William Tu b423d13c08 net: erspan: fix use-after-free ... 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: f551c91de2 ("net: erspan: introduce erspan v2 for ip_gre") Fixes: 84e54fe0a5 ("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>		2018-01-24 16:53:17 -05:00
..
acpi	Merge branch 'acpi-ec' into acpi	2017-11-30 13:37:29 +01:00
asm-generic	error-injection: Add injectable error types	2018-01-12 17:33:38 -08:00
clocksource
crypto	Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6	2018-01-05 12:10:06 -08:00
drm	drm: rework delayed connector cleanup in connector_iter	2017-12-13 22:59:00 +01:00
dt-bindings	fixes/cleanups for rc1, non-desktop flags for VR	2017-11-23 21:04:56 -10:00
keys
kvm	KVM: arm/arm64: timer: Don't set irq as forwarded if no usable GIC	2017-12-18 10:53:23 +01:00
linux	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2018-01-23 13:51:56 -05:00
math-emu
media	media updates for v4.15-rc1	2017-11-15 20:30:12 -08:00
memory
misc
net	net: erspan: fix use-after-free	2018-01-24 16:53:17 -05:00
pcmcia
ras
rdma
scsi	scsi: libsas: align sata_device's rps_resp on a cacheline	2017-11-21 23:06:32 -05:00
soc	We have two changes to the core framework this time around. The first being a	2017-11-17 20:04:24 -08:00
sound	ALSA: hda - Fix yet remaining issue with vmaster 0dB initialization	2017-11-22 12:34:56 +01:00
target	Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending	2017-11-24 19:19:20 -10:00
trace	net: tracepoint: exposing sk_faimily in tracepoint inet_sock_set_state	2018-01-08 14:32:45 -05:00
uapi	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2018-01-23 13:51:56 -05:00
video	fbdev changes for v4.15:	2017-11-20 21:50:24 -10:00
xen	xen: fixes for 4.15-rc5	2017-12-22 12:30:10 -08:00