diff options
| author | William Tu <u9012063@gmail.com> | 2018-01-23 17:01:29 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-05-31 06:47:14 -0700 |
| commit | 1d629bf9b5767cdbe902f32b058ae8c99df72516 (patch) | |
| tree | e60f0e8ad86c9663efc4bbaab16db76e81667a03 /net/ipv4/ip_gre.c | |
| parent | 1fa1c6b63f1e6585ad98e5478e73f5f68f9c823e (diff) | |
net: erspan: fix use-after-free
commit b423d13c08a656c719fa56324a8f4279c835d90c upstream.
When building the erspan header for either v1 or v2, the eth_hdr()
does not point to the right inner packet's eth_hdr,
causing kasan report use-after-free and slab-out-of-bouds read.
The patch fixes the following syzkaller issues:
[1] BUG: KASAN: slab-out-of-bounds in erspan_xmit+0x22d4/0x2430 net/ipv4/ip_gre.c:735
[2] BUG: KASAN: slab-out-of-bounds in erspan_build_header+0x3bf/0x3d0 net/ipv4/ip_gre.c:698
[3] BUG: KASAN: use-after-free in erspan_xmit+0x22d4/0x2430 net/ipv4/ip_gre.c:735
[4] BUG: KASAN: use-after-free in erspan_build_header+0x3bf/0x3d0 net/ipv4/ip_gre.c:698
[2] CPU: 0 PID: 3654 Comm: syzkaller377964 Not tainted 4.15.0-rc9+ #185
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x194/0x257 lib/dump_stack.c:53
print_address_description+0x73/0x250 mm/kasan/report.c:252
kasan_report_error mm/kasan/report.c:351 [inline]
kasan_report+0x25b/0x340 mm/kasan/report.c:409
__asan_report_load_n_noabort+0xf/0x20 mm/kasan/report.c:440
erspan_build_header+0x3bf/0x3d0 net/ipv4/ip_gre.c:698
erspan_xmit+0x3b8/0x13b0 net/ipv4/ip_gre.c:740
__netdev_start_xmit include/linux/netdevice.h:4042 [inline]
netdev_start_xmit include/linux/netdevice.h:4051 [inline]
packet_direct_xmit+0x315/0x6b0 net/packet/af_packet.c:266
packet_snd net/packet/af_packet.c:2943 [inline]
packet_sendmsg+0x3aed/0x60b0 net/packet/af_packet.c:2968
sock_sendmsg_nosec net/socket.c:638 [inline]
sock_sendmsg+0xca/0x110 net/socket.c:648
SYSC_sendto+0x361/0x5c0 net/socket.c:1729
SyS_sendto+0x40/0x50 net/socket.c:1697
do_syscall_32_irqs_on arch/x86/entry/common.c:327 [inline]
do_fast_syscall_32+0x3ee/0xf9d arch/x86/entry/common.c:389
entry_SYSENTER_compat+0x54/0x63 arch/x86/entry/entry_64_compat.S:129
RIP: 0023:0xf7fcfc79
RSP: 002b:00000000ffc6976c EFLAGS: 00000286 ORIG_RAX: 0000000000000171
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000020011000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020008000
RBP: 000000000000001c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Fixes: f551c91de262 ("net: erspan: introduce erspan v2 for ip_gre")
Fixes: 84e54fe0a5ea ("gre: introduce native tunnel support for ERSPAN")
Reported-by: syzbot+9723f2d288e49b492cf0@syzkaller.appspotmail.com
Reported-by: syzbot+f0ddeb2b032a8e1d9098@syzkaller.appspotmail.com
Reported-by: syzbot+f14b3703cd8d7670203f@syzkaller.appspotmail.com
Reported-by: syzbot+eefa384efad8d7997f20@syzkaller.appspotmail.com
Signed-off-by: William Tu <u9012063@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Christoph Paasch <cpaasch@apple.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net/ipv4/ip_gre.c')
| -rw-r--r-- | net/ipv4/ip_gre.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c index dd3bcf22fe8b..0fc499db6da2 100644 --- a/net/ipv4/ip_gre.c +++ b/net/ipv4/ip_gre.c @@ -689,7 +689,7 @@ static void erspan_build_header(struct sk_buff *skb, __be32 id, u32 index, bool truncate) { struct iphdr *iphdr = ip_hdr(skb); - struct ethhdr *eth = eth_hdr(skb); + struct ethhdr *eth = (struct ethhdr *)skb->data; enum erspan_encap_type enc_type; struct erspanhdr *ershdr; struct qtag_prefix { |