add patch fixing icmp6_send nullpointer kernel panic
This commit is contained in:
Bartłomiej Piotrowski
parent
cef8e147af
commit
f64181f08d
9
PKGBUILD
9
PKGBUILD
@ -6,7 +6,7 @@ pkgbase=linux # Build stock -ARCH kernel
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#pkgbase=linux-custom # Build kernel with a different name
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_srcname=linux-4.8
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pkgver=4.8.12
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pkgrel=2
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pkgrel=3
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arch=('i686' 'x86_64')
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url="https://www.kernel.org/"
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license=('GPL2')
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@ -24,6 +24,7 @@ source=("https://www.kernel.org/pub/linux/kernel/v4.x/${_srcname}.tar.xz"
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'linux.preset'
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'change-default-console-loglevel.patch'
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fix_race_condition_in_packet_set_ring.diff
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net_handle_no_dst_on_skb_in_icmp6_send.patch
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)
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sha256sums=('3e9150065f193d3d94bcf46a1fe9f033c7ef7122ab71d75a7fb5a2f0c9a7e11a'
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@ -35,7 +36,8 @@ sha256sums=('3e9150065f193d3d94bcf46a1fe9f033c7ef7122ab71d75a7fb5a2f0c9a7e11a'
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'834bd254b56ab71d73f59b3221f056c72f559553c04718e350ab2a3e2991afe0'
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'ad6344badc91ad0630caacde83f7f9b97276f80d26a20619a87952be65492c65'
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'1256b241cd477b265a3c2d64bdc19ffe3c9bbcee82ea3994c590c2c76e767d99'
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'ad1ee95f906f88d31fcdb9273cd08e02e8eda177449f0c98dc1bff8cbf1483c2')
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'ad1ee95f906f88d31fcdb9273cd08e02e8eda177449f0c98dc1bff8cbf1483c2'
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'b595a1588bafb3d732841cd1b73633970706914f57f2d215c9f1494212d13989')
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validpgpkeys=(
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'ABAF11C65A2970B130ABE3C479BE3E4300411886' # Linus Torvalds
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'647F28654894E3BD457199BE38DBBDC86092693E' # Greg Kroah-Hartman
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@ -53,6 +55,9 @@ prepare() {
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# https://marc.info/?l=linux-netdev&m=148054660230570&w=2
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patch -p1 -i "${srcdir}/fix_race_condition_in_packet_set_ring.diff"
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# https://bugzilla.kernel.org/show_bug.cgi?id=189851
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patch -p1 -i "${srcdir}/net_handle_no_dst_on_skb_in_icmp6_send.patch"
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# add latest fixes from stable queue, if needed
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# http://git.kernel.org/?p=linux/kernel/git/stable/stable-queue.git
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68
net_handle_no_dst_on_skb_in_icmp6_send.patch
Normal file
68
net_handle_no_dst_on_skb_in_icmp6_send.patch
Normal file
@ -0,0 +1,68 @@
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From 79dc7e3f1cd323be4c81aa1a94faa1b3ed987fb2 Mon Sep 17 00:00:00 2001
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From: David Ahern <dsa@cumulusnetworks.com>
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Date: Sun, 27 Nov 2016 18:52:53 -0800
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Subject: [PATCH] net: handle no dst on skb in icmp6_send
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Andrey reported the following while fuzzing the kernel with syzkaller:
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kasan: CONFIG_KASAN_INLINE enabled
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kasan: GPF could be caused by NULL-ptr deref or user memory access
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general protection fault: 0000 [#1] SMP KASAN
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Modules linked in:
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CPU: 0 PID: 3859 Comm: a.out Not tainted 4.9.0-rc6+ #429
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Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
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task: ffff8800666d4200 task.stack: ffff880067348000
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RIP: 0010:[<ffffffff833617ec>] [<ffffffff833617ec>]
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icmp6_send+0x5fc/0x1e30 net/ipv6/icmp.c:451
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RSP: 0018:ffff88006734f2c0 EFLAGS: 00010206
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RAX: ffff8800666d4200 RBX: 0000000000000000 RCX: 0000000000000000
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RDX: 0000000000000000 RSI: dffffc0000000000 RDI: 0000000000000018
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RBP: ffff88006734f630 R08: ffff880064138418 R09: 0000000000000003
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R10: dffffc0000000000 R11: 0000000000000005 R12: 0000000000000000
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R13: ffffffff84e7e200 R14: ffff880064138484 R15: ffff8800641383c0
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FS: 00007fb3887a07c0(0000) GS:ffff88006cc00000(0000) knlGS:0000000000000000
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CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
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CR2: 0000000020000000 CR3: 000000006b040000 CR4: 00000000000006f0
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Stack:
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ffff8800666d4200 ffff8800666d49f8 ffff8800666d4200 ffffffff84c02460
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ffff8800666d4a1a 1ffff1000ccdaa2f ffff88006734f498 0000000000000046
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ffff88006734f440 ffffffff832f4269 ffff880064ba7456 0000000000000000
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Call Trace:
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[<ffffffff83364ddc>] icmpv6_param_prob+0x2c/0x40 net/ipv6/icmp.c:557
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[< inline >] ip6_tlvopt_unknown net/ipv6/exthdrs.c:88
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[<ffffffff83394405>] ip6_parse_tlv+0x555/0x670 net/ipv6/exthdrs.c:157
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[<ffffffff8339a759>] ipv6_parse_hopopts+0x199/0x460 net/ipv6/exthdrs.c:663
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[<ffffffff832ee773>] ipv6_rcv+0xfa3/0x1dc0 net/ipv6/ip6_input.c:191
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...
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icmp6_send / icmpv6_send is invoked for both rx and tx paths. In both
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cases the dst->dev should be preferred for determining the L3 domain
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if the dst has been set on the skb. Fallback to the skb->dev if it has
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not. This covers the case reported here where icmp6_send is invoked on
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Rx before the route lookup.
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Fixes: 5d41ce29e ("net: icmp6_send should use dst dev to determine L3 domain")
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Reported-by: Andrey Konovalov <andreyknvl@google.com>
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Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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---
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net/ipv6/icmp.c | 6 ++++--
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1 file changed, 4 insertions(+), 2 deletions(-)
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diff --git a/net/ipv6/icmp.c b/net/ipv6/icmp.c
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index 7370ad2..2772004 100644
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--- a/net/ipv6/icmp.c
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+++ b/net/ipv6/icmp.c
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@@ -447,8 +447,10 @@ static void icmp6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info,
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if (__ipv6_addr_needs_scope_id(addr_type))
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iif = skb->dev->ifindex;
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- else
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- iif = l3mdev_master_ifindex(skb_dst(skb)->dev);
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+ else {
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+ dst = skb_dst(skb);
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+ iif = l3mdev_master_ifindex(dst ? dst->dev : skb->dev);
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+ }
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/*
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* Must not send error if the source does not uniquely
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