KASAN: use-after-free Read in tcindex

Title	Replies (including bot)	Last reply
[PATCH 5.5 000/170] 5.5.14-rc1 review	180 (180)	2020/04/02 17:40
[PATCH 5.4 000/155] 5.4.29-rc1 review	156 (156)	2020/03/31 08:59
KASAN: use-after-free Read in tcindex_dump	2 (4)	2020/03/16 19:47
[Patch net] net_sched: hold rtnl lock in tcindex_partial_destroy_work()	4 (4)	2020/03/15 03:43

Title

Replies (including bot)

Last reply

[PATCH 5.5 000/170] 5.5.14-rc1 review

180 (180)

2020/04/02 17:40

[PATCH 5.4 000/155] 5.4.29-rc1 review

156 (156)

2020/03/31 08:59

KASAN: use-after-free Read in tcindex_dump

2 (4)

2020/03/16 19:47

[Patch net] net_sched: hold rtnl lock in tcindex_partial_destroy_work()

4 (4)

2020/03/15 03:43

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
linux-4.14	KASAN: use-after-free Read in tcindex_dump	19				2	1358d	1417d	0/1	auto-obsoleted due to no activity on 2023/03/03 20:07
linux-4.19	KASAN: use-after-free Read in tcindex_dump	19				1	2327d	2327d	0/1	auto-closed as invalid on 2020/07/07 00:51

Created	Duration	User	Patch	Repo	Result
2020/03/11 04:00	18m	xiyou.wangcong@gmail.com		https://github.com/congwang/linux.git tcindex	OK

Created

Duration

User

Patch

Repo

Result

2020/03/11 04:00

18m

xiyou.wangcong@gmail.com

https://github.com/congwang/linux.git tcindex

================================================================== BUG: KASAN: use-after-free in tcindex_dump+0xb6e/0xc20 net/sched/cls_tcindex.c:637 Read of size 8 at addr ffff88807ebd0020 by task syz-executor.3/10006 CPU: 0 PID: 10006 Comm: syz-executor.3 Not tainted 5.6.0-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+0x188/0x20d lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xd3/0x315 mm/kasan/report.c:374 __kasan_report.cold+0x1a/0x32 mm/kasan/report.c:506 kasan_report+0xe/0x20 mm/kasan/common.c:641 tcindex_dump+0xb6e/0xc20 net/sched/cls_tcindex.c:637 tcf_fill_node+0x572/0x930 net/sched/cls_api.c:1814 tfilter_notify+0x139/0x2a0 net/sched/cls_api.c:1840 tc_new_tfilter+0xab2/0x20b0 net/sched/cls_api.c:2107 rtnetlink_rcv_msg+0x810/0xad0 net/core/rtnetlink.c:5427 netlink_rcv_skb+0x15a/0x410 net/netlink/af_netlink.c:2478 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x537/0x740 net/netlink/af_netlink.c:1329 netlink_sendmsg+0x882/0xe10 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:672 ____sys_sendmsg+0x6b9/0x7d0 net/socket.c:2343 ___sys_sendmsg+0x100/0x170 net/socket.c:2397 __sys_sendmsg+0xec/0x1b0 net/socket.c:2430 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45c4a9 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fb7e5f98c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fb7e5f996d4 RCX: 000000000045c4a9 RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 0000000000000004 RBP: 000000000076bfc0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000009fa R14: 00000000004cc777 R15: 000000000076bfcc Allocated by task 10000: save_stack+0x1b/0x80 mm/kasan/common.c:72 set_track mm/kasan/common.c:80 [inline] __kasan_kmalloc mm/kasan/common.c:515 [inline] __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:488 __do_kmalloc mm/slab.c:3656 [inline] __kmalloc+0x161/0x7a0 mm/slab.c:3665 kmalloc_array include/linux/slab.h:597 [inline] kcalloc include/linux/slab.h:608 [inline] tcindex_alloc_perfect_hash+0x5a/0x320 net/sched/cls_tcindex.c:281 tcindex_set_parms+0x1568/0x1a00 net/sched/cls_tcindex.c:405 tcindex_change+0x203/0x2e0 net/sched/cls_tcindex.c:518 tc_new_tfilter+0xa59/0x20b0 net/sched/cls_api.c:2103 rtnetlink_rcv_msg+0x810/0xad0 net/core/rtnetlink.c:5427 netlink_rcv_skb+0x15a/0x410 net/netlink/af_netlink.c:2478 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x537/0x740 net/netlink/af_netlink.c:1329 netlink_sendmsg+0x882/0xe10 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:672 ____sys_sendmsg+0x6b9/0x7d0 net/socket.c:2343 ___sys_sendmsg+0x100/0x170 net/socket.c:2397 __sys_sendmsg+0xec/0x1b0 net/socket.c:2430 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 262: save_stack+0x1b/0x80 mm/kasan/common.c:72 set_track mm/kasan/common.c:80 [inline] kasan_set_free_info mm/kasan/common.c:337 [inline] __kasan_slab_free+0xf7/0x140 mm/kasan/common.c:476 __cache_free mm/slab.c:3426 [inline] kfree+0x109/0x2b0 mm/slab.c:3757 tcindex_partial_destroy_work+0x2e/0x50 net/sched/cls_tcindex.c:264 process_one_work+0x94b/0x1690 kernel/workqueue.c:2264 worker_thread+0x96/0xe20 kernel/workqueue.c:2410 kthread+0x357/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 The buggy address belongs to the object at ffff88807ebd0000 which belongs to the cache kmalloc-16k of size 16384 The buggy address is located 32 bytes inside of 16384-byte region [ffff88807ebd0000, ffff88807ebd4000) The buggy address belongs to the page: page:ffffea0001faf400 refcount:1 mapcount:0 mapping:ffff8880aa002380 index:0x0 compound_mapcount: 0 flags: 0xfffe0000010200(slab|head) raw: 00fffe0000010200 ffffea0001faf208 ffffea0001faf608 ffff8880aa002380 raw: 0000000000000000 ffff88807ebd0000 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88807ebcff00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807ebcff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc