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authorMark H Weaver <mhw@netris.org>2016-01-20 13:04:35 -0500
committerMark H Weaver <mhw@netris.org>2016-01-20 13:23:42 -0500
commitbeed3af565fd6eb2eab45a1b970be8d8cd8437d5 (patch)
tree280c24630c3e655c64f0015506fb0fef0c624645 /gnu
parentd4df203292a6d0cda0e80103cb41f91bc7bac604 (diff)
downloadpatches-beed3af565fd6eb2eab45a1b970be8d8cd8437d5.tar
patches-beed3af565fd6eb2eab45a1b970be8d8cd8437d5.tar.gz
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.
Diffstat (limited to 'gnu')
-rw-r--r--gnu/packages/linux.scm6
-rw-r--r--gnu/packages/patches/linux-libre-CVE-2016-0728.patch84
2 files changed, 88 insertions, 2 deletions
diff --git a/gnu/packages/linux.scm b/gnu/packages/linux.scm
index 09014d6076..579df02c37 100644
--- a/gnu/packages/linux.scm
+++ b/gnu/packages/linux.scm
@@ -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)
diff --git a/gnu/packages/patches/linux-libre-CVE-2016-0728.patch b/gnu/packages/patches/linux-libre-CVE-2016-0728.patch
new file mode 100644
index 0000000000..254d6c1aea
--- /dev/null
+++ b/gnu/packages/patches/linux-libre-CVE-2016-0728.patch
@@ -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;
+ }
+--
+cgit v0.12
+