* Re: [syzbot] KASAN: use-after-free Read in task_work_run (2)
[not found] <000000000000fad77705e7fd40fb@google.com>
@ 2022-09-06 7:44 ` Dmitry Vyukov
2022-10-26 18:29 ` syzbot
1 sibling, 0 replies; 2+ messages in thread
From: Dmitry Vyukov @ 2022-09-06 7:44 UTC (permalink / raw)
To: syzbot, Sumit Semwal, christian.koenig, Linux Media Mailing List,
DRI, linaro-mm-sig
Cc: asml.silence, axboe, ebiederm, keescook, linux-kernel,
syzkaller-bugs
On Tue, 6 Sept 2022 at 09:36, syzbot
<syzbot+9228d6098455bb209ec8@syzkaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: c5e4d5e99162 Merge tag 'fscache-fixes-20220831' of git://g..
> git tree: upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=142e0e1b080000
> kernel config: https://syzkaller.appspot.com/x/.config?x=9c5c41fc03fda66f
> dashboard link: https://syzkaller.appspot.com/bug?extid=9228d6098455bb209ec8
> compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2
>
> Unfortunately, I don't have any reproducer for this issue yet.
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+9228d6098455bb209ec8@syzkaller.appspotmail.com
Looks like the issue is in dma-buf.c
+dma-buf.c maintainers
> ==================================================================
> BUG: KASAN: use-after-free in task_work_run+0x126/0x1c0 kernel/task_work.c:176
> Read of size 8 at addr ffff88801d1fe500 by task syz-executor.2/18582
>
> CPU: 0 PID: 18582 Comm: syz-executor.2 Not tainted 6.0.0-rc3-syzkaller-00031-gc5e4d5e99162 #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
> Call Trace:
> <TASK>
> __dump_stack lib/dump_stack.c:88 [inline]
> dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
> print_address_description+0x65/0x4b0 mm/kasan/report.c:317
> print_report+0x108/0x220 mm/kasan/report.c:433
> kasan_report+0xfb/0x130 mm/kasan/report.c:495
> task_work_run+0x126/0x1c0 kernel/task_work.c:176
> resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
> exit_to_user_mode_loop+0x134/0x160 kernel/entry/common.c:169
> exit_to_user_mode_prepare+0xad/0x110 kernel/entry/common.c:201
> __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline]
> syscall_exit_to_user_mode+0x2e/0x60 kernel/entry/common.c:294
> entry_SYSCALL_64_after_hwframe+0x63/0xcd
> RIP: 0033:0x7f287f289279
> Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
> RSP: 002b:00007f28804cd168 EFLAGS: 00000246 ORIG_RAX: 0000000000000119
> RAX: 0000000000000001 RBX: 00007f287f39bf80 RCX: 00007f287f289279
> RDX: 0000000000000001 RSI: 0000000020000000 RDI: 0000000000000003
> RBP: 00007f287f2e32e9 R08: 0000000000000000 R09: 0000000000000000
> R10: 00000000000006ff R11: 0000000000000246 R12: 0000000000000000
> R13: 00007ffd34f4ba0f R14: 00007f28804cd300 R15: 0000000000022000
> </TASK>
>
> Allocated by task 18586:
> kasan_save_stack mm/kasan/common.c:38 [inline]
> kasan_set_track mm/kasan/common.c:45 [inline]
> set_alloc_info mm/kasan/common.c:437 [inline]
> __kasan_slab_alloc+0xb2/0xe0 mm/kasan/common.c:470
> kasan_slab_alloc include/linux/kasan.h:224 [inline]
> slab_post_alloc_hook mm/slab.h:727 [inline]
> slab_alloc_node mm/slub.c:3243 [inline]
> slab_alloc mm/slub.c:3251 [inline]
> __kmem_cache_alloc_lru mm/slub.c:3258 [inline]
> kmem_cache_alloc+0x1a6/0x310 mm/slub.c:3268
> kmem_cache_zalloc include/linux/slab.h:723 [inline]
> __alloc_file+0x26/0x230 fs/file_table.c:138
> alloc_empty_file+0xa9/0x1b0 fs/file_table.c:187
> alloc_file+0x58/0x5e0 fs/file_table.c:229
> alloc_file_pseudo+0x260/0x300 fs/file_table.c:272
> dma_buf_getfile drivers/dma-buf/dma-buf.c:534 [inline]
> dma_buf_export+0x634/0x920 drivers/dma-buf/dma-buf.c:652
> drm_gem_dmabuf_export drivers/gpu/drm/drm_prime.c:253 [inline]
