syzbot


KASAN: use-after-free Read in icmp_sk_exit

Status: auto-closed as invalid on 2019/09/01 20:10
Reported-by: syzbot+3d7fa0f0de0f86d0eb4f@syzkaller.appspotmail.com
First crash: 1437d, last: 1423d
similar bugs (1):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream general protection fault in icmp_sk_exit syz error error 2 475d 560d 0/24 closed as invalid on 2021/12/14 20:02

Sample crash report:
team0 (unregistering): Port device team_slave_0 removed
bond0 (unregistering): Releasing backup interface bond_slave_1
bond0 (unregistering): Releasing backup interface bond_slave_0
bond0 (unregistering): Released all slaves
==================================================================
BUG: KASAN: use-after-free in inet_ctl_sock_destroy include/net/inet_common.h:56 [inline]
BUG: KASAN: use-after-free in icmp_sk_exit+0x1ce/0x1f0 net/ipv4/icmp.c:1188
Read of size 8 at addr ffff888098adeedc by task kworker/u4:7/23885

CPU: 0 PID: 23885 Comm: kworker/u4:7 Not tainted 5.0.0+ #7
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: netns cleanup_net
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x172/0x1f0 lib/dump_stack.c:113
 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:187
 kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:135
 inet_ctl_sock_destroy include/net/inet_common.h:56 [inline]
 icmp_sk_exit+0x1ce/0x1f0 net/ipv4/icmp.c:1188
 ops_exit_list.isra.0+0xb0/0x160 net/core/net_namespace.c:153
 cleanup_net+0x3fb/0x960 net/core/net_namespace.c:551
 process_one_work+0x98e/0x1790 kernel/workqueue.c:2173
 worker_thread+0x98/0xe40 kernel/workqueue.c:2319
 kthread+0x357/0x430 kernel/kthread.c:246
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352

Allocated by task 23621:
 save_stack+0x45/0xd0 mm/kasan/common.c:73
 set_track mm/kasan/common.c:85 [inline]
 __kasan_kmalloc mm/kasan/common.c:495 [inline]
 __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:468
 kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:503
 slab_post_alloc_hook mm/slab.h:440 [inline]
 slab_alloc mm/slab.c:3388 [inline]
 kmem_cache_alloc+0x11a/0x6f0 mm/slab.c:3548
 sk_prot_alloc+0x67/0x2e0 net/core/sock.c:1601
 sk_alloc+0x39/0xf70 net/core/sock.c:1661
 inet_create net/ipv4/af_inet.c:321 [inline]
 inet_create+0x36a/0xe10 net/ipv4/af_inet.c:247
 __sock_create+0x3e6/0x750 net/socket.c:1298
 sock_create_kern+0x3b/0x50 net/socket.c:1344
 inet_ctl_sock_create+0x9d/0x1f0 net/ipv4/af_inet.c:1623
 icmp_sk_init+0x11c/0x4c0 net/ipv4/icmp.c:1204
 ops_init+0xb6/0x410 net/core/net_namespace.c:129
 setup_net+0x2c5/0x730 net/core/net_namespace.c:314
 copy_net_ns+0x1d9/0x340 net/core/net_namespace.c:437
 create_new_namespaces+0x400/0x7b0 kernel/nsproxy.c:107
 unshare_nsproxy_namespaces+0xc2/0x200 kernel/nsproxy.c:206
 ksys_unshare+0x440/0x980 kernel/fork.c:2550
 __do_sys_unshare kernel/fork.c:2618 [inline]
 __se_sys_unshare kernel/fork.c:2616 [inline]
 __x64_sys_unshare+0x31/0x40 kernel/fork.c:2616
 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 23885:
 save_stack+0x45/0xd0 mm/kasan/common.c:73
 set_track mm/kasan/common.c:85 [inline]
 __kasan_slab_free+0x102/0x150 mm/kasan/common.c:457
 kasan_slab_free+0xe/0x10 mm/kasan/common.c:465
 __cache_free mm/slab.c:3494 [inline]
 kmem_cache_free+0x86/0x260 mm/slab.c:3754
 sk_prot_free net/core/sock.c:1642 [inline]
 __sk_destruct+0x4b6/0x6d0 net/core/sock.c:1726
 sk_destruct+0x7b/0x90 net/core/sock.c:1734
 __sk_free+0xce/0x300 net/core/sock.c:1745
 sk_free+0x42/0x50 net/core/sock.c:1756
 sock_put include/net/sock.h:1708 [inline]
 sk_common_release+0x224/0x330 net/core/sock.c:3171
 raw_close+0x22/0x30 net/ipv4/raw.c:708
 inet_release+0x105/0x1f0 net/ipv4/af_inet.c:428
 __sock_release+0x1fe/0x2b0 net/socket.c:579
 sock_release+0x18/0x20 net/socket.c:599
 inet_ctl_sock_destroy include/net/inet_common.h:56 [inline]
 icmp_sk_exit+0x11f/0x1f0 net/ipv4/icmp.c:1188
 ops_exit_list.isra.0+0xb0/0x160 net/core/net_namespace.c:153
 cleanup_net+0x3fb/0x960 net/core/net_namespace.c:551
 process_one_work+0x98e/0x1790 kernel/workqueue.c:2173
 worker_thread+0x98/0xe40 kernel/workqueue.c:2319
 kthread+0x357/0x430 kernel/kthread.c:246
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352

The buggy address belongs to the object at ffff888098adedc0
 which belongs to the cache RAW of size 1328
The buggy address is located 284 bytes inside of
 1328-byte region [ffff888098adedc0, ffff888098adf2f0)
The buggy address belongs to the page:
page:ffffea000262b780 count:1 mapcount:0 mapping:ffff8880a6ae1a80 index:0x0 compound_mapcount: 0
flags: 0x1fffc0000010200(slab|head)
raw: 01fffc0000010200 ffff8880a6ae2f48 ffffea000232a608 ffff8880a6ae1a80
raw: 0000000000000000 ffff888098ade240 0000000100000005 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888098aded80: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
 ffff888098adee00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888098adee80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                    ^
 ffff888098adef00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888098adef80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

Crashes (3):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets Title
ci-upstream-kasan-gce-smack-root 2019/03/05 20:09 upstream 63bdf4284c38 16559f86 .config console log report
ci-upstream-kasan-gce-root 2019/02/22 11:45 upstream 8a61716ff2ab 6a5fcca4 .config console log report
ci-upstream-net-this-kasan-gce 2019/02/20 03:04 net 1f43f400a2cb 4df543c9 .config console log report
* Struck through repros no longer work on HEAD.