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| author | Oleg Nesterov <oleg@redhat.com> | 2009-06-17 16:27:36 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-06-18 13:03:52 -0700 |
| commit | e49612544c695117644af48bb4625264a3d2918f (patch) | |
| tree | 7fe576d195533fb671c7a610cc35e9608e48c87e /kernel/ptrace.c | |
| parent | d92656633b8352c6d4b14afcb7beb154d76e7aa6 (diff) | |
| download | linux-stable-e49612544c695117644af48bb4625264a3d2918f.tar.gz linux-stable-e49612544c695117644af48bb4625264a3d2918f.tar.bz2 linux-stable-e49612544c695117644af48bb4625264a3d2918f.zip | |
ptrace: don't take tasklist to get/set ->last_siginfo
Change ptrace_getsiginfo/ptrace_setsiginfo to use lock_task_sighand()
without tasklist_lock. Perhaps it makes sense to make a single helper
with "bool rw" argument.
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/ptrace.c')
| -rw-r--r-- | kernel/ptrace.c | 16 |
1 files changed, 6 insertions, 10 deletions
diff --git a/kernel/ptrace.c b/kernel/ptrace.c index a64fe75a48ba..61c78b2c07ba 100644 --- a/kernel/ptrace.c +++ b/kernel/ptrace.c @@ -424,37 +424,33 @@ static int ptrace_setoptions(struct task_struct *child, long data) static int ptrace_getsiginfo(struct task_struct *child, siginfo_t *info) { + unsigned long flags; int error = -ESRCH; - read_lock(&tasklist_lock); - if (likely(child->sighand != NULL)) { + if (lock_task_sighand(child, &flags)) { error = -EINVAL; - spin_lock_irq(&child->sighand->siglock); if (likely(child->last_siginfo != NULL)) { *info = *child->last_siginfo; error = 0; } - spin_unlock_irq(&child->sighand->siglock); + unlock_task_sighand(child, &flags); } - read_unlock(&tasklist_lock); return error; } static int ptrace_setsiginfo(struct task_struct *child, const siginfo_t *info) { + unsigned long flags; int error = -ESRCH; - read_lock(&tasklist_lock); - if (likely(child->sighand != NULL)) { + if (lock_task_sighand(child, &flags)) { error = -EINVAL; - spin_lock_irq(&child->sighand->siglock); if (likely(child->last_siginfo != NULL)) { *child->last_siginfo = *info; error = 0; } - spin_unlock_irq(&child->sighand->siglock); + unlock_task_sighand(child, &flags); } - read_unlock(&tasklist_lock); return error; } |