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authorEric W. Biederman <ebiederm@xmission.com>2006-03-28 16:10:58 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-28 18:36:40 -0800
commitfef23e7fbb11a0a78cd61935f7056bc2b237995a (patch)
treea6ff460b3a5d11d01c0532de561eb81183e056c2 /kernel
parentca9ba4471c1203bb6e759b76e83167fec54fe590 (diff)
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[PATCH] exec: allow init to exec from any thread.
After looking at the problem of init calling exec some more I figured out an easy way to make the code work. The actual symptom without out this patch is that all threads will die except pid == 1, and the thread calling exec. The thread calling exec will wait forever for pid == 1 to die. Since pid == 1 does not install a handler for SIGKILL it will never die. This modifies the tests for init from current->pid == 1 to the equivalent current == child_reaper. And then it causes exec in the ugly case to modify child_reaper. The only weird symptom is that you wind up with an init process that doesn't have the oldest start time on the box. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Cc: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/exit.c2
-rw-r--r--kernel/signal.c2
2 files changed, 2 insertions, 2 deletions
diff --git a/kernel/exit.c b/kernel/exit.c
index a8c7efc..223a880 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -807,7 +807,7 @@ fastcall NORET_TYPE void do_exit(long code)
panic("Aiee, killing interrupt handler!");
if (unlikely(!tsk->pid))
panic("Attempted to kill the idle task!");
- if (unlikely(tsk->pid == 1))
+ if (unlikely(tsk == child_reaper))
panic("Attempted to kill init!");
if (unlikely(current->ptrace & PT_TRACE_EXIT)) {
diff --git a/kernel/signal.c b/kernel/signal.c
index 75f7341..dc8f91b 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -1990,7 +1990,7 @@ relock:
continue;
/* Init gets no signals it doesn't want. */
- if (current->pid == 1)
+ if (current == child_reaper)
continue;
if (sig_kernel_stop(signr)) {