This is a note to let you know that I've just added the patch titled
openvswitch: fix flow actions reallocation
to the 4.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
openvswitch-fix-flow-actions-reallocation.patch
and it can be found in the queue-4.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Mon Apr 15 07:47:06 CEST 2019
From: Andrea Righi <andrea.righi@xxxxxxxxxxxxx>
Date: Thu, 28 Mar 2019 07:36:00 +0100
Subject: openvswitch: fix flow actions reallocation
From: Andrea Righi <andrea.righi@xxxxxxxxxxxxx>
[ Upstream commit f28cd2af22a0c134e4aa1c64a70f70d815d473fb ]
The flow action buffer can be resized if it's not big enough to contain
all the requested flow actions. However, this resize doesn't take into
account the new requested size, the buffer is only increased by a factor
of 2x. This might be not enough to contain the new data, causing a
buffer overflow, for example:
[ 42.044472] =============================================================================
[ 42.045608] BUG kmalloc-96 (Not tainted): Redzone overwritten
[ 42.046415] -----------------------------------------------------------------------------
[ 42.047715] Disabling lock debugging due to kernel taint
[ 42.047716] INFO: 0x8bf2c4a5-0x720c0928. First byte 0x0 instead of 0xcc
[ 42.048677] INFO: Slab 0xbc6d2040 objects=29 used=18 fp=0xdc07dec4 flags=0x2808101
[ 42.049743] INFO: Object 0xd53a3464 @offset=2528 fp=0xccdcdebb
[ 42.050747] Redzone 76f1b237: cc cc cc cc cc cc cc cc ........
[ 42.051839] Object d53a3464: 6b 6b 6b 6b 6b 6b 6b 6b 0c 00 00 00 6c 00 00 00 kkkkkkkk....l...
[ 42.053015] Object f49a30cc: 6c 00 0c 00 00 00 00 00 00 00 00 03 78 a3 15 f6 l...........x...
[ 42.054203] Object acfe4220: 20 00 02 00 ff ff ff ff 00 00 00 00 00 00 00 00 ...............
[ 42.055370] Object 21024e91: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
[ 42.056541] Object 070e04c3: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
[ 42.057797] Object 948a777a: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
[ 42.059061] Redzone 8bf2c4a5: 00 00 00 00 ....
[ 42.060189] Padding a681b46e: 5a 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZ
Fix by making sure the new buffer is properly resized to contain all the
requested data.
BugLink: https://bugs.launchpad.net/bugs/1813244
Signed-off-by: Andrea Righi <andrea.righi@xxxxxxxxxxxxx>
Acked-by: Pravin B Shelar <pshelar@xxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/openvswitch/flow_netlink.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/net/openvswitch/flow_netlink.c
+++ b/net/openvswitch/flow_netlink.c
@@ -1967,14 +1967,14 @@ static struct nlattr *reserve_sfa_size(s
struct sw_flow_actions *acts;
int new_acts_size;
- int req_size = NLA_ALIGN(attr_len);
+ size_t req_size = NLA_ALIGN(attr_len);
int next_offset = offsetof(struct sw_flow_actions, actions) +
(*sfa)->actions_len;
if (req_size <= (ksize(*sfa) - next_offset))
goto out;
- new_acts_size = ksize(*sfa) * 2;
+ new_acts_size = max(next_offset + req_size, ksize(*sfa) * 2);
if (new_acts_size > MAX_ACTIONS_BUFSIZE) {
if ((MAX_ACTIONS_BUFSIZE - next_offset) < req_size) {
Patches currently in stable-queue which might be from andrea.righi@xxxxxxxxxxxxx are
queue-4.14/openvswitch-fix-flow-actions-reallocation.patch
