[syzbot] [bcachefs?] KASAN: slab-out-of-bounds Read in journal_entry_dev_usage_to_text
From: syzbot
Date: Mon Jul 29 2024 - 21:14:31 EST
Hello,
syzbot found the following issue on:
HEAD commit: 1722389b0d86 Merge tag 'net-6.11-rc1' of git://git.kernel...
git tree: upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=1544b603980000
kernel config: https://syzkaller.appspot.com/x/.config?x=b698a1b2fcd7ef5f
dashboard link: https://syzkaller.appspot.com/bug?extid=05d7520be047c9be86e0
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=1686c69d980000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=150a1611980000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/e3f4ec8ccf7c/disk-1722389b.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/f19bcd908282/vmlinux-1722389b.xz
kernel image: https://storage.googleapis.com/syzbot-assets/d93604974a98/bzImage-1722389b.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/f4a9cf51fd0b/mount_0.gz
The issue was bisected to:
commit 03ef80b469d5d83530ce1ce15be78a40e5300f9b
Author: Kent Overstreet <kent.overstreet@xxxxxxxxx>
Date: Sat Sep 23 22:41:51 2023 +0000
bcachefs: Ignore unknown mount options
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=147b3b0d980000
final oops: https://syzkaller.appspot.com/x/report.txt?x=167b3b0d980000
console output: https://syzkaller.appspot.com/x/log.txt?x=127b3b0d980000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+05d7520be047c9be86e0@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: 03ef80b469d5 ("bcachefs: Ignore unknown mount options")
loop0: detected capacity change from 0 to 32768
==================================================================
BUG: KASAN: slab-out-of-bounds in journal_entry_dev_usage_to_text+0x109/0x1d0 fs/bcachefs/journal_io.c:731
Read of size 8 at addr ffff88807a286000 by task syz-executor816/5214
CPU: 1 UID: 0 PID: 5214 Comm: syz-executor816 Not tainted 6.10.0-syzkaller-12562-g1722389b0d86 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:93 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119
print_address_description mm/kasan/report.c:377 [inline]
print_report+0x169/0x550 mm/kasan/report.c:488
kasan_report+0x143/0x180 mm/kasan/report.c:601
journal_entry_dev_usage_to_text+0x109/0x1d0 fs/bcachefs/journal_io.c:731
bch2_sb_clean_to_text+0x138/0x240 fs/bcachefs/sb-clean.c:251
bch2_sb_field_validate+0x201/0x2e0 fs/bcachefs/super-io.c:1229
bch2_sb_validate+0xa69/0xe00 fs/bcachefs/super-io.c:468
__bch2_read_super+0xc1b/0x1370 fs/bcachefs/super-io.c:823
bch2_fs_open+0x246/0xdf0 fs/bcachefs/super.c:2084
bch2_fs_get_tree+0x731/0x1700 fs/bcachefs/fs.c:1933
vfs_get_tree+0x90/0x2a0 fs/super.c:1789
do_new_mount+0x2be/0xb40 fs/namespace.c:3472
do_mount fs/namespace.c:3812 [inline]
__do_sys_mount fs/namespace.c:4020 [inline]
__se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3997
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f14389cf06a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 5e 04 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 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:00007ffe1945e9d8 EFLAGS: 00000282 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffe1945e9f0 RCX: 00007f14389cf06a
RDX: 0000000020005b00 RSI: 0000000020005b40 RDI: 00007ffe1945e9f0
RBP: 0000000000000004 R08: 00007ffe1945ea30 R09: 0000000000005b72
R10: 0000000000000000 R11: 0000000000000282 R12: 0000000000000000
R13: 00007ffe1945ea30 R14: 0000000000000003 R15: 0000000001000000
</TASK>
Allocated by task 5214:
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:370 [inline]
__kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387
kasan_kmalloc include/linux/kasan.h:211 [inline]
__do_kmalloc_node mm/slub.c:4158 [inline]
__kmalloc_node_track_caller_noprof+0x225/0x440 mm/slub.c:4177
__do_krealloc mm/slab_common.c:1280 [inline]
krealloc_noprof+0x7d/0x120 mm/slab_common.c:1313
bch2_sb_realloc+0x2d2/0x660 fs/bcachefs/super-io.c:189
read_one_super+0x73b/0xf40 fs/bcachefs/super-io.c:660
__bch2_read_super+0x873/0x1370 fs/bcachefs/super-io.c:751
bch2_fs_open+0x246/0xdf0 fs/bcachefs/super.c:2084
