d559db086 mm: clean up mm_c... |
469 |
memset(&mm->rss_stat, 0, sizeof(mm->rss_stat)); |
1da177e4c Linux-2.6.12-rc2 |
470 |
spin_lock_init(&mm->page_table_lock); |
1da177e4c Linux-2.6.12-rc2 |
471 |
mm->free_area_cache = TASK_UNMAPPED_BASE; |
1363c3cd8 [PATCH] Avoiding ... |
472 |
mm->cached_hole_size = ~0UL; |
858f09930 aio: ifdef fields... |
473 |
mm_init_aio(mm); |
cf475ad28 cgroups: add an o... |
474 |
mm_init_owner(mm, p); |
3d5992d2a oom: add per-mm o... |
475 |
atomic_set(&mm->oom_disable_count, 0); |
1da177e4c Linux-2.6.12-rc2 |
476 477 478 |
if (likely(!mm_alloc_pgd(mm))) { mm->def_flags = 0; |
cddb8a5c1 mmu-notifiers: core |
479 |
mmu_notifier_mm_init(mm); |
1da177e4c Linux-2.6.12-rc2 |
480 481 |
return mm; } |
78fb74669 Memory controller... |
482 |
|
1da177e4c Linux-2.6.12-rc2 |
483 484 485 486 487 488 489 |
free_mm(mm); return NULL; } /* * Allocate and initialize an mm_struct. */ |
fb0a685cb kernel/fork.c: fi... |
490 |
struct mm_struct *mm_alloc(void) |
1da177e4c Linux-2.6.12-rc2 |
491 |
{ |
fb0a685cb kernel/fork.c: fi... |
492 |
struct mm_struct *mm; |
1da177e4c Linux-2.6.12-rc2 |
493 494 |
mm = allocate_mm(); |
de03c72cf mm: convert mm->c... |
495 496 497 498 |
if (!mm) return NULL; memset(mm, 0, sizeof(*mm)); |
6345d24da mm: Fix boot cras... |
499 500 |
mm_init_cpumask(mm); return mm_init(mm, current); |
1da177e4c Linux-2.6.12-rc2 |
501 502 503 504 505 506 507 |
} /* * 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... |
508 |
void __mmdrop(struct mm_struct *mm) |
1da177e4c Linux-2.6.12-rc2 |
509 510 511 512 |
{ BUG_ON(mm == &init_mm); mm_free_pgd(mm); destroy_context(mm); |
cddb8a5c1 mmu-notifiers: core |
513 |
mmu_notifier_mm_destroy(mm); |
e7a00c45f thp: add pmd_huge... |
514 515 516 |
#ifdef CONFIG_TRANSPARENT_HUGEPAGE VM_BUG_ON(mm->pmd_huge_pte); #endif |
1da177e4c Linux-2.6.12-rc2 |
517 518 |
free_mm(mm); } |
6d4e4c4fc KVM: Disallow for... |
519 |
EXPORT_SYMBOL_GPL(__mmdrop); |
1da177e4c Linux-2.6.12-rc2 |
520 521 522 523 524 525 |
/* * Decrement the use count and release all resources for an mm. */ void mmput(struct mm_struct *mm) { |
0ae26f1b3 [PATCH] mmput() m... |
526 |
might_sleep(); |
1da177e4c Linux-2.6.12-rc2 |
527 528 |
if (atomic_dec_and_test(&mm->mm_users)) { exit_aio(mm); |
1c2fb7a4c ksm: fix deadlock... |
529 |
ksm_exit(mm); |
ba76149f4 thp: khugepaged |
530 |
khugepaged_exit(mm); /* must run before exit_mmap */ |
1da177e4c Linux-2.6.12-rc2 |
531 |
exit_mmap(mm); |
925d1c401 procfs task exe s... |
532 |
set_mm_exe_file(mm, NULL); |
1da177e4c Linux-2.6.12-rc2 |
533 534 535 536 537 538 |
if (!list_empty(&mm->mmlist)) { spin_lock(&mmlist_lock); list_del(&mm->mmlist); spin_unlock(&mmlist_lock); } put_swap_token(mm); |
801460d0c task_struct clean... |
539 540 |
if (mm->binfmt) module_put(mm->binfmt->module); |
1da177e4c Linux-2.6.12-rc2 |
541 542 543 544 |
mmdrop(mm); } } EXPORT_SYMBOL_GPL(mmput); |
386460138 mm: extract exe_f... |
545 546 547 548 549 550 551 552 553 554 555 556 557 |
/* * We added or removed a vma mapping the executable. The vmas are only mapped * during exec and are not mapped with the mmap system call. * Callers must hold down_write() on the mm's mmap_sem for these */ void added_exe_file_vma(struct mm_struct *mm) { mm->num_exe_file_vmas++; } void removed_exe_file_vma(struct mm_struct *mm) { mm->num_exe_file_vmas--; |
fb0a685cb kernel/fork.c: fi... |
558 |
if ((mm->num_exe_file_vmas == 0) && mm->exe_file) { |
386460138 mm: extract exe_f... |
559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 |
fput(mm->exe_file); mm->exe_file = NULL; } } void set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file) { if (new_exe_file) get_file(new_exe_file); if (mm->exe_file) fput(mm->exe_file); mm->exe_file = new_exe_file; mm->num_exe_file_vmas = 0; } struct file *get_mm_exe_file(struct mm_struct *mm) { struct file *exe_file; /* We need mmap_sem to protect against races with removal of * VM_EXECUTABLE vmas */ down_read(&mm->mmap_sem); exe_file = mm->exe_file; if (exe_file) get_file(exe_file); up_read(&mm->mmap_sem); return exe_file; } static void dup_mm_exe_file(struct mm_struct *oldmm, struct mm_struct *newmm) { /* It's safe to write the exe_file pointer without exe_file_lock because * this is called during fork when the task is not yet in /proc */ newmm->exe_file = get_mm_exe_file(oldmm); } |
1da177e4c Linux-2.6.12-rc2 |
595 596 597 |
/** * get_task_mm - acquire a reference to the task's mm * |
246bb0b1d kill PF_BORROWED_... |
598 |
* Returns %NULL if the task has no mm. Checks PF_KTHREAD (meaning |
1da177e4c Linux-2.6.12-rc2 |
599 600 601 602 603 604 605 606 607 608 609 610 |
* 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_... |
611 |
if (task->flags & PF_KTHREAD) |
1da177e4c Linux-2.6.12-rc2 |
612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 |
mm = NULL; else atomic_inc(&mm->mm_users); } task_unlock(task); return mm; } EXPORT_SYMBOL_GPL(get_task_mm); /* 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) { struct completion *vfork_done = tsk->vfork_done; |
8141c7f3e Move "exit_robust... |
637 638 |
/* Get rid of any futexes when releasing the mm */ #ifdef CONFIG_FUTEX |
fc6b177de futex: Nullify ro... |
639 |
if (unlikely(tsk->robust_list)) { |
8141c7f3e Move "exit_robust... |
640 |
exit_robust_list(tsk); |
fc6b177de futex: Nullify ro... |
641 642 |
tsk->robust_list = NULL; } |
8141c7f3e Move "exit_robust... |
643 |
#ifdef CONFIG_COMPAT |
fc6b177de futex: Nullify ro... |
644 |
if (unlikely(tsk->compat_robust_list)) { |
8141c7f3e Move "exit_robust... |
645 |
compat_exit_robust_list(tsk); |
fc6b177de futex: Nullify ro... |
646 647 |
tsk->compat_robust_list = NULL; } |
8141c7f3e Move "exit_robust... |
648 |
#endif |
322a2c100 futex: Move exit_... |
649 650 |
if (unlikely(!list_empty(&tsk->pi_state_list))) exit_pi_state_list(tsk); |
8141c7f3e Move "exit_robust... |
651 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
652 653 654 655 656 657 658 659 |
/* Get rid of any cached register state */ deactivate_mm(tsk, mm); /* notify parent sleeping on vfork() */ if (vfork_done) { tsk->vfork_done = NULL; complete(vfork_done); } |
