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linux-zedboard: kernel-CVE-2016-0728.patch

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This commit is contained in:
Jason Plum 2016-01-20 15:34:51 -05:00
parent 3305d1a3bf
commit 39664ce617
2 changed files with 87 additions and 1 deletions
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7
core/linux-zedboard/PKGBUILD
View file

@ -9,7 +9,7 @@ _srcname=linux-xlnx-${_commit}
_kernelname=${pkgbase#linux}
_desc="ZedBoard"
pkgver=3.19.0
pkgrel=2
pkgrel=3
arch=('armv7h')
url="https://github.com/Xilinx/linux-xlnx"
license=('GPL2')
@ -17,9 +17,11 @@ makedepends=('xmlto' 'docbook-xsl' 'kmod' 'inetutils' 'bc' 'uboot-mkimage' 'git'
options=('!strip')
source=("https://github.com/Xilinx/linux-xlnx/archive/${_commit}.tar.gz"
"git://git.code.sf.net/p/aufs/aufs3-standalone#branch=aufs${pkgver%.*}"
'kernel-CVE-2016-0728.patch'
'config')
md5sums=('a8c513775d714e5d6e7b0ed255920bf4'
'SKIP'
'6470e9783bd1c7a8feddc2d67f07afd5'
'8da8be2690c101b39394b31b4a89355b')
prepare() {
@ -27,6 +29,9 @@ prepare() {
cat "${srcdir}/config" > ./.config
# CVE-2016-0728
patch -Np1 -i ../kernel-CVE-2016-0728.patch
# AUFS patches
cp -ru "${srcdir}/aufs3-standalone/Documentation" .
cp -ru "${srcdir}/aufs3-standalone/fs" .

81
core/linux-zedboard/kernel-CVE-2016-0728.patch Normal file
View file

@ -0,0 +1,81 @@
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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