diff options
author | Roland Dreier <[email protected]> | 2011-03-28 14:13:35 -0700 |
---|---|---|
committer | Linus Torvalds <[email protected]> | 2011-03-28 15:45:44 -0700 |
commit | 243b422af9ea9af4ead07a8ad54c90d4f9b6081a (patch) | |
tree | bdcd77b51cce8bd2ed5fcc41c6b430a8d6a9d74f | |
parent | 5847098cd896c92819800e17e983bf6530035209 (diff) |
Relax si_code check in rt_sigqueueinfo and rt_tgsigqueueinfo
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 <[email protected]>, loosen the check to
forbid only the problematic SI_TKILL case.
Reported-by: Klaus Dittrich <[email protected]>
Acked-by: Julien Tinnes <[email protected]>
Cc: <[email protected]>
Signed-off-by: Roland Dreier <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
-rw-r--r-- | kernel/signal.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/signal.c b/kernel/signal.c index 324eff5468ad..1186cf7fac77 100644 --- a/kernel/signal.c +++ b/kernel/signal.c @@ -2437,7 +2437,7 @@ SYSCALL_DEFINE3(rt_sigqueueinfo, pid_t, pid, int, sig, /* 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; @@ -2457,7 +2457,7 @@ long do_rt_tgsigqueueinfo(pid_t tgid, pid_t pid, int sig, siginfo_t *info) /* 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; |