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kernel/fork.c
41.5 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/mnt_namespace.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> |
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#include <linux/tracehook.h> |
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#include <linux/futex.h> |
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#include <linux/compat.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> #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/proc_fs.h> |
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#include <linux/blkdev.h> |
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#include <trace/sched.h> |
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#include <linux/magic.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> /* * Protected counters by write_lock_irq(&tasklist_lock) */ unsigned long total_forks; /* Handle normal Linux uptimes. */ int nr_threads; /* The idle threads do not count.. */ 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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|
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DEFINE_TRACE(sched_process_fork); |
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int nr_processes(void) { int cpu; int total = 0; for_each_online_cpu(cpu) total += per_cpu(process_counts, cpu); return total; } #ifndef __HAVE_ARCH_TASK_STRUCT_ALLOCATOR # define alloc_task_struct() kmem_cache_alloc(task_struct_cachep, GFP_KERNEL) # 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 static inline struct thread_info *alloc_thread_info(struct task_struct *tsk) { #ifdef CONFIG_DEBUG_STACK_USAGE gfp_t mask = GFP_KERNEL | __GFP_ZERO; #else gfp_t mask = GFP_KERNEL; #endif return (struct thread_info *)__get_free_pages(mask, THREAD_SIZE_ORDER); } 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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void free_task(struct task_struct *tsk) { |
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prop_local_destroy_single(&tsk->dirties); |
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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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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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put_cred(tsk->real_cred); |
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put_cred(tsk->cred); |
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delayacct_tsk_free(tsk); |
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if (!profile_handoff_task(tsk)) free_task(tsk); } |
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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, 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 */ if(max_threads < 20) 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 err; |
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prepare_to_copy(orig); tsk = alloc_task_struct(); if (!tsk) return NULL; ti = alloc_thread_info(tsk); if (!ti) { free_task_struct(tsk); return NULL; } |
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err = arch_dup_task_struct(tsk, orig); 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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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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atomic_set(&tsk->fs_excl, 0); |
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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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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, **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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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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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); tmp->vm_flags &= ~VM_LOCKED; tmp->vm_mm = mm; tmp->vm_next = NULL; anon_vma_link(tmp); 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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spin_lock(&mapping->i_mmap_lock); if (tmp->vm_flags & VM_SHARED) mapping->i_mmap_writable++; |
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tmp->vm_truncate_count = mpnt->vm_truncate_count; |
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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); spin_unlock(&mapping->i_mmap_lock); |
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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; __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); |
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if (tmp->vm_ops && tmp->vm_ops->open) tmp->vm_ops->open(tmp); if (retval) goto out; } |
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/* a new mm has just been created */ arch_dup_mmap(oldmm, mm); |
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retval = 0; |
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out: |
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up_write(&mm->mmap_sem); |
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flush_tlb_mm(oldmm); |
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up_write(&oldmm->mmap_sem); return retval; fail_nomem_policy: kmem_cache_free(vm_area_cachep, tmp); fail_nomem: retval = -ENOMEM; vm_unacct_memory(charge); goto out; } static inline int mm_alloc_pgd(struct mm_struct * mm) { mm->pgd = pgd_alloc(mm); if (unlikely(!mm->pgd)) return -ENOMEM; return 0; } static inline void mm_free_pgd(struct mm_struct * mm) { |
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pgd_free(mm, mm->pgd); |
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} #else #define dup_mmap(mm, oldmm) (0) #define mm_alloc_pgd(mm) (0) #define mm_free_pgd(mm) #endif /* CONFIG_MMU */ |
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__cacheline_aligned_in_smp DEFINE_SPINLOCK(mmlist_lock); |
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#define allocate_mm() (kmem_cache_alloc(mm_cachep, GFP_KERNEL)) |
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#define free_mm(mm) (kmem_cache_free(mm_cachep, (mm))) |
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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); |
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#include <linux/init_task.h> |
