[syzbot] [net?] KASAN: slab-use-after-free Read in ptp_read

From: syzbot
Date: Sun Oct 22 2023 - 14:37:56 EST

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Hello,

syzbot found the following issue on:

HEAD commit: 2dac75696c6d Add linux-next specific files for 20231018
git tree: linux-next
console+strace: https://syzkaller.appspot.com/x/log.txt?x=12543ee5680000
kernel config: https://syzkaller.appspot.com/x/.config?x=6f8545e1ef7a2b66
dashboard link: https://syzkaller.appspot.com/bug?extid=9704e6f099d952508943
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11136303680000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1753f619680000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/2375f16ed327/disk-2dac7569.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/c80aee6e2e6c/vmlinux-2dac7569.xz
kernel image: https://storage.googleapis.com/syzbot-assets/664dc23b738d/bzImage-2dac7569.xz

The issue was bisected to:

commit 8f5de6fb245326704f37d91780b9a10253a8a100
Author: Xabier Marquiegui <reibax@xxxxxxxxx>
Date: Wed Oct 11 22:39:55 2023 +0000

ptp: support multiple timestamp event readers

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=136f424d680000
final oops: https://syzkaller.appspot.com/x/report.txt?x=10ef424d680000
console output: https://syzkaller.appspot.com/x/log.txt?x=176f424d680000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+9704e6f099d952508943@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: 8f5de6fb2453 ("ptp: support multiple timestamp event readers")

==================================================================
BUG: KASAN: slab-use-after-free in queue_cnt drivers/ptp/ptp_private.h:89 [inline]
BUG: KASAN: slab-use-after-free in ptp_read+0x7c4/0x830 drivers/ptp/ptp_chardev.c:547
Read of size 4 at addr ffff88801af1d004 by task syz-executor341/5060

CPU: 0 PID: 5060 Comm: syz-executor341 Not tainted 6.6.0-rc6-next-20231018-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:364 [inline]
print_report+0xc4/0x620 mm/kasan/report.c:475
kasan_report+0xda/0x110 mm/kasan/report.c:588
queue_cnt drivers/ptp/ptp_private.h:89 [inline]
ptp_read+0x7c4/0x830 drivers/ptp/ptp_chardev.c:547
posix_clock_read+0x138/0x1b0 kernel/time/posix-clock.c:51
vfs_read+0x1ce/0x8f0 fs/read_write.c:468
ksys_read+0x12f/0x250 fs/read_write.c:613
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3f/0x110 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f79c5938c39
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 c1 17 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f79c58fb238 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007f79c59c2308 RCX: 00007f79c5938c39
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00007f79c59c2300 R08: 00007f79c58fb6c0 R09: 00007f79c58fb6c0
R10: 00007f79c58fb6c0 R11: 0000000000000246 R12: 7074702f7665642f
R13: 0000000000000000 R14: 00007ffca835e430 R15: 00007ffca835e518
</TASK>

Allocated by task 5060:
kasan_save_stack+0x33/0x50 mm/kasan/common.c:45
kasan_set_track+0x25/0x30 mm/kasan/common.c:52
____kasan_kmalloc mm/kasan/common.c:374 [inline]
__kasan_kmalloc+0xa2/0xb0 mm/kasan/common.c:383
kmalloc include/linux/slab.h:600 [inline]
kzalloc include/linux/slab.h:721 [inline]
ptp_open+0xe3/0x4f0 drivers/ptp/ptp_chardev.c:112
posix_clock_open+0x17e/0x240 kernel/time/posix-clock.c:134
chrdev_open+0x26d/0x6e0 fs/char_dev.c:414
do_dentry_open+0x8d4/0x18d0 fs/open.c:948
do_open fs/namei.c:3621 [inline]
path_openat+0x1d3b/0x2ce0 fs/namei.c:3778
do_filp_open+0x1de/0x430 fs/namei.c:3808
do_sys_openat2+0x176/0x1e0 fs/open.c:1440
do_sys_open fs/open.c:1455 [inline]
__do_sys_openat fs/open.c:1471 [inline]
__se_sys_openat fs/open.c:1466 [inline]
__x64_sys_openat+0x175/0x210 fs/open.c:1466
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3f/0x110 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x63/0x6b

Freed by task 5061:
kasan_save_stack+0x33/0x50 mm/kasan/common.c:45
kasan_set_track+0x25/0x30 mm/kasan/common.c:52
kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:522
____kasan_slab_free mm/kasan/common.c:236 [inline]
____kasan_slab_free+0x15b/0x1b0 mm/kasan/common.c:200
kasan_slab_free include/linux/kasan.h:164 [inline]
slab_free_hook mm/slub.c:1800 [inline]
slab_free_freelist_hook+0x114/0x1e0 mm/slub.c:1826
slab_free mm/slub.c:3809 [inline]
__kmem_cache_free+0xc0/0x180 mm/slub.c:3822
ptp_release+0x204/0x2b0 drivers/ptp/ptp_chardev.c:150
ptp_read+0xf6/0x830 drivers/ptp/ptp_chardev.c:589
posix_clock_read+0x138/0x1b0 kernel/time/posix-clock.c:51
vfs_read+0x1ce/0x8f0 fs/read_write.c:468
ksys_read+0x12f/0x250 fs/read_write.c:613
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3f/0x110 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x63/0x6b

