bump to 4.4.32_rt43-2, add fix for CVE-2016-8655

3 files changed, 94 insertions, 3 deletions

diff --git a/.SRCINFO b/.SRCINFO
index 20bc8b24f3b2..ec6a98c7606a 100644
--- a/.SRCINFO
+++ b/.SRCINFO
@@ -1,8 +1,8 @@
 # Generated by makepkg 5.0.1
-# Sat Nov 19 19:09:00 UTC 2016
+# Thu Dec  8 19:00:58 UTC 2016
 pkgbase = linux-rt-lts
 	pkgver = 4.4.32_rt43
-	pkgrel = 1
+	pkgrel = 2
 	url = http://www.kernel.org/
 	arch = i686
 	arch = x86_64
@@ -22,6 +22,7 @@ pkgbase = linux-rt-lts
 	source = config
 	source = config.x86_64
 	source = linux-rt-lts.preset
+	source = fix_race_condition_in_packet_set_ring.diff
 	source = change-default-console-loglevel.patch
 	source = fix-race-in-PRT-wait-for-completion-simple-wait-code_Nvidia-RT-160319.patch
 	validpgpkeys = ABAF11C65A2970B130ABE3C479BE3E4300411886
@@ -38,6 +39,7 @@ pkgbase = linux-rt-lts
 	sha256sums = 1f609d41a9d5cd0eb88060bd0ad6726f76e9dbf0deee44d6fe3dc57f0fbb3191
 	sha256sums = b28728fa4816c4f32b4b390b22c8b9d4ea52a35b150ed7041d325ab72cd8c6a3
 	sha256sums = a8886f2c9896f81f59cf0413b3e380cda2fbdc667eb9ce8dfcb0fceb6d92279f
+	sha256sums = ad1ee95f906f88d31fcdb9273cd08e02e8eda177449f0c98dc1bff8cbf1483c2
 	sha256sums = 1256b241cd477b265a3c2d64bdc19ffe3c9bbcee82ea3994c590c2c76e767d99
 	sha256sums = 85f7612edfa129210343d6a4fe4ba2a4ac3542d98b7e28c8896738e7e6541c06
 
diff --git a/PKGBUILD b/PKGBUILD
index 1b4eaddfacac..078cfb503e8a 100644
--- a/PKGBUILD
+++ b/PKGBUILD
@@ -10,7 +10,7 @@ _srcname=linux-4.4
 _pkgver=4.4.32
 _rtpatchver=rt43
 pkgver=${_pkgver}_${_rtpatchver}
-pkgrel=1
+pkgrel=2
 arch=('i686' 'x86_64')
 url="http://www.kernel.org/"
 license=('GPL2')
@@ -26,6 +26,7 @@ source=("https://www.kernel.org/pub/linux/kernel/v4.x/${_srcname}.tar.xz"
         'config' 'config.x86_64'
         # standard config files for mkinitcpio ramdisk
         "${pkgbase}.preset"
+        'fix_race_condition_in_packet_set_ring.diff'
         'change-default-console-loglevel.patch'
         'fix-race-in-PRT-wait-for-completion-simple-wait-code_Nvidia-RT-160319.patch')
 
@@ -38,6 +39,7 @@ sha256sums=('401d7c8fef594999a460d10c72c5a94e9c2e1022f16795ec51746b0d165418b2'
             '1f609d41a9d5cd0eb88060bd0ad6726f76e9dbf0deee44d6fe3dc57f0fbb3191'
             'b28728fa4816c4f32b4b390b22c8b9d4ea52a35b150ed7041d325ab72cd8c6a3'
             'a8886f2c9896f81f59cf0413b3e380cda2fbdc667eb9ce8dfcb0fceb6d92279f'
+            'ad1ee95f906f88d31fcdb9273cd08e02e8eda177449f0c98dc1bff8cbf1483c2'
             '1256b241cd477b265a3c2d64bdc19ffe3c9bbcee82ea3994c590c2c76e767d99'
             '85f7612edfa129210343d6a4fe4ba2a4ac3542d98b7e28c8896738e7e6541c06')
 
@@ -63,6 +65,9 @@ prepare() {
   # add latest fixes from stable queue, if needed
   # http://git.kernel.org/?p=linux/kernel/git/stable/stable-queue.git
 
+  msg "fix_race_condition_in_packet_set_ring.diff"
+  patch -p1 -i "${srcdir}/fix_race_condition_in_packet_set_ring.diff"
+
   # set DEFAULT_CONSOLE_LOGLEVEL to 4 (same value as the 'quiet' kernel param)
   # remove this when a Kconfig knob is made available by upstream
   # (relevant patch sent upstream: https://lkml.org/lkml/2011/7/26/227)
diff --git a/fix_race_condition_in_packet_set_ring.diff b/fix_race_condition_in_packet_set_ring.diff
new file mode 100644
index 000000000000..12048f611d1a
--- /dev/null
+++ b/fix_race_condition_in_packet_set_ring.diff
@@ -0,0 +1,84 @@
+From: Philip Pettersson <philip.pettersson@gmail.com>
+
+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.pettersson@gmail.com>
+Signed-off-by: Eric Dumazet <edumazet@google.com>
+---
+ 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 d2238b204691b8e4f2e3acb9bc167b553ba32d50..dd2332390c45bbff7c3fc5d259453f2e1ca352bf 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;
+ }