bch2_fs_get_tree+0x731/0x1700 fs/bcachefs/fs.c:1933
vfs_get_tree+0x90/0x2a0 fs/super.c:1789
do_new_mount+0x2be/0xb40 fs/namespace.c:3472
do_mount fs/namespace.c:3812 [inline]
__do_sys_mount fs/namespace.c:4020 [inline]
__se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3997
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff88807a284000
which belongs to the cache kmalloc-8k of size 8192
The buggy address is located 0 bytes to the right of
allocated 8192-byte region [ffff88807a284000, ffff88807a286000)
The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7a280
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
ksm flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xfdffffff(slab)
raw: 00fff00000000040 ffff888015442280 ffffea0000948200 0000000000000003
raw: 0000000000000000 0000000080020002 00000001fdffffff 0000000000000000
head: 00fff00000000040 ffff888015442280 ffffea0000948200 0000000000000003
head: 0000000000000000 0000000080020002 00000001fdffffff 0000000000000000
head: 00fff00000000003 ffffea0001e8a001 ffffffffffffffff 0000000000000000
head: 0000000000000008 0000000000000000 00000000ffffffff 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 4879, tgid 4879 (rcS), ts 34538747384, free_ts 34514158572
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1493
prep_new_page mm/page_alloc.c:1501 [inline]
get_page_from_freelist+0x2e4c/0x2f10 mm/page_alloc.c:3438
__alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4696
__alloc_pages_node_noprof include/linux/gfp.h:269 [inline]
alloc_pages_node_noprof include/linux/gfp.h:296 [inline]
alloc_slab_page+0x5f/0x120 mm/slub.c:2321
allocate_slab+0x5a/0x2f0 mm/slub.c:2484
new_slab mm/slub.c:2537 [inline]
___slab_alloc+0xcd1/0x14b0 mm/slub.c:3723
__slab_alloc+0x58/0xa0 mm/slub.c:3813
__slab_alloc_node mm/slub.c:3866 [inline]
slab_alloc_node mm/slub.c:4025 [inline]
__kmalloc_cache_noprof+0x1d5/0x2c0 mm/slub.c:4184
kmalloc_noprof include/linux/slab.h:681 [inline]
kzalloc_noprof include/linux/slab.h:807 [inline]
tomoyo_print_bprm security/tomoyo/audit.c:26 [inline]
tomoyo_init_log+0x11ce/0x2050 security/tomoyo/audit.c:264
tomoyo_supervisor+0x38a/0x11f0 security/tomoyo/common.c:2089
tomoyo_audit_env_log security/tomoyo/environ.c:36 [inline]
tomoyo_env_perm+0x178/0x210 security/tomoyo/environ.c:63
tomoyo_environ security/tomoyo/domain.c:672 [inline]
tomoyo_find_next_domain+0x1384/0x1cf0 security/tomoyo/domain.c:878
tomoyo_bprm_check_security+0x115/0x180 security/tomoyo/tomoyo.c:102
security_bprm_check+0x65/0x90 security/security.c:1191
search_binary_handler fs/exec.c:1809 [inline]
exec_binprm fs/exec.c:1863 [inline]
bprm_execve+0xa56/0x1770 fs/exec.c:1914
do_execveat_common+0x55f/0x6f0 fs/exec.c:2021
page last free pid 4878 tgid 4878 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1094 [inline]
free_unref_page+0xd19/0xea0 mm/page_alloc.c:2608
discard_slab mm/slub.c:2583 [inline]
__put_partials+0xeb/0x130 mm/slub.c:3051
put_cpu_partial+0x17c/0x250 mm/slub.c:3126
__slab_free+0x2ea/0x3d0 mm/slub.c:4343
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x9e/0x140 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:322
kasan_slab_alloc include/linux/kasan.h:201 [inline]
slab_post_alloc_hook mm/slub.c:3988 [inline]
slab_alloc_node mm/slub.c:4037 [inline]
kmem_cache_alloc_noprof+0x135/0x2a0 mm/slub.c:4044
vm_area_alloc+0x24/0x1d0 kernel/fork.c:471
mmap_region+0xc3d/0x2090 mm/mmap.c:2944
do_mmap+0x8f9/0x1010 mm/mmap.c:1468
vm_mmap_pgoff+0x1dd/0x3d0 mm/util.c:588
ksys_mmap_pgoff+0x4f1/0x720 mm/mmap.c:1514
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Memory state around the buggy address:
ffff88807a285f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff88807a285f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88807a286000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff88807a286080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88807a286100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
---
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