[syzbot] [acpi?] KASAN: slab-use-after-free Read in software_node_notify_remove

syzbot
2025-04-06T11:37:29Z

Hello,

syzbot found the following issue on:

HEAD commit: acc4d5ff0b61 Merge tag 'net-6.15-rc0' of git://git.kernel...
git tree: upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=15a807cf980000
kernel config: https://syzkaller.appspot.com/x/.config?x=24f9c4330e7c0609
dashboard link: https://syzkaller.appspot.com/bug?extid=2ff22910687ee0dfd48e
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=109077b0580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13717c3f980000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/e4bfa652b34a/disk-acc4d5ff.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/3d19beb8bb92/vmlinux-acc4d5ff.xz
kernel image: https://storage.googleapis.com/syzbot-assets/e7298ccc6331/bzImage-acc4d5ff.xz

The issue was bisected to:

commit 9eb59204d5197b4add63968c8c5b7633631f9a5a
Author: Yi Liu <yi.l.liu@intel.com>
Date: Fri Mar 21 17:19:37 2025 +0000

iommufd/selftest: Add set_dev_pasid in mock iommu

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=160ec7cf980000
final oops: https://syzkaller.appspot.com/x/report.txt?x=150ec7cf980000
console output: https://syzkaller.appspot.com/x/log.txt?x=110ec7cf980000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+2ff22910687ee0dfd48e@syzkaller.appspotmail.com
Fixes: 9eb59204d519 ("iommufd/selftest: Add set_dev_pasid in mock iommu")

R10: 0000000000000002 R11: 0000000000000246 R12: 00007ffcce8ad2dc
R13: 431bde82d7b634db R14: 0000000000000001 R15: 0000000000000001
</TASK>
iommufd_mock iommufd_mock0: Adding to iommu group 0
==================================================================
BUG: KASAN: slab-use-after-free in software_node_notify_remove+0x1bc/0x1c0 drivers/base/swnode.c:1108
Read of size 1 at addr ffff88807fe41108 by task syz-executor390/5849

CPU: 1 UID: 0 PID: 5849 Comm: syz-executor390 Not tainted 6.14.0-syzkaller-12456-gacc4d5ff0b61 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:408 [inline]
print_report+0x16e/0x5b0 mm/kasan/report.c:521
kasan_report+0x143/0x180 mm/kasan/report.c:634
software_node_notify_remove+0x1bc/0x1c0 drivers/base/swnode.c:1108
device_platform_notify_remove drivers/base/core.c:2387 [inline]
device_del+0x594/0x9b0 drivers/base/core.c:3858
device_unregister+0x20/0xc0 drivers/base/core.c:3896
mock_dev_destroy drivers/iommu/iommufd/selftest.c:960 [inline]
iommufd_test_mock_domain drivers/iommu/iommufd/selftest.c:1022 [inline]
iommufd_test+0x3715/0x56a0 drivers/iommu/iommufd/selftest.c:1866
iommufd_fops_ioctl+0x4fc/0x610 drivers/iommu/iommufd/main.c:419
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:906 [inline]
__se_sys_ioctl+0xf1/0x160 fs/ioctl.c:892
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7feea50b36e9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 a1 1a 00 00 90 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:00007ffcce8ad2c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ffcce8ad2e0 RCX: 00007feea50b36e9
RDX: 0000200000000200 RSI: 0000000000003ba0 RDI: 0000000000000003
RBP: 0000000000000002 R08: 00007ffcce8ad066 R09: 00000000000000a0
R10: 0000000000000002 R11: 0000000000000246 R12: 00007ffcce8ad2dc
R13: 431bde82d7b634db R14: 0000000000000001 R15: 0000000000000001
</TASK>

