Update to 4.8.13-1

.SRCINFO

@@ -1,7 +1,7 @@
 # Generated by mksrcinfo v8
-# Wed Nov 23 16:50:45 UTC 2016
+# Sat Dec 10 05:34:33 UTC 2016
 pkgbase = linux-vfio
-	pkgver = 4.8.10
+	pkgver = 4.8.13
 	pkgrel = 1
 	url = http://www.kernel.org/
 	arch = i686
@@ -16,8 +16,8 @@ pkgbase = linux-vfio
 	options = !strip
 	source = https://www.kernel.org/pub/linux/kernel/v4.x/linux-4.8.tar.xz
 	source = https://www.kernel.org/pub/linux/kernel/v4.x/linux-4.8.tar.sign
-	source = https://www.kernel.org/pub/linux/kernel/v4.x/patch-4.8.10.xz
+	source = https://www.kernel.org/pub/linux/kernel/v4.x/patch-4.8.13.xz
-	source = https://www.kernel.org/pub/linux/kernel/v4.x/patch-4.8.10.sign
+	source = https://www.kernel.org/pub/linux/kernel/v4.x/patch-4.8.13.sign
 	source = config
 	source = config.x86_64
 	source = 99-linux.hook
@@ -25,9 +25,11 @@ pkgbase = linux-vfio
 	source = change-default-console-loglevel.patch
 	source = 0001-pci-Enable-overrides-for-missing-ACS-capabilities-4..patch
 	source = 0001-i915-Add-module-option-to-support-VGA-arbiter-on-HD-.patch
+	source = fix_race_condition_in_packet_set_ring.diff
+	source = net_handle_no_dst_on_skb_in_icmp6_send.patch
 	sha256sums = 3e9150065f193d3d94bcf46a1fe9f033c7ef7122ab71d75a7fb5a2f0c9a7e11a
 	sha256sums = SKIP
-	sha256sums = d0ea1671c488957d7b1ef46a5107c47c16b37f2985ca7ee4c900ba0f89d40d3c
+	sha256sums = f0e2f7f738e1a639956e01ba7ef8d3df40ecb5c7586eb366bcd4af70049a7a3c
 	sha256sums = SKIP
 	sha256sums = 01dd9e64e4d5c2188fcbb5a48375c987b16f28f383fb42559a34e1a2c5a8ef2a
 	sha256sums = 4111ac3a567c2fccd56368c36dad29753c0df4eae721b4a475bae20dae76855a
@@ -36,6 +38,8 @@ pkgbase = linux-vfio
 	sha256sums = 1256b241cd477b265a3c2d64bdc19ffe3c9bbcee82ea3994c590c2c76e767d99
 	sha256sums = d36c589e3866535a9ac92911be64795967a05a6d300cc8b70abb79ea24b7b393
 	sha256sums = 97c6eaff4dfd2059835351afa9466b43569f3eb45f6c57094f57a3f3fad7ec85
+	sha256sums = 68067f9be72c0b7d0fe78f00514ad12cab597bfd63083ff4d9d2745c8bd3b616
+	sha256sums = 144bb67184d7e1fda1a254b5364f72465e3070179713071c72c18618e7b6218a
 
 pkgname = linux-vfio
 	pkgdesc = The Linux kernel and modules with patches to enable GPU passthrough with KVM

PKGBUILD

@@ -3,7 +3,7 @@
 
 pkgbase=linux-vfio
 _srcname=linux-4.8
-pkgver=4.8.10
+pkgver=4.8.13
 pkgrel=1
 arch=('i686' 'x86_64')
 url="http://www.kernel.org/"
@@ -22,10 +22,13 @@ source=("https://www.kernel.org/pub/linux/kernel/v4.x/${_srcname}.tar.xz"
         'linux.preset'
         'change-default-console-loglevel.patch'
         '0001-pci-Enable-overrides-for-missing-ACS-capabilities-4..patch'
-        '0001-i915-Add-module-option-to-support-VGA-arbiter-on-HD-.patch')
+        '0001-i915-Add-module-option-to-support-VGA-arbiter-on-HD-.patch'
+        'fix_race_condition_in_packet_set_ring.diff'
+        'net_handle_no_dst_on_skb_in_icmp6_send.patch'
+        )
 sha256sums=('3e9150065f193d3d94bcf46a1fe9f033c7ef7122ab71d75a7fb5a2f0c9a7e11a'
             'SKIP'
-            'd0ea1671c488957d7b1ef46a5107c47c16b37f2985ca7ee4c900ba0f89d40d3c'
+            'f0e2f7f738e1a639956e01ba7ef8d3df40ecb5c7586eb366bcd4af70049a7a3c'
             'SKIP'
             '01dd9e64e4d5c2188fcbb5a48375c987b16f28f383fb42559a34e1a2c5a8ef2a'
             '4111ac3a567c2fccd56368c36dad29753c0df4eae721b4a475bae20dae76855a'
@@ -33,7 +36,9 @@ sha256sums=('3e9150065f193d3d94bcf46a1fe9f033c7ef7122ab71d75a7fb5a2f0c9a7e11a'
             '99d0102c8065793096b8ea2ccc01c41fa3dcb96855f9f6f2c583b2372208c6f9'
             '1256b241cd477b265a3c2d64bdc19ffe3c9bbcee82ea3994c590c2c76e767d99'
             'd36c589e3866535a9ac92911be64795967a05a6d300cc8b70abb79ea24b7b393'
-            '97c6eaff4dfd2059835351afa9466b43569f3eb45f6c57094f57a3f3fad7ec85')
+            '97c6eaff4dfd2059835351afa9466b43569f3eb45f6c57094f57a3f3fad7ec85'
+            '68067f9be72c0b7d0fe78f00514ad12cab597bfd63083ff4d9d2745c8bd3b616'
+            '144bb67184d7e1fda1a254b5364f72465e3070179713071c72c18618e7b6218a')
 validpgpkeys=(
               'ABAF11C65A2970B130ABE3C479BE3E4300411886' # Linus Torvalds
               '647F28654894E3BD457199BE38DBBDC86092693E' # Greg Kroah-Hartman
@@ -47,6 +52,13 @@ prepare() {
   # add upstream patch
   patch -p1 -i "${srcdir}/patch-${pkgver}"
 
