mirror of
https://github.com/Divested-Mobile/DivestOS-Build.git
synced 2024-12-24 23:19:31 -05:00
82 lines
2.1 KiB
Diff
82 lines
2.1 KiB
Diff
From 23567fd052a9abb6d67fe8e7a9ccdd9800a540f2 Mon Sep 17 00:00:00 2001
|
|
From: Yevgeny Pats <yevgeny@perception-point.io>
|
|
Date: Tue, 19 Jan 2016 22:09:04 +0000
|
|
Subject: KEYS: Fix keyring ref leak in join_session_keyring()
|
|
|
|
This fixes CVE-2016-0728.
|
|
|
|
If a thread is asked to join as a session keyring the keyring that's already
|
|
set as its session, we leak a keyring reference.
|
|
|
|
This can be tested with the following program:
|
|
|
|
#include <stddef.h>
|
|
#include <stdio.h>
|
|
#include <sys/types.h>
|
|
#include <keyutils.h>
|
|
|
|
int main(int argc, const char *argv[])
|
|
{
|
|
int i = 0;
|
|
key_serial_t serial;
|
|
|
|
serial = keyctl(KEYCTL_JOIN_SESSION_KEYRING,
|
|
"leaked-keyring");
|
|
if (serial < 0) {
|
|
perror("keyctl");
|
|
return -1;
|
|
}
|
|
|
|
if (keyctl(KEYCTL_SETPERM, serial,
|
|
KEY_POS_ALL | KEY_USR_ALL) < 0) {
|
|
perror("keyctl");
|
|
return -1;
|
|
}
|
|
|
|
for (i = 0; i < 100; i++) {
|
|
serial = keyctl(KEYCTL_JOIN_SESSION_KEYRING,
|
|
"leaked-keyring");
|
|
if (serial < 0) {
|
|
perror("keyctl");
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
If, after the program has run, there something like the following line in
|
|
/proc/keys:
|
|
|
|
3f3d898f I--Q--- 100 perm 3f3f0000 0 0 keyring leaked-keyring: empty
|
|
|
|
with a usage count of 100 * the number of times the program has been run,
|
|
then the kernel is malfunctioning. If leaked-keyring has zero usages or
|
|
has been garbage collected, then the problem is fixed.
|
|
|
|
Reported-by: Yevgeny Pats <yevgeny@perception-point.io>
|
|
Signed-off-by: David Howells <dhowells@redhat.com>
|
|
Acked-by: Don Zickus <dzickus@redhat.com>
|
|
Acked-by: Prarit Bhargava <prarit@redhat.com>
|
|
Acked-by: Jarod Wilson <jarod@redhat.com>
|
|
Signed-off-by: James Morris <james.l.morris@oracle.com>
|
|
---
|
|
security/keys/process_keys.c | 1 +
|
|
1 file changed, 1 insertion(+)
|
|
|
|
diff --git a/security/keys/process_keys.c b/security/keys/process_keys.c
|
|
index a3f85d2..e6d50172 100644
|
|
--- a/security/keys/process_keys.c
|
|
+++ b/security/keys/process_keys.c
|
|
@@ -794,6 +794,7 @@ long join_session_keyring(const char *name)
|
|
ret = PTR_ERR(keyring);
|
|
goto error2;
|
|
} else if (keyring == new->session_keyring) {
|
|
+ key_put(keyring);
|
|
ret = 0;
|
|
goto error2;
|
|
}
|
|
--
|
|
cgit v1.1
|
|
|