kernel: net: CVE-2015-2041

Fixes information leak in llc2_timeout_table.

References:
http://www.openwall.com/lists/oss-security/2015/02/20/19
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-2041

Upstream fix:
https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/
commit/?id=ecca64226ce2960280921e09ae33e90f82b5c408

Signed-off-by: Sona Sarmadi <sona.sarmadi@enea.com>
Signed-off-by: Tudor Florea <tudor.florea@enea.com>

2 files changed, 63 insertions, 0 deletions

diff --git a/recipes-kernel/linux/files/net-CVE-2015-2041.patch b/recipes-kernel/linux/files/net-CVE-2015-2041.patch
new file mode 100644
index 0000000..e0754cd
--- /dev/null
+++ b/recipes-kernel/linux/files/net-CVE-2015-2041.patch
@@ -0,0 +1,62 @@
+From ecca64226ce2960280921e09ae33e90f82b5c408 Mon Sep 17 00:00:00 2001
+From: Sasha Levin <sasha.levin@oracle.com>
+Date: Fri, 23 Jan 2015 20:47:00 -0500
+Subject: [PATCH] net: llc: use correct size for sysctl timeout entries
+
+commit 6b8d9117ccb4f81b1244aafa7bc70ef8fa45fc49 upstream.
+
+The timeout entries are sizeof(int) rather than sizeof(long), which
+means that when they were getting read we'd also leak kernel memory
+to userspace along with the timeout values.
+
+Fixes CVE-2015-2041
+Upstream-Status: Backport
+
+Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
+Signed-off-by: David S. Miller <davem@davemloft.net>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+Signed-off-by: Sona Sarmadi <sona.sarmadi@enea.com>
+---
+ net/llc/sysctl_net_llc.c | 8 ++++----
+ 1 file changed, 4 insertions(+), 4 deletions(-)
+
+diff --git a/net/llc/sysctl_net_llc.c b/net/llc/sysctl_net_llc.c
+index 612a5dd..799bafc 100644
+--- a/net/llc/sysctl_net_llc.c
++++ b/net/llc/sysctl_net_llc.c
+@@ -18,28 +18,28 @@ static struct ctl_table llc2_timeout_table[] = {
+        {
+                .procname       = "ack",
+                .data           = &sysctl_llc2_ack_timeout,
+-               .maxlen         = sizeof(long),
++               .maxlen         = sizeof(sysctl_llc2_ack_timeout),
+                .mode           = 0644,
+                .proc_handler   = proc_dointvec_jiffies,
+        },
+        {
+                .procname       = "busy",
+                .data           = &sysctl_llc2_busy_timeout,
+-               .maxlen         = sizeof(long),
++               .maxlen         = sizeof(sysctl_llc2_busy_timeout),
+                .mode           = 0644,
+                .proc_handler   = proc_dointvec_jiffies,
+        },
+        {
+                .procname       = "p",
+                .data           = &sysctl_llc2_p_timeout,
+-               .maxlen         = sizeof(long),
++               .maxlen         = sizeof(sysctl_llc2_p_timeout),
+                .mode           = 0644,
+                .proc_handler   = proc_dointvec_jiffies,
+        },
+        {
+                .procname       = "rej",
+                .data           = &sysctl_llc2_rej_timeout,
+-               .maxlen         = sizeof(long),
++               .maxlen         = sizeof(sysctl_llc2_rej_timeout),
+                .mode           = 0644,
+                .proc_handler   = proc_dointvec_jiffies,
+        },
+-- 
+1.9.1
+
diff --git a/recipes-kernel/linux/linux-yocto_3.14.bbappend b/recipes-kernel/linux/linux-yocto_3.14.bbappend
index bab3136..5b7cdf3 100644
--- a/recipes-kernel/linux/linux-yocto_3.14.bbappend
+++ b/recipes-kernel/linux/linux-yocto_3.14.bbappend
@@ -3,4 +3,5 @@ FILESEXTRAPATHS_prepend := "${THISDIR}/files:"
 SRC_URI += "file://HID_CVE_patches/0005-HID-steelseries-validate-output-report-details.patch \
             file://keys-CVE-2015-1333.patch \
             file://udp_fix_behavior_of_wrong_checksums.patch \
+            file://net-CVE-2015-2041.patch \
            "