+  # fix a race condition that allows to gain root
+  # https://marc.info/?l=linux-netdev&m=148054660230570&w=2
+  patch -p1 -i "${srcdir}/fix_race_condition_in_packet_set_ring.diff"
+
+  # https://bugzilla.kernel.org/show_bug.cgi?id=189851
+  patch -p1 -i "${srcdir}/net_handle_no_dst_on_skb_in_icmp6_send.patch"
+
   # add latest fixes from stable queue, if needed
   # http://git.kernel.org/?p=linux/kernel/git/stable/stable-queue.git
 

fix_race_condition_in_packet_set_ring.diff

@@ -0,0 +1,85 @@
+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;
+ }
+

net_handle_no_dst_on_skb_in_icmp6_send.patch

@@ -0,0 +1,69 @@
+From 79dc7e3f1cd323be4c81aa1a94faa1b3ed987fb2 Mon Sep 17 00:00:00 2001
+From: David Ahern <dsa@cumulusnetworks.com>
+Date: Sun, 27 Nov 2016 18:52:53 -0800
+Subject: [PATCH] net: handle no dst on skb in icmp6_send
+
+Andrey reported the following while fuzzing the kernel with syzkaller:
+
+kasan: CONFIG_KASAN_INLINE enabled
+kasan: GPF could be caused by NULL-ptr deref or user memory access
+general protection fault: 0000 [#1] SMP KASAN
+Modules linked in:
+CPU: 0 PID: 3859 Comm: a.out Not tainted 4.9.0-rc6+ #429
+Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
+task: ffff8800666d4200 task.stack: ffff880067348000
+RIP: 0010:[<ffffffff833617ec>]  [<ffffffff833617ec>]
+icmp6_send+0x5fc/0x1e30 net/ipv6/icmp.c:451
+RSP: 0018:ffff88006734f2c0  EFLAGS: 00010206
+RAX: ffff8800666d4200 RBX: 0000000000000000 RCX: 0000000000000000
+RDX: 0000000000000000 RSI: dffffc0000000000 RDI: 0000000000000018
+RBP: ffff88006734f630 R08: ffff880064138418 R09: 0000000000000003
+R10: dffffc0000000000 R11: 0000000000000005 R12: 0000000000000000
+R13: ffffffff84e7e200 R14: ffff880064138484 R15: ffff8800641383c0
+FS:  00007fb3887a07c0(0000) GS:ffff88006cc00000(0000) knlGS:0000000000000000
+CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
+CR2: 0000000020000000 CR3: 000000006b040000 CR4: 00000000000006f0
+Stack:
+ ffff8800666d4200 ffff8800666d49f8 ffff8800666d4200 ffffffff84c02460
+ ffff8800666d4a1a 1ffff1000ccdaa2f ffff88006734f498 0000000000000046
+ ffff88006734f440 ffffffff832f4269 ffff880064ba7456 0000000000000000
+Call Trace:
+ [<ffffffff83364ddc>] icmpv6_param_prob+0x2c/0x40 net/ipv6/icmp.c:557
+ [<     inline     >] ip6_tlvopt_unknown net/ipv6/exthdrs.c:88
+ [<ffffffff83394405>] ip6_parse_tlv+0x555/0x670 net/ipv6/exthdrs.c:157
+ [<ffffffff8339a759>] ipv6_parse_hopopts+0x199/0x460 net/ipv6/exthdrs.c:663
+ [<ffffffff832ee773>] ipv6_rcv+0xfa3/0x1dc0 net/ipv6/ip6_input.c:191
+ ...
+
+icmp6_send / icmpv6_send is invoked for both rx and tx paths. In both
+cases the dst->dev should be preferred for determining the L3 domain
+if the dst has been set on the skb. Fallback to the skb->dev if it has
+not. This covers the case reported here where icmp6_send is invoked on
+Rx before the route lookup.
+
+Fixes: 5d41ce29e ("net: icmp6_send should use dst dev to determine L3 domain")
+Reported-by: Andrey Konovalov <andreyknvl@google.com>
+Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
+Signed-off-by: David S. Miller <davem@davemloft.net>
+---
+ net/ipv6/icmp.c | 6 ++++--
+ 1 file changed, 4 insertions(+), 2 deletions(-)
+
+diff --git a/net/ipv6/icmp.c b/net/ipv6/icmp.c
+index 7370ad2..2772004 100644
+--- a/net/ipv6/icmp.c
++++ b/net/ipv6/icmp.c
+@@ -447,8 +447,10 @@ static void icmp6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info,
+ 
+ 	if (__ipv6_addr_needs_scope_id(addr_type))
+ 		iif = skb->dev->ifindex;
+-	else
+-		iif = l3mdev_master_ifindex(skb_dst(skb)->dev);
++	else {
++		dst = skb_dst(skb);
++		iif = l3mdev_master_ifindex(dst ? dst->dev : skb->dev);
++	}
+ 
+ 	/*
+ 	 *	Must not send error if the source does not uniquely
+