Allocated by task 5849:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
__kasan_kmalloc+0x9d/0xb0 mm/kasan/common.c:394
kasan_kmalloc include/linux/kasan.h:260 [inline]
__kmalloc_cache_noprof+0x236/0x370 mm/slub.c:4362
kmalloc_noprof include/linux/slab.h:905 [inline]
kzalloc_noprof include/linux/slab.h:1039 [inline]
swnode_register+0x5a/0x540 drivers/base/swnode.c:790
fwnode_create_software_node+0x199/0x1f0 drivers/base/swnode.c:949
device_create_managed_software_node+0xd5/0x1f0 drivers/base/swnode.c:1060
mock_dev_create drivers/iommu/iommufd/selftest.c:942 [inline]
iommufd_test_mock_domain drivers/iommu/iommufd/selftest.c:989 [inline]
iommufd_test+0x3335/0x56a0 drivers/iommu/iommufd/selftest.c:1866
iommufd_fops_ioctl+0x4fc/0x610 drivers/iommu/iommufd/main.c:419
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:906 [inline]
__se_sys_ioctl+0xf1/0x160 fs/ioctl.c:892
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 5849:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:576
poison_slab_object mm/kasan/common.c:247 [inline]
__kasan_slab_free+0x59/0x70 mm/kasan/common.c:264
kasan_slab_free include/linux/kasan.h:233 [inline]
slab_free_hook mm/slub.c:2389 [inline]
slab_free mm/slub.c:4646 [inline]
kfree+0x198/0x430 mm/slub.c:4845
kobject_cleanup lib/kobject.c:689 [inline]
kobject_release lib/kobject.c:720 [inline]
kref_put include/linux/kref.h:65 [inline]
kobject_put+0x22f/0x480 lib/kobject.c:737
software_node_notify_remove+0x159/0x1c0 drivers/base/swnode.c:1106
device_platform_notify_remove drivers/base/core.c:2387 [inline]
device_del+0x594/0x9b0 drivers/base/core.c:3858
device_unregister+0x20/0xc0 drivers/base/core.c:3896
mock_dev_destroy drivers/iommu/iommufd/selftest.c:960 [inline]
iommufd_test_mock_domain drivers/iommu/iommufd/selftest.c:1022 [inline]
iommufd_test+0x3715/0x56a0 drivers/iommu/iommufd/selftest.c:1866
iommufd_fops_ioctl+0x4fc/0x610 drivers/iommu/iommufd/main.c:419
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:906 [inline]
__se_sys_ioctl+0xf1/0x160 fs/ioctl.c:892
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff88807fe41000
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 264 bytes inside of
freed 512-byte region [ffff88807fe41000, ffff88807fe41200)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7fe40
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
anon flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801b041c80 0000000000000000 dead000000000001
raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88801b041c80 0000000000000000 dead000000000001
head: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffea0001ff9001 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004
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 5226, tgid 5226 (udevd), ts 58838564258, free_ts 55546510086
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1f4/0x240 mm/page_alloc.c:1717
prep_new_page mm/page_alloc.c:1725 [inline]
get_page_from_freelist+0x352b/0x36c0 mm/page_alloc.c:3652
__alloc_frozen_pages_noprof+0x211/0x5b0 mm/page_alloc.c:4934
alloc_pages_mpol+0x339/0x690 mm/mempolicy.c:2301
alloc_slab_page mm/slub.c:2459 [inline]
allocate_slab+0x8f/0x3a0 mm/slub.c:2623
new_slab mm/slub.c:2676 [inline]
___slab_alloc+0xc3b/0x1500 mm/slub.c:3862
__slab_alloc+0x58/0xa0 mm/slub.c:3952
__slab_alloc_node mm/slub.c:4027 [inline]
slab_alloc_node mm/slub.c:4188 [inline]
__kmalloc_cache_noprof+0x26a/0x370 mm/slub.c:4357
kmalloc_noprof include/linux/slab.h:905 [inline]
kzalloc_noprof include/linux/slab.h:1039 [inline]
kernfs_fop_open+0x3a3/0xdf0 fs/kernfs/file.c:623
do_dentry_open+0xdec/0x1960 fs/open.c:956
vfs_open+0x3b/0x370 fs/open.c:1086
do_open fs/namei.c:3845 [inline]
path_openat+0x2caf/0x35d0 fs/namei.c:4004
do_filp_open+0x284/0x4e0 fs/namei.c:4031
do_sys_openat2+0x12b/0x1d0 fs/open.c:1429
do_sys_open fs/open.c:1444 [inline]
__do_sys_openat fs/open.c:1460 [inline]
__se_sys_openat fs/open.c:1455 [inline]
__x64_sys_openat+0x249/0x2a0 fs/open.c:1455
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
page last free pid 5223 tgid 5223 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1262 [inline]
__free_frozen_pages+0xde8/0x10a0 mm/page_alloc.c:2680
mm_free_pgd kernel/fork.c:793 [inline]
__mmdrop+0xb9/0x490 kernel/fork.c:939
mmdrop include/linux/sched/mm.h:55 [inline]
mmdrop_sched include/linux/sched/mm.h:83 [inline]
mmdrop_lazy_tlb_sched include/linux/sched/mm.h:110 [inline]
finish_task_switch+0x304/0x870 kernel/sched/core.c:5275
context_switch kernel/sched/core.c:5385 [inline]
__schedule+0x1b90/0x5240 kernel/sched/core.c:6767
__schedule_loop kernel/sched/core.c:6845 [inline]
schedule+0x163/0x360 kernel/sched/core.c:6860
schedule_hrtimeout_range_clock+0x193/0x360 kernel/time/sleep_timeout.c:216
ep_poll fs/eventpoll.c:2107 [inline]
do_epoll_wait+0xe2c/0x1100 fs/eventpoll.c:2523
__do_sys_epoll_wait fs/eventpoll.c:2531 [inline]
__se_sys_epoll_wait fs/eventpoll.c:2526 [inline]
__x64_sys_epoll_wait+0x259/0x2b0 fs/eventpoll.c:2526
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
ffff88807fe41000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88807fe41080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88807fe41100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88807fe41180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88807fe41200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================

---
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