(+ TLS maintainers and netdev) On 7 November 2018 at 02:38, syzbot <syzbot+e736399a2c4054612307@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > Hello, > > syzbot found the following crash on: > > HEAD commit: 4710e78940d8 Merge tag 'nfs-for-4.20-2' of git://git.linux.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=17a68093400000 > kernel config: https://syzkaller.appspot.com/x/.config?x=9384ecb1c973baed > dashboard link: https://syzkaller.appspot.com/bug?extid=e736399a2c4054612307 > compiler: gcc (GCC) 8.0.1 20180413 (experimental) > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17902f5b400000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=111377e5400000 > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+e736399a2c4054612307@xxxxxxxxxxxxxxxxxxxxxxxxx > > startpar (5496) used greatest stack depth: 15744 bytes left > ================================================================== > BUG: KASAN: use-after-free in memcpy include/linux/string.h:352 [inline] > BUG: KASAN: use-after-free in crypto_gcm_init_common+0xe2/0x710 > crypto/gcm.c:181 > Read of size 12 at addr ffff8801d7b91b00 by task kworker/1:2/3205 > > CPU: 1 PID: 3205 Comm: kworker/1:2 Not tainted 4.19.0+ #320 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > Workqueue: pencrypt padata_parallel_worker > Call Trace: > __dump_stack lib/dump_stack.c:77 [inline] > dump_stack+0x244/0x39d lib/dump_stack.c:113 > print_address_description.cold.7+0x9/0x1ff mm/kasan/report.c:256 > kasan_report_error mm/kasan/report.c:354 [inline] > kasan_report.cold.8+0x242/0x309 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 > memcpy+0x23/0x50 mm/kasan/kasan.c:302 > memcpy include/linux/string.h:352 [inline] > crypto_gcm_init_common+0xe2/0x710 crypto/gcm.c:181 > crypto_gcm_encrypt+0xe2/0x6b0 crypto/gcm.c:479 > crypto_aead_encrypt include/crypto/aead.h:364 [inline] > pcrypt_aead_enc+0xd6/0x340 crypto/pcrypt.c:143 > padata_parallel_worker+0x49d/0x760 kernel/padata.c:86 > process_one_work+0xc90/0x1c40 kernel/workqueue.c:2153 > worker_thread+0x17f/0x1390 kernel/workqueue.c:2296 > kthread+0x35a/0x440 kernel/kthread.c:246 > ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 > > Allocated by task 5668: > save_stack+0x43/0xd0 mm/kasan/kasan.c:448 > set_track mm/kasan/kasan.c:460 [inline] > kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:553 > kmem_cache_alloc_trace+0x152/0x750 mm/slab.c:3620 > kmalloc include/linux/slab.h:546 [inline] > tls_set_sw_offload+0xcb3/0x1390 net/tls/tls_sw.c:1945 > do_tls_setsockopt_conf net/tls/tls_main.c:467 [inline] > do_tls_setsockopt net/tls/tls_main.c:514 [inline] > tls_setsockopt+0x689/0x770 net/tls/tls_main.c:533 > sock_common_setsockopt+0x9a/0xe0 net/core/sock.c:2978 > __sys_setsockopt+0x1ba/0x3c0 net/socket.c:1902 > __do_sys_setsockopt net/socket.c:1913 [inline] > __se_sys_setsockopt net/socket.c:1910 [inline] > __x64_sys_setsockopt+0xbe/0x150 net/socket.c:1910 > do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 > entry_SYSCALL_64_after_hwframe+0x49/0xbe > > Freed by task 5668: > save_stack+0x43/0xd0 mm/kasan/kasan.c:448 > set_track mm/kasan/kasan.c:460 [inline] > __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521 > kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 > __cache_free mm/slab.c:3498 [inline] > kfree+0xcf/0x230 mm/slab.c:3817 > tls_sk_proto_close+0x5fa/0x750 net/tls/tls_main.c:277 > inet_release+0x104/0x1f0 net/ipv4/af_inet.c:428 > inet6_release+0x50/0x70 net/ipv6/af_inet6.c:458 > __sock_release+0xd7/0x250 net/socket.c:579 > sock_close+0x19/0x20 net/socket.c:1141 > __fput+0x385/0xa30 fs/file_table.c:278 > ____fput+0x15/0x20 fs/file_table.c:309 > task_work_run+0x1e8/0x2a0 kernel/task_work.c:113 > tracehook_notify_resume include/linux/tracehook.h:188 [inline] > exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166 > prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] > syscall_return_slowpath arch/x86/entry/common.c:268 [inline] > do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293 > entry_SYSCALL_64_after_hwframe+0x49/0xbe > > The buggy address belongs to the object at ffff8801d7b91b00 > which belongs to the cache kmalloc-32 of size 32 > The buggy address is located 0 bytes inside of > 32-byte region [ffff8801d7b91b00, ffff8801d7b91b20) > The buggy address belongs to the page: > page:ffffea00075ee440 count:1 mapcount:0 mapping:ffff8801da8001c0 > index:0xffff8801d7b91fc1 > flags: 0x2fffc0000000200(slab) > raw: 02fffc0000000200 ffffea00075effc8 ffff8801da801248 ffff8801da8001c0 > raw: ffff8801d7b91fc1 ffff8801d7b91000 000000010000003f 0000000000000000 > page dumped because: kasan: bad access detected > > Memory state around the buggy address: > ffff8801d7b91a00: fb fb fb fb fc fc fc fc 00 00 fc fc fc fc fc fc > ffff8801d7b91a80: 00 00 fc fc fc fc fc fc fb fb fb fb fc fc fc fc >> >> ffff8801d7b91b00: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc > > ^ > ffff8801d7b91b80: fb fb fb fb fc fc fc fc 00 00 fc fc fc fc fc fc > ffff8801d7b91c00: 00 00 00 00 fc fc fc fc fb fb fb fb fc fc fc fc > ================================================================== > > > --- > This bug is generated by a bot. It may contain errors. > See https://goo.gl/tpsmEJ for more information about syzbot. > syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. > > syzbot will keep track of this bug report. See: > https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with > syzbot. > syzbot can test patches for this bug, for details see: > https://goo.gl/tpsmEJ#testing-patches