[moderation] [bpf?] [trace?] KASAN: slab-use-after-free Read in bpf_trace_run4 (2)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: b29fb8829bff Merge tag 'v7.0-rc3-ksmbd-server-fixes' of gi..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12ab575a580000
kernel config: https://syzkaller.appspot.com/x/.config?x=c5c49ee0942d1cdb
dashboard link: https://syzkaller.appspot.com/bug?extid=495478e90276756f5fef
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
CC: [and...@kernel.org a...@kernel.org b...@vger.kernel.org dan...@iogearbox.net edd...@gmail.com hao...@google.com john.fa...@gmail.com jo...@kernel.org kps...@kernel.org linux-...@vger.kernel.org linux-tra...@vger.kernel.org marti...@linux.dev mathieu....@efficios.com mattbo...@google.com mhir...@kernel.org ros...@goodmis.org s...@fomichev.me so...@kernel.org yongho...@linux.dev]

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-b29fb882.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/4fd392c86ab5/vmlinux-b29fb882.xz
kernel image: https://storage.googleapis.com/syzbot-assets/32f95fb6f35f/bzImage-b29fb882.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+495478...@syzkaller.appspotmail.com

==================================================================
BUG: KASAN: slab-use-after-free in __bpf_trace_run kernel/trace/bpf_trace.c:2075 [inline]
BUG: KASAN: slab-use-after-free in bpf_trace_run4+0xe6/0x850 kernel/trace/bpf_trace.c:2131
Read of size 8 at addr ffff8880361a0318 by task udevd/5299

CPU: 0 UID: 0 PID: 5299 Comm: udevd Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Call Trace:
<TASK>
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:378 [inline]
print_report+0xba/0x230 mm/kasan/report.c:482
kasan_report+0x117/0x150 mm/kasan/report.c:595
__bpf_trace_run kernel/trace/bpf_trace.c:2075 [inline]
bpf_trace_run4+0xe6/0x850 kernel/trace/bpf_trace.c:2131
__traceiter_mm_page_alloc+0x3d/0x60 include/trace/events/kmem.h:180
__do_trace_mm_page_alloc include/trace/events/kmem.h:180 [inline]
trace_mm_page_alloc+0x149/0x180 include/trace/events/kmem.h:180
__alloc_frozen_pages_noprof+0x1de/0x380 mm/page_alloc.c:5272
alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2484
folio_alloc_mpol_noprof+0x39/0x70 mm/mempolicy.c:2503
swap_cache_alloc_folio+0xd5/0x240 mm/swap_state.c:571
swap_cluster_readahead+0x369/0x690 mm/swap_state.c:749
swapin_readahead+0x196/0xc50 mm/swap_state.c:924
do_swap_page+0x56f/0x5a20 mm/memory.c:4802
handle_pte_fault mm/memory.c:6320 [inline]
__handle_mm_fault mm/memory.c:6455 [inline]
handle_mm_fault+0x12d2/0x3310 mm/memory.c:6624
do_user_addr_fault+0xa73/0x1340 arch/x86/mm/fault.c:1334
handle_page_fault arch/x86/mm/fault.c:1474 [inline]
exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1527
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x55f04dab55f0
Code: c0 0f 85 0e 19 00 00 4c 8b 73 18 c7 44 24 28 00 00 00 00 49 89 dc 4c 8d 3d e9 95 02 00 4c 89 34 24 66 0f 1f 84 00 00 00 00 00 <41> 0f b6 1e 80 fb 35 0f 87 e3 01 00 00 0f b6 c3 49 63 04 87 4c 01
RSP: 002b:00007fff48a349c0 EFLAGS: 00010206
RAX: 000055f051ea3770 RBX: 0000000000000034 RCX: 0000000000000063
RDX: 0000000000000381 RSI: 000055f051eb5b50 RDI: 000055f051ecfdae
RBP: 000055f052096b80 R08: 000055f04daf2100 R09: 000055f04daf2140
R10: 0000000000000000 R11: 0000000000000000 R12: 000055f051eb5270
R13: 000055f051eb02c0 R14: 000055f051ea4574 R15: 000055f04dadebcc
</TASK>

Allocated by task 5326:
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
__kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415
kasan_kmalloc include/linux/kasan.h:263 [inline]
__kmalloc_cache_noprof+0x31c/0x660 mm/slub.c:5383
kmalloc_noprof include/linux/slab.h:950 [inline]
kzalloc_noprof include/linux/slab.h:1188 [inline]
bpf_raw_tp_link_attach+0x278/0x700 kernel/bpf/syscall.c:4264
bpf_raw_tracepoint_open+0x1b2/0x220 kernel/bpf/syscall.c:4312
__sys_bpf+0x846/0x950 kernel/bpf/syscall.c:6270
__do_sys_bpf kernel/bpf/syscall.c:6341 [inline]
__se_sys_bpf kernel/bpf/syscall.c:6339 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6339
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 15:
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584
poison_slab_object mm/kasan/common.c:253 [inline]
__kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:2692 [inline]
slab_free mm/slub.c:6168 [inline]
kfree+0x1c1/0x630 mm/slub.c:6486
rcu_do_batch kernel/rcu/tree.c:2617 [inline]
rcu_core+0x7cd/0x1070 kernel/rcu/tree.c:2869
handle_softirqs+0x22a/0x870 kernel/softirq.c:622
run_ksoftirqd+0x36/0x60 kernel/softirq.c:1063
smpboot_thread_fn+0x541/0xa50 kernel/smpboot.c:160
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Last potentially related work creation:
kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57
kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556
__call_rcu_common kernel/rcu/tree.c:3131 [inline]
call_rcu+0xee/0x890 kernel/rcu/tree.c:3251
bpf_link_put_direct kernel/bpf/syscall.c:3323 [inline]
bpf_link_release+0x6b/0x80 kernel/bpf/syscall.c:3330
__fput+0x44f/0xa70 fs/file_table.c:469
task_work_run+0x1d9/0x270 kernel/task_work.c:233
exit_task_work include/linux/task_work.h:40 [inline]
do_exit+0x70f/0x23c0 kernel/exit.c:976
do_group_exit+0x21b/0x2d0 kernel/exit.c:1118
get_signal+0x1284/0x1330 kernel/signal.c:3034
arch_do_signal_or_restart+0xbc/0x830 arch/x86/kernel/signal.c:337
__exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
exit_to_user_mode_loop kernel/entry/common.c:98 [inline]
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:270 [inline]
irqentry_exit_to_user_mode include/linux/irq-entry-common.h:339 [inline]
irqentry_exit+0x176/0x620 kernel/entry/common.c:219
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618

