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Eric Dumazet 96cc4b6958 macvlan: do not assume mac_header is set in macvlan_broadcast() 
Use of eth_hdr() in tx path is error prone.

Many drivers call skb_reset_mac_header() before using it,
but others do not.

Commit 6d1ccff627 ("net: reset mac header in dev_start_xmit()")
attempted to fix this generically, but commit d346a3fae3
("packet: introduce PACKET_QDISC_BYPASS socket option") brought
back the macvlan bug.

Lets add a new helper, so that tx paths no longer have
to call skb_reset_mac_header() only to get a pointer
to skb->data.

Hopefully we will be able to revert 6d1ccff627
("net: reset mac header in dev_start_xmit()") and save few cycles
in transmit fast path.

BUG: KASAN: use-after-free in __get_unaligned_cpu32 include/linux/unaligned/packed_struct.h:19 [inline]
BUG: KASAN: use-after-free in mc_hash drivers/net/macvlan.c:251 [inline]
BUG: KASAN: use-after-free in macvlan_broadcast+0x547/0x620 drivers/net/macvlan.c:277
Read of size 4 at addr ffff8880a4932401 by task syz-executor947/9579

CPU: 0 PID: 9579 Comm: syz-executor947 Not tainted 5.5.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x197/0x210 lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0xd4/0x30b mm/kasan/report.c:374
 __kasan_report.cold+0x1b/0x41 mm/kasan/report.c:506
 kasan_report+0x12/0x20 mm/kasan/common.c:639
 __asan_report_load_n_noabort+0xf/0x20 mm/kasan/generic_report.c:145
 __get_unaligned_cpu32 include/linux/unaligned/packed_struct.h:19 [inline]
 mc_hash drivers/net/macvlan.c:251 [inline]
 macvlan_broadcast+0x547/0x620 drivers/net/macvlan.c:277
 macvlan_queue_xmit drivers/net/macvlan.c:520 [inline]
 macvlan_start_xmit+0x402/0x77f drivers/net/macvlan.c:559
 __netdev_start_xmit include/linux/netdevice.h:4447 [inline]
 netdev_start_xmit include/linux/netdevice.h:4461 [inline]
 dev_direct_xmit+0x419/0x630 net/core/dev.c:4079
 packet_direct_xmit+0x1a9/0x250 net/packet/af_packet.c:240
 packet_snd net/packet/af_packet.c:2966 [inline]
 packet_sendmsg+0x260d/0x6220 net/packet/af_packet.c:2991
 sock_sendmsg_nosec net/socket.c:639 [inline]
 sock_sendmsg+0xd7/0x130 net/socket.c:659
 __sys_sendto+0x262/0x380 net/socket.c:1985
 __do_sys_sendto net/socket.c:1997 [inline]
 __se_sys_sendto net/socket.c:1993 [inline]
 __x64_sys_sendto+0xe1/0x1a0 net/socket.c:1993
 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x442639
Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 5b 10 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffc13549e08 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000442639
RDX: 000000000000000e RSI: 0000000020000080 RDI: 0000000000000003
RBP: 0000000000000004 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000403bb0 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 9389:
 save_stack+0x23/0x90 mm/kasan/common.c:72
 set_track mm/kasan/common.c:80 [inline]
 __kasan_kmalloc mm/kasan/common.c:513 [inline]
 __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:486
 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:527
 __do_kmalloc mm/slab.c:3656 [inline]
 __kmalloc+0x163/0x770 mm/slab.c:3665
 kmalloc include/linux/slab.h:561 [inline]
 tomoyo_realpath_from_path+0xc5/0x660 security/tomoyo/realpath.c:252
 tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
 tomoyo_path_perm+0x230/0x430 security/tomoyo/file.c:822
 tomoyo_inode_getattr+0x1d/0x30 security/tomoyo/tomoyo.c:129
 security_inode_getattr+0xf2/0x150 security/security.c:1222
 vfs_getattr+0x25/0x70 fs/stat.c:115
 vfs_statx_fd+0x71/0xc0 fs/stat.c:145
 vfs_fstat include/linux/fs.h:3265 [inline]
 __do_sys_newfstat+0x9b/0x120 fs/stat.c:378
 __se_sys_newfstat fs/stat.c:375 [inline]
 __x64_sys_newfstat+0x54/0x80 fs/stat.c:375
 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 9389:
 save_stack+0x23/0x90 mm/kasan/common.c:72
 set_track mm/kasan/common.c:80 [inline]
 kasan_set_free_info mm/kasan/common.c:335 [inline]
 __kasan_slab_free+0x102/0x150 mm/kasan/common.c:474
 kasan_slab_free+0xe/0x10 mm/kasan/common.c:483
 __cache_free mm/slab.c:3426 [inline]
 kfree+0x10a/0x2c0 mm/slab.c:3757
 tomoyo_realpath_from_path+0x1a7/0x660 security/tomoyo/realpath.c:289
 tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
 tomoyo_path_perm+0x230/0x430 security/tomoyo/file.c:822
 tomoyo_inode_getattr+0x1d/0x30 security/tomoyo/tomoyo.c:129
 security_inode_getattr+0xf2/0x150 security/security.c:1222
 vfs_getattr+0x25/0x70 fs/stat.c:115
 vfs_statx_fd+0x71/0xc0 fs/stat.c:145
 vfs_fstat include/linux/fs.h:3265 [inline]
 __do_sys_newfstat+0x9b/0x120 fs/stat.c:378
 __se_sys_newfstat fs/stat.c:375 [inline]
 __x64_sys_newfstat+0x54/0x80 fs/stat.c:375
 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff8880a4932000
 which belongs to the cache kmalloc-4k of size 4096
The buggy address is located 1025 bytes inside of
 4096-byte region [ffff8880a4932000, ffff8880a4933000)
The buggy address belongs to the page:
page:ffffea0002924c80 refcount:1 mapcount:0 mapping:ffff8880aa402000 index:0x0 compound_mapcount: 0
raw: 00fffe0000010200 ffffea0002846208 ffffea00028f3888 ffff8880aa402000
raw: 0000000000000000 ffff8880a4932000 0000000100000001 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880a4932300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880a4932380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880a4932400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff8880a4932480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880a4932500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb

Fixes: b863ceb7dd ("[NET]: Add macvlan driver")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
 		2020-01-08 12:52:33 -08:00
..
appletalk
…
arcnet
…
bonding bonding: fix active-backup transition after link failure 2019-12-14 16:22:34 -08:00
caif Driver core patches for 5.5-rc1 2019-11-27 11:06:20 -08:00
can can: mscan: mscan_rx_poll(): fix rx path lockup when returning from polling to irq mode 2020-01-02 15:34:27 +01:00
dsa net: dsa: mv88e6xxx: Preserve priority when setting CPU port. 2020-01-06 13:35:11 -08:00
ethernet mlxsw: spectrum_qdisc: Ignore grafting of invisible FIFO 2020-01-08 12:45:52 -08:00
fddi
…
fjes Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2019-12-22 09:54:33 -08:00
hamradio 6pack,mkiss: fix possible deadlock 2019-12-13 21:49:29 -08:00
hippi
…
hyperv Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2019-12-22 09:54:33 -08:00
ieee802154 drivers: net: Fix Kconfig indentation, continued 2019-11-21 11:54:09 -08:00
ipvlan Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2019-11-02 13:54:56 -07:00
netdevsim netdevsim: Update dummy reporter's devlink binary interface 2019-11-12 11:25:44 -08:00
phy net: phylink: fix failure to register on x86 systems 2020-01-03 12:37:55 -08:00
plip
…
ppp pppoe: remove redundant BUG_ON() check in pppoe_pernet 2019-12-07 11:52:23 -08:00
slip slip: Fix use-after-free Read in slip_open 2019-11-25 11:02:52 -08:00
team Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2019-11-02 13:54:56 -07:00
usb net: usb: lan78xx: fix possible skb leak 2020-01-07 14:09:28 -08:00
vmxnet3
…
wan net: wan: sdla: Fix cast from pointer to integer of different size 2020-01-06 13:30:03 -08:00
wimax Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2019-11-02 13:54:56 -07:00
wireless Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2019-12-22 09:54:33 -08:00
xen-netback xen-netback: avoid race that can lead to NULL pointer dereference 2019-12-15 11:40:15 -08:00
Kconfig drivers: net: Fix Kconfig indentation, continued 2019-11-21 11:54:09 -08:00
LICENSE.SRC
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Makefile
…
Space.c
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dummy.c net: dummy: use standard dev_lstats_add() and dev_lstats_read() 2019-11-07 20:03:08 -08:00
eql.c
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geneve.c treewide: Use sizeof_field() macro 2019-12-09 10:36:44 -08:00
gtp.c gtp: fix bad unlock balance in gtp_encap_enable_socket 2020-01-08 12:42:49 -08:00
ifb.c
…
loopback.c net: use u64_stats_t in struct pcpu_lstats 2019-11-07 20:03:08 -08:00
macsec.c net: remove unnecessary variables and callback 2019-10-24 14:53:49 -07:00
macvlan.c macvlan: do not assume mac_header is set in macvlan_broadcast() 2020-01-08 12:52:33 -08:00
macvtap.c
…
mdio.c
…
mii.c
…
net_failover.c
…
netconsole.c
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nlmon.c net: nlmon: use standard dev_lstats_add() and dev_lstats_read() 2019-11-07 20:03:08 -08:00
ntb_netdev.c
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rionet.c
…
sb1000.c
…
sungem_phy.c
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tap.c compat_ioctl: move drivers to compat_ptr_ioctl 2019-10-23 17:23:43 +02:00
thunderbolt.c
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tun.c tun: fix data-race in gro_normal_list() 2019-11-15 12:46:49 -08:00
veth.c veth: use standard dev_lstats_add() and dev_lstats_read() 2019-11-07 20:03:08 -08:00
virtio_net.c bpf: Convert bpf_prog refcnt to atomic64_t 2019-11-18 11:41:59 +01:00
vrf.c net: core: add generic lockdep keys 2019-10-24 14:53:48 -07:00
vsockmon.c vsockmon: use standard dev_lstats_add() and dev_lstats_read() 2019-11-07 20:03:08 -08:00
vxlan.c vxlan: fix tos value before xmit 2020-01-02 16:35:48 -08:00
xen-netfront.c
…