fec1d0115 [PATCH] Disable C... |
660 661 662 663 664 665 666 |
/* * If we're exiting normally, clear a user-space tid field if * requested. We leave this alone when dying by signal, to leave * the value intact in a core dump, and to save the unnecessary * trouble otherwise. Userland only wants this done for a sys_exit. */ |
9c8a8228d execve: must clea... |
667 668 669 670 671 672 673 674 675 676 677 |
if (tsk->clear_child_tid) { if (!(tsk->flags & PF_SIGNALED) && 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 |
678 |
tsk->clear_child_tid = NULL; |
1da177e4c Linux-2.6.12-rc2 |
679 680 |
} } |
a0a7ec308 [PATCH] unshare s... |
681 682 683 684 |
/* * Allocate a new mm structure and copy contents from the * mm structure of the passed in task structure. */ |
402b08622 s390: KVM prepara... |
685 |
struct mm_struct *dup_mm(struct task_struct *tsk) |
a0a7ec308 [PATCH] unshare s... |
686 687 688 689 690 691 692 693 694 695 696 697 |
{ struct mm_struct *mm, *oldmm = current->mm; int err; if (!oldmm) return NULL; mm = allocate_mm(); if (!mm) goto fail_nomem; memcpy(mm, oldmm, sizeof(*mm)); |
6345d24da mm: Fix boot cras... |
698 |
mm_init_cpumask(mm); |
a0a7ec308 [PATCH] unshare s... |
699 |
|
7602bdf2f [PATCH] new schem... |
700 701 702 |
/* Initializing for Swap token stuff */ mm->token_priority = 0; mm->last_interval = 0; |
e7a00c45f thp: add pmd_huge... |
703 704 705 |
#ifdef CONFIG_TRANSPARENT_HUGEPAGE mm->pmd_huge_pte = NULL; #endif |
78fb74669 Memory controller... |
706 |
if (!mm_init(mm, tsk)) |
a0a7ec308 [PATCH] unshare s... |
707 708 709 710 |
goto fail_nomem; if (init_new_context(tsk, mm)) goto fail_nocontext; |
925d1c401 procfs task exe s... |
711 |
dup_mm_exe_file(oldmm, mm); |
a0a7ec308 [PATCH] unshare s... |
712 713 714 715 716 717 |
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... |
718 719 |
if (mm->binfmt && !try_module_get(mm->binfmt->module)) goto free_pt; |
a0a7ec308 [PATCH] unshare s... |
720 721 722 |
return mm; free_pt: |
801460d0c task_struct clean... |
723 724 |
/* don't put binfmt in mmput, we haven't got module yet */ mm->binfmt = NULL; |
a0a7ec308 [PATCH] unshare s... |
725 726 727 728 729 730 731 732 733 734 735 736 737 738 |
mmput(mm); fail_nomem: return NULL; fail_nocontext: /* * If init_new_context() failed, we cannot use mmput() to free the mm * because it calls destroy_context() */ mm_free_pgd(mm); free_mm(mm); return NULL; } |
fb0a685cb kernel/fork.c: fi... |
739 |
static int copy_mm(unsigned long clone_flags, struct task_struct *tsk) |
1da177e4c Linux-2.6.12-rc2 |
740 |
{ |
fb0a685cb kernel/fork.c: fi... |
741 |
struct mm_struct *mm, *oldmm; |
1da177e4c Linux-2.6.12-rc2 |
742 743 744 745 |
int retval; tsk->min_flt = tsk->maj_flt = 0; tsk->nvcsw = tsk->nivcsw = 0; |
17406b82d softlockup: remov... |
746 747 748 |
#ifdef CONFIG_DETECT_HUNG_TASK tsk->last_switch_count = tsk->nvcsw + tsk->nivcsw; #endif |
1da177e4c Linux-2.6.12-rc2 |
749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 |
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; if (clone_flags & CLONE_VM) { atomic_inc(&oldmm->mm_users); mm = oldmm; |
1da177e4c Linux-2.6.12-rc2 |
765 766 767 768 |
goto good_mm; } retval = -ENOMEM; |
a0a7ec308 [PATCH] unshare s... |
769 |
mm = dup_mm(tsk); |
1da177e4c Linux-2.6.12-rc2 |
770 771 |
if (!mm) goto fail_nomem; |
1da177e4c Linux-2.6.12-rc2 |
772 |
good_mm: |
7602bdf2f [PATCH] new schem... |
773 774 775 |
/* Initializing for Swap token stuff */ mm->token_priority = 0; mm->last_interval = 0; |
3d5992d2a oom: add per-mm o... |
776 777 |
if (tsk->signal->oom_score_adj == OOM_SCORE_ADJ_MIN) atomic_inc(&mm->oom_disable_count); |
7602bdf2f [PATCH] new schem... |
778 |
|
1da177e4c Linux-2.6.12-rc2 |
779 780 781 |
tsk->mm = mm; tsk->active_mm = mm; return 0; |
1da177e4c Linux-2.6.12-rc2 |
782 783 |
fail_nomem: return retval; |
1da177e4c Linux-2.6.12-rc2 |
784 |
} |
a39bc5169 Uninline fork.c/e... |
785 |
static int copy_fs(unsigned long clone_flags, struct task_struct *tsk) |
1da177e4c Linux-2.6.12-rc2 |
786 |
{ |
498052bba New locking/refco... |
787 |
struct fs_struct *fs = current->fs; |
1da177e4c Linux-2.6.12-rc2 |
788 |
if (clone_flags & CLONE_FS) { |
498052bba New locking/refco... |
789 |
/* tsk->fs is already what we want */ |
2a4419b5b fs: fs_struct rwl... |
790 |
spin_lock(&fs->lock); |
498052bba New locking/refco... |
791 |
if (fs->in_exec) { |
2a4419b5b fs: fs_struct rwl... |
792 |
spin_unlock(&fs->lock); |
498052bba New locking/refco... |
793 794 795 |
return -EAGAIN; } fs->users++; |
2a4419b5b fs: fs_struct rwl... |
796 |
spin_unlock(&fs->lock); |
1da177e4c Linux-2.6.12-rc2 |
797 798 |
return 0; } |
498052bba New locking/refco... |
799 |
tsk->fs = copy_fs_struct(fs); |
1da177e4c Linux-2.6.12-rc2 |
800 801 802 803 |
if (!tsk->fs) return -ENOMEM; return 0; } |
fb0a685cb kernel/fork.c: fi... |
804 |
static int copy_files(unsigned long clone_flags, struct task_struct *tsk) |
a016f3389 [PATCH] unshare s... |
805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 |
{ 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... |
820 821 822 823 824 825 826 827 828 |
newf = dup_fd(oldf, &error); if (!newf) goto out; tsk->files = newf; error = 0; out: return error; } |
fadad878c kernel: add CLONE... |
829 |
static int copy_io(unsigned long clone_flags, struct task_struct *tsk) |
fd0928df9 ioprio: move io p... |
830 831 832 833 834 835 |
{ #ifdef CONFIG_BLOCK struct io_context *ioc = current->io_context; if (!ioc) return 0; |
fadad878c kernel: add CLONE... |
836 837 838 839 840 841 842 843 |
/* * Share io context with parent, if CLONE_IO is set */ if (clone_flags & CLONE_IO) { tsk->io_context = ioc_task_link(ioc); if (unlikely(!tsk->io_context)) return -ENOMEM; } else if (ioprio_valid(ioc->ioprio)) { |
fd0928df9 ioprio: move io p... |
844 845 846 |
tsk->io_context = alloc_io_context(GFP_KERNEL, -1); if (unlikely(!tsk->io_context)) return -ENOMEM; |
fd0928df9 ioprio: move io p... |
847 848 849 850 851 |
tsk->io_context->ioprio = ioc->ioprio; } #endif return 0; } |
a39bc5169 Uninline fork.c/e... |
852 |
