[CRIU] [PATCH] signal: alternative way to send siginfo

[Andrey Vagin]

Modify *sigqueueinfo to allow send any siginfo to itself.

We can use this way instead of adding the operation write to signalfd.

Signed-off-by: Andrey Vagin <avagin at openvz.org>
---
 kernel/signal.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/kernel/signal.c b/kernel/signal.c
index 1d92d04..678b21f 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -2980,7 +2980,8 @@ SYSCALL_DEFINE3(rt_sigqueueinfo, pid_t, pid, int, sig,
 	/* Not even root can pretend to send signals from the kernel.
 	 * Nor can they impersonate a kill()/tgkill(), which adds source info.
 	 */
-	if (info.si_code >= 0 || info.si_code == SI_TKILL) {
+	if (((info.si_code >= 0 || info.si_code == SI_TKILL)) &&
+	    (task_pid_vnr(current) != pid)) {
 		/* We used to allow any < 0 si_code */
 		WARN_ON_ONCE(info.si_code < 0);
 		return -EPERM;
@@ -3000,7 +3001,8 @@ long do_rt_tgsigqueueinfo(pid_t tgid, pid_t pid, int sig, siginfo_t *info)
 	/* Not even root can pretend to send signals from the kernel.
 	 * Nor can they impersonate a kill()/tgkill(), which adds source info.
 	 */
-	if (info->si_code >= 0 || info->si_code == SI_TKILL) {
+	if ((info->si_code >= 0 || info->si_code == SI_TKILL) &&
+	    (task_pid_vnr(current) != pid)) {
 		/* We used to allow any < 0 si_code */
 		WARN_ON_ONCE(info->si_code < 0);
 		return -EPERM;
-- 
1.7.11.7