Messages in this thread | | | Date | Fri, 17 Sep 2021 21:29:20 -0700 | Subject | Re: [syzbot] KASAN: use-after-free Write in nr_release | From | syzbot <> |
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syzbot has found a reproducer for the following issue on:
HEAD commit: ddf21bd8ab98 Merge tag 'iov_iter.3-5.15-2021-09-17' of git.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=10b5b7e7300000 kernel config: https://syzkaller.appspot.com/x/.config?x=ccfb8533b1cbe3b1 dashboard link: https://syzkaller.appspot.com/bug?extid=caa188bdfc1eeafeb418 compiler: Debian clang version 11.0.1-2, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13cf5753300000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13a860f7300000
Bisection is inconclusive: the first bad commit could be any of:
9211bfbff80a netfilter: add missing IS_ENABLED(CONFIG_BRIDGE_NETFILTER) checks to header-file. 47e640af2e49 netfilter: add missing IS_ENABLED(CONFIG_NF_TABLES) check to header-file. a1b2f04ea527 netfilter: add missing includes to a number of header-files. 0abc8bf4f284 netfilter: add missing IS_ENABLED(CONFIG_NF_CONNTRACK) checks to some header-files. bd96b4c75675 netfilter: inline four headers files into another one. 43dd16efc7f2 netfilter: nf_tables: store data in offload context registers 78458e3e08cd netfilter: add missing IS_ENABLED(CONFIG_NETFILTER) checks to some header-files. 20a9379d9a03 netfilter: remove "#ifdef __KERNEL__" guards from some headers. bd8699e9e292 netfilter: nft_bitwise: add offload support 2a475c409fe8 kbuild: remove all netfilter headers from header-test blacklist. 7e59b3fea2a2 netfilter: remove unnecessary spaces 1b90af292e71 ipvs: Improve robustness to the ipvs sysctl 5785cf15fd74 netfilter: nf_tables: add missing prototypes. 0a30ba509fde netfilter: nf_nat_proto: make tables static e84fb4b3666d netfilter: conntrack: use shared sysctl constants 105333435b4f netfilter: connlabels: prefer static lock initialiser 8c0bb7873815 netfilter: synproxy: rename mss synproxy_options field c162610c7db2 Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1476109ee00000
IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+caa188bdfc1eeafeb418@syzkaller.appspotmail.com
================================================================== BUG: KASAN: use-after-free in instrument_atomic_read_write include/linux/instrumented.h:101 [inline] BUG: KASAN: use-after-free in atomic_fetch_add_relaxed include/linux/atomic/atomic-instrumented.h:111 [inline] BUG: KASAN: use-after-free in __refcount_add include/linux/refcount.h:193 [inline] BUG: KASAN: use-after-free in __refcount_inc include/linux/refcount.h:250 [inline] BUG: KASAN: use-after-free in refcount_inc include/linux/refcount.h:267 [inline] BUG: KASAN: use-after-free in sock_hold include/net/sock.h:702 [inline] BUG: KASAN: use-after-free in nr_release+0x5c/0x430 net/netrom/af_netrom.c:520 Write of size 4 at addr ffff88801b5d4080 by task syz-executor240/6857
CPU: 1 PID: 6857 Comm: syz-executor240 Not tainted 5.15.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1dc/0x2d8 lib/dump_stack.c:106 print_address_description+0x66/0x3e0 mm/kasan/report.c:256 __kasan_report mm/kasan/report.c:442 [inline] kasan_report+0x19a/0x1f0 mm/kasan/report.c:459 kasan_check_range+0x2b5/0x2f0 mm/kasan/generic.c:189 instrument_atomic_read_write include/linux/instrumented.h:101 [inline] atomic_fetch_add_relaxed include/linux/atomic/atomic-instrumented.h:111 [inline] __refcount_add include/linux/refcount.h:193 [inline] __refcount_inc include/linux/refcount.h:250 [inline] refcount_inc include/linux/refcount.h:267 [inline] sock_hold include/net/sock.h:702 [inline] nr_release+0x5c/0x430 net/netrom/af_netrom.c:520 __sock_release net/socket.c:649 [inline] sock_close+0xd8/0x260 net/socket.c:1314 __fput+0x3fe/0x870 fs/file_table.c:280 task_work_run+0x146/0x1c0 kernel/task_work.c:164 exit_task_work include/linux/task_work.h:32 [inline] do_exit+0x6fc/0x2580 kernel/exit.c:825 do_group_exit+0x168/0x2d0 kernel/exit.c:922 get_signal+0x16e0/0x20c0 kernel/signal.c:2868 arch_do_signal_or_restart+0x9c/0x730 arch/x86/kernel/signal.c:865 handle_signal_work kernel/entry/common.c:148 [inline] exit_to_user_mode_loop kernel/entry/common.c:172 [inline] exit_to_user_mode_prepare+0x191/0x220 kernel/entry/common.c:209 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x2e/0x70 kernel/entry/common.c:302 do_syscall_64+0x53/0xd0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f50e35fb3c9 Code: Unable to access opcode bytes at RIP 0x7f50e35fb39f. RSP: 002b:00007ffde62917a8 EFLAGS: 00000246 ORIG_RAX: 000000000000002b RAX: fffffffffffffe00 RBX: 0000000000000003 RCX: 00007f50e35fb3c9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 0000000000000004 R08: 00007ffde62917d0 R09: 00007ffde62917d0 R10: 00007ffde62917d0 R11: 0000000000000246 R12: 000055555635f2c0 R13: 000000000000000b R14: 00007ffde6291820 R15: 0000000000000000
