On Mon, Jan 29, 2018 at 3:58 PM, syzbot <syzbot+551ff4604e832588433e@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > Hello, > > syzbot hit the following crash on upstream commit > 24b1cccf922914f3d6eeb84036dde8338bc03abb (Sun Jan 28 20:24:36 2018 +0000) > Merge branch 'x86-pti-for-linus' of > git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip > > C reproducer is attached. > syzkaller reproducer is attached. > 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+551ff4604e832588433e@xxxxxxxxxxxxxxxxxxxxxxxxx > 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. This was bisected as fixed by: #syz fix: netfilter: xt_RATEEST: acquire xt_rateest_mutex for hash insert https://gist.githubusercontent.com/dvyukov/9d5b710cf4f429969b93aa90ec217c29/raw/68c1fee7f7e133574a0787c9e46d97a6cf521759/gistfile1.txt > ================================================================== > BUG: KASAN: use-after-free in __hlist_del include/linux/list.h:651 [inline] > BUG: KASAN: use-after-free in hlist_del include/linux/list.h:656 [inline] > BUG: KASAN: use-after-free in xt_rateest_put+0x2e3/0x300 > net/netfilter/xt_RATEEST.c:65 > Write of size 8 at addr ffff8801d4d40e58 by task syzkaller770396/3682 > > CPU: 1 PID: 3682 Comm: syzkaller770396 Not tainted 4.15.0-rc9+ #284 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > 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_store8_noabort+0x17/0x20 mm/kasan/report.c:435 > __hlist_del include/linux/list.h:651 [inline] > hlist_del include/linux/list.h:656 [inline] > xt_rateest_put+0x2e3/0x300 net/netfilter/xt_RATEEST.c:65 > xt_rateest_tg_destroy+0x50/0x70 net/netfilter/xt_RATEEST.c:154 > cleanup_entry+0x242/0x380 net/ipv6/netfilter/ip6_tables.c:678 > __do_replace+0x7e6/0xab0 net/ipv6/netfilter/ip6_tables.c:1115 > do_replace net/ipv6/netfilter/ip6_tables.c:1171 [inline] > do_ip6t_set_ctl+0x40f/0x5f0 net/ipv6/netfilter/ip6_tables.c:1693 > nf_sockopt net/netfilter/nf_sockopt.c:106 [inline] > nf_setsockopt+0x67/0xc0 net/netfilter/nf_sockopt.c:115 > ipv6_setsockopt+0x115/0x150 net/ipv6/ipv6_sockglue.c:928 > udpv6_setsockopt+0x45/0x80 net/ipv6/udp.c:1452 > sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2968 > SYSC_setsockopt net/socket.c:1831 [inline] > SyS_setsockopt+0x189/0x360 net/socket.c:1810 > entry_SYSCALL_64_fastpath+0x29/0xa0 > RIP: 0033:0x4412d9 > RSP: 002b:00007fffb8cbf5f8 EFLAGS: 00000203 ORIG_RAX: 0000000000000036 > RAX: ffffffffffffffda RBX: ffffffffffffffff RCX: 00000000004412d9 > RDX: 0000000000000040 RSI: 0000000000000029 RDI: 0000000000000326 > RBP: f6fcce9cd855ec40 R08: 00000000000003b8 R09: 0000000000000000 > R10: 0000000020019c48 R11: 0000000000000203 R12: fbfe5b6031634428 > R13: 5826b2d59f7fe9a1 R14: fd7217c033abf8b5 R15: 0000000000000000 > > Allocated by task 3687: > 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:3610 > kmalloc include/linux/slab.h:499 [inline] > kzalloc include/linux/slab.h:688 [inline] > xt_rateest_tg_checkentry+0x25a/0xaa0 net/netfilter/xt_RATEEST.c:120 > xt_check_target+0x22c/0x7d0 net/netfilter/x_tables.c:845 > check_target net/ipv6/netfilter/ip6_tables.c:538 [inline] > find_check_entry.isra.7+0x935/0xcf0 net/ipv6/netfilter/ip6_tables.c:580 > translate_table+0xf52/0x1690 net/ipv6/netfilter/ip6_tables.c:749 > do_replace net/ipv6/netfilter/ip6_tables.c:1167 [inline] > do_ip6t_set_ctl+0x370/0x5f0 net/ipv6/netfilter/ip6_tables.c:1693 > nf_sockopt net/netfilter/nf_sockopt.c:106 [inline] > nf_setsockopt+0x67/0xc0 net/netfilter/nf_sockopt.c:115 > ipv6_setsockopt+0x115/0x150 net/ipv6/ipv6_sockglue.c:928 > udpv6_setsockopt+0x45/0x80 net/ipv6/udp.c:1452 > sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2968 > SYSC_setsockopt net/socket.c:1831 [inline] > SyS_setsockopt+0x189/0x360 net/socket.c:1810 > entry_SYSCALL_64_fastpath+0x29/0xa0 > > Freed by task 3682: > 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] > kfree+0xd6/0x260 mm/slab.c:3803 > __rcu_reclaim kernel/rcu/rcu.h:190 [inline] > rcu_do_batch kernel/rcu/tree.c:2758 [inline] > invoke_rcu_callbacks kernel/rcu/tree.c:3012 [inline] > __rcu_process_callbacks kernel/rcu/tree.c:2979 [inline] > rcu_process_callbacks+0xe94/0x17f0 kernel/rcu/tree.c:2996 > __do_softirq+0x2d7/0xb85 kernel/softirq.c:285 > > The buggy address belongs to the object at ffff8801d4d40e00 > which belongs to the cache kmalloc-192 of size 192 > The buggy address is located 88 bytes inside of > 192-byte region [ffff8801d4d40e00, ffff8801d4d40ec0) > The buggy address belongs to the page: > page:ffffea0007535000 count:1 mapcount:0 mapping:ffff8801d4d40000 index:0x0 > flags: 0x2fffc0000000100(slab) > raw: 02fffc0000000100 ffff8801d4d40000 0000000000000000 0000000100000010 > raw: ffffea00075251e0 ffff8801dac01148 ffff8801dac00040 0000000000000000 > page dumped because: kasan: bad access detected > > Memory state around the buggy address: > ffff8801d4d40d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff8801d4d40d80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >> >> ffff8801d4d40e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > > ^ > ffff8801d4d40e80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc > ffff8801d4d40f00: 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@xxxxxxxxxxxxxxxx. > > 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 > If you want to test a patch for this bug, please reply with: > #syz test: git://repo/address.git branch > and provide the patch inline or as an attachment. > 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. > > -- > 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/94eb2c0b9a14f575660563eb788d%40google.com. > For more options, visit https://groups.google.com/d/optout. -- To unsubscribe from this list: send the line "unsubscribe netfilter-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