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static struct mm_struct * mm_init(struct mm_struct * mm, struct task_struct *p) |
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{ atomic_set(&mm->mm_users, 1); atomic_set(&mm->mm_count, 1); init_rwsem(&mm->mmap_sem); INIT_LIST_HEAD(&mm->mmlist); |
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mm->flags = (current->mm) ? current->mm->flags : default_dump_filter; |
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mm->core_state = NULL; |
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mm->nr_ptes = 0; |
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set_mm_counter(mm, file_rss, 0); |
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set_mm_counter(mm, anon_rss, 0); |
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spin_lock_init(&mm->page_table_lock); |
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spin_lock_init(&mm->ioctx_lock); INIT_HLIST_HEAD(&mm->ioctx_list); |
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mm->free_area_cache = TASK_UNMAPPED_BASE; |
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mm->cached_hole_size = ~0UL; |
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mm_init_owner(mm, p); |
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if (likely(!mm_alloc_pgd(mm))) { mm->def_flags = 0; |
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mmu_notifier_mm_init(mm); |
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return mm; } |
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1da177e4c Linux-2.6.12-rc2 |
424 425 426 427 428 429 430 431 432 433 434 435 436 437 |
free_mm(mm); return NULL; } /* * Allocate and initialize an mm_struct. */ struct mm_struct * mm_alloc(void) { struct mm_struct * mm; mm = allocate_mm(); if (mm) { memset(mm, 0, sizeof(*mm)); |
78fb74669 Memory controller... |
438 |
mm = mm_init(mm, current); |
1da177e4c Linux-2.6.12-rc2 |
439 440 441 442 443 444 445 446 447 |
} return mm; } /* * 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... |
448 |
void __mmdrop(struct mm_struct *mm) |
1da177e4c Linux-2.6.12-rc2 |
449 450 451 452 |
{ BUG_ON(mm == &init_mm); mm_free_pgd(mm); destroy_context(mm); |
cddb8a5c1 mmu-notifiers: core |
453 |
mmu_notifier_mm_destroy(mm); |
1da177e4c Linux-2.6.12-rc2 |
454 455 |
free_mm(mm); } |
6d4e4c4fc KVM: Disallow for... |
456 |
EXPORT_SYMBOL_GPL(__mmdrop); |
1da177e4c Linux-2.6.12-rc2 |
457 458 459 460 461 462 |
/* * Decrement the use count and release all resources for an mm. */ void mmput(struct mm_struct *mm) { |
0ae26f1b3 [PATCH] mmput() m... |
463 |
might_sleep(); |
1da177e4c Linux-2.6.12-rc2 |
464 465 466 |
if (atomic_dec_and_test(&mm->mm_users)) { exit_aio(mm); exit_mmap(mm); |
925d1c401 procfs task exe s... |
467 |
set_mm_exe_file(mm, NULL); |
1da177e4c Linux-2.6.12-rc2 |
468 469 470 471 472 473 474 475 476 477 478 479 480 481 |
if (!list_empty(&mm->mmlist)) { spin_lock(&mmlist_lock); list_del(&mm->mmlist); spin_unlock(&mmlist_lock); } put_swap_token(mm); mmdrop(mm); } } EXPORT_SYMBOL_GPL(mmput); /** * get_task_mm - acquire a reference to the task's mm * |
246bb0b1d kill PF_BORROWED_... |
482 |
* Returns %NULL if the task has no mm. Checks PF_KTHREAD (meaning |
1da177e4c Linux-2.6.12-rc2 |
483 484 485 486 487 488 489 490 491 492 493 494 |
* 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_... |
495 |
if (task->flags & PF_KTHREAD) |
1da177e4c Linux-2.6.12-rc2 |
496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 |
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... |
521 522 523 524 525 526 527 528 529 |
/* Get rid of any futexes when releasing the mm */ #ifdef CONFIG_FUTEX if (unlikely(tsk->robust_list)) exit_robust_list(tsk); #ifdef CONFIG_COMPAT if (unlikely(tsk->compat_robust_list)) compat_exit_robust_list(tsk); #endif #endif |
1da177e4c Linux-2.6.12-rc2 |
530 531 532 533 534 535 536 537 |
/* 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... |
538 539 540 541 542 543 544 545 546 547 |
/* * 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. */ if (tsk->clear_child_tid && !(tsk->flags & PF_SIGNALED) && atomic_read(&mm->mm_users) > 1) { |
1da177e4c Linux-2.6.12-rc2 |
548 549 550 551 552 553 554 555 556 557 558 |
u32 __user * tidptr = tsk->clear_child_tid; tsk->clear_child_tid = NULL; /* * We don't check the error code - if userspace has * not set up a proper pointer then tough luck. */ put_user(0, tidptr); sys_futex(tidptr, FUTEX_WAKE, 1, NULL, NULL, 0); } } |
a0a7ec308 [PATCH] unshare s... |
559 560 561 562 |
/* * Allocate a new mm structure and copy contents from the * mm structure of the passed in task structure. */ |
402b08622 s390: KVM prepara... |
563 |
struct mm_struct *dup_mm(struct task_struct *tsk) |
a0a7ec308 [PATCH] unshare s... |
564 565 566 567 568 569 570 571 572 573 574 575 |
{ 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)); |
7602bdf2f [PATCH] new schem... |
576 577 578 |
/* Initializing for Swap token stuff */ mm->token_priority = 0; mm->last_interval = 0; |
78fb74669 Memory controller... |
579 |
if (!mm_init(mm, tsk)) |
a0a7ec308 [PATCH] unshare s... |
580 581 582 583 |
goto fail_nomem; if (init_new_context(tsk, mm)) goto fail_nocontext; |
925d1c401 procfs task exe s... |
584 |
dup_mm_exe_file(oldmm, mm); |
a0a7ec308 [PATCH] unshare s... |
585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 |
err = dup_mmap(mm, oldmm); if (err) goto free_pt; mm->hiwater_rss = get_mm_rss(mm); mm->hiwater_vm = mm->total_vm; return mm; free_pt: 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; } |
1da177e4c Linux-2.6.12-rc2 |
609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 |
static int copy_mm(unsigned long clone_flags, struct task_struct * tsk) { struct mm_struct * mm, *oldmm; int retval; tsk->min_flt = tsk->maj_flt = 0; tsk->nvcsw = tsk->nivcsw = 0; 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 |
632 633 634 635 |
goto good_mm; } retval = -ENOMEM; |
a0a7ec308 [PATCH] unshare s... |
636 |
mm = dup_mm(tsk); |
1da177e4c Linux-2.6.12-rc2 |
637 638 |
if (!mm) goto fail_nomem; |
1da177e4c Linux-2.6.12-rc2 |
639 |
good_mm: |
7602bdf2f [PATCH] new schem... |
640 641 642 |
/* Initializing for Swap token stuff */ mm->token_priority = 0; mm->last_interval = 0; |
1da177e4c Linux-2.6.12-rc2 |
643 644 645 |
tsk->mm = mm; tsk->active_mm = mm; return 0; |
1da177e4c Linux-2.6.12-rc2 |
646 647 |
fail_nomem: return retval; |
1da177e4c Linux-2.6.12-rc2 |
648 |
} |
