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authorOleg Nesterov <oleg@tv-sign.ru>2006-02-15 22:50:10 +0300
committerLinus Torvalds <torvalds@g5.osdl.org>2006-02-15 11:05:43 -0800
commit5ecfbae093f0c37311e89b29bfc0c9d586eace87 (patch)
treeeabd0a145af64e26c900578c95175ab313828661 /kernel
parentdadac81b1b86196fcc48fb87620403c4a7174f06 (diff)
downloadlwn-5ecfbae093f0c37311e89b29bfc0c9d586eace87.tar.gz
lwn-5ecfbae093f0c37311e89b29bfc0c9d586eace87.zip
[PATCH] fix zap_thread's ptrace related problems
1. The tracee can go from ptrace_stop() to do_signal_stop() after __ptrace_unlink(p). 2. It is unsafe to __ptrace_unlink(p) while p->parent may wait for tasklist_lock in ptrace_detach(). Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Cc: Roland McGrath <roland@redhat.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Christoph Hellwig <hch@lst.de> Cc: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/ptrace.c25
1 files changed, 15 insertions, 10 deletions
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index d2cf144d0af5..d95a72c9279d 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -72,8 +72,8 @@ void ptrace_untrace(task_t *child)
*/
void __ptrace_unlink(task_t *child)
{
- if (!child->ptrace)
- BUG();
+ BUG_ON(!child->ptrace);
+
child->ptrace = 0;
if (!list_empty(&child->ptrace_list)) {
list_del_init(&child->ptrace_list);
@@ -184,22 +184,27 @@ bad:
return retval;
}
+void __ptrace_detach(struct task_struct *child, unsigned int data)
+{
+ child->exit_code = data;
+ /* .. re-parent .. */
+ __ptrace_unlink(child);
+ /* .. and wake it up. */
+ if (child->exit_state != EXIT_ZOMBIE)
+ wake_up_process(child);
+}
+
int ptrace_detach(struct task_struct *child, unsigned int data)
{
if (!valid_signal(data))
- return -EIO;
+ return -EIO;
/* Architecture-specific hardware disable .. */
ptrace_disable(child);
- /* .. re-parent .. */
- child->exit_code = data;
-
write_lock_irq(&tasklist_lock);
- __ptrace_unlink(child);
- /* .. and wake it up. */
- if (child->exit_state != EXIT_ZOMBIE)
- wake_up_process(child);
+ if (child->ptrace)
+ __ptrace_detach(child, data);
write_unlock_irq(&tasklist_lock);
return 0;