static int copy_sighand(unsigned long clone_flags, struct task_struct *tsk) |
1da177e4c Linux-2.6.12-rc2 |
853 854 |
{ struct sighand_struct *sig; |
60348802e fork.c: cleanup f... |
855 |
if (clone_flags & CLONE_SIGHAND) { |
1da177e4c Linux-2.6.12-rc2 |
856 857 858 859 |
atomic_inc(¤t->sighand->count); return 0; } sig = kmem_cache_alloc(sighand_cachep, GFP_KERNEL); |
e56d09031 [PATCH] RCU signa... |
860 |
rcu_assign_pointer(tsk->sighand, sig); |
1da177e4c Linux-2.6.12-rc2 |
861 862 |
if (!sig) return -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
863 864 865 866 |
atomic_set(&sig->count, 1); memcpy(sig->action, current->sighand->action, sizeof(sig->action)); return 0; } |
a7e5328a0 [PATCH] cleanup _... |
867 |
void __cleanup_sighand(struct sighand_struct *sighand) |
c81addc9d [PATCH] rename __... |
868 |
{ |
c81addc9d [PATCH] rename __... |
869 870 871 |
if (atomic_dec_and_test(&sighand->count)) kmem_cache_free(sighand_cachep, sighand); } |
f06febc96 timers: fix itime... |
872 873 874 875 876 877 |
/* * Initialize POSIX timer handling for a thread group. */ static void posix_cpu_timers_init_group(struct signal_struct *sig) { |
78d7d407b kernel core: use ... |
878 |
unsigned long cpu_limit; |
f06febc96 timers: fix itime... |
879 880 |
/* Thread group counters. */ thread_group_cputime_init(sig); |
78d7d407b kernel core: use ... |
881 882 883 |
cpu_limit = ACCESS_ONCE(sig->rlim[RLIMIT_CPU].rlim_cur); if (cpu_limit != RLIM_INFINITY) { sig->cputime_expires.prof_exp = secs_to_cputime(cpu_limit); |
6279a751f posix-timers: fix... |
884 885 |
sig->cputimer.running = 1; } |
f06febc96 timers: fix itime... |
886 887 888 889 890 |
/* The timer lists. */ INIT_LIST_HEAD(&sig->cpu_timers[0]); INIT_LIST_HEAD(&sig->cpu_timers[1]); INIT_LIST_HEAD(&sig->cpu_timers[2]); } |
a39bc5169 Uninline fork.c/e... |
891 |
static int copy_signal(unsigned long clone_flags, struct task_struct *tsk) |
1da177e4c Linux-2.6.12-rc2 |
892 893 |
{ struct signal_struct *sig; |
1da177e4c Linux-2.6.12-rc2 |
894 |
|
4ab6c0833 clone(): fix race... |
895 |
if (clone_flags & CLONE_THREAD) |
490dea45d itimers: remove t... |
896 |
return 0; |
490dea45d itimers: remove t... |
897 |
|
a56704ef6 copy_signal() cle... |
898 |
sig = kmem_cache_zalloc(signal_cachep, GFP_KERNEL); |
1da177e4c Linux-2.6.12-rc2 |
899 900 901 |
tsk->signal = sig; if (!sig) return -ENOMEM; |
b3ac022cb proc: turn signal... |
902 |
sig->nr_threads = 1; |
1da177e4c Linux-2.6.12-rc2 |
903 |
atomic_set(&sig->live, 1); |
b3ac022cb proc: turn signal... |
904 |
atomic_set(&sig->sigcnt, 1); |
1da177e4c Linux-2.6.12-rc2 |
905 |
init_waitqueue_head(&sig->wait_chldexit); |
b3bfa0cba signals: protect ... |
906 907 |
if (clone_flags & CLONE_NEWPID) sig->flags |= SIGNAL_UNKILLABLE; |
db51aeccd signals: microopt... |
908 |
sig->curr_target = tsk; |
1da177e4c Linux-2.6.12-rc2 |
909 910 |
init_sigpending(&sig->shared_pending); INIT_LIST_HEAD(&sig->posix_timers); |
c9cb2e3d7 [PATCH] hrtimers:... |
911 |
hrtimer_init(&sig->real_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
1da177e4c Linux-2.6.12-rc2 |
912 |
sig->real_timer.function = it_real_fn; |
1da177e4c Linux-2.6.12-rc2 |
913 |
|
1da177e4c Linux-2.6.12-rc2 |
914 915 916 |
task_lock(current->group_leader); memcpy(sig->rlim, current->signal->rlim, sizeof sig->rlim); task_unlock(current->group_leader); |
6279a751f posix-timers: fix... |
917 |
posix_cpu_timers_init_group(sig); |
522ed7767 Audit: add TTY in... |
918 |
tty_audit_fork(sig); |
5091faa44 sched: Add 'autog... |
919 |
sched_autogroup_fork(sig); |
522ed7767 Audit: add TTY in... |
920 |
|
4714d1d32 cgroups: read-wri... |
921 922 923 |
#ifdef CONFIG_CGROUPS init_rwsem(&sig->threadgroup_fork_lock); #endif |
28b83c519 oom: move oom_adj... |
924 |
sig->oom_adj = current->signal->oom_adj; |
a63d83f42 oom: badness heur... |
925 |
sig->oom_score_adj = current->signal->oom_score_adj; |
dabb16f63 oom: allow a non-... |
926 |
sig->oom_score_adj_min = current->signal->oom_score_adj_min; |
28b83c519 oom: move oom_adj... |
927 |
|
9b1bf12d5 signals: move cre... |
928 |
mutex_init(&sig->cred_guard_mutex); |
1da177e4c Linux-2.6.12-rc2 |
929 930 |
return 0; } |
a39bc5169 Uninline fork.c/e... |
931 |
static void copy_flags(unsigned long clone_flags, struct task_struct *p) |
1da177e4c Linux-2.6.12-rc2 |
932 933 |
{ unsigned long new_flags = p->flags; |
21aa9af03 sched: add hooks ... |
934 |
new_flags &= ~(PF_SUPERPRIV | PF_WQ_WORKER); |
1da177e4c Linux-2.6.12-rc2 |
935 |
new_flags |= PF_FORKNOEXEC; |
09a05394f tracehook: clone |
936 |
new_flags |= PF_STARTING; |
1da177e4c Linux-2.6.12-rc2 |
937 |
p->flags = new_flags; |
2e1318956 freezer: prevent ... |
938 |
clear_freeze_flag(p); |
1da177e4c Linux-2.6.12-rc2 |
939 |
} |
17da2bd90 [CVE-2009-0029] S... |
940 |
SYSCALL_DEFINE1(set_tid_address, int __user *, tidptr) |
1da177e4c Linux-2.6.12-rc2 |
941 942 |
{ current->clear_child_tid = tidptr; |
b488893a3 pid namespaces: c... |
943 |
return task_pid_vnr(current); |
1da177e4c Linux-2.6.12-rc2 |
944 |
} |
a39bc5169 Uninline fork.c/e... |
945 |
static void rt_mutex_init_task(struct task_struct *p) |
23f78d4a0 [PATCH] pi-futex:... |
946 |
{ |
1d6154825 sched: Convert pi... |
947 |
raw_spin_lock_init(&p->pi_lock); |
e29e175b0 [PATCH] initialis... |
948 |
#ifdef CONFIG_RT_MUTEXES |
732375c6a plist: Remove the... |
949 |
plist_head_init(&p->pi_waiters); |
23f78d4a0 [PATCH] pi-futex:... |
950 |
p->pi_blocked_on = NULL; |
23f78d4a0 [PATCH] pi-futex:... |
951 952 |
#endif } |
cf475ad28 cgroups: add an o... |
953 954 955 956 957 958 |
#ifdef CONFIG_MM_OWNER void mm_init_owner(struct mm_struct *mm, struct task_struct *p) { mm->owner = p; } #endif /* CONFIG_MM_OWNER */ |
1da177e4c Linux-2.6.12-rc2 |
959 |
/* |
f06febc96 timers: fix itime... |
960 961 962 963 964 965 966 967 968 969 970 971 972 |
* Initialize POSIX timer handling for a single task. */ static void posix_cpu_timers_init(struct task_struct *tsk) { tsk->cputime_expires.prof_exp = cputime_zero; tsk->cputime_expires.virt_exp = cputime_zero; 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]); } /* |
1da177e4c Linux-2.6.12-rc2 |
