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KASAN: slab-out-of-bounds Read in ea_get (4)

Status: upstream: reported C repro on 2025/02/12 10:57
Subsystems: jfs
[Documentation on labels]
Reported-by: syzbot+4e6e7e4279d046613bc5@syzkaller.appspotmail.com
First crash: 12d, last: 12d
▶ ▼ Discussions (4)
Title Replies (including bot) Last reply
[PATCH v2] jfs: fix slab-out-of-bounds read in ea_get() 2 (2) 2025/02/19 22:23
Re: [PATCH] jfs: fix slab-out-of-bounds read in ea_get() 2 (2) 2025/02/19 05:10
[PATCH] jfs: fix slab-out-of-bounds read in ea_get() 2 (2) 2025/02/13 10:07
[syzbot] [jfs?] KASAN: slab-out-of-bounds Read in ea_get (4) 0 (2) 2025/02/12 22:56
▶ ▼ Similar bugs (7)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.19 KASAN: slab-out-of-bounds Read in ea_get 3 837d 870d 0/1 auto-obsoleted due to no activity on 2023/03/06 17:23
linux-6.1 KASAN: slab-out-of-bounds Read in ea_get origin:upstream missing-backport C done 5 71d 629d 3/3 fixed on 2025/01/21 16:28
linux-5.15 KASAN: slab-out-of-bounds Read in ea_get origin:upstream missing-backport C error 18 88d 630d 0/3 upstream: reported C repro on 2023/06/01 07:39
upstream KASAN: slab-out-of-bounds Read in ea_get (2) jfs C 33 228d 293d 26/28 fixed on 2024/07/09 19:14
linux-4.14 KASAN: slab-out-of-bounds Read in ea_get C 1 729d 868d 0/1 upstream: reported C repro on 2022/10/07 03:56
upstream KASAN: slab-out-of-bounds Read in ea_get (3) jfs 4 191d 181d 0/28 auto-obsoleted due to no activity on 2024/11/21 23:18
upstream KASAN: slab-out-of-bounds Read in ea_get jfs C inconclusive 29 493d 870d 0/28 closed as dup on 2022/10/05 09:10
▶ ▼ Last patch testing requests (1)
Created Duration User Patch Repo Result
2025/02/12 22:56 36m qasdev00@gmail.com patch upstream OK log

Sample crash report:
ffff88804566b698: 90 b6 66 45 80 88 ff ff 00 00 00 00 00 00 00 00  ..fE............
ffff88804566b6a8: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
ffff88804566b6b8: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
==================================================================
BUG: KASAN: slab-out-of-bounds in hex_dump_to_buffer+0x731/0xba0 lib/hexdump.c:193
Read of size 1 at addr ffff88804566b6d0 by task syz-executor271/5307

CPU: 0 UID: 0 PID: 5307 Comm: syz-executor271 Not tainted 6.14.0-rc1-syzkaller-00181-g7ee983c850b4 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
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:378 [inline]
 print_report+0x169/0x550 mm/kasan/report.c:489
 kasan_report+0x143/0x180 mm/kasan/report.c:602
 hex_dump_to_buffer+0x731/0xba0 lib/hexdump.c:193
 print_hex_dump+0x13f/0x250 lib/hexdump.c:276
 ea_get+0xd30/0x12e0 fs/jfs/xattr.c:565
 __jfs_setxattr+0xfc/0x1190 fs/jfs/xattr.c:675
 __jfs_xattr_set+0xf9/0x180 fs/jfs/xattr.c:936
 __vfs_setxattr+0x468/0x4a0 fs/xattr.c:200
 __vfs_setxattr_noperm+0x12e/0x660 fs/xattr.c:234
 vfs_setxattr+0x221/0x430 fs/xattr.c:321
 do_setxattr fs/xattr.c:636 [inline]
 filename_setxattr+0x2af/0x430 fs/xattr.c:665
 path_setxattrat+0x440/0x510 fs/xattr.c:713
 __do_sys_lsetxattr fs/xattr.c:754 [inline]
 __se_sys_lsetxattr fs/xattr.c:750 [inline]
 __x64_sys_lsetxattr+0xbf/0xe0 fs/xattr.c:750
 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: 0033:0x7fee5a1fde19
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff6b319538 EFLAGS: 00000246 ORIG_RAX: 00000000000000bd
RAX: ffffffffffffffda RBX: 00007fee5a247095 RCX: 00007fee5a1fde19
RDX: 0000000000000000 RSI: 0000400000002580 RDI: 0000400000000080
RBP: 00007fee5a27a5f0 R08: 0000000000000001 R09: 00005555596ac4c0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff6b319560
R13: 00007fff6b319788 R14: 431bde82d7b634db R15: 00007fee5a24703b
 </TASK>

