syzbot


KASAN: use-after-free Read in inet_csk_reqsk_queue_drop

Status: auto-obsoleted due to no activity on 2024/06/03 00:15
Reported-by: syzbot+deb11ac2f0b7a40eeb90@syzkaller.appspotmail.com
First crash: 93d, last: 82d

Sample crash report:
==================================================================
BUG: KASAN: use-after-free in tcp_or_dccp_get_hashinfo include/net/inet_hashtables.h:186 [inline]
BUG: KASAN: use-after-free in reqsk_queue_unlink net/ipv4/inet_connection_sock.c:956 [inline]
BUG: KASAN: use-after-free in inet_csk_reqsk_queue_drop+0xf3/0x3b0 net/ipv4/inet_connection_sock.c:970
Read of size 8 at addr ffff888149a58500 by task udevd/3001

CPU: 0 PID: 3001 Comm: udevd Not tainted 6.1.82-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:284 [inline]
 print_report+0x15f/0x4f0 mm/kasan/report.c:395
 kasan_report+0x136/0x160 mm/kasan/report.c:495
 tcp_or_dccp_get_hashinfo include/net/inet_hashtables.h:186 [inline]
 reqsk_queue_unlink net/ipv4/inet_connection_sock.c:956 [inline]
 inet_csk_reqsk_queue_drop+0xf3/0x3b0 net/ipv4/inet_connection_sock.c:970
 inet_csk_reqsk_queue_drop_and_put net/ipv4/inet_connection_sock.c:982 [inline]
 reqsk_timer_handler+0x90b/0xe70 net/ipv4/inet_connection_sock.c:1096
 call_timer_fn+0x1ad/0x6b0 kernel/time/timer.c:1474
 expire_timers kernel/time/timer.c:1519 [inline]
 __run_timers+0x67c/0x890 kernel/time/timer.c:1790
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1803
 __do_softirq+0x2e9/0xa4c kernel/softirq.c:571
 invoke_softirq kernel/softirq.c:445 [inline]
 __irq_exit_rcu+0x155/0x240 kernel/softirq.c:650
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:662
 sysvec_apic_timer_interrupt+0x91/0xb0 arch/x86/kernel/apic/apic.c:1106
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:653
RIP: 0010:trace_lock_release include/trace/events/lock.h:69 [inline]
RIP: 0010:lock_release+0xcf/0xa20 kernel/locking/lockdep.c:5673
Code: 0d 0f 86 c2 05 00 00 89 db 48 89 d8 48 c1 e8 06 48 8d 3c c5 a8 62 73 8e be 08 00 00 00 e8 e9 81 77 00 48 0f a3 1d 49 ea 08 0d <73> 0d e8 1a c4 08 00 84 c0 0f 84 c5 05 00 00 48 c7 c0 64 97 73 8e
RSP: 0018:ffffc9000c0c76c0 EFLAGS: 00000257
RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff816a7857
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8e7362a8
RBP: ffffc9000c0c77f8 R08: dffffc0000000000 R09: fffffbfff1ce6c56
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff92001818ee4
R13: ffffffff8197a222 R14: 0000000000000000 R15: dffffc0000000000
 rcu_lock_release include/linux/rcupdate.h:324 [inline]
 rcu_read_unlock include/linux/rcupdate.h:793 [inline]
 is_bpf_text_address+0x289/0x2a0 kernel/bpf/core.c:733
 kernel_text_address+0x9f/0xd0 kernel/extable.c:125
 __kernel_text_address+0x9/0x40 kernel/extable.c:79
 unwind_get_return_address+0x49/0x80 arch/x86/kernel/unwind_orc.c:323
 arch_stack_walk+0xf3/0x140 arch/x86/kernel/stacktrace.c:26
 stack_trace_save+0x113/0x1c0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
 __kasan_slab_alloc+0x65/0x70 mm/kasan/common.c:328
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook+0x52/0x3a0 mm/slab.h:737
 slab_alloc_node mm/slub.c:3398 [inline]
 slab_alloc mm/slub.c:3406 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3413 [inline]
 kmem_cache_alloc+0x10c/0x2d0 mm/slub.c:3422
 getname_flags+0xb8/0x4f0 fs/namei.c:139
 vfs_fstatat fs/stat.c:266 [inline]
 __do_sys_newfstatat fs/stat.c:437 [inline]
 __se_sys_newfstatat fs/stat.c:431 [inline]
 __x64_sys_newfstatat+0x130/0x1e0 fs/stat.c:431
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f4385f165f4
Code: 64 c7 00 09 00 00 00 83 c8 ff c3 48 89 f2 b9 00 01 00 00 48 89 fe bf 9c ff ff ff e9 00 00 00 00 41 89 ca b8 06 01 00 00 0f 05 <45> 31 c0 3d 00 f0 ff ff 76 10 48 8b 15 03 a8 0d 00 f7 d8 41 83 c8
RSP: 002b:00007ffc2455af88 EFLAGS: 00000246 ORIG_RAX: 0000000000000106
RAX: ffffffffffffffda RBX: 00005653bea81a50 RCX: 00007f4385f165f4
RDX: 00007ffc2455af98 RSI: 00007ffc2455b428 RDI: 00000000ffffff9c
RBP: 00007ffc2455b028 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc2455b428
R13: 00007ffc2455af98 R14: 00005653bea5a910 R15: 0000000000000000
 </TASK>

