On Tue, Oct 24, 2017 at 5:20 PM, syzbot <bot+a9d6dccad76c3e1f6cad1031d8f2292c4f4f0...@syzkaller.appspotmail.com> wrote: > Hello, > > syzkaller hit the following crash on > 80cee03bf1d626db0278271b505d7f5febb37bba > git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git/master > compiler: gcc (GCC) 7.1.1 20170620 > .config is attached > Raw console output is attached. > C reproducer is attached > syzkaller reproducer is attached. See https://goo.gl/kgGztJ > for information about syzkaller reproducers
This also happened on more recent commits, including linux-next 36ef71cae353f88fd6e095e2aaa3e5953af1685d (Oct 19), with a similar signature: ================================================================== BUG: KASAN: slab-out-of-bounds in tipc_nametbl_lookup_dst_nodes+0x448/0x4b0 net/tipc/name_table.c:700 Read of size 4 at addr ffff8801c84aa050 by task syz-executor1/6930 CPU: 0 PID: 6930 Comm: syz-executor1 Not tainted 4.14.0-rc5-next-20171018+ #36 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:16 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:52 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 tipc_nametbl_lookup_dst_nodes+0x448/0x4b0 net/tipc/name_table.c:700 tipc_sendmcast+0x794/0xe70 net/tipc/socket.c:791 __tipc_sendmsg+0xebf/0x1b20 net/tipc/socket.c:1316 tipc_sendmsg+0x50/0x70 net/tipc/socket.c:1250 sock_sendmsg_nosec net/socket.c:632 [inline] sock_sendmsg+0xca/0x110 net/socket.c:642 ___sys_sendmsg+0x755/0x890 net/socket.c:2048 __sys_sendmsg+0xe5/0x210 net/socket.c:2082 SYSC_sendmsg net/socket.c:2093 [inline] SyS_sendmsg+0x2d/0x50 net/socket.c:2089 entry_SYSCALL_64_fastpath+0x1f/0xbe RIP: 0033:0x452719 RSP: 002b:00007fe17302fbe8 EFLAGS: 00000212 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000758020 RCX: 0000000000452719 RDX: 0000000000000000 RSI: 0000000020316000 RDI: 0000000000000013 RBP: 0000000000000082 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006ef1b0 R13: 00000000ffffffff R14: 00007fe1730306d4 R15: 0000000000000000 Allocated by task 3449: 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 kmem_cache_alloc_trace+0x136/0x750 mm/slab.c:3614 kmalloc include/linux/slab.h:502 [inline] kmalloc_array include/linux/slab.h:620 [inline] kcalloc include/linux/slab.h:632 [inline] tipc_subseq_alloc net/tipc/name_table.c:142 [inline] tipc_nameseq_create+0xe8/0x540 net/tipc/name_table.c:153 tipc_nametbl_insert_publ+0xf77/0x17c0 net/tipc/name_table.c:477 tipc_nametbl_publish+0x2aa/0x4f0 net/tipc/name_table.c:762 tipc_net_start+0x26f/0x450 net/tipc/net.c:120 tipc_nl_net_set+0x4cf/0x770 net/tipc/net.c:245 __tipc_nl_compat_doit net/tipc/netlink_compat.c:316 [inline] tipc_nl_compat_doit+0x431/0x660 net/tipc/netlink_compat.c:335 tipc_nl_compat_handle net/tipc/netlink_compat.c:1158 [inline] tipc_nl_compat_recv+0xbe8/0x18f0 net/tipc/netlink_compat.c:1201 genl_family_rcv_msg+0x7b7/0xfb0 net/netlink/genetlink.c:598 genl_rcv_msg+0xb2/0x140 net/netlink/genetlink.c:623 netlink_rcv_skb+0x216/0x440 net/netlink/af_netlink.c:2409 genl_rcv+0x28/0x40 net/netlink/genetlink.c:634 netlink_unicast_kernel net/netlink/af_netlink.c:1273 [inline] netlink_unicast+0x4e8/0x6f0 net/netlink/af_netlink.c:1299 netlink_sendmsg+0xa4a/0xe60 net/netlink/af_netlink.c:1862 sock_sendmsg_nosec net/socket.c:632 [inline] sock_sendmsg+0xca/0x110 net/socket.c:642 sock_write_iter+0x31a/0x5d0 net/socket.c:911 call_write_iter include/linux/fs.h:1770 [inline] new_sync_write fs/read_write.c:468 [inline] __vfs_write+0x684/0x970 fs/read_write.c:481 vfs_write+0x189/0x510 fs/read_write.c:543 SYSC_write fs/read_write.c:588 [inline] SyS_write+0xef/0x220 fs/read_write.c:580 entry_SYSCALL_64_fastpath+0x1f/0xbe Freed by task 1921: 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] kfree+0xca/0x250 mm/slab.c:3807 selinux_cred_free+0x48/0x70 security/selinux/hooks.c:3798 security_cred_free+0x48/0x80 security/security.c:994 put_cred_rcu+0x106/0x400 kernel/cred.c:117 __rcu_reclaim kernel/rcu/rcu.h:172 [inline] rcu_do_batch kernel/rcu/tree.c:2676 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2930 [inline] __rcu_process_callbacks kernel/rcu/tree.c:2897 [inline] rcu_process_callbacks+0xd74/0x17d0 kernel/rcu/tree.c:2914 __do_softirq+0x2d7/0xb85 kernel/softirq.c:284 The buggy address belongs to the object at ffff8801c84aa040 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 16 bytes inside of 32-byte region [ffff8801c84aa040, ffff8801c84aa060) The buggy address belongs to the page: page:ffffea0007212a80 count:1 mapcount:0 mapping:ffff8801c84aa000 index:0xffff8801c84aafc1 flags: 0x200000000000100(slab) raw: 0200000000000100 ffff8801c84aa000 ffff8801c84aafc1 000000010000003c raw: ffffea000721cf60 ffffea00072f2ba0 ffff8801dac001c0 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801c84a9f00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff8801c84a9f80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff8801c84aa000: fb fb fb fb fc fc fc fc 00 00 fc fc fc fc fc fc ^ ffff8801c84aa080: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ffff8801c84aa100: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ================================================================== > BUG: KASAN: slab-out-of-bounds in tipc_nametbl_lookup_dst_nodes+0x4a3/0x4b0 > net/tipc/name_table.c:670 > Read of size 4 at addr ffff8801d3275f10 by task syzkaller601354/2981 > > CPU: 1 PID: 2981 Comm: syzkaller601354 Not tainted 4.13.0+ #42 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > Call Trace: > __dump_stack lib/dump_stack.c:16 [inline] > dump_stack+0x194/0x257 lib/dump_stack.c:52 > print_address_description+0x73/0x250 mm/kasan/report.c:252 > kasan_report_error mm/kasan/report.c:351 [inline] > kasan_report+0x24e/0x340 mm/kasan/report.c:409 > __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:429 > tipc_nametbl_lookup_dst_nodes+0x4a3/0x4b0 net/tipc/name_table.c:670 > tipc_sendmcast+0x704/0xe30 net/tipc/socket.c:767 > __tipc_sendmsg+0xf49/0x1590 net/tipc/socket.c:971 > __tipc_sendstream+0x8eb/0xc00 net/tipc/socket.c:1065 > tipc_sendstream+0x50/0x70 net/tipc/socket.c:1039 > tipc_send_packet+0x33/0x50 net/tipc/socket.c:1113 > sock_sendmsg_nosec net/socket.c:633 [inline] > sock_sendmsg+0xca/0x110 net/socket.c:643 > ___sys_sendmsg+0x75b/0x8a0 net/socket.c:2049 > __sys_sendmsg+0xe5/0x210 net/socket.c:2083 > SYSC_sendmsg net/socket.c:2094 [inline] > SyS_sendmsg+0x2d/0x50 net/socket.c:2090 > entry_SYSCALL_64_fastpath+0x1f/0xbe > RIP: 0033:0x43fd79 > RSP: 002b:00007ffcb61e8988 EFLAGS: 00000203 ORIG_RAX: 000000000000002e > RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd79 > RDX: 0000000000000004 RSI: 00000000207ca000 RDI: 0000000000000003 > RBP: 0000000000000082 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000203 R12: 00000000004016e0 > R13: 0000000000401770 R14: 0000000000000000 