This is a note to let you know that I've just added the patch titled kernel/signal.c: stop info leak via the tkill and the tgkill syscalls to the 3.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: kernel-signal.c-stop-info-leak-via-the-tkill-and-the-tgkill-syscalls.patch and it can be found in the queue-3.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From b9e146d8eb3b9ecae5086d373b50fa0c1f3e7f0f Mon Sep 17 00:00:00 2001 From: Emese Revfy <re.emese@xxxxxxxxx> Date: Wed, 17 Apr 2013 15:58:36 -0700 Subject: kernel/signal.c: stop info leak via the tkill and the tgkill syscalls From: Emese Revfy <re.emese@xxxxxxxxx> commit b9e146d8eb3b9ecae5086d373b50fa0c1f3e7f0f upstream. This fixes a kernel memory contents leak via the tkill and tgkill syscalls for compat processes. This is visible in the siginfo_t->_sifields._rt.si_sigval.sival_ptr field when handling signals delivered from tkill. The place of the infoleak: int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from) { ... put_user_ex(ptr_to_compat(from->si_ptr), &to->si_ptr); ... } Signed-off-by: Emese Revfy <re.emese@xxxxxxxxx> Reviewed-by: PaX Team <pageexec@xxxxxxxxxxx> Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx> Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx> Cc: Oleg Nesterov <oleg@xxxxxxxxxx> Cc: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx> Cc: Serge Hallyn <serge.hallyn@xxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- kernel/signal.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/kernel/signal.c +++ b/kernel/signal.c @@ -2867,7 +2867,7 @@ do_send_specific(pid_t tgid, pid_t pid, static int do_tkill(pid_t tgid, pid_t pid, int sig) { - struct siginfo info; + struct siginfo info = {}; info.si_signo = sig; info.si_errno = 0; Patches currently in stable-queue which might be from re.emese@xxxxxxxxx are queue-3.4/kernel-signal.c-stop-info-leak-via-the-tkill-and-the-tgkill-syscalls.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html