a39bc5169 Uninline fork.c/e... |
649 |
static struct fs_struct *__copy_fs_struct(struct fs_struct *old) |
1da177e4c Linux-2.6.12-rc2 |
650 651 652 653 654 655 656 657 |
{ struct fs_struct *fs = kmem_cache_alloc(fs_cachep, GFP_KERNEL); /* We don't need to lock fs - think why ;-) */ if (fs) { atomic_set(&fs->count, 1); rwlock_init(&fs->lock); fs->umask = old->umask; read_lock(&old->lock); |
6ac08c39a Use struct path i... |
658 659 660 661 |
fs->root = old->root; path_get(&old->root); fs->pwd = old->pwd; path_get(&old->pwd); |
1da177e4c Linux-2.6.12-rc2 |
662 663 664 665 666 667 668 669 670 671 672 |
read_unlock(&old->lock); } return fs; } struct fs_struct *copy_fs_struct(struct fs_struct *old) { return __copy_fs_struct(old); } EXPORT_SYMBOL_GPL(copy_fs_struct); |
a39bc5169 Uninline fork.c/e... |
673 |
static int copy_fs(unsigned long clone_flags, struct task_struct *tsk) |
1da177e4c Linux-2.6.12-rc2 |
674 675 676 677 678 679 680 681 682 683 |
{ if (clone_flags & CLONE_FS) { atomic_inc(¤t->fs->count); return 0; } tsk->fs = __copy_fs_struct(current->fs); if (!tsk->fs) return -ENOMEM; return 0; } |
a016f3389 [PATCH] unshare s... |
684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 |
static int copy_files(unsigned long clone_flags, struct task_struct * tsk) { 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... |
700 701 702 703 704 705 706 707 708 |
newf = dup_fd(oldf, &error); if (!newf) goto out; tsk->files = newf; error = 0; out: return error; } |
fadad878c kernel: add CLONE... |
709 |
static int copy_io(unsigned long clone_flags, struct task_struct *tsk) |
fd0928df9 ioprio: move io p... |
710 711 712 713 714 715 |
{ #ifdef CONFIG_BLOCK struct io_context *ioc = current->io_context; if (!ioc) return 0; |
fadad878c kernel: add CLONE... |
716 717 718 719 720 721 722 723 |
/* * 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... |
724 725 726 |
tsk->io_context = alloc_io_context(GFP_KERNEL, -1); if (unlikely(!tsk->io_context)) return -ENOMEM; |
fd0928df9 ioprio: move io p... |
727 728 729 730 731 |
tsk->io_context->ioprio = ioc->ioprio; } #endif return 0; } |
a39bc5169 Uninline fork.c/e... |
732 |
static int copy_sighand(unsigned long clone_flags, struct task_struct *tsk) |
1da177e4c Linux-2.6.12-rc2 |
733 734 |
{ struct sighand_struct *sig; |
60348802e fork.c: cleanup f... |
735 |
if (clone_flags & CLONE_SIGHAND) { |
1da177e4c Linux-2.6.12-rc2 |
736 737 738 739 |
atomic_inc(¤t->sighand->count); return 0; } sig = kmem_cache_alloc(sighand_cachep, GFP_KERNEL); |
e56d09031 [PATCH] RCU signa... |
740 |
rcu_assign_pointer(tsk->sighand, sig); |
1da177e4c Linux-2.6.12-rc2 |
741 742 |
if (!sig) return -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
743 744 745 746 |
atomic_set(&sig->count, 1); memcpy(sig->action, current->sighand->action, sizeof(sig->action)); return 0; } |
a7e5328a0 [PATCH] cleanup _... |
747 |
void __cleanup_sighand(struct sighand_struct *sighand) |
c81addc9d [PATCH] rename __... |
748 |
{ |
c81addc9d [PATCH] rename __... |
749 750 751 |
if (atomic_dec_and_test(&sighand->count)) kmem_cache_free(sighand_cachep, sighand); } |
f06febc96 timers: fix itime... |
752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 |
/* * Initialize POSIX timer handling for a thread group. */ static void posix_cpu_timers_init_group(struct signal_struct *sig) { /* Thread group counters. */ thread_group_cputime_init(sig); /* Expiration times and increments. */ sig->it_virt_expires = cputime_zero; sig->it_virt_incr = cputime_zero; sig->it_prof_expires = cputime_zero; sig->it_prof_incr = cputime_zero; /* Cached expiration times. */ sig->cputime_expires.prof_exp = cputime_zero; sig->cputime_expires.virt_exp = cputime_zero; sig->cputime_expires.sched_exp = 0; /* 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... |
777 |
static int copy_signal(unsigned long clone_flags, struct task_struct *tsk) |
1da177e4c Linux-2.6.12-rc2 |
778 779 |
{ struct signal_struct *sig; |
1da177e4c Linux-2.6.12-rc2 |
780 781 |
if (clone_flags & CLONE_THREAD) { |
490dea45d itimers: remove t... |
782 783 784 |
atomic_inc(¤t->signal->count); atomic_inc(¤t->signal->live); return 0; |
1da177e4c Linux-2.6.12-rc2 |
785 786 |
} sig = kmem_cache_alloc(signal_cachep, GFP_KERNEL); |
490dea45d itimers: remove t... |
787 788 789 |
if (sig) posix_cpu_timers_init_group(sig); |
1da177e4c Linux-2.6.12-rc2 |
790 791 792 |
tsk->signal = sig; if (!sig) return -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
793 794 795 796 797 798 799 |
atomic_set(&sig->count, 1); atomic_set(&sig->live, 1); init_waitqueue_head(&sig->wait_chldexit); sig->flags = 0; sig->group_exit_code = 0; sig->group_exit_task = NULL; sig->group_stop_count = 0; |
db51aeccd signals: microopt... |
800 |
sig->curr_target = tsk; |
1da177e4c Linux-2.6.12-rc2 |
801 802 |
init_sigpending(&sig->shared_pending); INIT_LIST_HEAD(&sig->posix_timers); |
c9cb2e3d7 [PATCH] hrtimers:... |
803 |
hrtimer_init(&sig->real_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
2ff678b8d [PATCH] hrtimer: ... |
804 |
sig->it_real_incr.tv64 = 0; |
1da177e4c Linux-2.6.12-rc2 |
805 |
sig->real_timer.function = it_real_fn; |
1da177e4c Linux-2.6.12-rc2 |
806 |
|
1da177e4c Linux-2.6.12-rc2 |
807 |
sig->leader = 0; /* session leadership doesn't inherit */ |
ab521dc0f [PATCH] tty: upda... |
808 |
sig->tty_old_pgrp = NULL; |
9c9f4ded9 tty: Add a kref c... |
809 |
sig->tty = NULL; |
1da177e4c Linux-2.6.12-rc2 |
810 |
|
32bd671d6 signal: re-add de... |
811 |
sig->utime = sig->stime = sig->cutime = sig->cstime = cputime_zero; |
9ac52315d sched: guest CPU ... |
812 813 |
sig->gtime = cputime_zero; sig->cgtime = cputime_zero; |
1da177e4c Linux-2.6.12-rc2 |
814 815 |
sig->nvcsw = sig->nivcsw = sig->cnvcsw = sig->cnivcsw = 0; sig->min_flt = sig->maj_flt = sig->cmin_flt = sig->cmaj_flt = 0; |
6eaeeaba3 getrusage(): fill... |
816 |
sig->inblock = sig->oublock = sig->cinblock = sig->coublock = 0; |
5995477ab task IO accountin... |
817 |
task_io_accounting_init(&sig->ioac); |
32bd671d6 signal: re-add de... |
818 |
sig->sum_sched_runtime = 0; |
ad4ecbcba [PATCH] delay acc... |
819 |
taskstats_tgid_init(sig); |
1da177e4c Linux-2.6.12-rc2 |
820 821 822 823 |
task_lock(current->group_leader); memcpy(sig->rlim, current->signal->rlim, sizeof sig->rlim); task_unlock(current->group_leader); |
0e4648141 [PATCH] pacct: ad... |
824 |
acct_init_pacct(&sig->pacct); |
1da177e4c Linux-2.6.12-rc2 |
825 |
|
