linux-am33x: kernel-CVE-2016-0728.patch

core/linux-am33x/PKGBUILD

@@ -8,7 +8,7 @@ _srcname=linux-4.4
 _kernelname=${pkgbase#linux}
 _desc="TI AM335x Beaglebone (Black)"
 pkgver=4.4.0
-pkgrel=2
+pkgrel=3
 rcnrel=bone2
 arch=('armv7h')
 url="http://www.kernel.org/"
@@ -19,10 +19,12 @@ source=("http://www.kernel.org/pub/linux/kernel/v4.x/${_srcname}.tar.xz"
         #"http://www.kernel.org/pub/linux/kernel/v4.x/patch-${pkgver}.xz"
         "http://rcn-ee.com/deb/sid-armhf/v${pkgver}-${rcnrel}/patch-${pkgver%.0}-${rcnrel}.diff.gz"
         "git+https://github.com/RobertCNelson/bb.org-overlays.git"
+        'kernel-CVE-2016-0728.patch'
         'config')
 md5sums=('9a78fa2eb6c68ca5a40ed5af08142599'
          '49c52784ef777e3c68e9eae306709a6b'
          'SKIP'
+         '6470e9783bd1c7a8feddc2d67f07afd5'
          '2057b469b7430c452fd750da4c590fe2')
 
 prepare() {
@@ -33,6 +35,7 @@ prepare() {
 
   # ALARM patches
   git apply "${srcdir}/patch-${pkgver%.0}-${rcnrel}.diff"
+  git apply "${srcdir}/kernel-CVE-2016-0728.patch"
 
   cat "${srcdir}/config" > ./.config
 

core/linux-am33x/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
+