Allocated by task 6857: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc+0xdc/0x110 mm/kasan/common.c:513 kasan_kmalloc include/linux/kasan.h:264 [inline] __kmalloc+0x24d/0x370 mm/slub.c:4391 kmalloc include/linux/slab.h:596 [inline] sk_prot_alloc+0xf4/0x230 net/core/sock.c:1822 sk_alloc+0x35/0x300 net/core/sock.c:1875 nr_create+0x9f/0x4e0 net/netrom/af_netrom.c:433 __sock_create+0x580/0x8d0 net/socket.c:1464 sock_create net/socket.c:1515 [inline] __sys_socket+0x133/0x380 net/socket.c:1557 __do_sys_socket net/socket.c:1566 [inline] __se_sys_socket net/socket.c:1564 [inline] __x64_sys_socket+0x76/0x80 net/socket.c:1564 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae
Freed by task 6857: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:46 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360 ____kasan_slab_free+0x10d/0x150 mm/kasan/common.c:366 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1700 [inline] slab_free_freelist_hook+0x129/0x1a0 mm/slub.c:1725 slab_free mm/slub.c:3483 [inline] kfree+0xcf/0x2f0 mm/slub.c:4543 sk_prot_free net/core/sock.c:1858 [inline] __sk_destruct+0x575/0x820 net/core/sock.c:1943 call_timer_fn+0xf6/0x210 kernel/time/timer.c:1421 expire_timers kernel/time/timer.c:1466 [inline] __run_timers+0x71a/0x910 kernel/time/timer.c:1734 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1747 __do_softirq+0x392/0x7a3 kernel/softirq.c:558
The buggy address belongs to the object at ffff88801b5d4000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 128 bytes inside of 2048-byte region [ffff88801b5d4000, ffff88801b5d4800) The buggy address belongs to the page: page:ffffea00006d7400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1b5d0 head:ffffea00006d7400 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 0000000000000000 dead000000000122 ffff888011042000 raw: 0000000000000000 0000000000080008 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd28c0(GFP_NOWAIT|__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 20, ts 281243236047, free_ts 281237310240 prep_new_page mm/page_alloc.c:2424 [inline] get_page_from_freelist+0x779/0xa30 mm/page_alloc.c:4153 __alloc_pages+0x255/0x580 mm/page_alloc.c:5375 alloc_slab_page mm/slub.c:1763 [inline] allocate_slab+0xcc/0x4d0 mm/slub.c:1900 new_slab mm/slub.c:1963 [inline] ___slab_alloc+0x41e/0xc40 mm/slub.c:2994 __slab_alloc mm/slub.c:3081 [inline] slab_alloc_node mm/slub.c:3172 [inline] __kmalloc_node_track_caller+0x2d9/0x3e0 mm/slub.c:4936 kmalloc_reserve net/core/skbuff.c:355 [inline] pskb_expand_head+0x118/0x10f0 net/core/skbuff.c:1700 netlink_trim+0x17f/0x210 net/netlink/af_netlink.c:1296 netlink_broadcast_filtered+0x6c/0x1110 net/netlink/af_netlink.c:1501 netlink_broadcast net/netlink/af_netlink.c:1546 [inline] nlmsg_multicast include/net/netlink.h:1033 [inline] nlmsg_notify+0x100/0x1c0 net/netlink/af_netlink.c:2547 netdev_state_change+0x1c5/0x270 net/core/dev.c:1389 linkwatch_do_dev+0x10a/0x160 net/core/link_watch.c:167 __linkwatch_run_queue+0x4f5/0x800 net/core/link_watch.c:213 linkwatch_event+0x48/0x50 net/core/link_watch.c:252 process_one_work+0x853/0x1140 kernel/workqueue.c:2297 worker_thread+0xac1/0x1320 kernel/workqueue.c:2444 kthread+0x453/0x480 kernel/kthread.c:319 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1338 [inline] free_pcp_prepare+0xc29/0xd20 mm/page_alloc.c:1389 free_unref_page_prepare mm/page_alloc.c:3315 [inline] free_unref_page+0x7d/0x580 mm/page_alloc.c:3394 free_slab mm/slub.c:2003 [inline] discard_slab mm/slub.c:2009 [inline] __unfreeze_partials+0x1ab/0x200 mm/slub.c:2495 put_cpu_partial+0x132/0x1a0 mm/slub.c:2575 do_slab_free mm/slub.c:3471 [inline] ___cache_free+0xe6/0x120 mm/slub.c:3490 qlist_free_all mm/kasan/quarantine.c:165 [inline] kasan_quarantine_reduce+0x151/0x1c0 mm/kasan/quarantine.c:272 __kasan_slab_alloc+0x2f/0xe0 mm/kasan/common.c:444 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook mm/slab.h:519 [inline] slab_alloc_node mm/slub.c:3206 [inline] slab_alloc mm/slub.c:3214 [inline] kmem_cache_alloc+0x1c3/0x300 mm/slub.c:3219 getname_flags+0xba/0x650 fs/namei.c:138 do_sys_openat2+0xd2/0x500 fs/open.c:1194 do_sys_open fs/open.c:1216 [inline] __do_sys_open fs/open.c:1224 [inline] __se_sys_open fs/open.c:1220 [inline] __x64_sys_open+0x221/0x270 fs/open.c:1220 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae
Memory state around the buggy address: ffff88801b5d3f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88801b5d4000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88801b5d4080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88801b5d4100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801b5d4180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================
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