973 974 975 976 977 978 979 |
* 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. */ |
36c8b5868 [PATCH] sched: cl... |
980 981 982 983 |
static struct task_struct *copy_process(unsigned long clone_flags, unsigned long stack_start, struct pt_regs *regs, unsigned long stack_size, |
36c8b5868 [PATCH] sched: cl... |
984 |
int __user *child_tidptr, |
09a05394f tracehook: clone |
985 986 |
struct pid *pid, int trace) |
1da177e4c Linux-2.6.12-rc2 |
987 988 |
{ int retval; |
a24efe62d kernel/fork.c: re... |
989 |
struct task_struct *p; |
b4f48b636 Task Control Grou... |
990 |
int cgroup_callbacks_done = 0; |
1da177e4c Linux-2.6.12-rc2 |
991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 |
if ((clone_flags & (CLONE_NEWNS|CLONE_FS)) == (CLONE_NEWNS|CLONE_FS)) return ERR_PTR(-EINVAL); /* * 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... |
1009 1010 1011 1012 1013 1014 1015 1016 1017 |
/* * 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); |
1da177e4c Linux-2.6.12-rc2 |
1018 1019 1020 1021 1022 1023 1024 1025 |
retval = security_task_create(clone_flags); if (retval) goto fork_out; retval = -ENOMEM; p = dup_task_struct(current); if (!p) goto fork_out; |
f7e8b616e function-graph: m... |
1026 |
ftrace_graph_init_task(p); |
bea493a03 [PATCH] rt-mutex:... |
1027 |
rt_mutex_init_task(p); |
d12c1a379 lockdep: fix kern... |
1028 |
#ifdef CONFIG_PROVE_LOCKING |
de30a2b35 [PATCH] lockdep: ... |
1029 1030 1031 |
DEBUG_LOCKS_WARN_ON(!p->hardirqs_enabled); DEBUG_LOCKS_WARN_ON(!p->softirqs_enabled); #endif |
1da177e4c Linux-2.6.12-rc2 |
1032 |
retval = -EAGAIN; |
3b11a1dec CRED: Differentia... |
1033 |
if (atomic_read(&p->real_cred->user->processes) >= |
78d7d407b kernel core: use ... |
1034 |
task_rlimit(p, RLIMIT_NPROC)) { |
1da177e4c Linux-2.6.12-rc2 |
1035 |
if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RESOURCE) && |
18b6e0414 User namespaces: ... |
1036 |
p->real_cred->user != INIT_USER) |
1da177e4c Linux-2.6.12-rc2 |
1037 1038 |
goto bad_fork_free; } |
72fa59970 move RLIMIT_NPROC... |
1039 |
current->flags &= ~PF_NPROC_EXCEEDED; |
1da177e4c Linux-2.6.12-rc2 |
1040 |
|
f1752eec6 CRED: Detach the ... |
1041 1042 1043 |
retval = copy_creds(p, clone_flags); if (retval < 0) goto bad_fork_free; |
1da177e4c Linux-2.6.12-rc2 |
1044 1045 1046 1047 1048 1049 |
/* * 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 ... |
1050 |
retval = -EAGAIN; |
1da177e4c Linux-2.6.12-rc2 |
1051 1052 |
if (nr_threads >= max_threads) goto bad_fork_cleanup_count; |
a1261f546 [PATCH] m68k: int... |
1053 |
if (!try_module_get(task_thread_info(p)->exec_domain->module)) |
1da177e4c Linux-2.6.12-rc2 |
1054 |
goto bad_fork_cleanup_count; |
1da177e4c Linux-2.6.12-rc2 |
1055 |
p->did_exec = 0; |
ca74e92b4 [PATCH] per-task-... |
1056 |
delayacct_tsk_init(p); /* Must remain after dup_task_struct() */ |
1da177e4c Linux-2.6.12-rc2 |
1057 |
copy_flags(clone_flags, p); |
1da177e4c Linux-2.6.12-rc2 |
1058 1059 |
INIT_LIST_HEAD(&p->children); INIT_LIST_HEAD(&p->sibling); |
f41d911f8 rcu: Merge preemp... |
1060 |
rcu_copy_process(p); |
1da177e4c Linux-2.6.12-rc2 |
1061 1062 |
p->vfork_done = NULL; spin_lock_init(&p->alloc_lock); |
1da177e4c Linux-2.6.12-rc2 |
1063 |
|
1da177e4c Linux-2.6.12-rc2 |
1064 1065 1066 1067 |
init_sigpending(&p->pending); p->utime = cputime_zero; p->stime = cputime_zero; |
9ac52315d sched: guest CPU ... |
1068 |
p->gtime = cputime_zero; |
c66f08be7 Add scaled time t... |
1069 1070 |
p->utimescaled = cputime_zero; p->stimescaled = cputime_zero; |
d99ca3b97 sched, cputime: C... |
1071 |
#ifndef CONFIG_VIRT_CPU_ACCOUNTING |
73a2bcb0e sched: keep utime... |
1072 |
p->prev_utime = cputime_zero; |
9301899be sched: fix /proc/... |
1073 |
p->prev_stime = cputime_zero; |
d99ca3b97 sched, cputime: C... |
1074 |
#endif |
a3a2e76c7 mm: avoid null-po... |
1075 1076 1077 |
#if defined(SPLIT_RSS_COUNTING) memset(&p->rss_stat, 0, sizeof(p->rss_stat)); #endif |
172ba844a sched: update del... |
1078 |
|
6976675d9 hrtimer: create a... |
1079 |
p->default_timer_slack_ns = current->timer_slack_ns; |
5995477ab task IO accountin... |
1080 |
task_io_accounting_init(&p->ioac); |
1da177e4c Linux-2.6.12-rc2 |
1081 |
acct_clear_integrals(p); |
f06febc96 timers: fix itime... |
1082 |
posix_cpu_timers_init(p); |
1da177e4c Linux-2.6.12-rc2 |
1083 |
|
1da177e4c Linux-2.6.12-rc2 |
1084 |
do_posix_clock_monotonic_gettime(&p->start_time); |
924b42d5a Use boot based ti... |
1085 1086 |
p->real_start_time = p->start_time; monotonic_to_bootbased(&p->real_start_time); |
1da177e4c Linux-2.6.12-rc2 |
1087 |
p->io_context = NULL; |
1da177e4c Linux-2.6.12-rc2 |
1088 |
p->audit_context = NULL; |
4714d1d32 cgroups: read-wri... |
1089 1090 |
if (clone_flags & CLONE_THREAD) threadgroup_fork_read_lock(current); |
b4f48b636 Task Control Grou... |
1091 |
cgroup_fork(p); |
1da177e4c Linux-2.6.12-rc2 |
1092 |
#ifdef CONFIG_NUMA |
846a16bf0 mempolicy: rename... |
1093 |
p->mempolicy = mpol_dup(p->mempolicy); |
fb0a685cb kernel/fork.c: fi... |
1094 1095 1096 1097 1098 |
if (IS_ERR(p->mempolicy)) { retval = PTR_ERR(p->mempolicy); p->mempolicy = NULL; goto bad_fork_cleanup_cgroup; } |
c61afb181 [PATCH] cpuset me... |
1099 |
mpol_fix_fork_child_flag(p); |
1da177e4c Linux-2.6.12-rc2 |
1100 |
#endif |
778d3b0ff cpusets: randomiz... |
1101 1102 1103 1104 |
#ifdef CONFIG_CPUSETS p->cpuset_mem_spread_rotor = NUMA_NO_NODE; p->cpuset_slab_spread_rotor = NUMA_NO_NODE; #endif |
de30a2b35 [PATCH] lockdep: ... |
1105 1106 |
#ifdef CONFIG_TRACE_IRQFLAGS p->irq_events = 0; |
b36e4758d [ARM] Fix kernel/... |
1107 1108 1109 |
#ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW p->hardirqs_enabled = 1; #else |
de30a2b35 [PATCH] lockdep: ... |
1110 |
p->hardirqs_enabled = 0; |
b36e4758d [ARM] Fix kernel/... |
1111 |
#endif |
de30a2b35 [PATCH] lockdep: ... |
1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 |
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 |
fbb9ce953 [PATCH] lockdep: ... |
1124 1125 1126 1127 1128 |
#ifdef CONFIG_LOCKDEP p->lockdep_depth = 0; /* no locks held yet */ p->curr_chain_key = 0; p->lockdep_recursion = 0; #endif |