522ed7767 Audit: add TTY in... |
826 |
tty_audit_fork(sig); |
1da177e4c Linux-2.6.12-rc2 |
827 828 |
return 0; } |
6b3934ef5 [PATCH] copy_proc... |
829 830 |
void __cleanup_signal(struct signal_struct *sig) { |
f06febc96 timers: fix itime... |
831 |
thread_group_cputime_free(sig); |
9c9f4ded9 tty: Add a kref c... |
832 |
tty_kref_put(sig->tty); |
6b3934ef5 [PATCH] copy_proc... |
833 834 |
kmem_cache_free(signal_cachep, sig); } |
a39bc5169 Uninline fork.c/e... |
835 |
static void cleanup_signal(struct task_struct *tsk) |
6b3934ef5 [PATCH] copy_proc... |
836 837 838 839 840 841 842 843 |
{ struct signal_struct *sig = tsk->signal; atomic_dec(&sig->live); if (atomic_dec_and_test(&sig->count)) __cleanup_signal(sig); } |
a39bc5169 Uninline fork.c/e... |
844 |
static void copy_flags(unsigned long clone_flags, struct task_struct *p) |
1da177e4c Linux-2.6.12-rc2 |
845 846 |
{ unsigned long new_flags = p->flags; |
831441862 Freezer: make ker... |
847 |
new_flags &= ~PF_SUPERPRIV; |
1da177e4c Linux-2.6.12-rc2 |
848 |
new_flags |= PF_FORKNOEXEC; |
09a05394f tracehook: clone |
849 |
new_flags |= PF_STARTING; |
1da177e4c Linux-2.6.12-rc2 |
850 |
p->flags = new_flags; |
2e1318956 freezer: prevent ... |
851 |
clear_freeze_flag(p); |
1da177e4c Linux-2.6.12-rc2 |
852 |
} |
17da2bd90 [CVE-2009-0029] S... |
853 |
SYSCALL_DEFINE1(set_tid_address, int __user *, tidptr) |
1da177e4c Linux-2.6.12-rc2 |
854 855 |
{ current->clear_child_tid = tidptr; |
b488893a3 pid namespaces: c... |
856 |
return task_pid_vnr(current); |
1da177e4c Linux-2.6.12-rc2 |
857 |
} |
a39bc5169 Uninline fork.c/e... |
858 |
static void rt_mutex_init_task(struct task_struct *p) |
23f78d4a0 [PATCH] pi-futex:... |
859 |
{ |
23f78d4a0 [PATCH] pi-futex:... |
860 |
spin_lock_init(&p->pi_lock); |
e29e175b0 [PATCH] initialis... |
861 |
#ifdef CONFIG_RT_MUTEXES |
23f78d4a0 [PATCH] pi-futex:... |
862 863 |
plist_head_init(&p->pi_waiters, &p->pi_lock); p->pi_blocked_on = NULL; |
23f78d4a0 [PATCH] pi-futex:... |
864 865 |
#endif } |
cf475ad28 cgroups: add an o... |
866 867 868 869 870 871 |
#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 |
872 |
/* |
f06febc96 timers: fix itime... |
873 874 875 876 877 878 879 880 881 882 883 884 885 |
* 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 |
886 887 888 889 890 891 892 |
* 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... |
893 894 895 896 |
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... |
897 |
int __user *child_tidptr, |
09a05394f tracehook: clone |
898 899 |
struct pid *pid, int trace) |
1da177e4c Linux-2.6.12-rc2 |
900 901 |
{ int retval; |
a24efe62d kernel/fork.c: re... |
902 |
struct task_struct *p; |
b4f48b636 Task Control Grou... |
903 |
int cgroup_callbacks_done = 0; |
1da177e4c Linux-2.6.12-rc2 |
904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 |
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); retval = security_task_create(clone_flags); if (retval) goto fork_out; retval = -ENOMEM; p = dup_task_struct(current); if (!p) goto fork_out; |
bea493a03 [PATCH] rt-mutex:... |
931 |
rt_mutex_init_task(p); |
d12c1a379 lockdep: fix kern... |
932 |
#ifdef CONFIG_PROVE_LOCKING |
de30a2b35 [PATCH] lockdep: ... |
933 934 935 |
DEBUG_LOCKS_WARN_ON(!p->hardirqs_enabled); DEBUG_LOCKS_WARN_ON(!p->softirqs_enabled); #endif |
1da177e4c Linux-2.6.12-rc2 |
936 |
retval = -EAGAIN; |
3b11a1dec CRED: Differentia... |
937 |
if (atomic_read(&p->real_cred->user->processes) >= |
1da177e4c Linux-2.6.12-rc2 |
938 939 |
p->signal->rlim[RLIMIT_NPROC].rlim_cur) { if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RESOURCE) && |
18b6e0414 User namespaces: ... |
940 |
p->real_cred->user != INIT_USER) |
1da177e4c Linux-2.6.12-rc2 |
941 942 |
goto bad_fork_free; } |
f1752eec6 CRED: Detach the ... |
943 944 945 |
retval = copy_creds(p, clone_flags); if (retval < 0) goto bad_fork_free; |
1da177e4c Linux-2.6.12-rc2 |
946 947 948 949 950 951 |
/* * 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 ... |
952 |
retval = -EAGAIN; |
1da177e4c Linux-2.6.12-rc2 |
953 954 |
if (nr_threads >= max_threads) goto bad_fork_cleanup_count; |
a1261f546 [PATCH] m68k: int... |
955 |
if (!try_module_get(task_thread_info(p)->exec_domain->module)) |
1da177e4c Linux-2.6.12-rc2 |
956 957 958 959 960 961 |
goto bad_fork_cleanup_count; if (p->binfmt && !try_module_get(p->binfmt->module)) goto bad_fork_cleanup_put_domain; p->did_exec = 0; |
ca74e92b4 [PATCH] per-task-... |
962 |
delayacct_tsk_init(p); /* Must remain after dup_task_struct() */ |
1da177e4c Linux-2.6.12-rc2 |
963 |
copy_flags(clone_flags, p); |
1da177e4c Linux-2.6.12-rc2 |
964 965 |
INIT_LIST_HEAD(&p->children); INIT_LIST_HEAD(&p->sibling); |
e260be673 Preempt-RCU: impl... |
966 967 968 969 |
#ifdef CONFIG_PREEMPT_RCU p->rcu_read_lock_nesting = 0; p->rcu_flipctr_idx = 0; #endif /* #ifdef CONFIG_PREEMPT_RCU */ |
1da177e4c Linux-2.6.12-rc2 |
970 971 |
p->vfork_done = NULL; spin_lock_init(&p->alloc_lock); |
1da177e4c Linux-2.6.12-rc2 |
972 973 974 975 976 977 |
clear_tsk_thread_flag(p, TIF_SIGPENDING); init_sigpending(&p->pending); p->utime = cputime_zero; p->stime = cputime_zero; |
9ac52315d sched: guest CPU ... |
978 |
p->gtime = cputime_zero; |
c66f08be7 Add scaled time t... |
979 980 |
p->utimescaled = cputime_zero; p->stimescaled = cputime_zero; |
73a2bcb0e sched: keep utime... |
981 |
p->prev_utime = cputime_zero; |
9301899be sched: fix /proc/... |
982 |
p->prev_stime = cputime_zero; |
172ba844a sched: update del... |
983 |
|
6976675d9 hrtimer: create a... |
984 |
p->default_timer_slack_ns = current->timer_slack_ns; |
82a1fcb90 softlockup: autom... |
985 986 987 988 |
#ifdef CONFIG_DETECT_SOFTLOCKUP p->last_switch_count = 0; p->last_switch_timestamp = 0; #endif |
5995477ab task IO accountin... |
989 |
task_io_accounting_init(&p->ioac); |
1da177e4c Linux-2.6.12-rc2 |
990 |
acct_clear_integrals(p); |
f06febc96 timers: fix itime... |
991 |
posix_cpu_timers_init(p); |
1da177e4c Linux-2.6.12-rc2 |
992 993 994 |
p->lock_depth = -1; /* -1 = no lock */ do_posix_clock_monotonic_gettime(&p->start_time); |
924b42d5a Use boot based ti... |
995 996 |
p->real_start_time = p->start_time; monotonic_to_bootbased(&p->real_start_time); |
1da177e4c Linux-2.6.12-rc2 |
997 |
p->io_context = NULL; |
1da177e4c Linux-2.6.12-rc2 |
998 |
p->audit_context = NULL; |
b4f48b636 Task Control Grou... |
999 |
cgroup_fork(p); |
1da177e4c Linux-2.6.12-rc2 |
1000 |
#ifdef CONFIG_NUMA |
