The patch titled
Subject: kernel/signal.c: stop info leak via the tkill and the tgkill
syscalls
has been added to the -mm tree. Its filename is
signal-stop-info-leak-via-the-tkill-and-the-tgkill-syscalls.patch
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------------------------------------------------------
From: Emese Revfy <[email protected]>
Subject: kernel/signal.c: stop info leak via the tkill and the tgkill syscalls
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 <[email protected]>
Reviewed-by: PaX Team <[email protected]>
Signed-off-by: Kees Cook <[email protected]>
Cc: Al Viro <[email protected]>
Cc: Oleg Nesterov <[email protected]>
Cc: "Eric W. Biederman" <[email protected]>
Cc: Serge Hallyn <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
---
kernel/signal.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN
kernel/signal.c~signal-stop-info-leak-via-the-tkill-and-the-tgkill-syscalls
kernel/signal.c
---
a/kernel/signal.c~signal-stop-info-leak-via-the-tkill-and-the-tgkill-syscalls
+++ a/kernel/signal.c
@@ -2949,7 +2949,7 @@ 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 -mm which might be from [email protected] are
signal-stop-info-leak-via-the-tkill-and-the-tgkill-syscalls.patch
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