syzbot


KASAN: use-after-free Read in io_wqe_worker (2)

Status: auto-obsoleted due to no activity on 2023/06/09 07:06
Subsystems: io-uring
[Documentation on labels]
Reported-by: syzbot+ad53b671c30ddaba634d@syzkaller.appspotmail.com
First crash: 497d, last: 465d
Cause bisection: failed (error log, bisect log)
  
Fix bisection: fixed by (bisect log) :
commit 02767440e1dda9861a11ca1dbe0f19a760b1d5c2
Author: Hayes Wang <hayeswang@realtek.com>
Date: Thu Jan 19 07:40:43 2023 +0000

  r8152: reduce the control transfer of rtl8152_get_version()

  
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] KASAN: use-after-free Read in io_wqe_worker (2) 2 (5) 2023/03/15 12:20
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KASAN: use-after-free Read in io_wqe_worker fs io-uring C error 2 1330d 1331d 15/26 fixed on 2020/11/16 12:12
Last patch testing requests (1)
Created Duration User Patch Repo Result
2023/01/09 13:10 14m asml.silence@gmail.com git://git.kernel.dk/linux.git syztest report log
Fix bisection attempts (2)
Created Duration User Patch Repo Result
2023/03/11 09:18 5h55m bisect fix upstream job log (1)
2023/02/09 06:01 1h04m bisect fix upstream job log (0) log

Sample crash report:
==================================================================
BUG: KASAN: use-after-free in __list_del_entry_valid+0xec/0x110 lib/list_debug.c:62
Read of size 8 at addr ffff88807ba8f020 by task iou-wrk-10331/10338

CPU: 0 PID: 10338 Comm: iou-wrk-10331 Not tainted 6.2.0-rc2-syzkaller-00313-g9b43a525db12 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:306 [inline]
 print_report+0x15e/0x45d mm/kasan/report.c:417
 kasan_report+0xbf/0x1f0 mm/kasan/report.c:517
 __list_del_entry_valid+0xec/0x110 lib/list_debug.c:62
 __list_del_entry include/linux/list.h:134 [inline]
 list_del_rcu include/linux/rculist.h:157 [inline]
 io_worker_exit io_uring/io-wq.c:229 [inline]
 io_wqe_worker+0x852/0xe40 io_uring/io-wq.c:661
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>

Allocated by task 10331:
 kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
 kasan_set_track+0x25/0x30 mm/kasan/common.c:52
 ____kasan_kmalloc mm/kasan/common.c:371 [inline]
 ____kasan_kmalloc mm/kasan/common.c:330 [inline]
 __kasan_kmalloc+0xa5/0xb0 mm/kasan/common.c:380
 kmalloc_node include/linux/slab.h:606 [inline]
 kzalloc_node include/linux/slab.h:731 [inline]
 create_io_worker+0x10c/0x630 io_uring/io-wq.c:801
 io_wqe_create_worker io_uring/io-wq.c:310 [inline]
 io_wqe_enqueue+0x6c3/0xbc0 io_uring/io-wq.c:936
 io_queue_iowq+0x282/0x5c0 io_uring/io_uring.c:475
 io_queue_sqe_fallback+0xf3/0x190 io_uring/io_uring.c:2059
 io_submit_sqe io_uring/io_uring.c:2281 [inline]
 io_submit_sqes+0x11db/0x1e60 io_uring/io_uring.c:2397
 __do_sys_io_uring_enter+0xc1d/0x2540 io_uring/io_uring.c:3345
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Last potentially related work creation:
 kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:488
 task_work_add+0x7f/0x2c0 kernel/task_work.c:48
 io_queue_worker_create+0x41d/0x660 io_uring/io-wq.c:373
 io_wqe_dec_running+0x1e4/0x240 io_uring/io-wq.c:410
 io_wq_worker_sleeping+0xa6/0xc0 io_uring/io-wq.c:698
 sched_submit_work kernel/sched/core.c:6597 [inline]
 schedule+0x16e/0x1b0 kernel/sched/core.c:6628
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6690
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0xa48/0x1360 kernel/locking/mutex.c:747
 io_ring_submit_lock io_uring/io_uring.h:215 [inline]
 io_file_get_fixed io_uring/io_uring.c:1966 [inline]
 io_assign_file io_uring/io_uring.c:1834 [inline]
 io_assign_file io_uring/io_uring.c:1828 [inline]
 io_wq_submit_work+0x5f7/0xdc0 io_uring/io_uring.c:1916
 io_worker_handle_work+0xc41/0x1c60 io_uring/io-wq.c:587
 io_wqe_worker+0xa5b/0xe40 io_uring/io-wq.c:632
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