1da177e4c Linux-2.6.12-rc2 |
1129 |
|
408894ee4 [PATCH] mutex sub... |
1130 1131 1132 |
#ifdef CONFIG_DEBUG_MUTEXES p->blocked_on = NULL; /* not blocked yet */ #endif |
569b846df memcg: coalesce u... |
1133 1134 1135 1136 |
#ifdef CONFIG_CGROUP_MEM_RES_CTLR p->memcg_batch.do_batch = 0; p->memcg_batch.memcg = NULL; #endif |
0f4814065 x86, ptrace: add ... |
1137 |
|
3c90e6e99 sched: fix copy_n... |
1138 |
/* Perform scheduler related setup. Assign this task to a CPU. */ |
3e51e3edf sched: Remove unu... |
1139 |
sched_fork(p); |
6ab423e0e perf_counter: Pro... |
1140 |
|
cdd6c482c perf: Do the big ... |
1141 |
retval = perf_event_init_task(p); |
6ab423e0e perf_counter: Pro... |
1142 1143 |
if (retval) goto bad_fork_cleanup_policy; |
fb0a685cb kernel/fork.c: fi... |
1144 1145 |
retval = audit_alloc(p); if (retval) |
f1752eec6 CRED: Detach the ... |
1146 |
goto bad_fork_cleanup_policy; |
1da177e4c Linux-2.6.12-rc2 |
1147 |
/* copy all the process information */ |
fb0a685cb kernel/fork.c: fi... |
1148 1149 |
retval = copy_semundo(clone_flags, p); if (retval) |
1da177e4c Linux-2.6.12-rc2 |
1150 |
goto bad_fork_cleanup_audit; |
fb0a685cb kernel/fork.c: fi... |
1151 1152 |
retval = copy_files(clone_flags, p); if (retval) |
1da177e4c Linux-2.6.12-rc2 |
1153 |
goto bad_fork_cleanup_semundo; |
fb0a685cb kernel/fork.c: fi... |
1154 1155 |
retval = copy_fs(clone_flags, p); if (retval) |
1da177e4c Linux-2.6.12-rc2 |
1156 |
goto bad_fork_cleanup_files; |
fb0a685cb kernel/fork.c: fi... |
1157 1158 |
retval = copy_sighand(clone_flags, p); if (retval) |
1da177e4c Linux-2.6.12-rc2 |
1159 |
goto bad_fork_cleanup_fs; |
fb0a685cb kernel/fork.c: fi... |
1160 1161 |
retval = copy_signal(clone_flags, p); if (retval) |
1da177e4c Linux-2.6.12-rc2 |
1162 |
goto bad_fork_cleanup_sighand; |
fb0a685cb kernel/fork.c: fi... |
1163 1164 |
retval = copy_mm(clone_flags, p); if (retval) |
1da177e4c Linux-2.6.12-rc2 |
1165 |
goto bad_fork_cleanup_signal; |
fb0a685cb kernel/fork.c: fi... |
1166 1167 |
retval = copy_namespaces(clone_flags, p); if (retval) |
d84f4f992 CRED: Inaugurate ... |
1168 |
goto bad_fork_cleanup_mm; |
fb0a685cb kernel/fork.c: fi... |
1169 1170 |
retval = copy_io(clone_flags, p); if (retval) |
fd0928df9 ioprio: move io p... |
1171 |
goto bad_fork_cleanup_namespaces; |
6f2c55b84 Simplify copy_thr... |
1172 |
retval = copy_thread(clone_flags, stack_start, stack_size, p, regs); |
1da177e4c Linux-2.6.12-rc2 |
1173 |
if (retval) |
fd0928df9 ioprio: move io p... |
1174 |
goto bad_fork_cleanup_io; |
1da177e4c Linux-2.6.12-rc2 |
1175 |
|
425fb2b4b pid namespaces: m... |
1176 1177 |
if (pid != &init_struct_pid) { retval = -ENOMEM; |
61bce0f13 pid: generalize t... |
1178 |
pid = alloc_pid(p->nsproxy->pid_ns); |
425fb2b4b pid namespaces: m... |
1179 |
if (!pid) |
fd0928df9 ioprio: move io p... |
1180 |
goto bad_fork_cleanup_io; |
425fb2b4b pid namespaces: m... |
1181 1182 1183 1184 1185 1186 |
} p->pid = pid_nr(pid); p->tgid = p->pid; if (clone_flags & CLONE_THREAD) p->tgid = current->tgid; |
1da177e4c Linux-2.6.12-rc2 |
1187 1188 1189 1190 |
p->set_child_tid = (clone_flags & CLONE_CHILD_SETTID) ? child_tidptr : NULL; /* * Clear TID on mm_release()? */ |
fb0a685cb kernel/fork.c: fi... |
1191 |
p->clear_child_tid = (clone_flags & CLONE_CHILD_CLEARTID) ? child_tidptr : NULL; |
73c101011 block: initial pa... |
1192 1193 1194 |
#ifdef CONFIG_BLOCK p->plug = NULL; #endif |
42b2dd0a0 Shrink task_struc... |
1195 |
#ifdef CONFIG_FUTEX |
8f17d3a50 [PATCH] lightweig... |
1196 1197 1198 1199 |
p->robust_list = NULL; #ifdef CONFIG_COMPAT p->compat_robust_list = NULL; #endif |
c87e2837b [PATCH] pi-futex:... |
1200 1201 |
INIT_LIST_HEAD(&p->pi_state_list); p->pi_state_cache = NULL; |
42b2dd0a0 Shrink task_struc... |
1202 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
1203 |
/* |
f9a3879ab [PATCH] Fix sigal... |
1204 1205 1206 1207 1208 1209 |
* sigaltstack should be cleared when sharing the same VM */ if ((clone_flags & (CLONE_VM|CLONE_VFORK)) == CLONE_VM) p->sas_ss_sp = p->sas_ss_size = 0; /* |
6580807da ptrace: copy_proc... |
1210 1211 |
* Syscall tracing and stepping should be turned off in the * child regardless of CLONE_PTRACE. |
1da177e4c Linux-2.6.12-rc2 |
1212 |
*/ |
6580807da ptrace: copy_proc... |
1213 |
user_disable_single_step(p); |
1da177e4c Linux-2.6.12-rc2 |
1214 |
clear_tsk_thread_flag(p, TIF_SYSCALL_TRACE); |
ed75e8d58 [PATCH] UML Suppo... |
1215 1216 1217 |
#ifdef TIF_SYSCALL_EMU clear_tsk_thread_flag(p, TIF_SYSCALL_EMU); #endif |
9745512ce sched: latencytop... |
1218 |
clear_all_latency_tracing(p); |
1da177e4c Linux-2.6.12-rc2 |
1219 |
|
1da177e4c Linux-2.6.12-rc2 |
1220 1221 1222 1223 |
/* ok, now we should be set up.. */ p->exit_signal = (clone_flags & CLONE_THREAD) ? -1 : (clone_flags & CSIGNAL); p->pdeath_signal = 0; p->exit_state = 0; |
1da177e4c Linux-2.6.12-rc2 |
1224 1225 1226 1227 1228 |
/* * Ok, make it visible to the rest of the system. * We dont wake it up yet. */ p->group_leader = p; |
47e65328a [PATCH] pids: kil... |
1229 |
INIT_LIST_HEAD(&p->thread_group); |
1da177e4c Linux-2.6.12-rc2 |
1230 |
|
b4f48b636 Task Control Grou... |
1231 1232 1233 1234 1235 |
/* Now that the task is set up, run cgroup callbacks if * necessary. We need to run them before the task is visible * on the tasklist. */ cgroup_fork_callbacks(p); cgroup_callbacks_done = 1; |
1da177e4c Linux-2.6.12-rc2 |
1236 1237 |
/* Need tasklist lock for parent etc handling! */ write_lock_irq(&tasklist_lock); |
1da177e4c Linux-2.6.12-rc2 |
1238 |
/* CLONE_PARENT re-uses the old parent */ |
2d5516cbb copy_process: fix... |
1239 |
if (clone_flags & (CLONE_PARENT|CLONE_THREAD)) { |
1da177e4c Linux-2.6.12-rc2 |
1240 |
p->real_parent = current->real_parent; |
2d5516cbb copy_process: fix... |
1241 1242 |
p->parent_exec_id = current->parent_exec_id; } else { |
1da177e4c Linux-2.6.12-rc2 |
1243 |
p->real_parent = current; |
2d5516cbb copy_process: fix... |
1244 1245 |
p->parent_exec_id = current->self_exec_id; } |
1da177e4c Linux-2.6.12-rc2 |
1246 |
|
3f17da699 [PATCH] fix kill_... |
1247 |
spin_lock(¤t->sighand->siglock); |
