Piteball/android_kernel_google_msm
1
0
Fork 0
mirror of https://github.com/followmsi/android_kernel_google_msm.git synced 2024-11-06 23:17:41 +00:00
Code Issues Projects Releases Wiki Activity

Yama: handle 32-bit userspace prctl

Browse source 
commit 2e4930eb7c 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 <keescook@chromium.org>
Acked-by: John Johansen <john.johansen@canonical.com>
Signed-off-by: James Morris <james.l.morris@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Kees Cook 2012-08-27 11:38:13 -07:00 committed by Greg Kroah-Hartman
parent 56a631f3bf
commit 7d0fcfec4c
1 changed files with 1 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
security/yama/yama_lsm.c
View file

@ -138,7 +138,7 @@ static int yama_task_prctl(int option, unsigned long arg2, unsigned long arg3,
if (arg2 == 0) { if (arg2 == 0) {
yama_ptracer_del(NULL, myself); yama_ptracer_del(NULL, myself);
rc = 0; 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); rc = yama_ptracer_add(NULL, myself);
} else { } else {
struct task_struct *tracer; struct task_struct *tracer;