846a16bf0 mempolicy: rename... |
1001 |
p->mempolicy = mpol_dup(p->mempolicy); |
1da177e4c Linux-2.6.12-rc2 |
1002 1003 1004 |
if (IS_ERR(p->mempolicy)) { retval = PTR_ERR(p->mempolicy); p->mempolicy = NULL; |
b4f48b636 Task Control Grou... |
1005 |
goto bad_fork_cleanup_cgroup; |
1da177e4c Linux-2.6.12-rc2 |
1006 |
} |
c61afb181 [PATCH] cpuset me... |
1007 |
mpol_fix_fork_child_flag(p); |
1da177e4c Linux-2.6.12-rc2 |
1008 |
#endif |
de30a2b35 [PATCH] lockdep: ... |
1009 1010 |
#ifdef CONFIG_TRACE_IRQFLAGS p->irq_events = 0; |
b36e4758d [ARM] Fix kernel/... |
1011 1012 1013 |
#ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW p->hardirqs_enabled = 1; #else |
de30a2b35 [PATCH] lockdep: ... |
1014 |
p->hardirqs_enabled = 0; |
b36e4758d [ARM] Fix kernel/... |
1015 |
#endif |
de30a2b35 [PATCH] lockdep: ... |
1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 |
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: ... |
1028 1029 1030 1031 1032 |
#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 |
1033 |
|
408894ee4 [PATCH] mutex sub... |
1034 1035 1036 |
#ifdef CONFIG_DEBUG_MUTEXES p->blocked_on = NULL; /* not blocked yet */ #endif |
06eb23b1b ptrace, x86: fix ... |
1037 |
if (unlikely(current->ptrace)) |
bf53de907 x86, bts: add for... |
1038 |
ptrace_fork(p, clone_flags); |
408894ee4 [PATCH] mutex sub... |
1039 |
|
3c90e6e99 sched: fix copy_n... |
1040 1041 |
/* Perform scheduler related setup. Assign this task to a CPU. */ sched_fork(p, clone_flags); |
1da177e4c Linux-2.6.12-rc2 |
1042 |
if ((retval = audit_alloc(p))) |
f1752eec6 CRED: Detach the ... |
1043 |
goto bad_fork_cleanup_policy; |
1da177e4c Linux-2.6.12-rc2 |
1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 |
/* copy all the process information */ if ((retval = copy_semundo(clone_flags, p))) goto bad_fork_cleanup_audit; if ((retval = copy_files(clone_flags, p))) goto bad_fork_cleanup_semundo; if ((retval = copy_fs(clone_flags, p))) goto bad_fork_cleanup_files; if ((retval = copy_sighand(clone_flags, p))) goto bad_fork_cleanup_fs; if ((retval = copy_signal(clone_flags, p))) goto bad_fork_cleanup_sighand; if ((retval = copy_mm(clone_flags, p))) goto bad_fork_cleanup_signal; |
ab516013a [PATCH] namespace... |
1057 |
if ((retval = copy_namespaces(clone_flags, p))) |
d84f4f992 CRED: Inaugurate ... |
1058 |
goto bad_fork_cleanup_mm; |
fadad878c kernel: add CLONE... |
1059 |
if ((retval = copy_io(clone_flags, p))) |
fd0928df9 ioprio: move io p... |
1060 |
goto bad_fork_cleanup_namespaces; |
1da177e4c Linux-2.6.12-rc2 |
1061 1062 |
retval = copy_thread(0, clone_flags, stack_start, stack_size, p, regs); if (retval) |
fd0928df9 ioprio: move io p... |
1063 |
goto bad_fork_cleanup_io; |
1da177e4c Linux-2.6.12-rc2 |
1064 |
|
425fb2b4b pid namespaces: m... |
1065 1066 |
if (pid != &init_struct_pid) { retval = -ENOMEM; |
61bce0f13 pid: generalize t... |
1067 |
pid = alloc_pid(p->nsproxy->pid_ns); |
425fb2b4b pid namespaces: m... |
1068 |
if (!pid) |
fd0928df9 ioprio: move io p... |
1069 |
goto bad_fork_cleanup_io; |
6f4e64335 pid namespaces: i... |
1070 1071 |
if (clone_flags & CLONE_NEWPID) { |
61bce0f13 pid: generalize t... |
1072 |
retval = pid_ns_prepare_proc(p->nsproxy->pid_ns); |
6f4e64335 pid namespaces: i... |
1073 1074 1075 |
if (retval < 0) goto bad_fork_free_pid; } |
425fb2b4b pid namespaces: m... |
1076 |
} |
e8e1abe92 ftrace: fix race ... |
1077 |
ftrace_graph_init_task(p); |
425fb2b4b pid namespaces: m... |
1078 1079 1080 1081 |
p->pid = pid_nr(pid); p->tgid = p->pid; if (clone_flags & CLONE_THREAD) p->tgid = current->tgid; |
e885dcde7 cgroup_clone: use... |
1082 1083 1084 |
if (current->nsproxy != p->nsproxy) { retval = ns_cgroup_clone(p, pid); if (retval) |
e8e1abe92 ftrace: fix race ... |
1085 |
goto bad_fork_free_graph; |
e885dcde7 cgroup_clone: use... |
1086 |
} |
1da177e4c Linux-2.6.12-rc2 |
1087 1088 1089 1090 1091 |
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; |
42b2dd0a0 Shrink task_struc... |
1092 |
#ifdef CONFIG_FUTEX |
8f17d3a50 [PATCH] lightweig... |
1093 1094 1095 1096 |
p->robust_list = NULL; #ifdef CONFIG_COMPAT p->compat_robust_list = NULL; #endif |
c87e2837b [PATCH] pi-futex:... |
1097 1098 |
INIT_LIST_HEAD(&p->pi_state_list); p->pi_state_cache = NULL; |
42b2dd0a0 Shrink task_struc... |
1099 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
1100 |
/* |
f9a3879ab [PATCH] Fix sigal... |
1101 1102 1103 1104 1105 1106 |
* 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; /* |
1da177e4c Linux-2.6.12-rc2 |
1107 1108 1109 1110 |
* Syscall tracing should be turned off in the child regardless * of CLONE_PTRACE. */ clear_tsk_thread_flag(p, TIF_SYSCALL_TRACE); |
ed75e8d58 [PATCH] UML Suppo... |
1111 1112 1113 |
#ifdef TIF_SYSCALL_EMU clear_tsk_thread_flag(p, TIF_SYSCALL_EMU); #endif |
9745512ce sched: latencytop... |
1114 |
clear_all_latency_tracing(p); |
1da177e4c Linux-2.6.12-rc2 |
1115 |
|
1da177e4c Linux-2.6.12-rc2 |
1116 1117 1118 1119 |
/* 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 |
1120 1121 1122 1123 1124 |
/* * Ok, make it visible to the rest of the system. * We dont wake it up yet. */ p->group_leader = p; |
47e65328a [PATCH] pids: kil... |
1125 |
INIT_LIST_HEAD(&p->thread_group); |
1da177e4c Linux-2.6.12-rc2 |
1126 |
|
b4f48b636 Task Control Grou... |
1127 1128 1129 1130 1131 |
/* 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 |
1132 1133 1134 1135 |
/* Need tasklist lock for parent etc handling! */ write_lock_irq(&tasklist_lock); /* |
476d139c2 [PATCH] sched: co... |
1136 1137 1138 1139 1140 1141 1142 |
* The task hasn't been attached yet, so its cpus_allowed mask will * not be changed, nor will its assigned CPU. * * The cpus_allowed mask of the parent may have changed after it was * copied first time - so re-copy it here, then check the child's CPU * to ensure it is on a valid CPU (and if not, just force it back to * parent's CPU). This avoids alot of nasty races. |
1da177e4c Linux-2.6.12-rc2 |
1143 1144 |
*/ p->cpus_allowed = current->cpus_allowed; |
6f505b164 sched: rt group s... |
1145 |
p->rt.nr_cpus_allowed = current->rt.nr_cpus_allowed; |
26ff6ad97 [PATCH] CPU hotpl... |
1146 1147 |
if (unlikely(!cpu_isset(task_cpu(p), p->cpus_allowed) || !cpu_online(task_cpu(p)))) |
476d139c2 [PATCH] sched: co... |
1148 |
set_task_cpu(p, smp_processor_id()); |
1da177e4c Linux-2.6.12-rc2 |
1149 |
|
1da177e4c Linux-2.6.12-rc2 |
1150 |