The buggy address belongs to the object at ffff88801af1c000
which belongs to the cache kmalloc-8k of size 8192
The buggy address is located 4100 bytes inside of
freed 8192-byte region [ffff88801af1c000, ffff88801af1e000)

The buggy address belongs to the physical page:
page:ffffea00006bc600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1af18
head:ffffea00006bc600 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000840 ffff888012c42280 ffffea000067c800 0000000000000002
raw: 0000000000000000 0000000080020002 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 0xd2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 4710, tgid 4710 (rcS), ts 62110954256, free_ts 62079685567
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x2cf/0x340 mm/page_alloc.c:1537
prep_new_page mm/page_alloc.c:1544 [inline]
get_page_from_freelist+0xa16/0x3680 mm/page_alloc.c:3348
__alloc_pages+0x1d0/0x4c0 mm/page_alloc.c:4604
alloc_pages_mpol+0x258/0x5f0 mm/mempolicy.c:2133
alloc_slab_page mm/slub.c:1870 [inline]
allocate_slab+0x251/0x380 mm/slub.c:2017
new_slab mm/slub.c:2070 [inline]
___slab_alloc+0x8c7/0x1580 mm/slub.c:3223
__slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3322
__slab_alloc_node mm/slub.c:3375 [inline]
slab_alloc_node mm/slub.c:3468 [inline]
__kmem_cache_alloc_node+0x131/0x310 mm/slub.c:3517
kmalloc_trace+0x27/0xf0 mm/slab_common.c:1098
kmalloc include/linux/slab.h:600 [inline]
kzalloc include/linux/slab.h:721 [inline]
tomoyo_print_bprm security/tomoyo/audit.c:26 [inline]
tomoyo_init_log+0xcdf/0x2110 security/tomoyo/audit.c:264
tomoyo_supervisor+0x30c/0xea0 security/tomoyo/common.c:2089
tomoyo_audit_env_log security/tomoyo/environ.c:36 [inline]
tomoyo_env_perm+0x18f/0x200 security/tomoyo/environ.c:63
tomoyo_environ security/tomoyo/domain.c:672 [inline]
tomoyo_find_next_domain+0xef6/0x2020 security/tomoyo/domain.c:878
tomoyo_bprm_check_security security/tomoyo/tomoyo.c:101 [inline]
tomoyo_bprm_check_security+0x12b/0x1d0 security/tomoyo/tomoyo.c:91
security_bprm_check+0x6a/0xe0 security/security.c:1103
search_binary_handler fs/exec.c:1725 [inline]
exec_binprm fs/exec.c:1779 [inline]
bprm_execve fs/exec.c:1854 [inline]
bprm_execve+0x738/0x1a90 fs/exec.c:1810
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1137 [inline]
free_unref_page_prepare+0x476/0xa40 mm/page_alloc.c:2383
free_unref_page+0x33/0x3b0 mm/page_alloc.c:2523
__unfreeze_partials+0x21d/0x240 mm/slub.c:2655
qlink_free mm/kasan/quarantine.c:168 [inline]
qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187
kasan_quarantine_reduce+0x18e/0x1d0 mm/kasan/quarantine.c:294
__kasan_slab_alloc+0x65/0x90 mm/kasan/common.c:305
kasan_slab_alloc include/linux/kasan.h:188 [inline]
slab_post_alloc_hook mm/slab.h:763 [inline]
slab_alloc_node mm/slub.c:3478 [inline]
__kmem_cache_alloc_node+0x195/0x310 mm/slub.c:3517
kmalloc_trace+0x27/0xf0 mm/slab_common.c:1098
kmalloc include/linux/slab.h:600 [inline]
tomoyo_print_header security/tomoyo/audit.c:156 [inline]
tomoyo_init_log+0x1a0/0x2110 security/tomoyo/audit.c:255
tomoyo_supervisor+0x30c/0xea0 security/tomoyo/common.c:2089
tomoyo_audit_path_log security/tomoyo/file.c:168 [inline]
tomoyo_path_permission security/tomoyo/file.c:587 [inline]
tomoyo_path_permission+0x270/0x3b0 security/tomoyo/file.c:573
tomoyo_check_open_permission+0x371/0x3b0 security/tomoyo/file.c:777
tomoyo_file_open security/tomoyo/tomoyo.c:332 [inline]
tomoyo_file_open+0xa8/0xd0 security/tomoyo/tomoyo.c:327
security_file_open+0x6a/0xe0 security/security.c:2836
do_dentry_open+0x583/0x18d0 fs/open.c:935
do_open fs/namei.c:3621 [inline]
path_openat+0x1d3b/0x2ce0 fs/namei.c:3778

Memory state around the buggy address:
ffff88801af1cf00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88801af1cf80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88801af1d000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88801af1d080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88801af1d100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

---
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Next message: John Sanpe: "[PATCH] fs/smb: using crypto lib instead cifs_arc4"
Previous message: Jeff LaBundy: "Re: [PATCH 2/2] Input: add Himax HX852x(ES) touchscreen driver"
Next in thread: Edward AD: "[PATCH] ptp: ptp_read should not release queue"
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