On Wed, Jun 13, 2018 at 4:51 AM, syzbot <syzbot+4c20b3866171ce8441d2@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > syzbot has found a reproducer for the following crash on: Woohoo! Please take a look, this is a top crasher. > HEAD commit: f0dc7f9c6dd9 Merge git://git.kernel.org/pub/scm/linux/kern.. > git tree: net-next > console output: https://syzkaller.appspot.com/x/log.txt?x=1461f03f800000 > kernel config: https://syzkaller.appspot.com/x/.config?x=fa9c20c48788d1c1 > dashboard link: https://syzkaller.appspot.com/bug?extid=4c20b3866171ce8441d2 > compiler: gcc (GCC) 8.0.1 20180413 (experimental) > syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=16cbfeaf800000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=165227f7800000 > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+4c20b3866171ce8441d2@xxxxxxxxxxxxxxxxxxxxxxxxx > > IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready > 8021q: adding VLAN 0 to HW filter on device team0 > IPVS: ftp: loaded support on port[0] = 21 > IPVS: ftp: loaded support on port[0] = 21 > ================================================================== > BUG: KASAN: use-after-free in atomic_read > include/asm-generic/atomic-instrumented.h:21 [inline] > BUG: KASAN: use-after-free in refcount_read include/linux/refcount.h:42 > [inline] > BUG: KASAN: use-after-free in check_net include/net/net_namespace.h:236 > [inline] > BUG: KASAN: use-after-free in rds_destroy_pending net/rds/rds.h:897 [inline] > BUG: KASAN: use-after-free in rds_cong_queue_updates+0x255/0x590 > net/rds/cong.c:226 > Read of size 4 at addr ffff8801ab180044 by task syz-executor199/4800 > > CPU: 1 PID: 4800 Comm: syz-executor199 Not tainted 4.17.0+ #84 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > Call Trace: > __dump_stack lib/dump_stack.c:77 [inline] > dump_stack+0x1b9/0x294 lib/dump_stack.c:113 > print_address_description+0x6c/0x20b mm/kasan/report.c:256 > kasan_report_error mm/kasan/report.c:354 [inline] > kasan_report.cold.7+0x242/0x2fe 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 > kasan_check_read+0x11/0x20 mm/kasan/kasan.c:272 > atomic_read include/asm-generic/atomic-instrumented.h:21 [inline] > refcount_read include/linux/refcount.h:42 [inline] > check_net include/net/net_namespace.h:236 [inline] > rds_destroy_pending net/rds/rds.h:897 [inline] > rds_cong_queue_updates+0x255/0x590 net/rds/cong.c:226 > rds_recv_rcvbuf_delta.part.3+0x211/0x350 net/rds/recv.c:126 > rds_recv_rcvbuf_delta net/rds/recv.c:735 [inline] > rds_clear_recv_queue+0x2f0/0x4c0 net/rds/recv.c:735 > rds_release+0x15c/0x550 net/rds/af_rds.c:72 > __sock_release+0xd7/0x260 net/socket.c:603 > sock_close+0x19/0x20 net/socket.c:1186 > __fput+0x353/0x890 fs/file_table.c:209 > ____fput+0x15/0x20 fs/file_table.c:243 > task_work_run+0x1e4/0x290 kernel/task_work.c:113 > exit_task_work include/linux/task_work.h:22 [inline] > do_exit+0x1aee/0x2730 kernel/exit.c:865 > do_group_exit+0x16f/0x430 kernel/exit.c:968 > get_signal+0x886/0x1960 kernel/signal.c:2468 > do_signal+0x9c/0x21c0 arch/x86/kernel/signal.c:816 > exit_to_usermode_loop+0x2cf/0x360 arch/x86/entry/common.c:162 > prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] > syscall_return_slowpath arch/x86/entry/common.c:268 [inline] > do_syscall_64+0x6ac/0x800 arch/x86/entry/common.c:293 > entry_SYSCALL_64_after_hwframe+0x49/0xbe > RIP: 0033:0x44f439 > Code: e8 ac be 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 > 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff > 0f 83 5b ff fb ff c3 66 2e 0f 1f 84 00 00 00 00 > RSP: 002b:00007fc65567dcf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca > RAX: fffffffffffffe00 RBX: 00000000006edadc RCX: 000000000044f439 > RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000006edadc > RBP: 00000000006edad8 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 > R13: 00007fff3df31b1f R14: 00007fc65567e9c0 R15: 0000000000000061 > > Allocated by task 4800: > save_stack+0x43/0xd0 mm/kasan/kasan.c:448 > set_track mm/kasan/kasan.c:460 [inline] > kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553 > kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:490 > kmem_cache_alloc+0x12e/0x760 mm/slab.c:3554 > kmem_cache_zalloc include/linux/slab.h:696 [inline] > net_alloc net/core/net_namespace.c:383 [inline] > copy_net_ns+0x159/0x4c0 net/core/net_namespace.c:423 > create_new_namespaces+0x69d/0x8f0 kernel/nsproxy.c:107 > unshare_nsproxy_namespaces+0xc3/0x1f0 kernel/nsproxy.c:206 > ksys_unshare+0x708/0xf90 kernel/fork.c:2411 > __do_sys_unshare kernel/fork.c:2479 [inline] > __se_sys_unshare kernel/fork.c:2477 [inline] > __x64_sys_unshare+0x31/0x40 kernel/fork.c:2477 > do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:290 > entry_SYSCALL_64_after_hwframe+0x49/0xbe > > Freed by task 746: > save_stack+0x43/0xd0 mm/kasan/kasan.c:448 > set_track mm/kasan/kasan.c:460 [inline] > __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521 > kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 > __cache_free mm/slab.c:3498 [inline] > kmem_cache_free+0x86/0x2d0 mm/slab.c:3756 > net_free net/core/net_namespace.c:399 [inline] > net_drop_ns.part.14+0x11a/0x130 net/core/net_namespace.c:406 > net_drop_ns net/core/net_namespace.c:405 [inline] > cleanup_net+0x6a1/0xb20 net/core/net_namespace.c:541 > process_one_work+0xc64/0x1b70 kernel/workqueue.c:2153 > worker_thread+0x181/0x13a0 kernel/workqueue.c:2296 > kthread+0x345/0x410 kernel/kthread.c:240 > ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 > > The buggy address belongs to the object at ffff8801ab180040 > which belongs to the cache net_namespace(17:syz0) of size 8896 > The buggy address is located 4 bytes inside of > 8896-byte region [ffff8801ab180040, ffff8801ab182300) > The buggy address belongs to the page: > page:ffffea0006ac6000 count:1 mapcount:0 mapping:ffff8801aeaa0080 index:0x0 > compound_mapcount: 0 > flags: 0x2fffc0000008100(slab|head) > raw: 02fffc0000008100 ffff8801d3827048 ffff8801d3827048 ffff8801aeaa0080 > raw: 0000000000000000 ffff8801ab180040 0000000100000001 ffff8801ab7cae40 > page dumped because: kasan: bad access detected > page->mem_cgroup:ffff8801ab7cae40 > > Memory state around the buggy address: > ffff8801ab17ff00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff > ffff8801ab17ff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff > ^ > ffff8801ab180080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff8801ab180100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ================================================================== > > -- > 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+unsubscribe@xxxxxxxxxxxxxxxx. > To view this discussion on the web visit > https://groups.google.com/d/msgid/syzkaller-bugs/000000000000a643e4056e7d0db4%40google.com. > > For more options, 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