The buggy address belongs to the object at ffff88807ba8f000
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 32 bytes inside of
 512-byte region [ffff88807ba8f000, ffff88807ba8f200)

The buggy address belongs to the physical page:
page:ffffea0001eea300 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7ba8c
head:ffffea0001eea300 order:2 compound_mapcount:0 subpages_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffff888012441c80 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 10143, tgid 10077 (syz-executor429), ts 196666481357, free_ts 195660604482
 prep_new_page mm/page_alloc.c:2531 [inline]
 get_page_from_freelist+0x119c/0x2ce0 mm/page_alloc.c:4283
 __alloc_pages+0x1cb/0x5b0 mm/page_alloc.c:5549
 __alloc_pages_node include/linux/gfp.h:237 [inline]
 alloc_slab_page mm/slub.c:1853 [inline]
 allocate_slab+0xa7/0x350 mm/slub.c:1998
 new_slab mm/slub.c:2051 [inline]
 ___slab_alloc+0xa91/0x1400 mm/slub.c:3193
 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3292
 __slab_alloc_node mm/slub.c:3345 [inline]
 slab_alloc_node mm/slub.c:3442 [inline]
 __kmem_cache_alloc_node+0x1a4/0x430 mm/slub.c:3491
 kmalloc_node_trace+0x21/0x60 mm/slab_common.c:1075
 kmalloc_node include/linux/slab.h:606 [inline]
 kzalloc_node include/linux/slab.h:731 [inline]
 create_io_worker+0x10c/0x630 io_uring/io-wq.c:801
 io_wqe_create_worker io_uring/io-wq.c:310 [inline]
 io_wqe_enqueue+0x6c3/0xbc0 io_uring/io-wq.c:936
 io_queue_iowq+0x282/0x5c0 io_uring/io_uring.c:475
 io_queue_sqe_fallback+0xf3/0x190 io_uring/io_uring.c:2059
 io_submit_sqe io_uring/io_uring.c:2281 [inline]
 io_submit_sqes+0x11db/0x1e60 io_uring/io_uring.c:2397
 __do_sys_io_uring_enter+0xc1d/0x2540 io_uring/io_uring.c:3345
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 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:1446 [inline]
 free_pcp_prepare+0x65c/0xc00 mm/page_alloc.c:1496
 free_unref_page_prepare mm/page_alloc.c:3369 [inline]
 free_unref_page+0x1d/0x490 mm/page_alloc.c:3464
 __unfreeze_partials+0x17c/0x1a0 mm/slub.c:2637
 qlink_free mm/kasan/quarantine.c:168 [inline]
 qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187
 kasan_quarantine_reduce+0x192/0x220 mm/kasan/quarantine.c:294
 __kasan_slab_alloc+0x66/0x90 mm/kasan/common.c:302
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook mm/slab.h:761 [inline]
 slab_alloc_node mm/slub.c:3452 [inline]
 slab_alloc mm/slub.c:3460 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3467 [inline]
 kmem_cache_alloc+0x1e4/0x430 mm/slub.c:3476
 kmem_cache_zalloc include/linux/slab.h:710 [inline]
 taskstats_tgid_alloc kernel/taskstats.c:583 [inline]
 taskstats_exit+0x5f3/0xb80 kernel/taskstats.c:622
 do_exit+0x822/0x2950 kernel/exit.c:852
 do_group_exit+0xd4/0x2a0 kernel/exit.c:1012
 __do_sys_exit_group kernel/exit.c:1023 [inline]
 __se_sys_exit_group kernel/exit.c:1021 [inline]
 __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1021
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Memory state around the buggy address:
 ffff88807ba8ef00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88807ba8ef80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88807ba8f000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                               ^
 ffff88807ba8f080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88807ba8f100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/01/08 16:39 upstream 9b43a525db12 1dac8c7a .config console log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce KASAN: use-after-free Read in io_wqe_worker
2023/01/10 05:44 upstream 5a41237ad1d4 1dac8c7a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root KASAN: use-after-free Read in io_wqe_worker
2023/01/08 13:46 upstream 9b43a525db12 1dac8c7a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce KASAN: use-after-free Read in io_wqe_worker
* Struck through repros no longer work on HEAD.