On Tue, Apr 25, 2017 at 6:36 PM, Andrey Konovalov <andreyk...@google.com> wrote: > On Tue, Apr 25, 2017 at 5:56 PM, David Ahern <d...@cumulusnetworks.com> wrote: >> On 3/4/17 11:57 AM, Dmitry Vyukov wrote: >>> ================================================================== >>> BUG: KASAN: slab-out-of-bounds in rt6_dump_route+0x293/0x2f0 >>> net/ipv6/route.c:3551 at addr ffff88007e523694 >>> Read of size 4 by task syz-executor3/24426 >>> CPU: 2 PID: 24426 Comm: syz-executor3 Not tainted 4.10.0+ #293 >>> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 >>> Call Trace: >>> __dump_stack lib/dump_stack.c:16 [inline] >>> dump_stack+0x2fb/0x3fd lib/dump_stack.c:52 >>> kasan_object_err+0x1c/0x90 mm/kasan/report.c:166 >>> print_address_description mm/kasan/report.c:208 [inline] >>> kasan_report_error mm/kasan/report.c:292 [inline] >>> kasan_report.part.2+0x1b0/0x460 mm/kasan/report.c:314 >>> kasan_report mm/kasan/report.c:334 [inline] >>> __asan_report_load4_noabort+0x29/0x30 mm/kasan/report.c:334 >>> rt6_dump_route+0x293/0x2f0 net/ipv6/route.c:3551 >>> fib6_dump_node+0x101/0x1a0 net/ipv6/ip6_fib.c:315 >>> fib6_walk_continue+0x4b3/0x620 net/ipv6/ip6_fib.c:1576 >>> fib6_walk+0x91/0xf0 net/ipv6/ip6_fib.c:1621 >>> fib6_dump_table net/ipv6/ip6_fib.c:374 [inline] >>> inet6_dump_fib+0x832/0xea0 net/ipv6/ip6_fib.c:447 >> >> My expectation is that this one is fixed with the ipv6 patch I have sent >> (not yet committed). Are you seeing this backtrace with that patch? > > Before applying your patch I was hitting reports related to fib6 all the time. > I've stopped seeing them for some time after I applied your patch. > However today another one was triggered:
I'll keep fuzzing in the meantime to make sure. Maybe I'll be able to collect more reports or even another reproducer. > > ================================================================== > BUG: KASAN: slab-out-of-bounds in find_rr_leaf net/ipv6/route.c:722 > [inline] at addr ffff880033dddaa8 > BUG: KASAN: slab-out-of-bounds in rt6_select net/ipv6/route.c:758 > [inline] at addr ffff880033dddaa8 > BUG: KASAN: slab-out-of-bounds in ip6_pol_route+0x1b1e/0x1ba0 > net/ipv6/route.c:1091 at addr ffff880033dddaa8 > Read of size 4 by task syz-executor7/9808 > CPU: 2 PID: 9808 Comm: syz-executor7 Not tainted 4.11.0-rc8+ #268 > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 > Call Trace: > __dump_stack lib/dump_stack.c:16 [inline] > dump_stack+0x192/0x22d lib/dump_stack.c:52 > kasan_object_err+0x1c/0x70 mm/kasan/report.c:164 > print_address_description mm/kasan/report.c:202 [inline] > kasan_report_error mm/kasan/report.c:291 [inline] > kasan_report+0x252/0x510 mm/kasan/report.c:347 > __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:367 > find_rr_leaf net/ipv6/route.c:722 [inline] > rt6_select net/ipv6/route.c:758 [inline] > ip6_pol_route+0x1b1e/0x1ba0 net/ipv6/route.c:1091 > ip6_pol_route_output+0x4c/0x60 net/ipv6/route.c:1212 > fib6_rule_action+0x261/0x8a0 net/ipv6/fib6_rules.c:100 > fib_rules_lookup+0x34b/0xae0 net/core/fib_rules.c:265 > fib6_rule_lookup+0x175/0x360 net/ipv6/fib6_rules.c:44 > ip6_route_output_flags+0x260/0x2f0 net/ipv6/route.c:1240 > ip6_route_output include/net/ip6_route.h:79 [inline] > ip6_dst_lookup_tail+0xe59/0x1640 net/ipv6/ip6_output.c:959 > ip6_dst_lookup_flow+0xb1/0x260 net/ipv6/ip6_output.c:1082 > ip6_sk_dst_lookup_flow+0x2c6/0x7f0 net/ipv6/ip6_output.c:1113 > udpv6_sendmsg+0x2350/0x3310 net/ipv6/udp.c:1219 > inet_sendmsg+0x164/0x490 net/ipv4/af_inet.c:762 > sock_sendmsg_nosec net/socket.c:633 [inline] > sock_sendmsg+0xca/0x110 net/socket.c:643 > SYSC_sendto+0x660/0x810 net/socket.c:1696 > SyS_sendto+0x40/0x50 net/socket.c:1664 > entry_SYSCALL_64_fastpath+0x1a/0xa9 > RIP: 0033:0x4458d9 > RSP: 002b:00007ff3a5343b58 EFLAGS: 00000282 ORIG_RAX: 000000000000002c > RAX: ffffffffffffffda RBX: 0000000000708000 RCX: 00000000004458d9 > RDX: 0000000000000fa8 RSI: 0000000020000000 RDI: 0000000000000005 > RBP: 0000000000004300 R08: 0000000020006000 R09: 000000000000001c > R10: 0000000000040000 R11: 0000000000000282 R12: 00000000006e33c0 > R13: 0000000000000005 R14: 0000000000000029 R15: 0000000000000023 > Object at ffff880033ddd940, in cache ip_dst_cache size: 224 > Allocated: > PID = 9717 > save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 > save_stack+0x43/0xd0 mm/kasan/kasan.c:513 > set_track mm/kasan/kasan.c:525 [inline] > kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:616 > kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:555 > slab_post_alloc_hook mm/slab.h:456 [inline] > slab_alloc_node mm/slub.c:2718 [inline] > slab_alloc mm/slub.c:2726 [inline] > kmem_cache_alloc+0xa8/0x160 mm/slub.c:2731 > dst_alloc+0x11b/0x1a0 net/core/dst.c:209 > rt_dst_alloc+0xf0/0x5d0 net/ipv4/route.c:1497 > __mkroute_output net/ipv4/route.c:2181 [inline] > __ip_route_output_key_hash+0xdc4/0x2930 net/ipv4/route.c:2391 > __ip_route_output_key include/net/route.h:123 [inline] > ip_route_output_flow+0x29/0xa0 net/ipv4/route.c:2477 > ip_route_output_key include/net/route.h:133 [inline] > sctp_v4_get_dst+0x606/0x1420 net/sctp/protocol.c:458 > sctp_transport_route+0xa8/0x420 net/sctp/transport.c:287 > sctp_assoc_add_peer+0x5a5/0x1470 net/sctp/associola.c:656 > sctp_sendmsg+0x18a8/0x3b50 net/sctp/socket.c:1871 > inet_sendmsg+0x164/0x490 net/ipv4/af_inet.c:762 > sock_sendmsg_nosec net/socket.c:633 [inline] > sock_sendmsg+0xca/0x110 net/socket.c:643 > SYSC_sendto+0x660/0x810 net/socket.c:1696 > SyS_sendto+0x40/0x50 net/socket.c:1664 > entry_SYSCALL_64_fastpath+0x1a/0xa9 > Freed: > PID = 868 > save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 > save_stack+0x43/0xd0 mm/kasan/kasan.c:513 > set_track mm/kasan/kasan.c:525 [inline] > kasan_slab_free+0x73/0xc0 mm/kasan/kasan.c:589 > slab_free_hook mm/slub.c:1357 [inline] > slab_free_freelist_hook mm/slub.c:1379 [inline] > slab_free mm/slub.c:2961 [inline] > kmem_cache_free+0x72/0x190 mm/slub.c:2983 > dst_destroy+0x24c/0x390 net/core/dst.c:269 > dst_free include/net/dst.h:428 [inline] > rt_fibinfo_free net/ipv4/fib_semantics.c:155 [inline] > free_fib_info_rcu+0x852/0xa10 net/ipv4/fib_semantics.c:214 > __rcu_reclaim kernel/rcu/rcu.h:118 [inline] > rcu_do_batch.isra.65+0x6de/0xbd0 kernel/rcu/tree.c:2879 > invoke_rcu_callbacks kernel/rcu/tree.c:3142 [inline] > __rcu_process_callbacks kernel/rcu/tree.c:3109 [inline] > rcu_process_callbacks+0x23f/0x810 kernel/rcu/tree.c:3126 > __do_softirq+0x253/0x78b kernel/softirq.c:284 > Memory state around the buggy address: > ffff880033ddd980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > ffff880033ddda00: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc >>ffff880033ddda80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > ^ > ffff880033dddb00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > ffff880033dddb80: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb > ==================================================================. > >> >> -- >> You received this message because you are subscribed to the Google Groups >> "syzkaller" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to syzkaller+unsubscr...@googlegroups.com. >> For more options, visit https://groups.google.com/d/optout.