diff options
| author | Kees Cook <keescook@chromium.org> | 2012-08-27 11:38:13 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-10-07 08:32:28 -0700 |
| commit | 7d0fcfec4c491eb3c815929be5512ae8d1886553 (patch) | |
| tree | 0312f1815213f82535b26c5141f5f7b00f87a8f5 | |
| parent | 56a631f3bf36641133afeb3db7c1ec5721c8dd04 (diff) | |
Yama: handle 32-bit userspace prctl
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 <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>
| -rw-r--r-- | security/yama/yama_lsm.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/security/yama/yama_lsm.c b/security/yama/yama_lsm.c index 573723843a0..1d6bf24c117 100644 --- a/security/yama/yama_lsm.c +++ b/security/yama/yama_lsm.c @@ -138,7 +138,7 @@ static int yama_task_prctl(int option, unsigned long arg2, unsigned long arg3, 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; |