> drm_gem_prime_export+0x255/0x400 drivers/gpu/drm/drm_prime.c:895
> export_and_register_object drivers/gpu/drm/drm_prime.c:397 [inline]
> drm_gem_prime_handle_to_fd+0x3e6/0x530 drivers/gpu/drm/drm_prime.c:465
> drm_ioctl_kernel+0x33e/0x4f0 drivers/gpu/drm/drm_ioctl.c:782
> drm_ioctl+0x626/0xa10 drivers/gpu/drm/drm_ioctl.c:885
> vfs_ioctl fs/ioctl.c:51 [inline]
> __do_sys_ioctl fs/ioctl.c:870 [inline]
> __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:856
> do_syscall_x64 arch/x86/entry/common.c:50 [inline]
> do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
> entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> Freed by task 18595:
> kasan_save_stack mm/kasan/common.c:38 [inline]
> kasan_set_track+0x4c/0x70 mm/kasan/common.c:45
> kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:370
> ____kasan_slab_free+0xd8/0x120 mm/kasan/common.c:367
> kasan_slab_free include/linux/kasan.h:200 [inline]
> slab_free_hook mm/slub.c:1754 [inline]
> slab_free_freelist_hook+0x12e/0x1a0 mm/slub.c:1780
> slab_free mm/slub.c:3534 [inline]
> kmem_cache_free+0x95/0x1d0 mm/slub.c:3551
> rcu_do_batch kernel/rcu/tree.c:2245 [inline]
> rcu_core+0xa61/0x1710 kernel/rcu/tree.c:2505
> __do_softirq+0x382/0x793 kernel/softirq.c:571
>
> Last potentially related work creation:
> kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38
> __kasan_record_aux_stack+0xaf/0xc0 mm/kasan/generic.c:348
> call_rcu+0x163/0x9c0 kernel/rcu/tree.c:2793
> task_work_run+0x146/0x1c0 kernel/task_work.c:177
> resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
> exit_to_user_mode_loop+0x134/0x160 kernel/entry/common.c:169
> exit_to_user_mode_prepare+0xad/0x110 kernel/entry/common.c:201
> __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline]
> syscall_exit_to_user_mode+0x2e/0x60 kernel/entry/common.c:294
> entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> Second to last potentially related work creation:
> kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38
> __kasan_record_aux_stack+0xaf/0xc0 mm/kasan/generic.c:348
> task_work_add+0x2f/0x200 kernel/task_work.c:48
> fput+0xdc/0x1a0 fs/file_table.c:381
> dma_buf_poll_cb drivers/dma-buf/dma-buf.c:213 [inline]
> dma_buf_poll+0x53a/0x680 drivers/dma-buf/dma-buf.c:295
> vfs_poll include/linux/poll.h:88 [inline]
> ep_item_poll fs/eventpoll.c:853 [inline]
> ep_send_events fs/eventpoll.c:1692 [inline]
> ep_poll+0xb27/0x1e60 fs/eventpoll.c:1821
> do_epoll_wait+0x1a2/0x210 fs/eventpoll.c:2256
> do_epoll_pwait fs/eventpoll.c:2290 [inline]
> __do_sys_epoll_pwait fs/eventpoll.c:2303 [inline]
> __se_sys_epoll_pwait+0x28e/0x480 fs/eventpoll.c:2297
> do_syscall_x64 arch/x86/entry/common.c:50 [inline]
> do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
> entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> The buggy address belongs to the object at ffff88801d1fe500
> which belongs to the cache filp of size 456
> The buggy address is located 0 bytes inside of
> 456-byte region [ffff88801d1fe500, ffff88801d1fe6c8)
>
> The buggy address belongs to the physical page:
> page:ffffea0000747f80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1d1fe
> head:ffffea0000747f80 order:1 compound_mapcount:0 compound_pincount:0
> memcg:ffff888072449c01
> flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
> raw: 00fff00000010200 ffffea00005ddf80 dead000000000002 ffff888140007a00
> raw: 0000000000000000 00000000000c000c 00000001ffffffff ffff888072449c01
> page dumped because: kasan: bad access detected
> page_owner tracks the page as allocated
