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Date: Sat, 09 Dec 2017 12:50:01 -0800 From: syzbot <bot+db99bd25cd19d3347dbf8c05d7dd3ca9bab2d7ad@...kaller.appspotmail.com> To: davem@...emloft.net, kuznet@....inr.ac.ru, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, syzkaller-bugs@...glegroups.com, yoshfuji@...ux-ipv6.org Subject: KASAN: use-after-free Read in inet_create Hello, syzkaller hit the following crash on 82bcf1def3b5f1251177ad47c44f7e17af039b4b git://git.cmpxchg.org/linux-mmots.git/master compiler: gcc (GCC) 7.1.1 20170620 .config is attached Raw console output is attached. Unfortunately, I don't have any reproducer for this bug yet. ================================================================== BUG: KASAN: use-after-free in inet_create+0xda0/0xf50 net/ipv4/af_inet.c:338 Read of size 4 at addr ffff8801bde28554 by task kworker/u4:5/3492 CPU: 0 PID: 3492 Comm: kworker/u4:5 Not tainted 4.15.0-rc2-mm1+ #39 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: krdsd rds_connect_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_load4_noabort+0x14/0x20 mm/kasan/report.c:429 inet_create+0xda0/0xf50 net/ipv4/af_inet.c:338 __sock_create+0x4d4/0x850 net/socket.c:1265 sock_create_kern+0x3f/0x50 net/socket.c:1311 rds_tcp_conn_path_connect+0x26f/0x920 net/rds/tcp_connect.c:108 rds_connect_worker+0x156/0x1f0 net/rds/threads.c:165 process_one_work+0xbfd/0x1bc0 kernel/workqueue.c:2113 worker_thread+0x223/0x1990 kernel/workqueue.c:2247 kthread+0x37a/0x440 kernel/kthread.c:238 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:524 Allocated by task 3362: 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:3548 kmem_cache_zalloc include/linux/slab.h:695 [inline] net_alloc net/core/net_namespace.c:362 [inline] copy_net_ns+0x196/0x580 net/core/net_namespace.c:402 create_new_namespaces+0x425/0x880 kernel/nsproxy.c:107 unshare_nsproxy_namespaces+0xae/0x1e0 kernel/nsproxy.c:206 SYSC_unshare kernel/fork.c:2421 [inline] SyS_unshare+0x653/0xfa0 kernel/fork.c:2371 entry_SYSCALL_64_fastpath+0x1f/0x96 Freed by task 35: 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:3492 [inline] kmem_cache_free+0x77/0x280 mm/slab.c:3750 net_free+0xca/0x110 net/core/net_namespace.c:378 net_drop_ns.part.11+0x26/0x30 net/core/net_namespace.c:385 net_drop_ns net/core/net_namespace.c:384 [inline] cleanup_net+0x895/0xb60 net/core/net_namespace.c:502 process_one_work+0xbfd/0x1bc0 kernel/workqueue.c:2113 worker_thread+0x223/0x1990 kernel/workqueue.c:2247 kthread+0x37a/0x440 kernel/kthread.c:238 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:524 The buggy address belongs to the object at ffff8801bde28080 which belongs to the cache net_namespace of size 6272 The buggy address is located 1236 bytes inside of 6272-byte region [ffff8801bde28080, ffff8801bde29900) The buggy address belongs to the page: page:00000000df6a4dc0 count:1 mapcount:0 mapping:00000000553659f1 index:0x0 compound_mapcount: 0 flags: 0x2fffc0000008100(slab|head) raw: 02fffc0000008100 ffff8801bde28080 0000000000000000 0000000100000001 raw: ffffea0006f75da0 ffffea0006f60220 ffff8801d989fe00 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801bde28400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801bde28480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff8801bde28500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8801bde28580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801bde28600: 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. Please credit me with: Reported-by: syzbot <syzkaller@...glegroups.com> syzbot will keep track of this bug report. Once a fix for this bug is merged into any tree, 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 "config.txt" of type "text/plain" (126475 bytes) Download attachment "raw.log" of type "application/octet-stream" (1048576 bytes)
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