aboutsummaryrefslogtreecommitdiff
path: root/kernel
diff options
context:
space:
mode:
authorOleg Nesterov <oleg@redhat.com>2009-06-17 16:27:36 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-06-18 13:03:52 -0700
commite49612544c695117644af48bb4625264a3d2918f (patch)
tree7fe576d195533fb671c7a610cc35e9608e48c87e /kernel
parentd92656633b8352c6d4b14afcb7beb154d76e7aa6 (diff)
downloadlinux-2.6.34-ux500-e49612544c695117644af48bb4625264a3d2918f.tar.gz
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')
-rw-r--r--kernel/ptrace.c16
1 files changed, 6 insertions, 10 deletions
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index a64fe75a48b..61c78b2c07b 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;
}