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authorOleg Nesterov <oleg@redhat.com>2009-12-15 16:47:24 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-12-16 07:20:09 -0800
commitdd34200adc01c5217ef09b55905b5c2312d65535 (patch)
tree7173ed6b5531086923a9221ef502f1dd2793c8a4 /kernel
parent614c517d7c00af1b26ded20646b329397d6f51a1 (diff)
downloadlwn-dd34200adc01c5217ef09b55905b5c2312d65535.tar.gz
lwn-dd34200adc01c5217ef09b55905b5c2312d65535.zip
signals: send_signal: use si_fromuser() to detect from_ancestor_ns
Change send_signal() to use si_fromuser(). From now SEND_SIG_NOINFO triggers the "from_ancestor_ns" check. This fixes reparent_thread()->group_send_sig_info(pdeath_signal) behaviour, before this patch send_signal() does not detect the cross-namespace case when the child of the dying parent belongs to the sub-namespace. This patch can affect the behaviour of send_sig(), kill_pgrp() and kill_pid() when the caller sends the signal to the sub-namespace with "priv == 0" but surprisingly all callers seem to use them correctly, including disassociate_ctty(on_exit). Except: drivers/staging/comedi/drivers/addi-data/*.c incorrectly use send_sig(priv => 0). But his is minor and should be fixed anyway. Reported-by: Daniel Lezcano <dlezcano@fr.ibm.com> Signed-off-by: Oleg Nesterov <oleg@redhat.com> Cc: Roland McGrath <roland@redhat.com> Reviewed-by: Sukadev Bhattiprolu <sukadev@us.ibm.com> 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.c5
1 files changed, 2 insertions, 3 deletions
diff --git a/kernel/signal.c b/kernel/signal.c
index a0ba428954b6..b65879d4e08f 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -960,9 +960,8 @@ static int send_signal(int sig, struct siginfo *info, struct task_struct *t,
int from_ancestor_ns = 0;
#ifdef CONFIG_PID_NS
- if (!is_si_special(info) && SI_FROMUSER(info) &&
- task_pid_nr_ns(current, task_active_pid_ns(t)) <= 0)
- from_ancestor_ns = 1;
+ from_ancestor_ns = si_fromuser(info) &&
+ !task_pid_nr_ns(current, task_active_pid_ns(t));
#endif
return __send_signal(sig, info, t, group, from_ancestor_ns);