The buggy address belongs to the object at ffff8880361a0300
which belongs to the cache kmalloc-192 of size 192
The buggy address is located 24 bytes inside of
freed 192-byte region [ffff8880361a0300, ffff8880361a03c0)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff8880361a0400 pfn:0x361a0
flags: 0x4fff00000000200(workingset|node=1|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 04fff00000000200 ffff88801ac413c0 ffffea0000d7ce90 ffffea0000e14e90
raw: ffff8880361a0400 000000080010000f 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0xd2cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 922, tgid 922 (kworker/0:3), ts 22003490640, free_ts 22003061349
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x231/0x280 mm/page_alloc.c:1889
prep_new_page mm/page_alloc.c:1897 [inline]
get_page_from_freelist+0x24dc/0x2580 mm/page_alloc.c:3962
__alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5250
alloc_slab_page mm/slub.c:3296 [inline]
allocate_slab+0x77/0x660 mm/slub.c:3485
new_slab mm/slub.c:3543 [inline]
refill_objects+0x331/0x3c0 mm/slub.c:7178
__pcs_replace_empty_main+0x2f9/0x5e0 mm/slub.c:-1
alloc_from_pcs mm/slub.c:4720 [inline]
slab_alloc_node mm/slub.c:4854 [inline]
__do_kmalloc_node mm/slub.c:5262 [inline]
__kmalloc_noprof+0x474/0x760 mm/slub.c:5275
kmalloc_noprof include/linux/slab.h:954 [inline]
virtio_gpu_array_alloc+0x26/0xc0 drivers/gpu/drm/virtio/virtgpu_gem.c:170
virtio_gpu_update_dumb_bo drivers/gpu/drm/virtio/virtgpu_plane.c:171 [inline]
virtio_gpu_primary_plane_update+0x38d/0x13a0 drivers/gpu/drm/virtio/virtgpu_plane.c:265
drm_atomic_helper_commit_planes+0x60f/0xec0 drivers/gpu/drm/drm_atomic_helper.c:3038
drm_atomic_helper_commit_tail+0x5f/0x500 drivers/gpu/drm/drm_atomic_helper.c:1989
commit_tail+0x29a/0x3a0 drivers/gpu/drm/drm_atomic_helper.c:2074
drm_atomic_helper_commit+0xa6e/0xb10 drivers/gpu/drm/drm_atomic_helper.c:2312
drm_atomic_commit+0x246/0x2b0 drivers/gpu/drm/drm_atomic.c:1775
drm_atomic_helper_dirtyfb+0xdec/0xf80 drivers/gpu/drm/drm_damage_helper.c:183
drm_fbdev_shmem_helper_fb_dirty+0x160/0x2d0 drivers/gpu/drm/drm_fbdev_shmem.c:117
page last free pid 70 tgid 70 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
__free_pages_prepare mm/page_alloc.c:1433 [inline]
__free_frozen_pages+0xc2b/0xdb0 mm/page_alloc.c:2978
___free_pages_bulk mm/kasan/shadow.c:333 [inline]
__kasan_populate_vmalloc_do mm/kasan/shadow.c:385 [inline]
__kasan_populate_vmalloc+0x137/0x1d0 mm/kasan/shadow.c:424
kasan_populate_vmalloc include/linux/kasan.h:580 [inline]
alloc_vmap_area+0xd73/0x14b0 mm/vmalloc.c:2129
__get_vm_area_node+0x1f8/0x300 mm/vmalloc.c:3232
__vmalloc_node_range_noprof+0x372/0x1730 mm/vmalloc.c:4024
__vmalloc_node_noprof+0xc2/0x100 mm/vmalloc.c:4124
alloc_thread_stack_node kernel/fork.c:355 [inline]
dup_task_struct+0x228/0x9a0 kernel/fork.c:924
copy_process+0x508/0x3cf0 kernel/fork.c:2050
kernel_clone+0x248/0x8e0 kernel/fork.c:2654
user_mode_thread+0x110/0x180 kernel/fork.c:2730
call_usermodehelper_exec_work+0x5c/0x230 kernel/umh.c:171
process_one_work kernel/workqueue.c:3275 [inline]
process_scheduled_works+0xb02/0x1830 kernel/workqueue.c:3358
worker_thread+0xa50/0xfc0 kernel/workqueue.c:3439
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Memory state around the buggy address:
ffff8880361a0200: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880361a0280: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff8880361a0300: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8880361a0380: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff8880361a0400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================


---
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