The patch titled
signals: SI_USER: Masquerade si_pid when crossing pid ns boundary
has been added to the -mm tree. Its filename is
signals-si_user-masquerade-si_pid-when-crossing-pid-ns-boundary.patch
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------------------------------------------------------
Subject: signals: SI_USER: Masquerade si_pid when crossing pid ns boundary
From: Sukadev Bhattiprolu <sukadev@xxxxxxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Roland McGrath <roland@xxxxxxxxxx>
Cc: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
Cc: Daniel Lezcano <daniel.lezcano@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/signal.c | 2 ++
1 file changed, 2 insertions(+)
diff -puN kernel/signal.c~signals-si_user-masquerade-si_pid-when-crossing-pid-ns-boundary kernel/signal.c
--- a/kernel/signal.c~signals-si_user-masquerade-si_pid-when-crossing-pid-ns-boundary
+++ a/kernel/signal.c
@@ -883,6 +883,8 @@ static int __send_signal(int sig, struct
break;
default:
copy_siginfo(&q->info, info);
+ if (from_ancestor_ns)
+ q->info.si_pid = 0;
break;
}
} else if (!is_si_special(info)) {
_
Patches currently in -mm which might be from sukadev@xxxxxxxxxxxxxxxxxx are
vfs-simple_set_mnt-should-return-void.patch
devpts-must-release-s_umount-on-error.patch
signals-remove-handler-parameter-to-tracehook-functions.patch
signals-protect-init-from-unwanted-signals-more.patch
signals-add-from_ancestor_ns-parameter-to-send_signal.patch
signals-protect-cinit-from-unblocked-sig_dfl-signals.patch
signals-zap_pid_ns_process-should-use-force_sig.patch
signals-protect-cinit-from-blocked-fatal-signals.patch
signals-si_user-masquerade-si_pid-when-crossing-pid-ns-boundary.patch
pids-document-task_pgrp-task_session-is-not-safe-without-tasklist-rcu.patch
pids-document-task_pgrp-task_session-is-not-safe-without-tasklist-rcu-fix.patch
pids-improve-get_task_pid-to-fix-the-unsafe-sys_wait4-task_pgrp.patch
pids-refactor-vnr-nr_ns-helpers-to-make-them-safe.patch
pids-kill-now-unused-signal_struct-__pgrp-__session-and-friends.patch
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