4a2c7a783 [PATCH] make fork... |
1248 1249 1250 1251 1252 1253 1254 1255 |
/* * 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... |
1256 |
*/ |
23ff44402 whitespace fixes:... |
1257 |
recalc_sigpending(); |
4a2c7a783 [PATCH] make fork... |
1258 1259 1260 1261 |
if (signal_pending(current)) { spin_unlock(¤t->sighand->siglock); write_unlock_irq(&tasklist_lock); retval = -ERESTARTNOINTR; |
f7e8b616e function-graph: m... |
1262 |
goto bad_fork_free_pid; |
4a2c7a783 [PATCH] make fork... |
1263 |
} |
1da177e4c Linux-2.6.12-rc2 |
1264 |
if (clone_flags & CLONE_THREAD) { |
b3ac022cb proc: turn signal... |
1265 |
current->signal->nr_threads++; |
4ab6c0833 clone(): fix race... |
1266 |
atomic_inc(¤t->signal->live); |
b3ac022cb proc: turn signal... |
1267 |
atomic_inc(¤t->signal->sigcnt); |
1da177e4c Linux-2.6.12-rc2 |
1268 |
p->group_leader = current->group_leader; |
47e65328a [PATCH] pids: kil... |
1269 |
list_add_tail_rcu(&p->thread_group, &p->group_leader->thread_group); |
1da177e4c Linux-2.6.12-rc2 |
1270 |
} |
73b9ebfe1 [PATCH] pidhash: ... |
1271 |
if (likely(p->pid)) { |
4b9d33e6d ptrace: kill clon... |
1272 |
ptrace_init_task(p, (clone_flags & CLONE_PTRACE) || trace); |
73b9ebfe1 [PATCH] pidhash: ... |
1273 1274 |
if (thread_group_leader(p)) { |
45a68628d pid: remove the c... |
1275 |
if (is_child_reaper(pid)) |
30e49c263 pid namespaces: a... |
1276 |
p->nsproxy->pid_ns->child_reaper = p; |
73b9ebfe1 [PATCH] pidhash: ... |
1277 |
|
fea9d1755 ITIMER_REAL: conv... |
1278 |
p->signal->leader_pid = pid; |
9c9f4ded9 tty: Add a kref c... |
1279 |
p->signal->tty = tty_kref_get(current->signal->tty); |
5cd17569f fix clone(CLONE_N... |
1280 1281 |
attach_pid(p, PIDTYPE_PGID, task_pgrp(current)); attach_pid(p, PIDTYPE_SID, task_session(current)); |
9cd80bbb0 do_wait() optimiz... |
1282 |
list_add_tail(&p->sibling, &p->real_parent->children); |
5e85d4abe [PATCH] task: Mak... |
1283 |
list_add_tail_rcu(&p->tasks, &init_task.tasks); |
909ea9646 core: Replace __g... |
1284 |
__this_cpu_inc(process_counts); |
73b9ebfe1 [PATCH] pidhash: ... |
1285 |
} |
85868995d Use struct pid pa... |
1286 |
attach_pid(p, PIDTYPE_PID, pid); |
73b9ebfe1 [PATCH] pidhash: ... |
1287 |
nr_threads++; |
1da177e4c Linux-2.6.12-rc2 |
1288 |
} |
1da177e4c Linux-2.6.12-rc2 |
1289 |
total_forks++; |
3f17da699 [PATCH] fix kill_... |
1290 |
spin_unlock(¤t->sighand->siglock); |
1da177e4c Linux-2.6.12-rc2 |
1291 |
write_unlock_irq(&tasklist_lock); |
c13cf856c [PATCH] fork.c: p... |
1292 |
proc_fork_connector(p); |
817929ec2 Task Control Grou... |
1293 |
cgroup_post_fork(p); |
4714d1d32 cgroups: read-wri... |
1294 1295 |
if (clone_flags & CLONE_THREAD) threadgroup_fork_read_unlock(current); |
cdd6c482c perf: Do the big ... |
1296 |
perf_event_fork(p); |
1da177e4c Linux-2.6.12-rc2 |
1297 |
return p; |
425fb2b4b pid namespaces: m... |
1298 1299 1300 |
bad_fork_free_pid: if (pid != &init_struct_pid) free_pid(pid); |
fd0928df9 ioprio: move io p... |
1301 |
bad_fork_cleanup_io: |
b69f22920 block: Fix io_con... |
1302 1303 |
if (p->io_context) exit_io_context(p); |
ab516013a [PATCH] namespace... |
1304 |
bad_fork_cleanup_namespaces: |
444f378b2 Revert "[PATCH] n... |
1305 |
exit_task_namespaces(p); |
1da177e4c Linux-2.6.12-rc2 |
1306 |
bad_fork_cleanup_mm: |
3d5992d2a oom: add per-mm o... |
1307 1308 1309 1310 1311 |
if (p->mm) { task_lock(p); if (p->signal->oom_score_adj == OOM_SCORE_ADJ_MIN) atomic_dec(&p->mm->oom_disable_count); task_unlock(p); |
1da177e4c Linux-2.6.12-rc2 |
1312 |
mmput(p->mm); |
3d5992d2a oom: add per-mm o... |
1313 |
} |
1da177e4c Linux-2.6.12-rc2 |
1314 |
bad_fork_cleanup_signal: |
4ab6c0833 clone(): fix race... |
1315 |
if (!(clone_flags & CLONE_THREAD)) |
1c5354de9 sched: Move sched... |
1316 |
free_signal_struct(p->signal); |
1da177e4c Linux-2.6.12-rc2 |
1317 |
bad_fork_cleanup_sighand: |
a7e5328a0 [PATCH] cleanup _... |
1318 |
__cleanup_sighand(p->sighand); |
1da177e4c Linux-2.6.12-rc2 |
1319 1320 1321 1322 1323 1324 1325 1326 |
bad_fork_cleanup_fs: exit_fs(p); /* blocking */ bad_fork_cleanup_files: exit_files(p); /* blocking */ bad_fork_cleanup_semundo: exit_sem(p); bad_fork_cleanup_audit: audit_free(p); |
1da177e4c Linux-2.6.12-rc2 |
1327 |
bad_fork_cleanup_policy: |
cdd6c482c perf: Do the big ... |
1328 |
perf_event_free_task(p); |
1da177e4c Linux-2.6.12-rc2 |
1329 |
#ifdef CONFIG_NUMA |
f0be3d32b mempolicy: rename... |
1330 |
mpol_put(p->mempolicy); |
b4f48b636 Task Control Grou... |
1331 |
bad_fork_cleanup_cgroup: |
1da177e4c Linux-2.6.12-rc2 |
1332 |
#endif |
4714d1d32 cgroups: read-wri... |
1333 1334 |
if (clone_flags & CLONE_THREAD) threadgroup_fork_read_unlock(current); |
b4f48b636 Task Control Grou... |
1335 |
cgroup_exit(p, cgroup_callbacks_done); |
35df17c57 [PATCH] task dela... |
1336 |
delayacct_tsk_free(p); |
a1261f546 [PATCH] m68k: int... |
1337 |
module_put(task_thread_info(p)->exec_domain->module); |
1da177e4c Linux-2.6.12-rc2 |
1338 |
bad_fork_cleanup_count: |
d84f4f992 CRED: Inaugurate ... |
1339 |
atomic_dec(&p->cred->user->processes); |
e0e817392 CRED: Add some co... |
1340 |
exit_creds(p); |
1da177e4c Linux-2.6.12-rc2 |
1341 1342 |
bad_fork_free: free_task(p); |
fe7d37d1f [PATCH] copy_proc... |
1343 1344 |
fork_out: return ERR_PTR(retval); |
1da177e4c Linux-2.6.12-rc2 |
1345 |
} |
6b2fb3c65 idle_regs() must ... |
1346 |
noinline struct pt_regs * __cpuinit __attribute__((weak)) idle_regs(struct pt_regs *regs) |
1da177e4c Linux-2.6.12-rc2 |
1347 1348 1349 1350 |
{ memset(regs, 0, sizeof(struct pt_regs)); return regs; } |
f106eee10 pids: fix fork_id... |
1351 1352 1353 1354 1355 1356 1357 1358 1359 |
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; } } |
9abcf40b1 [PATCH] fork_idle... |
1360 |
struct task_struct * __cpuinit fork_idle(int cpu) |
1da177e4c Linux-2.6.12-rc2 |
1361 |
{ |
36c8b5868 [PATCH] sched: cl... |
1362 |
struct task_struct *task; |
1da177e4c Linux-2.6.12-rc2 |
1363 |
struct pt_regs regs; |
30e49c263 pid namespaces: a... |
1364 |
task = copy_process(CLONE_VM, 0, idle_regs(®s), 0, NULL, |
09a05394f tracehook: clone |
1365 |
