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gnu: linux-libre: Add fix for CVE-2016-0728. 

* gnu/packages/patches/linux-libre-CVE-2016-0728.patch: New file.
* gnu-system.am (dist_patch_DATA): Add it.
* gnu/packages/linux.scm (linux-libre)[source]: Add patch.
This commit is contained in:
Mark H Weaver 2016-01-20 13:04:35 -05:00
parent d4df203292
commit beed3af565
3 changed files with 90 additions and 3 deletions
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3
gnu-system.am
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@ -1,7 +1,7 @@
# GNU Guix --- Functional package management for GNU
# Copyright © 2012, 2013, 2014, 2015 Ludovic Courtès <ludo@gnu.org>
# Copyright © 2013, 2014, 2015, 2016 Andreas Enge <andreas@enge.fr>
# Copyright © 2013, 2014, 2015 Mark H Weaver <mhw@netris.org>
# Copyright © 2013, 2014, 2015, 2016 Mark H Weaver <mhw@netris.org>
#
# This file is part of GNU Guix.
#
@ -565,6 +565,7 @@ dist_patch_DATA = \
gnu/packages/patches/libwmf-CVE-2015-4695.patch \
gnu/packages/patches/libwmf-CVE-2015-4696.patch \
gnu/packages/patches/libxslt-CVE-2015-7995.patch \
gnu/packages/patches/linux-libre-CVE-2016-0728.patch \
gnu/packages/patches/lirc-localstatedir.patch \
gnu/packages/patches/libpthread-glibc-preparation.patch \
gnu/packages/patches/lm-sensors-hwmon-attrs.patch \

6
gnu/packages/linux.scm
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@ -2,7 +2,7 @@
;;; Copyright © 2012, 2013, 2014, 2015 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2013, 2014, 2015 Andreas Enge <andreas@enge.fr>
;;; Copyright © 2012 Nikita Karetnikov <nikita@karetnikov.org>
;;; Copyright © 2014, 2015 Mark H Weaver <mhw@netris.org>
;;; Copyright © 2014, 2015, 2016 Mark H Weaver <mhw@netris.org>
;;; Copyright © 2015 Federico Beffa <beffa@fbengineering.ch>
;;; Copyright © 2015 Taylan Ulrich Bayırlı/Kammer <taylanbayirli@gmail.com>
;;; Copyright © 2015 Efraim Flashner <efraim@flashner.co.il>
@ -286,7 +286,9 @@ for SYSTEM, or #f if there is no configuration for SYSTEM."
(uri (linux-libre-urls version))
(sha256
(base32
"1839xsaifs7vvyblzin8jps0gqi10xmz1l9p4x0j27vmdj39jgpm"))))
"1839xsaifs7vvyblzin8jps0gqi10xmz1l9p4x0j27vmdj39jgpm"))
(patches
(list (search-patch "linux-libre-CVE-2016-0728.patch")))))
(build-system gnu-build-system)
(supported-systems '("x86_64-linux" "i686-linux"))
(native-inputs `(("perl" ,perl)

84
gnu/packages/patches/linux-libre-CVE-2016-0728.patch Normal file
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@ -0,0 +1,84 @@
Copied from
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/patch/?id=23567fd052a9abb6d67fe8e7a9ccdd9800a540f2
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;
}
--
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