> page last allocated via order 1, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 3111, tgid 3111 (v4l_id), ts 20130623440, free_ts 19733718234
> prep_new_page mm/page_alloc.c:2532 [inline]
> get_page_from_freelist+0x72b/0x7a0 mm/page_alloc.c:4283
> __alloc_pages+0x259/0x560 mm/page_alloc.c:5515
> alloc_slab_page+0x70/0xf0 mm/slub.c:1824
> allocate_slab+0x5e/0x520 mm/slub.c:1969
> new_slab mm/slub.c:2029 [inline]
> ___slab_alloc+0x42e/0xce0 mm/slub.c:3031
> __slab_alloc mm/slub.c:3118 [inline]
> slab_alloc_node mm/slub.c:3209 [inline]
> slab_alloc mm/slub.c:3251 [inline]
> __kmem_cache_alloc_lru mm/slub.c:3258 [inline]
> kmem_cache_alloc+0x25d/0x310 mm/slub.c:3268
> kmem_cache_zalloc include/linux/slab.h:723 [inline]
> __alloc_file+0x26/0x230 fs/file_table.c:138
> alloc_empty_file+0xa9/0x1b0 fs/file_table.c:187
> path_openat+0xf1/0x2e00 fs/namei.c:3677
> do_filp_open+0x275/0x500 fs/namei.c:3718
> do_sys_openat2+0x13b/0x500 fs/open.c:1311
> do_sys_open fs/open.c:1327 [inline]
> __do_sys_openat fs/open.c:1343 [inline]
> __se_sys_openat fs/open.c:1338 [inline]
> __x64_sys_openat+0x243/0x290 fs/open.c:1338
> do_syscall_x64 arch/x86/entry/common.c:50 [inline]
> do_syscall_64+0x2b/0x70 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:1449 [inline]
> free_pcp_prepare+0x812/0x900 mm/page_alloc.c:1499
> free_unref_page_prepare mm/page_alloc.c:3380 [inline]
> free_unref_page+0x7d/0x630 mm/page_alloc.c:3476
> qlist_free_all+0x2b/0x70 mm/kasan/quarantine.c:187
> kasan_quarantine_reduce+0x169/0x180 mm/kasan/quarantine.c:294
> __kasan_slab_alloc+0x2f/0xe0 mm/kasan/common.c:447
> kasan_slab_alloc include/linux/kasan.h:224 [inline]
> slab_post_alloc_hook mm/slab.h:727 [inline]
> slab_alloc_node mm/slub.c:3243 [inline]
> slab_alloc mm/slub.c:3251 [inline]
> __kmem_cache_alloc_lru mm/slub.c:3258 [inline]
> kmem_cache_alloc+0x1a6/0x310 mm/slub.c:3268
> vm_area_alloc+0x20/0xe0 kernel/fork.c:459
> mmap_region+0xb4a/0x16f0 mm/mmap.c:1732
> do_mmap+0x7a7/0xdf0 mm/mmap.c:1540
> vm_mmap_pgoff+0x1e5/0x2f0 mm/util.c:552
> ksys_mmap_pgoff+0x48c/0x6d0 mm/mmap.c:1586
> do_syscall_x64 arch/x86/entry/common.c:50 [inline]
> do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
> entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> Memory state around the buggy address:
> ffff88801d1fe400: fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc
> ffff88801d1fe480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
> >ffff88801d1fe500: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> ^
> ffff88801d1fe580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> ffff88801d1fe600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> ==================================================================
>
>
> ---
> This report is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at syzkaller@googlegroups.com.
>
> syzbot will keep track of this issue. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
>
> --
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^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [syzbot] KASAN: use-after-free Read in task_work_run (2)
[not found] <000000000000fad77705e7fd40fb@google.com>
2022-09-06 7:44 ` [syzbot] KASAN: use-after-free Read in task_work_run (2) Dmitry Vyukov
@ 2022-10-26 18:29 ` syzbot
1 sibling, 0 replies; 2+ messages in thread
From: syzbot @ 2022-10-26 18:29 UTC (permalink / raw)
To: asml.silence, axboe, christian.koenig, dri-devel, dvyukov,
ebiederm, keescook, linaro-mm-sig, linux-kernel, linux-media,
luto, netdev, peterz, sumit.semwal, syzkaller-bugs, tglx
syzbot has found a reproducer for the following issue on:
HEAD commit: 88619e77b33d net: stmmac: rk3588: Allow multiple gmac cont..
