linux-kernel - [17/74] Relax si_code check in rt_sigqueueinfo and rt

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Date:	Wed, 13 Apr 2011 08:50:41 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Julien Tinnes <jln@...gle.com>,
	Roland Dreier <roland@...estorage.com>
Subject: [17/74] Relax si_code check in rt_sigqueueinfo and rt_tgsigqueueinfo

2.6.32-longterm review patch.  If anyone has any objections, please let us know.

------------------

From: Roland Dreier <roland@...estorage.com>

commit 243b422af9ea9af4ead07a8ad54c90d4f9b6081a upstream.

Commit da48524eb206 ("Prevent rt_sigqueueinfo and rt_tgsigqueueinfo
from spoofing the signal code") made the check on si_code too strict.
There are several legitimate places where glibc wants to queue a
negative si_code different from SI_QUEUE:

 - This was first noticed with glibc's aio implementation, which wants
   to queue a signal with si_code SI_ASYNCIO; the current kernel
   causes glibc's tst-aio4 test to fail because rt_sigqueueinfo()
   fails with EPERM.

 - Further examination of the glibc source shows that getaddrinfo_a()
   wants to use SI_ASYNCNL (which the kernel does not even define).
   The timer_create() fallback code wants to queue signals with SI_TIMER.

As suggested by Oleg Nesterov <oleg@...hat.com>, loosen the check to
forbid only the problematic SI_TKILL case.

Reported-by: Klaus Dittrich <kladit@...or.de>
Acked-by: Julien Tinnes <jln@...gle.com>
Signed-off-by: Roland Dreier <roland@...estorage.com>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 kernel/signal.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -2353,7 +2353,7 @@ SYSCALL_DEFINE3(rt_sigqueueinfo, pid_t,
 	/* Not even root can pretend to send signals from the kernel.
 	 * Nor can they impersonate a kill()/tgkill(), which adds source info.
 	 */
-	if (info.si_code != SI_QUEUE) {
+	if (info.si_code >= 0 || info.si_code == SI_TKILL) {
 		/* We used to allow any < 0 si_code */
 		WARN_ON_ONCE(info.si_code < 0);
 		return -EPERM;
@@ -2373,7 +2373,7 @@ long do_rt_tgsigqueueinfo(pid_t tgid, pi
 	/* Not even root can pretend to send signals from the kernel.
 	 * Nor can they impersonate a kill()/tgkill(), which adds source info.
 	 */
-	if (info->si_code != SI_QUEUE) {
+	if (info->si_code >= 0 || info->si_code == SI_TKILL) {
 		/* We used to allow any < 0 si_code */
 		WARN_ON_ONCE(info->si_code < 0);
 		return -EPERM;


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