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authorSukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>2009-04-03 01:58:09 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2009-04-03 04:04:58 +0200
commit6588c1e3ff01418acafd938db0740e3477dc8cb7 (patch)
treeb58beed5813667619be47c5d064f8f78804e92d1 /kernel
parentsignals: protect cinit from blocked fatal signals (diff)
downloadlinux-6588c1e3ff01418acafd938db0740e3477dc8cb7.tar.xz
linux-6588c1e3ff01418acafd938db0740e3477dc8cb7.zip
signals: SI_USER: Masquerade si_pid when crossing pid ns boundary
When sending a signal to a descendant namespace, set ->si_pid to 0 since the sender does not have a pid in the receiver's namespace. Note: - If rt_sigqueueinfo() sets si_code to SI_USER when sending a signal across a pid namespace boundary, the value in ->si_pid will be cleared to 0. Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Cc: Oleg Nesterov <oleg@tv-sign.ru> Cc: Roland McGrath <roland@redhat.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Daniel Lezcano <daniel.lezcano@free.fr> 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/signal.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/signal.c b/kernel/signal.c
index ba3da25f0eea..d8034737db4c 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -883,6 +883,8 @@ static int __send_signal(int sig, struct siginfo *info, struct task_struct *t,
break;
default:
copy_siginfo(&q->info, info);
+ if (from_ancestor_ns)
+ q->info.si_pid = 0;
break;
}
} else if (!is_si_special(info)) {