git tree: bpf
console output: https://syzkaller.appspot.com/x/log.txt?x=1646d6f2880000
kernel config: https://syzkaller.appspot.com/x/.config?x=a66c6c673fb555e8
dashboard link: https://syzkaller.appspot.com/bug?extid=9228d6098455bb209ec8
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12bc425e880000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1126516e880000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/f8435d5c2c21/disk-88619e77.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/551d8a013e81/vmlinux-88619e77.xz
kernel image: https://storage.googleapis.com/syzbot-assets/7d3f5c29064d/bzImage-88619e77.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+9228d6098455bb209ec8@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: use-after-free in task_work_run+0x1b0/0x270 kernel/task_work.c:178
Read of size 8 at addr ffff8880752b1c18 by task syz-executor361/3766
CPU: 0 PID: 3766 Comm: syz-executor361 Not tainted 6.1.0-rc2-syzkaller-00073-g88619e77b33d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:284 [inline]
print_report+0x15e/0x45d mm/kasan/report.c:395
kasan_report+0xbb/0x1f0 mm/kasan/report.c:495
task_work_run+0x1b0/0x270 kernel/task_work.c:178
exit_task_work include/linux/task_work.h:38 [inline]
do_exit+0xb35/0x2a20 kernel/exit.c:820
do_group_exit+0xd0/0x2a0 kernel/exit.c:950
get_signal+0x21a1/0x2430 kernel/signal.c:2858
arch_do_signal_or_restart+0x82/0x2300 arch/x86/kernel/signal.c:869
exit_to_user_mode_loop kernel/entry/common.c:168 [inline]
exit_to_user_mode_prepare+0x15f/0x250 kernel/entry/common.c:203
__syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:296
do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fb9f674b089
Code: Unable to access opcode bytes at 0x7fb9f674b05f.
RSP: 002b:00007fb9f66fb318 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000001 RBX: 00007fb9f67da1a8 RCX: 00007fb9f674b089
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fb9f67da1ac
RBP: 00007fb9f67da1a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000003100000400
R13: 00007fff658570cf R14: 00007fb9f66fb400 R15: 0000000000022000
</TASK>
Allocated by task 3766:
kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45
kasan_set_track+0x21/0x30 mm/kasan/common.c:52
__kasan_slab_alloc+0x7e/0x80 mm/kasan/common.c:325
kasan_slab_alloc include/linux/kasan.h:201 [inline]
slab_post_alloc_hook mm/slab.h:737 [inline]
slab_alloc_node mm/slub.c:3398 [inline]
kmem_cache_alloc_node+0x2fc/0x400 mm/slub.c:3443
perf_event_alloc.part.0+0x69/0x3bc0 kernel/events/core.c:11625
perf_event_alloc kernel/events/core.c:12174 [inline]
__do_sys_perf_event_open+0x4ae/0x32d0 kernel/events/core.c:12272
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
Freed by task 0:
kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45
kasan_set_track+0x21/0x30 mm/kasan/common.c:52
kasan_save_free_info+0x2a/0x40 mm/kasan/generic.c:511
____kasan_slab_free mm/kasan/common.c:236 [inline]
____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200
kasan_slab_free include/linux/kasan.h:177 [inline]
slab_free_hook mm/slub.c:1724 [inline]
slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1750
slab_free mm/slub.c:3661 [inline]
kmem_cache_free+0xea/0x5b0 mm/slub.c:3683
rcu_do_batch kernel/rcu/tree.c:2250 [inline]
rcu_core+0x81f/0x1980 kernel/rcu/tree.c:2510
__do_softirq+0x1f7/0xad8 kernel/softirq.c:571
Last potentially related work creation:
kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45
__kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:481
call_rcu+0x99/0x820 kernel/rcu/tree.c:2798
put_event kernel/events/core.c:5095 [inline]
perf_event_release_kernel+0x6f2/0x940 kernel/events/core.c:5210
perf_release+0x33/0x40 kernel/events/core.c:5220
__fput+0x27c/0xa90 fs/file_table.c:320
task_work_run+0x16b/0x270 kernel/task_work.c:179
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop kernel/entry/common.c:171 [inline]
exit_to_user_mode_prepare+0x23c/0x250 kernel/entry/common.c:203
__syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:296
do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x63/0xcd
