auxv: require the target to be tracable (or yourself)
 

From: Al Viro <viro@zeniv.linux.org.uk>

same as for environ, except that we didn't do any checks to
prevent access after suid execve

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

(cherry picked from commit 2fadaef41283aad7100fa73f01998cddaca25833)
CVE-2011-1020
BugLink: http://bugs.launchpad.net/bugs/813026
Signed-off-by: Andy Whitcroft <apw@canonical.com>
---
fs/proc/base.c | 6 +++---
1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/fs/proc/base.c b/fs/proc/base.c
index 1953009..331c4f6 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -280,9 +280,9 @@ out:

static int proc_pid_auxv(struct task_struct *task, char *buffer)
{
- int res = 0;
- struct mm_struct *mm = get_task_mm(task);
- if (mm) {
+ struct mm_struct *mm = mm_for_maps(task);
+ int res = PTR_ERR(mm);
+ if (mm && !IS_ERR(mm)) {
unsigned int nwords = 0;
do {
nwords += 2;
--
1.7.4.1


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