syzbot


KASAN: slab-out-of-bounds Read in dtSearch

Status: upstream: reported C repro on 2024/04/28 11:04
Bug presence: origin:upstream
[Documentation on labels]
Reported-by: syzbot+34599b3b01761282d2a5@syzkaller.appspotmail.com
First crash: 46d, last: 46d
Fix bisection: failed (error log, bisect log)
  
Bug presence (1)
Date Name Commit Repro Result
2024/05/04 upstream (ToT) 7367539ad4b0 C [report] KASAN: slab-out-of-bounds Read in dtSearch
Similar bugs (4)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KASAN: slab-out-of-bounds Read in dtSearch jfs C error done 33 163d 626d 26/28 fixed on 2024/02/13 12:02
linux-4.14 KASAN: slab-out-of-bounds Read in dtSearch jfs C 2 469d 627d 0/1 upstream: reported C repro on 2022/09/24 21:35
upstream KASAN: slab-use-after-free Read in dtSearch jfs C inconclusive 24 12h54m 45d 0/28 upstream: reported C repro on 2024/04/29 00:37
linux-4.19 KASAN: slab-out-of-bounds Read in dtSearch C error 1 627d 627d 0/1 upstream: reported C repro on 2022/09/24 21:36

Sample crash report:
loop0: detected capacity change from 0 to 32768
==================================================================
BUG: KASAN: slab-out-of-bounds in dtCompare fs/jfs/jfs_dtree.c:3613 [inline]
BUG: KASAN: slab-out-of-bounds in dtSearch+0x131c/0x1f34 fs/jfs/jfs_dtree.c:649
Read of size 1 at addr ffff0000de8b4058 by task syz-executor784/3960

CPU: 1 PID: 3960 Comm: syz-executor784 Not tainted 5.15.157-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call trace:
 dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
 print_address_description+0x7c/0x3f0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:434 [inline]
 kasan_report+0x174/0x1e4 mm/kasan/report.c:451
 __asan_report_load1_noabort+0x44/0x50 mm/kasan/report_generic.c:306
 dtCompare fs/jfs/jfs_dtree.c:3613 [inline]
 dtSearch+0x131c/0x1f34 fs/jfs/jfs_dtree.c:649
 jfs_lookup+0x164/0x39c fs/jfs/namei.c:1459
 __lookup_slow+0x250/0x388 fs/namei.c:1663
 lookup_slow+0x60/0x84 fs/namei.c:1680
 walk_component+0x394/0x4cc fs/namei.c:1976
 link_path_walk+0x5a0/0xc38
 path_lookupat+0x90/0x3d0 fs/namei.c:2454
 do_o_path+0xa8/0x214 fs/namei.c:3713
 path_openat+0x216c/0x26cc fs/namei.c:3735
 do_filp_open+0x1a8/0x3b4 fs/namei.c:3769
 do_sys_openat2+0x128/0x3d8 fs/open.c:1253
 do_sys_open fs/open.c:1269 [inline]
 __do_sys_openat fs/open.c:1285 [inline]
 __se_sys_openat fs/open.c:1280 [inline]
 __arm64_sys_openat+0x1f0/0x240 fs/open.c:1280
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584

Allocated by task 3960:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:434 [inline]
 __kasan_slab_alloc+0x8c/0xcc mm/kasan/common.c:467
 kasan_slab_alloc include/linux/kasan.h:254 [inline]
 slab_post_alloc_hook+0x74/0x3f4 mm/slab.h:519
 slab_alloc_node mm/slub.c:3220 [inline]
 slab_alloc mm/slub.c:3228 [inline]
 kmem_cache_alloc+0x1dc/0x45c mm/slub.c:3233
 jfs_alloc_inode+0x24/0x60 fs/jfs/super.c:105
 alloc_inode fs/inode.c:236 [inline]
 new_inode_pseudo+0x68/0x200 fs/inode.c:937
 new_inode+0x38/0x174 fs/inode.c:966
 ialloc+0x58/0x7c0 fs/jfs/jfs_inode.c:48
 jfs_create+0x190/0xa1c fs/jfs/namei.c:92
 lookup_open fs/namei.c:3462 [inline]
 open_last_lookups fs/namei.c:3532 [inline]
 path_openat+0xf18/0x26cc fs/namei.c:3739
 do_filp_open+0x1a8/0x3b4 fs/namei.c:3769
 do_sys_openat2+0x128/0x3d8 fs/open.c:1253
 do_sys_open fs/open.c:1269 [inline]
 __do_sys_openat fs/open.c:1285 [inline]
 __se_sys_openat fs/open.c:1280 [inline]
 __arm64_sys_openat+0x1f0/0x240 fs/open.c:1280
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584

The buggy address belongs to the object at ffff0000de8b3780
 which belongs to the cache jfs_ip of size 2240
The buggy address is located 24 bytes to the right of
 2240-byte region [ffff0000de8b3780, ffff0000de8b4040)
The buggy address belongs to the page:
page:000000005a924bd1 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11e8b0
head:000000005a924bd1 order:3 compound_mapcount:0 compound_pincount:0
flags: 0x5ffe00000010200(slab|head|node=0|zone=2|lastcpupid=0xfff)
raw: 05ffe00000010200 0000000000000000 dead000000000122 ffff0000c61e5380
raw: 0000000000000000 00000000800d000d 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000de8b3f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff0000de8b3f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff0000de8b4000: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
                                                    ^
 ffff0000de8b4080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff0000de8b4100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
ERROR: (device loop0): dtSearch: stack overrun!

ERROR: (device loop0): remounting filesystem as read-only
btstack dump:
bn = 0, index = 0
bn = 0, index = 0
bn = 0, index = 0
bn = 0, index = 0
bn = 0, index = 0
bn = 0, index = 0
bn = 0, index = 0
bn = 0, index = 0
jfs_lookup: dtSearch returned -5

Crashes (5):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/04/28 11:39 linux-5.15.y b925f60c6ee7 07b455f9 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan-arm64 KASAN: slab-out-of-bounds Read in dtSearch
2024/04/28 11:14 linux-5.15.y b925f60c6ee7 07b455f9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 KASAN: slab-out-of-bounds Read in dtSearch
2024/04/28 11:12 linux-5.15.y b925f60c6ee7 07b455f9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 KASAN: slab-out-of-bounds Read in dtSearch
2024/04/28 11:10 linux-5.15.y b925f60c6ee7 07b455f9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 KASAN: slab-out-of-bounds Read in dtSearch
2024/04/28 11:04 linux-5.15.y b925f60c6ee7 07b455f9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 KASAN: slab-out-of-bounds Read in dtSearch
* Struck through repros no longer work on HEAD.