R15: 0000000000000000 > > Allocated by task 1: > save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 > 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 > kmem_cache_alloc_trace+0x136/0x750 mm/slab.c:3627 > kmalloc include/linux/slab.h:493 [inline] > kmalloc_array include/linux/slab.h:611 [inline] > kcalloc include/linux/slab.h:623 [inline] > tipc_subseq_alloc net/tipc/name_table.c:141 [inline] > tipc_nameseq_create+0xe8/0x540 net/tipc/name_table.c:152 > tipc_nametbl_insert_publ+0xf77/0x17c0 net/tipc/name_table.c:476 > tipc_nametbl_publish+0x2aa/0x4f0 net/tipc/name_table.c:701 > tipc_sk_publish net/tipc/socket.c:2201 [inline] > tipc_bind+0x33a/0x700 net/tipc/socket.c:629 > kernel_bind+0x62/0x80 net/socket.c:3285 > tipc_create_listen_sock net/tipc/server.c:337 [inline] > tipc_open_listening_sock net/tipc/server.c:395 [inline] > tipc_server_start+0x3a1/0xb60 net/tipc/server.c:610 > tipc_topsrv_start+0x64f/0x890 net/tipc/subscr.c:382 > tipc_init_net+0x3cc/0x570 net/tipc/core.c:74 > ops_init+0x10a/0x570 net/core/net_namespace.c:118 > __register_pernet_operations net/core/net_namespace.c:879 [inline] > register_pernet_operations+0x45e/0x980 net/core/net_namespace.c:953 > register_pernet_subsys+0x2a/0x40 net/core/net_namespace.c:995 > tipc_init+0x83/0x104 net/tipc/core.c:136 > do_one_initcall+0x9e/0x330 init/main.c:826 > do_initcall_level init/main.c:892 [inline] > do_initcalls init/main.c:900 [inline] > do_basic_setup init/main.c:918 [inline] > kernel_init_freeable+0x469/0x521 init/main.c:1066 > kernel_init+0x13/0x172 init/main.c:993 > ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:431 > > Freed by task 0: > (stack is not available) > > The buggy address belongs to the object at ffff8801d3275f00 > which belongs to the cache kmalloc-32 of size 32 > The buggy address is located 16 bytes inside of > 32-byte region [ffff8801d3275f00, ffff8801d3275f20) > The buggy address belongs to the page: > page:ffffea00074c9d40 count:1 mapcount:0 mapping:ffff8801d3275000 > index:0xffff8801d3275fc1 > flags: 0x200000000000100(slab) > raw: 0200000000000100 ffff8801d3275000 ffff8801d3275fc1 000000010000003f > raw: ffffea00074c8920 ffffea00074cea20 ffff8801dac001c0 0000000000000000 > page dumped because: kasan: bad access detected > > Memory state around the buggy address: > ffff8801d3275e00: fb fb fb fb fc fc fc fc 00 00 00 fc fc fc fc fc > ffff8801d3275e80: 04 fc fc fc fc fc fc fc 00 00 00 fc fc fc fc fc >> >> ffff8801d3275f00: 00 00 fc fc fc fc fc fc 00 00 00 00 fc fc fc fc > > ^ > ffff8801d3275f80: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc > ffff8801d3276000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > ================================================================== > > > --- > This bug is generated by a dumb bot. It may contain errors. > See https://goo.gl/tpsmEJ for details. > Direct all questions to syzkal...@googlegroups.com. > > syzbot will keep track of this bug report. > Once a fix for this bug is committed, 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. > > -- > You received this message because you are subscribed to the Google Groups > "syzkaller-bugs" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to syzkaller-bugs+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/syzkaller-bugs/001a113ff33e3aa97d055c4c7cd8%40google.com. > For more options, visit https://groups.google.com/d/optout.