&init_struct_pid, 0); |
f106eee10 pids: fix fork_id... |
1366 1367 |
if (!IS_ERR(task)) { init_idle_pids(task->pids); |
753ca4f31 [PATCH] fix copy_... |
1368 |
init_idle(task, cpu); |
f106eee10 pids: fix fork_id... |
1369 |
} |
73b9ebfe1 [PATCH] pidhash: ... |
1370 |
|
1da177e4c Linux-2.6.12-rc2 |
1371 1372 |
return task; } |
1da177e4c Linux-2.6.12-rc2 |
1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 |
/* * 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. */ long do_fork(unsigned long clone_flags, unsigned long stack_start, struct pt_regs *regs, unsigned long stack_size, int __user *parent_tidptr, int __user *child_tidptr) { struct task_struct *p; int trace = 0; |
92476d7fc [PATCH] pidhash: ... |
1388 |
long nr; |
1da177e4c Linux-2.6.12-rc2 |
1389 |
|
bdff746a3 clone: prepare to... |
1390 |
/* |
18b6e0414 User namespaces: ... |
1391 1392 1393 1394 1395 1396 1397 1398 1399 |
* Do some preliminary argument and permissions checking before we * actually start allocating stuff */ if (clone_flags & CLONE_NEWUSER) { if (clone_flags & CLONE_THREAD) return -EINVAL; /* hopefully this check will go away when userns support is * complete */ |
7657d9049 user namespaces: ... |
1400 1401 |
if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SETUID) || !capable(CAP_SETGID)) |
18b6e0414 User namespaces: ... |
1402 1403 1404 1405 |
return -EPERM; } /* |
4b9d33e6d ptrace: kill clon... |
1406 1407 1408 1409 |
* 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 |
1410 |
*/ |
4b9d33e6d ptrace: kill clon... |
1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 |
if (likely(user_mode(regs)) && !(clone_flags & CLONE_UNTRACED)) { 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 |
1422 |
|
a6f5e0637 pid namespaces: m... |
1423 |
p = copy_process(clone_flags, stack_start, regs, stack_size, |
09a05394f tracehook: clone |
1424 |
child_tidptr, NULL, trace); |
1da177e4c Linux-2.6.12-rc2 |
1425 1426 1427 1428 1429 1430 |
/* * 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; |
0a16b6075 tracing, sched: L... |
1431 |
trace_sched_process_fork(current, p); |
6c5f3e7b4 Pidns: make full ... |
1432 |
nr = task_pid_vnr(p); |
30e49c263 pid namespaces: a... |
1433 1434 1435 |
if (clone_flags & CLONE_PARENT_SETTID) put_user(nr, parent_tidptr); |
a6f5e0637 pid namespaces: m... |
1436 |
|
1da177e4c Linux-2.6.12-rc2 |
1437 1438 1439 1440 |
if (clone_flags & CLONE_VFORK) { p->vfork_done = &vfork; init_completion(&vfork); } |
a64e64944 [PATCH] return re... |
1441 |
audit_finish_fork(p); |
4b9d33e6d ptrace: kill clon... |
1442 1443 |
/* |
09a05394f tracehook: clone |
1444 1445 |
* We set PF_STARTING at creation in case tracing wants to * use this to distinguish a fully live task from one that |
4b9d33e6d ptrace: kill clon... |
1446 1447 |
* hasn't finished SIGSTOP raising yet. Now we clear it * and set the child going. |
09a05394f tracehook: clone |
1448 1449 |
*/ p->flags &= ~PF_STARTING; |
3e51e3edf sched: Remove unu... |
1450 |
wake_up_new_task(p); |
1da177e4c Linux-2.6.12-rc2 |
1451 |
|
4b9d33e6d ptrace: kill clon... |
1452 1453 1454 |
/* forking complete and child started to run, tell ptracer */ if (unlikely(trace)) ptrace_event(trace, nr); |
09a05394f tracehook: clone |
1455 |
|
1da177e4c Linux-2.6.12-rc2 |
1456 |
if (clone_flags & CLONE_VFORK) { |
ba96a0c88 freezer: fix vfor... |
1457 |
freezer_do_not_count(); |
1da177e4c Linux-2.6.12-rc2 |
1458 |
wait_for_completion(&vfork); |
ba96a0c88 freezer: fix vfor... |
1459 |
freezer_count(); |
a288eecce ptrace: kill triv... |
1460 |
ptrace_event(PTRACE_EVENT_VFORK_DONE, nr); |
1da177e4c Linux-2.6.12-rc2 |
1461 1462 |
} } else { |
92476d7fc [PATCH] pidhash: ... |
1463 |
nr = PTR_ERR(p); |
1da177e4c Linux-2.6.12-rc2 |
1464 |
} |
92476d7fc [PATCH] pidhash: ... |
1465 |
return nr; |
1da177e4c Linux-2.6.12-rc2 |
1466 |
} |
5fd63b308 [PATCH] x86_64: I... |
1467 1468 1469 |
#ifndef ARCH_MIN_MMSTRUCT_ALIGN #define ARCH_MIN_MMSTRUCT_ALIGN 0 #endif |
51cc50685 SL*B: drop kmem c... |
1470 |
static void sighand_ctor(void *data) |
aa1757f90 [PATCH] convert s... |
1471 1472 |
{ struct sighand_struct *sighand = data; |
a35afb830 Remove SLAB_CTOR_... |
1473 |
spin_lock_init(&sighand->siglock); |
b8fceee17 signalfd simplifi... |
1474 |
init_waitqueue_head(&sighand->signalfd_wqh); |
aa1757f90 [PATCH] convert s... |
1475 |
} |
1da177e4c Linux-2.6.12-rc2 |
1476 1477 1478 1479 |
void __init proc_caches_init(void) { sighand_cachep = kmem_cache_create("sighand_cache", sizeof(struct sighand_struct), 0, |
2dff44052 kmemcheck: add mm... |
1480 1481 |
SLAB_HWCACHE_ALIGN|SLAB_PANIC|SLAB_DESTROY_BY_RCU| SLAB_NOTRACK, sighand_ctor); |
1da177e4c Linux-2.6.12-rc2 |
1482 1483 |
signal_cachep = kmem_cache_create("signal_cache", sizeof(struct signal_struct), 0, |
2dff44052 kmemcheck: add mm... |
1484 |
SLAB_HWCACHE_ALIGN|SLAB_PANIC|SLAB_NOTRACK, NULL); |
20c2df83d mm: Remove slab d... |
1485 |
files_cachep = kmem_cache_create("files_cache", |
1da177e4c Linux-2.6.12-rc2 |
1486 |
sizeof(struct files_struct), 0, |
2dff44052 kmemcheck: add mm... |
1487 |
SLAB_HWCACHE_ALIGN|SLAB_PANIC|SLAB_NOTRACK, NULL); |
20c2df83d mm: Remove slab d... |
1488 |
fs_cachep = kmem_cache_create("fs_cache", |
1da177e4c Linux-2.6.12-rc2 |
1489 |
sizeof(struct fs_struct), 0, |
2dff44052 kmemcheck: add mm... |
1490 |
SLAB_HWCACHE_ALIGN|SLAB_PANIC|SLAB_NOTRACK, NULL); |
6345d24da mm: Fix boot cras... |
1491 1492 1493 1494 1495 1496 1497 |
/* * 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 |
1498 |
mm_cachep = kmem_cache_create("mm_struct", |
5fd63b308 [PATCH] x86_64: I... |
1499 |
sizeof(struct mm_struct), ARCH_MIN_MMSTRUCT_ALIGN, |
2dff44052 kmemcheck: add mm... |
1500 |
SLAB_HWCACHE_ALIGN|SLAB_PANIC|SLAB_NOTRACK, NULL); |
33e5d7697 nommu: fix a numb... |
1501 |
vm_area_cachep = KMEM_CACHE(vm_area_struct, SLAB_PANIC); |
8feae1311 NOMMU: Make VMAs ... |
1502 |
mmap_init(); |
665771939 make sure that ns... |
1503 |
nsproxy_cache_init(); |
1da177e4c Linux-2.6.12-rc2 |
1504 |
} |
cf2e340f4 [PATCH] unshare s... |
1505 |
|
cf2e340f4 [PATCH] unshare s... |
1506 |
/* |
9bfb23fc4 sys_unshare: remo... |
1507 |
