KASAN: use-after-free Read in ip6_hold

Title	Replies (including bot)	Last reply
[PATCH 3.16 000/328] 3.16.62-rc1 review	338 (338)	2018/12/16 22:01
[PATCH 3.18 00/56] 3.18.120-stable review	58 (58)	2018/08/27 19:30
[PATCH 4.4 00/22] 4.4.151-stable review	26 (26)	2018/08/21 22:01
[PATCH 4.9 00/25] 4.9.123-stable review	31 (31)	2018/08/21 22:00
[PATCH 4.18 00/35] 4.18.4-stable review	41 (41)	2018/08/21 20:03
[PATCH 4.14 00/29] 4.14.66-stable review	33 (33)	2018/08/21 19:49
[PATCH 4.17 00/42] 4.17.18-stable review	46 (46)	2018/08/21 19:44
[PATCH net v2] l2tp: use sk_dst_check() to avoid race on sk->sk_dst_cache	2 (2)	2018/08/13 15:49
[PATCH net] l2tp: use sk_dst_check() to avoid race on sk->sk_dst_cache	3 (3)	2018/08/10 16:54

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KASAN: use-after-free Read in ip6_hold_safe (2) net				14	1891d	1936d	0/26	closed as invalid on 2019/03/18 18:21
upstream	KASAN: use-after-free Read in ip6_hold_safe (3) net				17	1790d	1837d	0/26	closed as invalid on 2019/10/04 04:25

