KEYS: Fix keyring ref leak in join_session_keyring() (CVE-2016-0728)
This commit is contained in:
parent
e90dec2a0e
commit
e9490659aa
|
@ -26,6 +26,7 @@ linux (4.3.3-6) UNRELEASED; urgency=medium
|
|||
- allows use of register in udev to avoid "device_busy" error.
|
||||
- prevent crash on changing writeback_running
|
||||
- Change refill_dirty() to always scan entire disk if necessary
|
||||
* KEYS: Fix keyring ref leak in join_session_keyring() (CVE-2016-0728)
|
||||
|
||||
[ Salvatore Bonaccorso ]
|
||||
* unix: properly account for FDs passed over unix sockets (CVE-2013-4312)
|
||||
|
|
75
debian/patches/bugfix/all/KEYS-Fix-keyring-ref-leak-in-join_session_keyring.patch
vendored
Normal file
75
debian/patches/bugfix/all/KEYS-Fix-keyring-ref-leak-in-join_session_keyring.patch
vendored
Normal file
|
@ -0,0 +1,75 @@
|
|||
From 7ca88764d45c209791e8813131c1457c2e9e51e7 Mon Sep 17 00:00:00 2001
|
||||
From: Yevgeny Pats <yevgeny@perception-point.io>
|
||||
Date: Mon, 11 Jan 2016 12:05:28 +0000
|
||||
Subject: KEYS: Fix keyring ref leak in join_session_keyring()
|
||||
|
||||
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>
|
||||
---
|
||||
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;
|
||||
}
|
||||
--
|
||||
2.7.0.rc3
|
||||
|
|
@ -147,3 +147,4 @@ bugfix/all/bcache-unregister-reboot-notifier-if-bcache-fails-to.patch
|
|||
bugfix/all/bcache-allows-use-of-register-in-udev-to-avoid-devic.patch
|
||||
bugfix/all/bcache-prevent-crash-on-changing-writeback_running.patch
|
||||
bugfix/all/bcache-change-refill_dirty-to-always-scan-entire-dis.patch
|
||||
bugfix/all/KEYS-Fix-keyring-ref-leak-in-join_session_keyring.patch
|
||||
|
|
Loading…
Reference in New Issue