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| author | Oleg Nesterov <oleg@redhat.com> | 2010-03-10 15:23:09 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-03-12 15:52:40 -0800 |
| commit | 13aa9a6b0f2371d2ce0de57c2ede62ab7a787157 (patch) | |
| tree | cf6e3d79a3defc5a291575aa26a5405d9815a5a5 | |
| parent | 6edb6764409392836b44a61b06d94954efd6200f (diff) | |
| download | op-kernel-dev-13aa9a6b0f2371d2ce0de57c2ede62ab7a787157.zip op-kernel-dev-13aa9a6b0f2371d2ce0de57c2ede62ab7a787157.tar.gz | |
pid_ns: zap_pid_ns_processes: use SEND_SIG_NOINFO instead of force_sig()
zap_pid_ns_processes() uses force_sig(SIGKILL) to ensure SIGKILL will be
delivered to sub-namespace inits as well. This is correct, but we are
going to change force_sig_info() semantics. See
http://bugzilla.kernel.org/show_bug.cgi?id=15395#c31
We can use send_sig_info(SEND_SIG_NOINFO) instead, since
614c517d7c00af1b26ded20646b329397d6f51a1 ("signals: SEND_SIG_NOINFO should
be considered as SI_FROMUSER()") SEND_SIG_NOINFO means "from user" and
therefore send_signal() will get the correct from_ancestor_ns = T flag.
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Acked-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | kernel/pid_namespace.c | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/kernel/pid_namespace.c b/kernel/pid_namespace.c index 86b3796..79aac93 100644 --- a/kernel/pid_namespace.c +++ b/kernel/pid_namespace.c @@ -161,13 +161,12 @@ void zap_pid_ns_processes(struct pid_namespace *pid_ns) rcu_read_lock(); /* - * Use force_sig() since it clears SIGNAL_UNKILLABLE ensuring - * any nested-container's init processes don't ignore the - * signal + * Any nested-container's init processes won't ignore the + * SEND_SIG_NOINFO signal, see send_signal()->si_fromuser(). */ task = pid_task(find_vpid(nr), PIDTYPE_PID); if (task) - force_sig(SIGKILL, task); + send_sig_info(SIGKILL, SEND_SIG_NOINFO, task); rcu_read_unlock(); |