/* CLONE_PARENT re-uses the old parent */ |
2d5516cbb copy_process: fix... |
1151 |
if (clone_flags & (CLONE_PARENT|CLONE_THREAD)) { |
1da177e4c Linux-2.6.12-rc2 |
1152 |
p->real_parent = current->real_parent; |
2d5516cbb copy_process: fix... |
1153 1154 |
p->parent_exec_id = current->parent_exec_id; } else { |
1da177e4c Linux-2.6.12-rc2 |
1155 |
p->real_parent = current; |
2d5516cbb copy_process: fix... |
1156 1157 |
p->parent_exec_id = current->self_exec_id; } |
1da177e4c Linux-2.6.12-rc2 |
1158 |
|
3f17da699 [PATCH] fix kill_... |
1159 |
spin_lock(¤t->sighand->siglock); |
4a2c7a783 [PATCH] make fork... |
1160 1161 1162 1163 1164 1165 1166 1167 1168 |
/* * 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). */ |
23ff44402 whitespace fixes:... |
1169 |
recalc_sigpending(); |
4a2c7a783 [PATCH] make fork... |
1170 1171 1172 1173 |
if (signal_pending(current)) { spin_unlock(¤t->sighand->siglock); write_unlock_irq(&tasklist_lock); retval = -ERESTARTNOINTR; |
e8e1abe92 ftrace: fix race ... |
1174 |
goto bad_fork_free_graph; |
4a2c7a783 [PATCH] make fork... |
1175 |
} |
1da177e4c Linux-2.6.12-rc2 |
1176 |
if (clone_flags & CLONE_THREAD) { |
1da177e4c Linux-2.6.12-rc2 |
1177 |
p->group_leader = current->group_leader; |
47e65328a [PATCH] pids: kil... |
1178 |
list_add_tail_rcu(&p->thread_group, &p->group_leader->thread_group); |
1da177e4c Linux-2.6.12-rc2 |
1179 |
} |
73b9ebfe1 [PATCH] pidhash: ... |
1180 |
if (likely(p->pid)) { |
f470021ad ptrace children r... |
1181 |
list_add_tail(&p->sibling, &p->real_parent->children); |
09a05394f tracehook: clone |
1182 |
tracehook_finish_clone(p, clone_flags, trace); |
73b9ebfe1 [PATCH] pidhash: ... |
1183 1184 |
if (thread_group_leader(p)) { |
5cd17569f fix clone(CLONE_N... |
1185 |
if (clone_flags & CLONE_NEWPID) |
30e49c263 pid namespaces: a... |
1186 |
p->nsproxy->pid_ns->child_reaper = p; |
73b9ebfe1 [PATCH] pidhash: ... |
1187 |
|
fea9d1755 ITIMER_REAL: conv... |
1188 |
p->signal->leader_pid = pid; |
9c9f4ded9 tty: Add a kref c... |
1189 1190 |
tty_kref_put(p->signal->tty); p->signal->tty = tty_kref_get(current->signal->tty); |
5cd17569f fix clone(CLONE_N... |
1191 1192 1193 1194 |
set_task_pgrp(p, task_pgrp_nr(current)); set_task_session(p, task_session_nr(current)); attach_pid(p, PIDTYPE_PGID, task_pgrp(current)); attach_pid(p, PIDTYPE_SID, task_session(current)); |
5e85d4abe [PATCH] task: Mak... |
1195 |
list_add_tail_rcu(&p->tasks, &init_task.tasks); |
1da177e4c Linux-2.6.12-rc2 |
1196 |
__get_cpu_var(process_counts)++; |
73b9ebfe1 [PATCH] pidhash: ... |
1197 |
} |
85868995d Use struct pid pa... |
1198 |
attach_pid(p, PIDTYPE_PID, pid); |
73b9ebfe1 [PATCH] pidhash: ... |
1199 |
nr_threads++; |
1da177e4c Linux-2.6.12-rc2 |
1200 |
} |
1da177e4c Linux-2.6.12-rc2 |
1201 |
total_forks++; |
3f17da699 [PATCH] fix kill_... |
1202 |
spin_unlock(¤t->sighand->siglock); |
1da177e4c Linux-2.6.12-rc2 |
1203 |
write_unlock_irq(&tasklist_lock); |
c13cf856c [PATCH] fork.c: p... |
1204 |
proc_fork_connector(p); |
817929ec2 Task Control Grou... |
1205 |
cgroup_post_fork(p); |
1da177e4c Linux-2.6.12-rc2 |
1206 |
return p; |
e8e1abe92 ftrace: fix race ... |
1207 1208 |
bad_fork_free_graph: ftrace_graph_exit_task(p); |
425fb2b4b pid namespaces: m... |
1209 1210 1211 |
bad_fork_free_pid: if (pid != &init_struct_pid) free_pid(pid); |
fd0928df9 ioprio: move io p... |
1212 1213 |
bad_fork_cleanup_io: put_io_context(p->io_context); |
ab516013a [PATCH] namespace... |
1214 |
bad_fork_cleanup_namespaces: |
444f378b2 Revert "[PATCH] n... |
1215 |
exit_task_namespaces(p); |
1da177e4c Linux-2.6.12-rc2 |
1216 1217 1218 1219 |
bad_fork_cleanup_mm: if (p->mm) mmput(p->mm); bad_fork_cleanup_signal: |
6b3934ef5 [PATCH] copy_proc... |
1220 |
cleanup_signal(p); |
1da177e4c Linux-2.6.12-rc2 |
1221 |
bad_fork_cleanup_sighand: |
a7e5328a0 [PATCH] cleanup _... |
1222 |
__cleanup_sighand(p->sighand); |
1da177e4c Linux-2.6.12-rc2 |
1223 1224 1225 1226 1227 1228 1229 1230 |
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 |
1231 1232 |
bad_fork_cleanup_policy: #ifdef CONFIG_NUMA |
f0be3d32b mempolicy: rename... |
1233 |
mpol_put(p->mempolicy); |
b4f48b636 Task Control Grou... |
1234 |
bad_fork_cleanup_cgroup: |
1da177e4c Linux-2.6.12-rc2 |
1235 |
#endif |
b4f48b636 Task Control Grou... |
1236 |
cgroup_exit(p, cgroup_callbacks_done); |
35df17c57 [PATCH] task dela... |
1237 |
delayacct_tsk_free(p); |
1da177e4c Linux-2.6.12-rc2 |
1238 1239 1240 |
if (p->binfmt) module_put(p->binfmt->module); bad_fork_cleanup_put_domain: |
a1261f546 [PATCH] m68k: int... |
1241 |
module_put(task_thread_info(p)->exec_domain->module); |
1da177e4c Linux-2.6.12-rc2 |
1242 |
bad_fork_cleanup_count: |
d84f4f992 CRED: Inaugurate ... |
1243 |
atomic_dec(&p->cred->user->processes); |
3b11a1dec CRED: Differentia... |
1244 |
put_cred(p->real_cred); |
f1752eec6 CRED: Detach the ... |
1245 |
put_cred(p->cred); |
1da177e4c Linux-2.6.12-rc2 |
1246 1247 |
bad_fork_free: free_task(p); |
fe7d37d1f [PATCH] copy_proc... |
1248 1249 |
fork_out: return ERR_PTR(retval); |
1da177e4c Linux-2.6.12-rc2 |
1250 |
} |
6b2fb3c65 idle_regs() must ... |
1251 |
noinline struct pt_regs * __cpuinit __attribute__((weak)) idle_regs(struct pt_regs *regs) |
1da177e4c Linux-2.6.12-rc2 |
1252 1253 1254 1255 |
{ memset(regs, 0, sizeof(struct pt_regs)); return regs; } |
9abcf40b1 [PATCH] fork_idle... |
1256 |
struct task_struct * __cpuinit fork_idle(int cpu) |
1da177e4c Linux-2.6.12-rc2 |
1257 |
{ |
36c8b5868 [PATCH] sched: cl... |
1258 |
struct task_struct *task; |
1da177e4c Linux-2.6.12-rc2 |
1259 |
struct pt_regs regs; |
30e49c263 pid namespaces: a... |
1260 |
task = copy_process(CLONE_VM, 0, idle_regs(®s), 0, NULL, |
09a05394f tracehook: clone |
1261 |
&init_struct_pid, 0); |
753ca4f31 [PATCH] fix copy_... |
1262 1263 |
if (!IS_ERR(task)) init_idle(task, cpu); |
73b9ebfe1 [PATCH] pidhash: ... |
1264 |
|
1da177e4c Linux-2.6.12-rc2 |
1265 1266 |
return task; } |
1da177e4c Linux-2.6.12-rc2 |
1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 |
/* * 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: ... |
1282 |
long nr; |
1da177e4c Linux-2.6.12-rc2 |
1283 |
|
bdff746a3 clone: prepare to... |
1284 |
/* |
18b6e0414 User namespaces: ... |
1285 1286 1287 1288 1289 1290 1291 1292 1293 |
* 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: ... |
1294 1295 |
if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SETUID) || !capable(CAP_SETGID)) |
