3.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Kees Cook <keesc...@chromium.org>
commit 2e4930eb7c8fb20a39dfb5f8a8f80402710dcea8 upstream.
When running a 64-bit kernel and receiving prctls from a 32-bit
userspace, the "-1" used as an unsigned long will end up being
misdetected. The kernel is looking for 0xffffffffffffffff instead of
0xffffffff. Since prctl lacks a distinct compat interface, Yama needs
to handle this translation itself. As such, support either value as
meaning PR_SET_PTRACER_ANY, to avoid breaking the ABI for 64-bit.
Signed-off-by: Kees Cook <keesc...@chromium.org>
Acked-by: John Johansen <john.johan...@canonical.com>
Signed-off-by: James Morris <james.l.mor...@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
security/yama/yama_lsm.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/security/yama/yama_lsm.c
+++ b/security/yama/yama_lsm.c
@@ -143,7 +143,7 @@ static int yama_task_prctl(int option, u
if (arg2 == 0) {
yama_ptracer_del(NULL, myself);
rc = 0;
- } else if (arg2 == PR_SET_PTRACER_ANY) {
+ } else if (arg2 == PR_SET_PTRACER_ANY || (int)arg2 == -1) {
rc = yama_ptracer_add(NULL, myself);
} else {
struct task_struct *tracer;
--
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