upstream

KASAN: use-after-free Read in ip6_hold_safe (2) net

1891d

1936d

0/26

closed as invalid on 2019/03/18 18:21

upstream

KASAN: use-after-free Read in ip6_hold_safe (3) net

1790d

1837d

0/26

closed as invalid on 2019/10/04 04:25

================================================================== BUG: KASAN: use-after-free in atomic_read include/asm-generic/atomic-instrumented.h:21 [inline] BUG: KASAN: use-after-free in atomic_fetch_add_unless include/linux/atomic.h:575 [inline] BUG: KASAN: use-after-free in atomic_add_unless include/linux/atomic.h:597 [inline] BUG: KASAN: use-after-free in dst_hold_safe include/net/dst.h:308 [inline] BUG: KASAN: use-after-free in ip6_hold_safe+0xe6/0x670 net/ipv6/route.c:1029 Read of size 4 at addr ffff8801aea9a880 by task syz-executor129/4829 CPU: 0 PID: 4829 Comm: syz-executor129 Not tainted 4.18.0-rc7-next-20180802+ #30 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+0x1c9/0x2b4 lib/dump_stack.c:113 print_address_description+0x6c/0x20b mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.7+0x242/0x30d mm/kasan/report.c:412 check_memory_region_inline mm/kasan/kasan.c:260 [inline] check_memory_region+0x13e/0x1b0 mm/kasan/kasan.c:267 kasan_check_read+0x11/0x20 mm/kasan/kasan.c:272 atomic_read include/asm-generic/atomic-instrumented.h:21 [inline] atomic_fetch_add_unless include/linux/atomic.h:575 [inline] atomic_add_unless include/linux/atomic.h:597 [inline] dst_hold_safe include/net/dst.h:308 [inline] ip6_hold_safe+0xe6/0x670 net/ipv6/route.c:1029 rt6_get_pcpu_route net/ipv6/route.c:1249 [inline] ip6_pol_route+0x354/0xd20 net/ipv6/route.c:1922 ip6_pol_route_output+0x54/0x70 net/ipv6/route.c:2098 fib6_rule_lookup+0x283/0x890 net/ipv6/fib6_rules.c:122 ip6_route_output_flags+0x2c5/0x350 net/ipv6/route.c:2126 ip6_dst_lookup_tail+0x1278/0x1da0 net/ipv6/ip6_output.c:978 ip6_dst_lookup_flow+0xc8/0x270 net/ipv6/ip6_output.c:1079 ip6_sk_dst_lookup_flow+0x5ed/0xc50 net/ipv6/ip6_output.c:1117 udpv6_sendmsg+0x2163/0x36b0 net/ipv6/udp.c:1354 inet_sendmsg+0x1a1/0x690 net/ipv4/af_inet.c:798 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xd5/0x120 net/socket.c:632 ___sys_sendmsg+0x51d/0x930 net/socket.c:2115 __sys_sendmmsg+0x240/0x6f0 net/socket.c:2210 __do_sys_sendmmsg net/socket.c:2239 [inline] __se_sys_sendmmsg net/socket.c:2236 [inline] __x64_sys_sendmmsg+0x9d/0x100 net/socket.c:2236 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x446a29 Code: e8 ac b8 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 eb 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f4de5532db8 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00000000006dcc38 RCX: 0000000000446a29 RDX: 00000000000000b8 RSI: 0000000020001b00 RDI: 0000000000000003 RBP: 00000000006dcc30 R08: 00007f4de5533700 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dcc3c R13: 00007ffe2b830fdf R14: 00007f4de55339c0 R15: 0000000000000001 Allocated by task 4576: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:490 kmem_cache_alloc+0x12e/0x760 mm/slab.c:3554 dst_alloc+0xbb/0x1d0 net/core/dst.c:105 ip6_dst_alloc+0x35/0xa0 net/ipv6/route.c:353 ip6_rt_pcpu_alloc net/ipv6/route.c:1229 [inline] rt6_make_pcpu_route net/ipv6/route.c:1259 [inline] ip6_pol_route+0x6e4/0xd20 net/ipv6/route.c:1925 ip6_pol_route_output+0x54/0x70 net/ipv6/route.c:2098 fib6_rule_lookup+0x283/0x890 net/ipv6/fib6_rules.c:122 ip6_route_output_flags+0x2c5/0x350 net/ipv6/route.c:2126 ip6_route_output include/net/ip6_route.h:88 [inline] ip6_dst_lookup_tail+0xe3f/0x1da0 net/ipv6/ip6_output.c:951 ip6_dst_lookup_flow+0xc8/0x270 net/ipv6/ip6_output.c:1079 ip6_datagram_dst_update+0x75b/0xf80 net/ipv6/datagram.c:91 __ip6_datagram_connect+0x5fe/0x1470 net/ipv6/datagram.c:250 ip6_datagram_connect+0x2f/0x50 net/ipv6/datagram.c:273 inet_dgram_connect+0x154/0x2e0 net/ipv4/af_inet.c:571 __sys_connect+0x37d/0x4c0 net/socket.c:1663 __do_sys_connect net/socket.c:1674 [inline] __se_sys_connect net/socket.c:1671 [inline] __x64_sys_connect+0x73/0xb0 net/socket.c:1671 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 4828: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kmem_cache_free+0x86/0x2d0 mm/slab.c:3756 dst_destroy+0x267/0x3c0 net/core/dst.c:141 dst_destroy_rcu+0x16/0x20 net/core/dst.c:154 __rcu_reclaim kernel/rcu/rcu.h:236 [inline] rcu_do_batch kernel/rcu/tree.c:2576 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2880 [inline] __rcu_process_callbacks kernel/rcu/tree.c:2847 [inline] rcu_process_callbacks+0xf98/0x2860 kernel/rcu/tree.c:2864 __do_softirq+0x2e8/0xb17 kernel/softirq.c:292 The buggy address belongs to the object at ffff8801aea9a840 which belongs to the cache ip6_dst_cache of size 240 The buggy address is located 64 bytes inside of 240-byte region [ffff8801aea9a840, ffff8801aea9a930) The buggy address belongs to the page: page:ffffea0006baa680 count:1 mapcount:0 mapping:ffff8801cdeb2c40 index:0x0 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffffea00075dfb48 ffffea00074cf048 ffff8801cdeb2c40 raw: 0000000000000000 ffff8801aea9a0c0 000000010000000c 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801aea9a780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc ffff8801aea9a800: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb >ffff8801aea9a880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8801aea9a900: fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc ffff8801aea9a980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================