18b6e0414 User namespaces: ... |
1296 1297 1298 1299 |
return -EPERM; } /* |
bdff746a3 clone: prepare to... |
1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 |
* We hope to recycle these flags after 2.6.26 */ if (unlikely(clone_flags & CLONE_STOPPED)) { static int __read_mostly count = 100; if (count > 0 && printk_ratelimit()) { char comm[TASK_COMM_LEN]; count--; printk(KERN_INFO "fork(): process `%s' used deprecated " "clone flags 0x%lx ", get_task_comm(comm, current), clone_flags & CLONE_STOPPED); } } |
09a05394f tracehook: clone |
1316 1317 1318 1319 1320 |
/* * When called from kernel_thread, don't do user tracing stuff. */ if (likely(user_mode(regs))) trace = tracehook_prepare_clone(clone_flags); |
1da177e4c Linux-2.6.12-rc2 |
1321 |
|
a6f5e0637 pid namespaces: m... |
1322 |
p = copy_process(clone_flags, stack_start, regs, stack_size, |
09a05394f tracehook: clone |
1323 |
child_tidptr, NULL, trace); |
1da177e4c Linux-2.6.12-rc2 |
1324 1325 1326 1327 1328 1329 |
/* * 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... |
1330 |
trace_sched_process_fork(current, p); |
6c5f3e7b4 Pidns: make full ... |
1331 |
nr = task_pid_vnr(p); |
30e49c263 pid namespaces: a... |
1332 1333 1334 |
if (clone_flags & CLONE_PARENT_SETTID) put_user(nr, parent_tidptr); |
a6f5e0637 pid namespaces: m... |
1335 |
|
1da177e4c Linux-2.6.12-rc2 |
1336 1337 1338 1339 |
if (clone_flags & CLONE_VFORK) { p->vfork_done = &vfork; init_completion(&vfork); } |
a64e64944 [PATCH] return re... |
1340 |
audit_finish_fork(p); |
09a05394f tracehook: clone |
1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 |
tracehook_report_clone(trace, regs, clone_flags, nr, p); /* * We set PF_STARTING at creation in case tracing wants to * use this to distinguish a fully live task from one that * hasn't gotten to tracehook_report_clone() yet. Now we * clear it and set the child going. */ p->flags &= ~PF_STARTING; if (unlikely(clone_flags & CLONE_STOPPED)) { |
1da177e4c Linux-2.6.12-rc2 |
1352 1353 1354 1355 1356 |
/* * We'll start up with an immediate SIGSTOP. */ sigaddset(&p->pending.signal, SIGSTOP); set_tsk_thread_flag(p, TIF_SIGPENDING); |
d9ae90ac4 use __set_task_st... |
1357 |
__set_task_state(p, TASK_STOPPED); |
09a05394f tracehook: clone |
1358 1359 |
} else { wake_up_new_task(p, clone_flags); |
1da177e4c Linux-2.6.12-rc2 |
1360 |
} |
09a05394f tracehook: clone |
1361 1362 |
tracehook_report_clone_complete(trace, regs, clone_flags, nr, p); |
1da177e4c Linux-2.6.12-rc2 |
1363 |
if (clone_flags & CLONE_VFORK) { |
ba96a0c88 freezer: fix vfor... |
1364 |
freezer_do_not_count(); |
1da177e4c Linux-2.6.12-rc2 |
1365 |
wait_for_completion(&vfork); |
ba96a0c88 freezer: fix vfor... |
1366 |
freezer_count(); |
daded34be tracehook: vfork-... |
1367 |
tracehook_report_vfork_done(p, nr); |
1da177e4c Linux-2.6.12-rc2 |
1368 1369 |
} } else { |
92476d7fc [PATCH] pidhash: ... |
1370 |
nr = PTR_ERR(p); |
1da177e4c Linux-2.6.12-rc2 |
1371 |
} |
92476d7fc [PATCH] pidhash: ... |
1372 |
return nr; |
1da177e4c Linux-2.6.12-rc2 |
1373 |
} |
5fd63b308 [PATCH] x86_64: I... |
1374 1375 1376 |
#ifndef ARCH_MIN_MMSTRUCT_ALIGN #define ARCH_MIN_MMSTRUCT_ALIGN 0 #endif |
51cc50685 SL*B: drop kmem c... |
1377 |
static void sighand_ctor(void *data) |
aa1757f90 [PATCH] convert s... |
1378 1379 |
{ struct sighand_struct *sighand = data; |
a35afb830 Remove SLAB_CTOR_... |
1380 |
spin_lock_init(&sighand->siglock); |
b8fceee17 signalfd simplifi... |
1381 |
init_waitqueue_head(&sighand->signalfd_wqh); |
aa1757f90 [PATCH] convert s... |
1382 |
} |
1da177e4c Linux-2.6.12-rc2 |
1383 1384 1385 1386 |
void __init proc_caches_init(void) { sighand_cachep = kmem_cache_create("sighand_cache", sizeof(struct sighand_struct), 0, |
aa1757f90 [PATCH] convert s... |
1387 |
SLAB_HWCACHE_ALIGN|SLAB_PANIC|SLAB_DESTROY_BY_RCU, |
20c2df83d mm: Remove slab d... |
1388 |
sighand_ctor); |
1da177e4c Linux-2.6.12-rc2 |
1389 1390 |
signal_cachep = kmem_cache_create("signal_cache", sizeof(struct signal_struct), 0, |
20c2df83d mm: Remove slab d... |
1391 1392 |
SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); files_cachep = kmem_cache_create("files_cache", |
1da177e4c Linux-2.6.12-rc2 |
1393 |
sizeof(struct files_struct), 0, |
20c2df83d mm: Remove slab d... |
1394 1395 |
SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); fs_cachep = kmem_cache_create("fs_cache", |
1da177e4c Linux-2.6.12-rc2 |
1396 |
sizeof(struct fs_struct), 0, |
20c2df83d mm: Remove slab d... |
1397 |
SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); |
1da177e4c Linux-2.6.12-rc2 |
1398 |
mm_cachep = kmem_cache_create("mm_struct", |
5fd63b308 [PATCH] x86_64: I... |
1399 |
sizeof(struct mm_struct), ARCH_MIN_MMSTRUCT_ALIGN, |
20c2df83d mm: Remove slab d... |
1400 |
SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); |
33e5d7697 nommu: fix a numb... |
1401 |
vm_area_cachep = KMEM_CACHE(vm_area_struct, SLAB_PANIC); |
8feae1311 NOMMU: Make VMAs ... |
1402 |
mmap_init(); |
1da177e4c Linux-2.6.12-rc2 |
1403 |
} |
cf2e340f4 [PATCH] unshare s... |
1404 |
|
cf2e340f4 [PATCH] unshare s... |
1405 1406 1407 1408 |
/* * Check constraints on flags passed to the unshare system call and * force unsharing of additional process context as appropriate. */ |
a39bc5169 Uninline fork.c/e... |
1409 |
static void check_unshare_flags(unsigned long *flags_ptr) |
cf2e340f4 [PATCH] unshare s... |
1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 |
{ /* * If unsharing a thread from a thread group, must also * unshare vm. */ if (*flags_ptr & CLONE_THREAD) *flags_ptr |= CLONE_VM; /* * If unsharing vm, must also unshare signal handlers. */ if (*flags_ptr & CLONE_VM) *flags_ptr |= CLONE_SIGHAND; /* * If unsharing signal handlers and the task was created * using CLONE_THREAD, then must unshare the thread */ if ((*flags_ptr & CLONE_SIGHAND) && (atomic_read(¤t->signal->count) > 1)) *flags_ptr |= CLONE_THREAD; /* * If unsharing namespace, must also unshare filesystem information. */ if (*flags_ptr & CLONE_NEWNS) *flags_ptr |= CLONE_FS; } /* * Unsharing of tasks created with CLONE_THREAD is not supported yet */ static int unshare_thread(unsigned long unshare_flags) { if (unshare_flags & CLONE_THREAD) return -EINVAL; return 0; } /* |
99d1419d9 [PATCH] unshare s... |
1451 |
* Unshare the filesystem structure if it is being shared |
cf2e340f4 [PATCH] unshare s... |
1452 1453 1454 1455 1456 1457 |