* Check constraints on flags passed to the unshare system call. |
cf2e340f4 [PATCH] unshare s... |
1508 |
*/ |
9bfb23fc4 sys_unshare: remo... |
1509 |
static int check_unshare_flags(unsigned long unshare_flags) |
cf2e340f4 [PATCH] unshare s... |
1510 |
{ |
9bfb23fc4 sys_unshare: remo... |
1511 1512 1513 1514 |
if (unshare_flags & ~(CLONE_THREAD|CLONE_FS|CLONE_NEWNS|CLONE_SIGHAND| CLONE_VM|CLONE_FILES|CLONE_SYSVSEM| CLONE_NEWUTS|CLONE_NEWIPC|CLONE_NEWNET)) return -EINVAL; |
cf2e340f4 [PATCH] unshare s... |
1515 |
/* |
9bfb23fc4 sys_unshare: remo... |
1516 1517 1518 |
* Not implemented, but pretend it works if there is nothing to * unshare. Note that unsharing CLONE_THREAD or CLONE_SIGHAND * needs to unshare vm. |
cf2e340f4 [PATCH] unshare s... |
1519 |
*/ |
9bfb23fc4 sys_unshare: remo... |
1520 1521 1522 1523 1524 |
if (unshare_flags & (CLONE_THREAD | CLONE_SIGHAND | CLONE_VM)) { /* FIXME: get_task_mm() increments ->mm_users */ if (atomic_read(¤t->mm->mm_users) > 1) return -EINVAL; } |
cf2e340f4 [PATCH] unshare s... |
1525 1526 1527 1528 1529 |
return 0; } /* |
99d1419d9 [PATCH] unshare s... |
1530 |
* Unshare the filesystem structure if it is being shared |
cf2e340f4 [PATCH] unshare s... |
1531 1532 1533 1534 |
*/ static int unshare_fs(unsigned long unshare_flags, struct fs_struct **new_fsp) { struct fs_struct *fs = current->fs; |
498052bba New locking/refco... |
1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 |
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... |
1545 1546 1547 1548 1549 |
return 0; } /* |
a016f3389 [PATCH] unshare s... |
1550 |
* Unshare file descriptor table if it is being shared |
cf2e340f4 [PATCH] unshare s... |
1551 1552 1553 1554 |
*/ static int unshare_fd(unsigned long unshare_flags, struct files_struct **new_fdp) { struct files_struct *fd = current->files; |
a016f3389 [PATCH] unshare s... |
1555 |
int error = 0; |
cf2e340f4 [PATCH] unshare s... |
1556 1557 |
if ((unshare_flags & CLONE_FILES) && |
a016f3389 [PATCH] unshare s... |
1558 1559 1560 1561 1562 |
(fd && atomic_read(&fd->count) > 1)) { *new_fdp = dup_fd(fd, &error); if (!*new_fdp) return error; } |
cf2e340f4 [PATCH] unshare s... |
1563 1564 1565 1566 1567 |
return 0; } /* |
cf2e340f4 [PATCH] unshare s... |
1568 1569 1570 1571 1572 1573 1574 |
* 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... |
1575 |
SYSCALL_DEFINE1(unshare, unsigned long, unshare_flags) |
cf2e340f4 [PATCH] unshare s... |
1576 |
{ |
cf2e340f4 [PATCH] unshare s... |
1577 |
struct fs_struct *fs, *new_fs = NULL; |
cf2e340f4 [PATCH] unshare s... |
1578 |
struct files_struct *fd, *new_fd = NULL; |
cf7b708c8 Make access to ta... |
1579 |
struct nsproxy *new_nsproxy = NULL; |
9edff4ab1 ipc: sysvsem: imp... |
1580 |
int do_sysvsem = 0; |
9bfb23fc4 sys_unshare: remo... |
1581 |
int err; |
cf2e340f4 [PATCH] unshare s... |
1582 |
|
9bfb23fc4 sys_unshare: remo... |
1583 1584 |
err = check_unshare_flags(unshare_flags); if (err) |
06f9d4f94 [PATCH] unshare: ... |
1585 |
goto bad_unshare_out; |
6013f67fc ipc: sysvsem: for... |
1586 |
/* |
9bfb23fc4 sys_unshare: remo... |
1587 1588 1589 1590 1591 |
* If unsharing namespace, must also unshare filesystem information. */ if (unshare_flags & CLONE_NEWNS) unshare_flags |= CLONE_FS; /* |
6013f67fc ipc: sysvsem: for... |
1592 1593 1594 1595 1596 |
* 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... |
1597 |
do_sysvsem = 1; |
fb0a685cb kernel/fork.c: fi... |
1598 1599 |
err = unshare_fs(unshare_flags, &new_fs); if (err) |
9bfb23fc4 sys_unshare: remo... |
1600 |
goto bad_unshare_out; |
fb0a685cb kernel/fork.c: fi... |
1601 1602 |
err = unshare_fd(unshare_flags, &new_fd); if (err) |
9bfb23fc4 sys_unshare: remo... |
1603 |
goto bad_unshare_cleanup_fs; |
fb0a685cb kernel/fork.c: fi... |
1604 1605 |
err = unshare_nsproxy_namespaces(unshare_flags, &new_nsproxy, new_fs); if (err) |
9edff4ab1 ipc: sysvsem: imp... |
1606 |
goto bad_unshare_cleanup_fd; |
c0b2fc316 [PATCH] uts: copy... |
1607 |
|
9bfb23fc4 sys_unshare: remo... |
1608 |
if (new_fs || new_fd || do_sysvsem || new_nsproxy) { |
9edff4ab1 ipc: sysvsem: imp... |
1609 1610 1611 1612 1613 1614 |
if (do_sysvsem) { /* * CLONE_SYSVSEM is equivalent to sys_exit(). */ exit_sem(current); } |
ab516013a [PATCH] namespace... |
1615 |
|
c0b2fc316 [PATCH] uts: copy... |
1616 |
if (new_nsproxy) { |
cf7b708c8 Make access to ta... |
1617 1618 |
switch_task_namespaces(current, new_nsproxy); new_nsproxy = NULL; |
c0b2fc316 [PATCH] uts: copy... |
1619 |
} |
cf2e340f4 [PATCH] unshare s... |
1620 |
|
cf7b708c8 Make access to ta... |
1621 |
task_lock(current); |
cf2e340f4 [PATCH] unshare s... |
1622 1623 |
if (new_fs) { fs = current->fs; |
2a4419b5b fs: fs_struct rwl... |
1624 |
spin_lock(&fs->lock); |
cf2e340f4 [PATCH] unshare s... |
1625 |
current->fs = new_fs; |
498052bba New locking/refco... |
1626 1627 1628 1629 |
if (--fs->users) new_fs = NULL; else new_fs = fs; |
2a4419b5b fs: fs_struct rwl... |
1630 |
spin_unlock(&fs->lock); |
cf2e340f4 [PATCH] unshare s... |
1631 |
} |
cf2e340f4 [PATCH] unshare s... |
1632 1633 1634 1635 1636 1637 1638 1639 |
if (new_fd) { fd = current->files; current->files = new_fd; new_fd = fd; } task_unlock(current); } |
c0b2fc316 [PATCH] uts: copy... |
1640 |
if (new_nsproxy) |
444f378b2 Revert "[PATCH] n... |
1641 |
put_nsproxy(new_nsproxy); |
c0b2fc316 [PATCH] uts: copy... |
1642 |
|
cf2e340f4 [PATCH] unshare s... |
1643 1644 1645 |
bad_unshare_cleanup_fd: if (new_fd) put_files_struct(new_fd); |
cf2e340f4 [PATCH] unshare s... |
1646 1647 |
bad_unshare_cleanup_fs: if (new_fs) |
498052bba New locking/refco... |
1648 |
free_fs_struct(new_fs); |
cf2e340f4 [PATCH] unshare s... |
1649 |
|
cf2e340f4 [PATCH] unshare s... |
1650 1651 1652 |
bad_unshare_out: return err; } |
3b1253880 [PATCH] sanitize ... |
1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 |
/* * 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... |
1663 |
struct files_struct *copy = NULL; |
3b1253880 [PATCH] sanitize ... |
1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 |
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; } |