linux-armv5: kernel-CVE-2016-0728.patch

core/linux-armv5/PKGBUILD

@@ -8,7 +8,7 @@ _srcname=linux-4.4
 _kernelname=${pkgbase#linux}
 _desc="ARMv5 multi-platform"
 pkgver=4.4.0
-pkgrel=1
+pkgrel=2
 arch=('arm')
 url="http://www.kernel.org/"
 license=('GPL2')
@@ -19,11 +19,13 @@ source=("http://www.kernel.org/pub/linux/kernel/v4.x/${_srcname}.tar.xz"
         '0001-at91-ariag25-updates.patch'
         '0002-at91-arietta-g25-support.patch'
         '0003-net-smsc95xx-Allow-mac-address-to-be-set-as-a-parame.patch'
+        'kernel-CVE-2016-0728.patch'
         'config')
 md5sums=('9a78fa2eb6c68ca5a40ed5af08142599'
          'efc43501dde0e8fb9329c8ef762ffdf4'
          '8cf88daec8febbc1a0703c8a3bd6b25c'
          'd311439f7fb7cb067121812236bbad47'
+         '6470e9783bd1c7a8feddc2d67f07afd5'
          '328c76559533938021e2ebe49c9752a6')
 
 prepare() {
@@ -36,6 +38,7 @@ prepare() {
   git apply ../0001-at91-ariag25-updates.patch
   git apply ../0002-at91-arietta-g25-support.patch
   git apply ../0003-net-smsc95xx-Allow-mac-address-to-be-set-as-a-parame.patch
+  git apply ../kernel-CVE-2016-0728.patch
 
   cat "${srcdir}/config" > ./.config
 

core/linux-armv5/kernel-CVE-2016-0728.patch

@@ -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;
+ 	}
+-- 
+cgit v0.12
+