commit 83f98831144e00b8143cba97df5f6ef6075c899e
Author: Arkadiusz Miśkiewicz <ar...@maven.pl>
Date: Tue Dec 6 08:39:03 2016 +0100
- rel2; add CVE-2016-8655 fix (local root if having access to AF_PACKET)
kernel-small_fixes.patch | 92 ++++++++++++++++++++++++++++++++++++++++++++++++
kernel.spec | 2 +-
2 files changed, 93 insertions(+), 1 deletion(-)
---
diff --git a/kernel.spec b/kernel.spec
index 555bafb..a96e59b 100644
--- a/kernel.spec
+++ b/kernel.spec
@@ -70,7 +70,7 @@
%define have_pcmcia 0
%endif
-%define rel 1
+%define rel 2
%define basever 4.4
%define postver .36
diff --git a/kernel-small_fixes.patch b/kernel-small_fixes.patch
index 9ce205c..429f51f 100644
--- a/kernel-small_fixes.patch
+++ b/kernel-small_fixes.patch
@@ -38,3 +38,95 @@
# use the deterministic mode of AR if available
KBUILD_ARFLAGS := $(call ar-option,D)
+From 84ac7260236a49c79eede91617700174c2c19b0c Mon Sep 17 00:00:00 2001
+From: Philip Pettersson <philip.petters...@gmail.com>
+Date: Wed, 30 Nov 2016 14:55:36 -0800
+Subject: packet: fix race condition in packet_set_ring
+
+When packet_set_ring creates a ring buffer it will initialize a
+struct timer_list if the packet version is TPACKET_V3. This value
+can then be raced by a different thread calling setsockopt to
+set the version to TPACKET_V1 before packet_set_ring has finished.
+
+This leads to a use-after-free on a function pointer in the
+struct timer_list when the socket is closed as the previously
+initialized timer will not be deleted.
+
+The bug is fixed by taking lock_sock(sk) in packet_setsockopt when
+changing the packet version while also taking the lock at the start
+of packet_set_ring.
+
+Fixes: f6fb8f100b80 ("af-packet: TPACKET_V3 flexible buffer implementation.")
+Signed-off-by: Philip Pettersson <philip.petters...@gmail.com>
+Signed-off-by: Eric Dumazet <eduma...@google.com>
+Signed-off-by: David S. Miller <da...@davemloft.net>
+---
+ net/packet/af_packet.c | 18 ++++++++++++------
+ 1 file changed, 12 insertions(+), 6 deletions(-)
+
+diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
+index d2238b2..dd23323 100644
+--- a/net/packet/af_packet.c
++++ b/net/packet/af_packet.c
+@@ -3648,19 +3648,25 @@ packet_setsockopt(struct socket *sock, int level, int
optname, char __user *optv
+
+ if (optlen != sizeof(val))
+ return -EINVAL;
+- if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
+- return -EBUSY;
+ if (copy_from_user(&val, optval, sizeof(val)))
+ return -EFAULT;
+ switch (val) {
+ case TPACKET_V1:
+ case TPACKET_V2:
+ case TPACKET_V3:
+- po->tp_version = val;
+- return 0;
++ break;
+ default:
+ return -EINVAL;
+ }
++ lock_sock(sk);
++ if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) {
++ ret = -EBUSY;
++ } else {
++ po->tp_version = val;
++ ret = 0;
++ }
++ release_sock(sk);
++ return ret;
+ }
+ case PACKET_RESERVE:
+ {
+@@ -4164,6 +4170,7 @@ static int packet_set_ring(struct sock *sk, union
tpacket_req_u *req_u,
+ /* Added to avoid minimal code churn */
+ struct tpacket_req *req = &req_u->req;
+
++ lock_sock(sk);
+ /* Opening a Tx-ring is NOT supported in TPACKET_V3 */
+ if (!closing && tx_ring && (po->tp_version > TPACKET_V2)) {
+ net_warn_ratelimited("Tx-ring is not supported.\n");
+@@ -4245,7 +4252,6 @@ static int packet_set_ring(struct sock *sk, union
tpacket_req_u *req_u,
+ goto out;
+ }
+
+- lock_sock(sk);
+
+ /* Detach socket from network */
+ spin_lock(&po->bind_lock);
+@@ -4294,11 +4300,11 @@ static int packet_set_ring(struct sock *sk, union
tpacket_req_u *req_u,
+ if (!tx_ring)
+ prb_shutdown_retire_blk_timer(po, rb_queue);
+ }
+- release_sock(sk);
+
+ if (pg_vec)
+ free_pg_vec(pg_vec, order, req->tp_block_nr);
+ out:
++ release_sock(sk);
+ return err;
+ }
+
+--
+cgit v0.12
+
================================================================
---- gitweb:
http://git.pld-linux.org/gitweb.cgi/packages/kernel.git/commitdiff/83f98831144e00b8143cba97df5f6ef6075c899e
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