Second to last potentially related work creation:
kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45
__kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:481
task_work_add+0x7b/0x2c0 kernel/task_work.c:48
event_sched_out+0xe35/0x1190 kernel/events/core.c:2294
__perf_remove_from_context+0x87/0xc40 kernel/events/core.c:2359
event_function+0x29e/0x3e0 kernel/events/core.c:254
remote_function kernel/events/core.c:92 [inline]
remote_function+0x11e/0x1a0 kernel/events/core.c:72
__flush_smp_call_function_queue+0x205/0x9a0 kernel/smp.c:630
__sysvec_call_function_single+0xca/0x4d0 arch/x86/kernel/smp.c:248
sysvec_call_function_single+0x8e/0xc0 arch/x86/kernel/smp.c:243
asm_sysvec_call_function_single+0x16/0x20 arch/x86/include/asm/idtentry.h:657
The buggy address belongs to the object at ffff8880752b17c0
which belongs to the cache perf_event of size 1392
The buggy address is located 1112 bytes inside of
1392-byte region [ffff8880752b17c0, ffff8880752b1d30)
The buggy address belongs to the physical page:
page:ffffea0001d4ac00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x752b0
head:ffffea0001d4ac00 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 0000000000000000 dead000000000122 ffff8880118c23c0
raw: 0000000000000000 0000000080150015 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 3754, tgid 3753 (syz-executor361), ts 58662170660, free_ts 58383135648
prep_new_page mm/page_alloc.c:2538 [inline]
get_page_from_freelist+0x10b5/0x2d50 mm/page_alloc.c:4287
__alloc_pages+0x1c7/0x5a0 mm/page_alloc.c:5554
alloc_pages+0x1a6/0x270 mm/mempolicy.c:2285
alloc_slab_page mm/slub.c:1794 [inline]
allocate_slab+0x213/0x300 mm/slub.c:1939
new_slab mm/slub.c:1992 [inline]
___slab_alloc+0xa91/0x1400 mm/slub.c:3180
__slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3279
slab_alloc_node mm/slub.c:3364 [inline]
kmem_cache_alloc_node+0x189/0x400 mm/slub.c:3443
perf_event_alloc.part.0+0x69/0x3bc0 kernel/events/core.c:11625
perf_event_alloc kernel/events/core.c:12174 [inline]
__do_sys_perf_event_open+0x4ae/0x32d0 kernel/events/core.c:12272
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 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:1458 [inline]
free_pcp_prepare+0x65c/0xd90 mm/page_alloc.c:1508
free_unref_page_prepare mm/page_alloc.c:3386 [inline]
free_unref_page+0x19/0x4d0 mm/page_alloc.c:3482
__unfreeze_partials+0x17c/0x1a0 mm/slub.c:2586
qlink_free mm/kasan/quarantine.c:168 [inline]
qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187
kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:294
__kasan_slab_alloc+0x62/0x80 mm/kasan/common.c:302
kasan_slab_alloc include/linux/kasan.h:201 [inline]
slab_post_alloc_hook mm/slab.h:737 [inline]
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+0x2ac/0x3c0 mm/slub.c:3422
kmem_cache_zalloc include/linux/slab.h:702 [inline]
alloc_buffer_head+0x20/0x140 fs/buffer.c:2899
alloc_page_buffers+0x280/0x790 fs/buffer.c:829
create_empty_buffers+0x2c/0xf20 fs/buffer.c:1543
ext4_block_write_begin+0x10a7/0x15f0 fs/ext4/inode.c:1074
ext4_da_write_begin+0x44c/0xb50 fs/ext4/inode.c:3003
generic_perform_write+0x252/0x570 mm/filemap.c:3753
ext4_buffered_write_iter+0x15b/0x460 fs/ext4/file.c:285
ext4_file_write_iter+0x8b8/0x16e0 fs/ext4/file.c:700
__kernel_write_iter+0x25e/0x730 fs/read_write.c:517
Memory state around the buggy address:
ffff8880752b1b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880752b1b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880752b1c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8880752b1c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880752b1d00: fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc
==================================================================
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[not found] <000000000000fad77705e7fd40fb@google.com>
2022-09-06 7:44 ` [syzbot] KASAN: use-after-free Read in task_work_run (2) Dmitry Vyukov
2022-10-26 18:29 ` syzbot
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