Allocated by task 3580:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
 __kasan_slab_alloc+0x65/0x70 mm/kasan/common.c:328
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook+0x52/0x3a0 mm/slab.h:737
 slab_alloc_node mm/slub.c:3398 [inline]
 slab_alloc mm/slub.c:3406 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3413 [inline]
 kmem_cache_alloc+0x10c/0x2d0 mm/slub.c:3422
 kmem_cache_zalloc include/linux/slab.h:682 [inline]
 net_alloc net/core/net_namespace.c:410 [inline]
 copy_net_ns+0x143/0x5d0 net/core/net_namespace.c:465
 create_new_namespaces+0x425/0x7a0 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0x11e/0x170 kernel/nsproxy.c:226
 ksys_unshare+0x580/0xb20 kernel/fork.c:3203
 __do_sys_unshare kernel/fork.c:3274 [inline]
 __se_sys_unshare kernel/fork.c:3272 [inline]
 __x64_sys_unshare+0x34/0x40 kernel/fork.c:3272
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Last potentially related work creation:
 kasan_save_stack+0x3b/0x60 mm/kasan/common.c:45
 __kasan_record_aux_stack+0xb0/0xc0 mm/kasan/generic.c:486
 insert_work+0x54/0x3d0 kernel/workqueue.c:1361
 __queue_work+0xb4b/0xf90 kernel/workqueue.c:1520
 call_timer_fn+0x1ad/0x6b0 kernel/time/timer.c:1474
 expire_timers kernel/time/timer.c:1514 [inline]
 __run_timers+0x6a8/0x890 kernel/time/timer.c:1790
 __do_softirq+0x2e9/0xa4c kernel/softirq.c:571

The buggy address belongs to the object at ffff888149a58000
 which belongs to the cache net_namespace of size 6976
The buggy address is located 1280 bytes inside of
 6976-byte region [ffff888149a58000, ffff888149a59b40)

