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Date: Sat, 27 Jan 2018 08:05:01 -0800 From: syzbot <syzbot+9c2fa798948a23cdd3f0@...kaller.appspotmail.com> To: davem@...emloft.net, linux-kernel@...r.kernel.org, linux-rdma@...r.kernel.org, netdev@...r.kernel.org, rds-devel@....oracle.com, santosh.shilimkar@...cle.com, syzkaller-bugs@...glegroups.com Subject: KASAN: use-after-free Read in memcmp Hello, syzbot hit the following crash on net-next commit 9515a2e082f91457db0ecff4b65371d0fb5d9aad (Thu Jan 25 03:37:38 2018 +0000) net/ipv4: Allow send to local broadcast from a socket bound to a VRF Unfortunately, I don't have any reproducer for this crash yet. Raw console output is attached. compiler: gcc (GCC) 7.1.1 20170620 .config is attached. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+9c2fa798948a23cdd3f0@...kaller.appspotmail.com It will help syzbot understand when the bug is fixed. See footer for details. If you forward the report, please keep this part and the footer. ================================================================== BUG: KASAN: use-after-free in memcmp+0xe3/0x160 lib/string.c:861 Read of size 1 at addr ffff8801c026aae0 by task kworker/u4:10/7138 CPU: 1 PID: 7138 Comm: kworker/u4:10 Not tainted 4.15.0-rc9+ #210 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: krdsd rds_send_worker Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:53 print_address_description+0x73/0x250 mm/kasan/report.c:252 kasan_report_error mm/kasan/report.c:351 [inline] kasan_report+0x25b/0x340 mm/kasan/report.c:409 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report.c:427 memcmp+0xe3/0x160 lib/string.c:861 memcmp include/linux/string.h:385 [inline] rhashtable_compare include/linux/rhashtable.h:612 [inline] __rhashtable_lookup include/linux/rhashtable.h:634 [inline] rhashtable_lookup include/linux/rhashtable.h:666 [inline] rhashtable_lookup_fast include/linux/rhashtable.h:692 [inline] rds_find_bound+0x498/0xa10 net/rds/bind.c:63 rds_recv_incoming+0x582/0x11d0 net/rds/recv.c:360 rds_loop_xmit+0x149/0x320 net/rds/loop.c:82 rds_send_xmit+0xa70/0x2480 net/rds/send.c:355 rds_send_worker+0x115/0x2a0 net/rds/threads.c:199 process_one_work+0xbbf/0x1b10 kernel/workqueue.c:2113 worker_thread+0x223/0x1990 kernel/workqueue.c:2247 kthread+0x33c/0x400 kernel/kthread.c:238 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:541 Allocated by task 11357: save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:551 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:489 kmem_cache_alloc+0x12e/0x760 mm/slab.c:3544 sk_prot_alloc+0x65/0x2a0 net/core/sock.c:1465 sk_alloc+0x105/0x1440 net/core/sock.c:1525 rds_create+0x11c/0x660 net/rds/af_rds.c:535 __sock_create+0x4d4/0x850 net/socket.c:1285 sock_create net/socket.c:1325 [inline] SYSC_socket net/socket.c:1355 [inline] SyS_socket+0xeb/0x1d0 net/socket.c:1335 entry_SYSCALL_64_fastpath+0x29/0xa0 Freed by task 11357: save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0x71/0xc0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3488 [inline] kmem_cache_free+0x83/0x2a0 mm/slab.c:3746 sk_prot_free net/core/sock.c:1506 [inline] __sk_destruct+0x628/0x920 net/core/sock.c:1590 sk_destruct+0x47/0x80 net/core/sock.c:1598 __sk_free+0xf1/0x2b0 net/core/sock.c:1609 sk_free+0x2a/0x40 net/core/sock.c:1620 sock_put include/net/sock.h:1658 [inline] rds_release+0x3a6/0x520 net/rds/af_rds.c:89 sock_release+0x8d/0x1e0 net/socket.c:595 sock_close+0x16/0x20 net/socket.c:1149 __fput+0x327/0x7e0 fs/file_table.c:210 ____fput+0x15/0x20 fs/file_table.c:244 task_work_run+0x199/0x270 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x296/0x310 arch/x86/entry/common.c:162 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline] syscall_return_slowpath+0x490/0x550 arch/x86/entry/common.c:264 entry_SYSCALL_64_fastpath+0x9e/0xa0 The buggy address belongs to the object at ffff8801c026a680 which belongs to the cache RDS of size 1472 The buggy address is located 1120 bytes inside of 1472-byte region [ffff8801c026a680, ffff8801c026ac40) The buggy address belongs to the page: page:ffffea0007009a80 count:1 mapcount:0 mapping:ffff8801c026a040 index:0x0 compound_mapcount: 0 flags: 0x2fffc0000008100(slab|head) raw: 02fffc0000008100 ffff8801c026a040 0000000000000000 0000000100000005 raw: ffffea0006fe95a0 ffffea0006f689a0 ffff8801d2d22200 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801c026a980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801c026aa00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff8801c026aa80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8801c026ab00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801c026ab80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== --- This bug is generated by a dumb bot. It may contain errors. See https://goo.gl/tpsmEJ for details. Direct all questions to syzkaller@...glegroups.com. syzbot will keep track of this bug report. If you forgot to add the Reported-by tag, once the fix for this bug is merged into any tree, please reply to this email with: #syz fix: exact-commit-title To mark this as a duplicate of another syzbot report, please reply with: #syz dup: exact-subject-of-another-report If it's a one-off invalid bug report, please reply with: #syz invalid Note: if the crash happens again, it will cause creation of a new bug report. Note: all commands must start from beginning of the line in the email body. View attachment "raw.log.txt" of type "text/plain" (1048576 bytes) View attachment "config.txt" of type "text/plain" (135631 bytes)
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