Messages in this thread Patch in this message | | | Date | Thu, 23 Oct 2008 08:49:28 -0700 | From | sukadev@linux ... | Subject | [PATCH] 'kill sig -1' must only apply to caller's namespace |
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From: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Subject: [PATCH] 'kill sig -1' must only apply to caller's namespace
Currently "kill <sig> -1" kills processes in all namespaces and breaks the isolation of namespaces. Earlier attempt to fix this was discussed at:
http://lkml.org/lkml/2008/7/23/148
As suggested by Oleg Nesterov in that thread, use "task_pid_vnr() > 1" check since task_pid_vnr() returns 0 if process is outside the caller's namespace.
Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Acked-by: Eric W. Biederman <ebiederm@xmission.com> Tested-by: Daniel Hokka Zakrisson <daniel@hozac.com> --- kernel/signal.c | 3 ++- 1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/kernel/signal.c b/kernel/signal.c index 105217d..4530fc6 100644 --- a/kernel/signal.c +++ b/kernel/signal.c @@ -1144,7 +1144,8 @@ static int kill_something_info(int sig, struct siginfo *info, pid_t pid) struct task_struct * p; for_each_process(p) { - if (p->pid > 1 && !same_thread_group(p, current)) { + if (task_pid_vnr(p) > 1 && + !same_thread_group(p, current)) { int err = group_send_sig_info(sig, info, p); ++count; if (err != -EPERM) -- 1.5.2.5
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