The buggy address belongs to the physical page:
page:ffffea0005269600 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888149a58000 pfn:0x149a58
head:ffffea0005269600 order:3 compound_mapcount:0 compound_pincount:0
memcg:ffff8881753b5481
flags: 0x57ff00000010200(slab|head|node=1|zone=2|lastcpupid=0x7ff)
raw: 057ff00000010200 0000000000000000 dead000000000122 ffff888012638500
raw: ffff888149a58000 0000000080040002 00000001ffffffff ffff8881753b5481
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 3580, tgid 3580 (syz-executor.0), ts 195788378453, free_ts 21736827447
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x18d/0x1b0 mm/page_alloc.c:2513
 prep_new_page mm/page_alloc.c:2520 [inline]
 get_page_from_freelist+0x31a1/0x3320 mm/page_alloc.c:4279
 __alloc_pages+0x28d/0x770 mm/page_alloc.c:5545
 alloc_slab_page+0x6a/0x150 mm/slub.c:1794
 allocate_slab mm/slub.c:1939 [inline]
 new_slab+0x84/0x2d0 mm/slub.c:1992
 ___slab_alloc+0xc20/0x1270 mm/slub.c:3180
 __slab_alloc mm/slub.c:3279 [inline]
 slab_alloc_node mm/slub.c:3364 [inline]
 slab_alloc mm/slub.c:3406 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3413 [inline]
 kmem_cache_alloc+0x1a5/0x2d0 mm/slub.c:3422
 kmem_cache_zalloc include/linux/slab.h:682 [inline]
 net_alloc net/core/net_namespace.c:410 [inline]
 copy_net_ns+0x143/0x5d0 net/core/net_namespace.c:465
 create_new_namespaces+0x425/0x7a0 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0x11e/0x170 kernel/nsproxy.c:226
 ksys_unshare+0x580/0xb20 kernel/fork.c:3203
 __do_sys_unshare kernel/fork.c:3274 [inline]
 __se_sys_unshare kernel/fork.c:3272 [inline]
 __x64_sys_unshare+0x34/0x40 kernel/fork.c:3272
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1440 [inline]
 free_pcp_prepare mm/page_alloc.c:1490 [inline]
 free_unref_page_prepare+0xf63/0x1120 mm/page_alloc.c:3358
 free_unref_page+0x33/0x3e0 mm/page_alloc.c:3453
 free_slab mm/slub.c:2031 [inline]
 discard_slab mm/slub.c:2037 [inline]
 __unfreeze_partials+0x1b7/0x210 mm/slub.c:2586
 put_cpu_partial+0x17b/0x250 mm/slub.c:2662
 qlink_free mm/kasan/quarantine.c:168 [inline]
 qlist_free_all+0x76/0xe0 mm/kasan/quarantine.c:187
 kasan_quarantine_reduce+0x156/0x170 mm/kasan/quarantine.c:294
 __kasan_slab_alloc+0x1f/0x70 mm/kasan/common.c:305
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook+0x52/0x3a0 mm/slab.h:737
 slab_alloc_node mm/slub.c:3398 [inline]
 slab_alloc mm/slub.c:3406 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3413 [inline]
 kmem_cache_alloc+0x10c/0x2d0 mm/slub.c:3422
 getname_flags+0xb8/0x4f0 fs/namei.c:139
 vfs_fstatat fs/stat.c:266 [inline]
 __do_sys_newfstatat fs/stat.c:437 [inline]
 __se_sys_newfstatat fs/stat.c:431 [inline]
 __x64_sys_newfstatat+0x130/0x1e0 fs/stat.c:431
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Memory state around the buggy address:
 ffff888149a58400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888149a58480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888149a58500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff888149a58580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888149a58600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
   0:	0d 0f 86 c2 05       	or     $0x5c2860f,%eax
   5:	00 00                	add    %al,(%rax)
   7:	89 db                	mov    %ebx,%ebx
   9:	48 89 d8             	mov    %rbx,%rax
   c:	48 c1 e8 06          	shr    $0x6,%rax
  10:	48 8d 3c c5 a8 62 73 	lea    -0x718c9d58(,%rax,8),%rdi
  17:	8e
  18:	be 08 00 00 00       	mov    $0x8,%esi
  1d:	e8 e9 81 77 00       	call   0x77820b
  22:	48 0f a3 1d 49 ea 08 	bt     %rbx,0xd08ea49(%rip)        # 0xd08ea73
  29:	0d
* 2a:	73 0d                	jae    0x39 <-- trapping instruction
  2c:	e8 1a c4 08 00       	call   0x8c44b
  31:	84 c0                	test   %al,%al
  33:	0f 84 c5 05 00 00    	je     0x5fe
  39:	48 c7 c0 64 97 73 8e 	mov    $0xffffffff8e739764,%rax

Crashes (11):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/03/25 00:14 linux-6.1.y d7543167affd 0ea90952 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in inet_csk_reqsk_queue_drop
2024/03/22 22:12 linux-6.1.y d7543167affd 4b6cdce6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in inet_csk_reqsk_queue_drop
2024/03/18 13:08 linux-6.1.y d7543167affd baa80228 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in inet_csk_reqsk_queue_drop
2024/03/16 23:23 linux-6.1.y d7543167affd d615901c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in inet_csk_reqsk_queue_drop
2024/03/16 15:29 linux-6.1.y d7543167affd d615901c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Read in inet_csk_reqsk_queue_drop
2024/03/25 00:14 linux-6.1.y d7543167affd 0ea90952 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: use-after-free Read in inet_csk_reqsk_queue_drop
2024/03/21 06:14 linux-6.1.y d7543167affd 6753db5c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: use-after-free Read in inet_csk_reqsk_queue_drop
2024/03/20 16:32 linux-6.1.y d7543167affd 5b7d42ae .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: use-after-free Read in inet_csk_reqsk_queue_drop
2024/03/16 18:18 linux-6.1.y d7543167affd d615901c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: use-after-free Read in inet_csk_reqsk_queue_drop
2024/03/15 20:24 linux-6.1.y d7543167affd d615901c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: use-after-free Read in inet_csk_reqsk_queue_drop
2024/03/14 15:20 linux-6.1.y 61adba85cc40 8d8ee116 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: use-after-free Read in inet_csk_reqsk_queue_drop
* Struck through repros no longer work on HEAD.