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

core/linux-kirkwood/PKGBUILD

@@ -8,7 +8,7 @@ _kernelname=${pkgbase#linux}
 _desc="Marvell Kirkwood"
 pkgver=4.3.3
 srcver=${pkgver%.0}
-pkgrel=1
+pkgrel=2
 cryptodev_commit=bc67142c57eadc0aafd0323ec527849012786643
 bfqver=v7r8
 
@@ -28,6 +28,7 @@ options=('!strip')
 
 source=("https://kernel.org/pub/linux/kernel/v4.x/linux-${srcver}.tar.xz"
         'archlinuxarm.patch'
+        'kernel-CVE-2016-0728.patch'
         'config'
         'mach-types::http://www.arm.linux.org.uk/developer/machines/download.php'
 	'0001-disable-mv643xx_eth-TSO.patch'
@@ -40,6 +41,7 @@ source=("https://kernel.org/pub/linux/kernel/v4.x/linux-${srcver}.tar.xz"
 
 md5sums=('f3068333fa524ff98914cf751d0b5710'
          'b91129f87c799e7184c00257eeddd2f2'
+         '6470e9783bd1c7a8feddc2d67f07afd5'
          'cfae749ec27515f0f5b4bb3fc3b7e885'
          '5faf5d5f9aadf621942bd03c3b993947'
          '09d44b9f07abfaeaf4f688ee52034786'
@@ -69,6 +71,7 @@ prepare() {
 
   msg2 "Add Arch Linux ARM patch for ARMv5te plug computers, mach-types"
   patch -Np1 -i "${srcdir}/archlinuxarm.patch"
+  patch -Np1 -i "${srcdir}/kernel-CVE-2016-0728.patch"
   cp "${srcdir}/mach-types" arch/arm/tools
 
   msg2 "Add BFQ patches"

core/linux-kirkwood/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
+