KASAN: use-after-free Read in tls_sk_proto_cleanup
From: syzbot
Date: Thu Jul 25 2019 - 11:01:42 EST
Hello,
syzbot found the following crash on:
HEAD commit: 9e6dfe80 Add linux-next specific files for 20190724
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=16797ef0600000
kernel config: https://syzkaller.appspot.com/x/.config?x=6cbb8fc2cf2842d7
dashboard link: https://syzkaller.appspot.com/bug?extid=42f653cb62d6b4f1c97b
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+42f653cb62d6b4f1c97b@xxxxxxxxxxxxxxxxxxxxxxxxx
==================================================================
BUG: KASAN: use-after-free in tls_sk_proto_cleanup+0x37f/0x3e0
net/tls/tls_main.c:299
Read of size 1 at addr ffff88808adaacd4 by task syz-executor.2/10709
CPU: 1 PID: 10709 Comm: syz-executor.2 Not tainted 5.3.0-rc1-next-20190724
#50
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+0x172/0x1f0 lib/dump_stack.c:113
print_address_description.cold+0xd4/0x306 mm/kasan/report.c:351
__kasan_report.cold+0x1b/0x36 mm/kasan/report.c:482
kasan_report+0x12/0x17 mm/kasan/common.c:612
__asan_report_load1_noabort+0x14/0x20 mm/kasan/generic_report.c:129
tls_sk_proto_cleanup+0x37f/0x3e0 net/tls/tls_main.c:299
tls_sk_proto_unhash+0x90/0x3f0 net/tls/tls_main.c:330
tcp_set_state+0x5b9/0x7d0 net/ipv4/tcp.c:2235
tcp_done+0xe2/0x320 net/ipv4/tcp.c:3824
tcp_reset+0x132/0x500 net/ipv4/tcp_input.c:4080
tcp_validate_incoming+0xa2d/0x1660 net/ipv4/tcp_input.c:5440
tcp_rcv_established+0x6b5/0x1e70 net/ipv4/tcp_input.c:5648
tcp_v6_do_rcv+0x41e/0x12c0 net/ipv6/tcp_ipv6.c:1356
sk_backlog_rcv include/net/sock.h:945 [inline]
__release_sock+0x129/0x390 net/core/sock.c:2418
release_sock+0x59/0x1c0 net/core/sock.c:2934
sk_stream_wait_memory+0x65a/0xfc0 net/core/stream.c:149
tls_sw_sendmsg+0x673/0x17b0 net/tls/tls_sw.c:1054
inet6_sendmsg+0x9e/0xe0 net/ipv6/af_inet6.c:576
sock_sendmsg_nosec net/socket.c:637 [inline]
sock_sendmsg+0xd7/0x130 net/socket.c:657
__sys_sendto+0x262/0x380 net/socket.c:1952
__do_sys_sendto net/socket.c:1964 [inline]
__se_sys_sendto net/socket.c:1960 [inline]
__x64_sys_sendto+0xe1/0x1a0 net/socket.c:1960
do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x459829
Code: fd b7 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 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f9e6411bc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 0000000000459829
RDX: ffffffffffffffc1 RSI: 00000000200005c0 RDI: 0000000000000005
RBP: 000000000075bf20 R08: 0000000000000000 R09: 1201000000003618
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f9e6411c6d4
R13: 00000000004c7669 R14: 00000000004dcc70 R15: 00000000ffffffff
Allocated by task 10709:
save_stack+0x23/0x90 mm/kasan/common.c:69
set_track mm/kasan/common.c:77 [inline]
__kasan_kmalloc mm/kasan/common.c:487 [inline]
__kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:460
kasan_kmalloc+0x9/0x10 mm/kasan/common.c:501
kmem_cache_alloc_trace+0x158/0x790 mm/slab.c:3550
kmalloc include/linux/slab.h:552 [inline]
kzalloc include/linux/slab.h:748 [inline]
create_ctx+0x46/0x260 net/tls/tls_main.c:657
tls_init net/tls/tls_main.c:851 [inline]
tls_init+0x134/0x560 net/tls/tls_main.c:830
__tcp_set_ulp net/ipv4/tcp_ulp.c:139 [inline]
tcp_set_ulp+0x330/0x640 net/ipv4/tcp_ulp.c:160
do_tcp_setsockopt.isra.0+0x363/0x24f0 net/ipv4/tcp.c:2810
tcp_setsockopt+0xbe/0xe0 net/ipv4/tcp.c:3137
sock_common_setsockopt+0x94/0xd0 net/core/sock.c:3130
__sys_setsockopt+0x261/0x4c0 net/socket.c:2084
__do_sys_setsockopt net/socket.c:2100 [inline]
__se_sys_setsockopt net/socket.c:2097 [inline]
__x64_sys_setsockopt+0xbe/0x150 net/socket.c:2097
do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
Freed by task 16209:
save_stack+0x23/0x90 mm/kasan/common.c:69
set_track mm/kasan/common.c:77 [inline]
__kasan_slab_free+0x102/0x150 mm/kasan/common.c:449
kasan_slab_free+0xe/0x10 mm/kasan/common.c:457
__cache_free mm/slab.c:3425 [inline]
kfree+0x10a/0x2c0 mm/slab.c:3756
tls_ctx_free.part.0+0x3a/0x40 net/tls/tls_main.c:261
tls_ctx_free net/tls/tls_main.c:256 [inline]
tls_ctx_free_deferred+0x9f/0x130 net/tls/tls_main.c:282
process_one_work+0x9af/0x1740 kernel/workqueue.c:2269
worker_thread+0x98/0xe40 kernel/workqueue.c:2415
kthread+0x361/0x430 kernel/kthread.c:255
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
The buggy address belongs to the object at ffff88808adaacc0
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 20 bytes inside of
512-byte region [ffff88808adaacc0, ffff88808adaaec0)
The buggy address belongs to the page:
page:ffffea00022b6a80 refcount:1 mapcount:0 mapping:ffff8880aa400a80
index:0xffff88808adaa540
flags: 0x1fffc0000000200(slab)
raw: 01fffc0000000200 ffffea0002617408 ffffea00024ed248 ffff8880aa400a80
raw: ffff88808adaa540 ffff88808adaa040 0000000100000005 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff88808adaab80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88808adaac00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff88808adaac80: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
^
ffff88808adaad00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88808adaad80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
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