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author | Oleg Nesterov <oleg@tv-sign.ru> | 2005-11-23 13:37:43 -0800 |
---|---|---|
committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-11-23 16:08:39 -0800 |
commit | 962b564cf1ec8041e8890a3c3847e3a630a08f42 (patch) | |
tree | a238616355c02496177e486d78f9a75911e943b6 /fs/exec.c | |
parent | 8bf1101bd52573e0573e374d56d2feecdbb5e444 (diff) | |
download | kernel_samsung_smdk4412-962b564cf1ec8041e8890a3c3847e3a630a08f42.zip kernel_samsung_smdk4412-962b564cf1ec8041e8890a3c3847e3a630a08f42.tar.gz kernel_samsung_smdk4412-962b564cf1ec8041e8890a3c3847e3a630a08f42.tar.bz2 |
[PATCH] fix do_wait() vs exec() race
When non-leader thread does exec, de_thread adds old leader to the init's
->children list in EXIT_ZOMBIE state and drops tasklist_lock.
This means that release_task(leader) in de_thread() is racy vs do_wait()
from init task.
I think de_thread() should set old leader's state to EXIT_DEAD instead.
Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: george anzinger <george@mvista.com>
Cc: Roland Dreier <rolandd@cisco.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Linus Torvalds <torvalds@osdl.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs/exec.c')
-rw-r--r-- | fs/exec.c | 8 |
1 files changed, 4 insertions, 4 deletions
@@ -668,7 +668,7 @@ static inline int de_thread(struct task_struct *tsk) if (!thread_group_leader(current)) { struct task_struct *parent; struct dentry *proc_dentry1, *proc_dentry2; - unsigned long exit_state, ptrace; + unsigned long ptrace; /* * Wait for the thread group leader to be a zombie. @@ -726,15 +726,15 @@ static inline int de_thread(struct task_struct *tsk) list_del(¤t->tasks); list_add_tail(¤t->tasks, &init_task.tasks); current->exit_signal = SIGCHLD; - exit_state = leader->exit_state; + + BUG_ON(leader->exit_state != EXIT_ZOMBIE); + leader->exit_state = EXIT_DEAD; write_unlock_irq(&tasklist_lock); spin_unlock(&leader->proc_lock); spin_unlock(¤t->proc_lock); proc_pid_flush(proc_dentry1); proc_pid_flush(proc_dentry2); - - BUG_ON(exit_state != EXIT_ZOMBIE); } /* |