*/ static int unshare_fs(unsigned long unshare_flags, struct fs_struct **new_fsp) { struct fs_struct *fs = current->fs; if ((unshare_flags & CLONE_FS) && |
99d1419d9 [PATCH] unshare s... |
1458 1459 1460 1461 1462 |
(fs && atomic_read(&fs->count) > 1)) { *new_fsp = __copy_fs_struct(current->fs); if (!*new_fsp) return -ENOMEM; } |
cf2e340f4 [PATCH] unshare s... |
1463 1464 1465 1466 1467 |
return 0; } /* |
dae3c5a0b [PATCH] sys_unsha... |
1468 |
* Unsharing of sighand is not supported yet |
cf2e340f4 [PATCH] unshare s... |
1469 1470 1471 1472 |
*/ static int unshare_sighand(unsigned long unshare_flags, struct sighand_struct **new_sighp) { struct sighand_struct *sigh = current->sighand; |
dae3c5a0b [PATCH] sys_unsha... |
1473 |
if ((unshare_flags & CLONE_SIGHAND) && atomic_read(&sigh->count) > 1) |
cf2e340f4 [PATCH] unshare s... |
1474 1475 1476 1477 1478 1479 |
return -EINVAL; else return 0; } /* |
a0a7ec308 [PATCH] unshare s... |
1480 |
* Unshare vm if it is being shared |
cf2e340f4 [PATCH] unshare s... |
1481 1482 1483 1484 1485 1486 |
*/ static int unshare_vm(unsigned long unshare_flags, struct mm_struct **new_mmp) { struct mm_struct *mm = current->mm; if ((unshare_flags & CLONE_VM) && |
a0a7ec308 [PATCH] unshare s... |
1487 |
(mm && atomic_read(&mm->mm_users) > 1)) { |
2d61b8677 [PATCH] disable u... |
1488 |
return -EINVAL; |
a0a7ec308 [PATCH] unshare s... |
1489 |
} |
cf2e340f4 [PATCH] unshare s... |
1490 1491 |
return 0; |
cf2e340f4 [PATCH] unshare s... |
1492 1493 1494 |
} /* |
a016f3389 [PATCH] unshare s... |
1495 |
* Unshare file descriptor table if it is being shared |
cf2e340f4 [PATCH] unshare s... |
1496 1497 1498 1499 |
*/ static int unshare_fd(unsigned long unshare_flags, struct files_struct **new_fdp) { struct files_struct *fd = current->files; |
a016f3389 [PATCH] unshare s... |
1500 |
int error = 0; |
cf2e340f4 [PATCH] unshare s... |
1501 1502 |
if ((unshare_flags & CLONE_FILES) && |
a016f3389 [PATCH] unshare s... |
1503 1504 1505 1506 1507 |
(fd && atomic_read(&fd->count) > 1)) { *new_fdp = dup_fd(fd, &error); if (!*new_fdp) return error; } |
cf2e340f4 [PATCH] unshare s... |
1508 1509 1510 1511 1512 |
return 0; } /* |
cf2e340f4 [PATCH] unshare s... |
1513 1514 1515 1516 1517 1518 1519 |
* 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... |
1520 |
SYSCALL_DEFINE1(unshare, unsigned long, unshare_flags) |
cf2e340f4 [PATCH] unshare s... |
1521 1522 1523 |
{ int err = 0; struct fs_struct *fs, *new_fs = NULL; |
dae3c5a0b [PATCH] sys_unsha... |
1524 |
struct sighand_struct *new_sigh = NULL; |
cf2e340f4 [PATCH] unshare s... |
1525 1526 |
struct mm_struct *mm, *new_mm = NULL, *active_mm = NULL; struct files_struct *fd, *new_fd = NULL; |
cf7b708c8 Make access to ta... |
1527 |
struct nsproxy *new_nsproxy = NULL; |
9edff4ab1 ipc: sysvsem: imp... |
1528 |
int do_sysvsem = 0; |
cf2e340f4 [PATCH] unshare s... |
1529 1530 |
check_unshare_flags(&unshare_flags); |
06f9d4f94 [PATCH] unshare: ... |
1531 1532 1533 |
/* Return -EINVAL for all unsupported flags */ err = -EINVAL; if (unshare_flags & ~(CLONE_THREAD|CLONE_FS|CLONE_NEWNS|CLONE_SIGHAND| |
25b21cb2f [PATCH] IPC names... |
1534 |
CLONE_VM|CLONE_FILES|CLONE_SYSVSEM| |
18b6e0414 User namespaces: ... |
1535 |
CLONE_NEWUTS|CLONE_NEWIPC|CLONE_NEWNET)) |
06f9d4f94 [PATCH] unshare: ... |
1536 |
goto bad_unshare_out; |
6013f67fc ipc: sysvsem: for... |
1537 1538 1539 1540 1541 1542 |
/* * 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... |
1543 |
do_sysvsem = 1; |
cf2e340f4 [PATCH] unshare s... |
1544 1545 1546 1547 |
if ((err = unshare_thread(unshare_flags))) goto bad_unshare_out; if ((err = unshare_fs(unshare_flags, &new_fs))) goto bad_unshare_cleanup_thread; |
cf2e340f4 [PATCH] unshare s... |
1548 |
if ((err = unshare_sighand(unshare_flags, &new_sigh))) |
e3222c4ec Merge sys_clone()... |
1549 |
goto bad_unshare_cleanup_fs; |
cf2e340f4 [PATCH] unshare s... |
1550 1551 1552 1553 |
if ((err = unshare_vm(unshare_flags, &new_mm))) goto bad_unshare_cleanup_sigh; if ((err = unshare_fd(unshare_flags, &new_fd))) goto bad_unshare_cleanup_vm; |
e3222c4ec Merge sys_clone()... |
1554 1555 |
if ((err = unshare_nsproxy_namespaces(unshare_flags, &new_nsproxy, new_fs))) |
9edff4ab1 ipc: sysvsem: imp... |
1556 |
goto bad_unshare_cleanup_fd; |
c0b2fc316 [PATCH] uts: copy... |
1557 |
|
9edff4ab1 ipc: sysvsem: imp... |
1558 1559 1560 1561 1562 1563 1564 |
if (new_fs || new_mm || new_fd || do_sysvsem || new_nsproxy) { if (do_sysvsem) { /* * CLONE_SYSVSEM is equivalent to sys_exit(). */ exit_sem(current); } |
ab516013a [PATCH] namespace... |
1565 |
|
c0b2fc316 [PATCH] uts: copy... |
1566 |
if (new_nsproxy) { |
cf7b708c8 Make access to ta... |
1567 1568 |
switch_task_namespaces(current, new_nsproxy); new_nsproxy = NULL; |
c0b2fc316 [PATCH] uts: copy... |
1569 |
} |
cf2e340f4 [PATCH] unshare s... |
1570 |
|
cf7b708c8 Make access to ta... |
1571 |
task_lock(current); |
cf2e340f4 [PATCH] unshare s... |
1572 1573 1574 1575 1576 |
if (new_fs) { fs = current->fs; current->fs = new_fs; new_fs = fs; } |
cf2e340f4 [PATCH] unshare s... |
1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 |
if (new_mm) { mm = current->mm; active_mm = current->active_mm; current->mm = new_mm; current->active_mm = new_mm; activate_mm(active_mm, new_mm); new_mm = mm; } if (new_fd) { fd = current->files; current->files = new_fd; new_fd = fd; } task_unlock(current); } |
c0b2fc316 [PATCH] uts: copy... |
1594 |
if (new_nsproxy) |
444f378b2 Revert "[PATCH] n... |
1595 |
put_nsproxy(new_nsproxy); |
c0b2fc316 [PATCH] uts: copy... |
1596 |
|
cf2e340f4 [PATCH] unshare s... |
1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 |
bad_unshare_cleanup_fd: if (new_fd) put_files_struct(new_fd); bad_unshare_cleanup_vm: if (new_mm) mmput(new_mm); bad_unshare_cleanup_sigh: if (new_sigh) if (atomic_dec_and_test(&new_sigh->count)) kmem_cache_free(sighand_cachep, new_sigh); |
cf2e340f4 [PATCH] unshare s... |
1609 1610 1611 1612 1613 1614 1615 1616 |
bad_unshare_cleanup_fs: if (new_fs) put_fs_struct(new_fs); bad_unshare_cleanup_thread: bad_unshare_out: return err; } |
3b1253880 [PATCH] sanitize ... |
1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 |
/* * 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... |
1627 |
struct files_struct *copy = NULL; |
3b1253880 [PATCH] sanitize ... |
1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 |
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; } |