Allocated by task 5307:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
 unpoison_slab_object mm/kasan/common.c:319 [inline]
 __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:345
 kasan_slab_alloc include/linux/kasan.h:250 [inline]
 slab_post_alloc_hook mm/slub.c:4115 [inline]
 slab_alloc_node mm/slub.c:4164 [inline]
 kmem_cache_alloc_lru_noprof+0x1dd/0x390 mm/slub.c:4183
 jfs_alloc_inode+0x28/0x70 fs/jfs/super.c:105
 alloc_inode+0x65/0x1a0 fs/inode.c:336
 iget_locked+0xf1/0x5a0 fs/inode.c:1487
 jfs_iget+0x23/0x3e0 fs/jfs/inode.c:29
 jfs_lookup+0x226/0x410 fs/jfs/namei.c:1469
 __lookup_slow+0x296/0x400 fs/namei.c:1793
 lookup_slow+0x53/0x70 fs/namei.c:1810
 walk_component+0x2e1/0x410 fs/namei.c:2114
 lookup_last fs/namei.c:2612 [inline]
 path_lookupat+0x16f/0x450 fs/namei.c:2636
 filename_lookup+0x2a3/0x670 fs/namei.c:2665
 filename_setxattr+0xb9/0x430 fs/xattr.c:660
 path_setxattrat+0x440/0x510 fs/xattr.c:713
 __do_sys_lsetxattr fs/xattr.c:754 [inline]
 __se_sys_lsetxattr fs/xattr.c:750 [inline]
 __x64_sys_lsetxattr+0xbf/0xe0 fs/xattr.c:750
 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 ffff88804566ae18
 which belongs to the cache jfs_ip of size 2232
The buggy address is located 0 bytes to the right of
 allocated 2232-byte region [ffff88804566ae18, ffff88804566b6d0)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x45668
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x4fff00000000040(head|node=1|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 04fff00000000040 ffff88801f64b780 dead000000000122 0000000000000000
raw: 0000000000000000 00000000800d000d 00000000f5000000 0000000000000000
head: 04fff00000000040 ffff88801f64b780 dead000000000122 0000000000000000
head: 0000000000000000 00000000800d000d 00000000f5000000 0000000000000000
head: 04fff00000000003 ffffea0001159a01 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 Reclaimable, gfp_mask 0xd2050(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_RECLAIMABLE), pid 5307, tgid 5307 (syz-executor271), ts 63066622694, free_ts 0
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1f4/0x240 mm/page_alloc.c:1551
 prep_new_page mm/page_alloc.c:1559 [inline]
 get_page_from_freelist+0x365c/0x37a0 mm/page_alloc.c:3477
 __alloc_frozen_pages_noprof+0x292/0x710 mm/page_alloc.c:4739
 alloc_pages_mpol+0x311/0x660 mm/mempolicy.c:2270
 alloc_slab_page mm/slub.c:2423 [inline]
 allocate_slab+0x8f/0x3a0 mm/slub.c:2587
 new_slab mm/slub.c:2640 [inline]
 ___slab_alloc+0xc27/0x14a0 mm/slub.c:3826
 __slab_alloc+0x58/0xa0 mm/slub.c:3916
 __slab_alloc_node mm/slub.c:3991 [inline]
 slab_alloc_node mm/slub.c:4152 [inline]
 kmem_cache_alloc_lru_noprof+0x26c/0x390 mm/slub.c:4183
 jfs_alloc_inode+0x28/0x70 fs/jfs/super.c:105
 alloc_inode+0x65/0x1a0 fs/inode.c:336
 new_inode_pseudo fs/inode.c:1174 [inline]
 new_inode+0x22/0x1d0 fs/inode.c:1193
 jfs_fill_super+0x570/0xd90 fs/jfs/super.c:511
 get_tree_bdev_flags+0x48c/0x5c0 fs/super.c:1636
 vfs_get_tree+0x90/0x2b0 fs/super.c:1814
 do_new_mount+0x2be/0xb40 fs/namespace.c:3560
 do_mount fs/namespace.c:3900 [inline]
 __do_sys_mount fs/namespace.c:4111 [inline]
 __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4088
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88804566b580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88804566b600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88804566b680: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc
                                                 ^
 ffff88804566b700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88804566b780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/02/08 11:51 upstream 7ee983c850b4 ef44b750 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci-snapshot-upstream-root KASAN: slab-out-of-bounds Read in ea_get
2025/02/08 11:21 upstream 7ee983c850b4 ef44b750 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci-snapshot-upstream-root KASAN: slab-out-of-bounds Read in ea_get
2025/02/08 10:50 upstream 7ee983c850b4 ef44b750 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: slab-out-of-bounds Read in ea_get
* Struck through repros no longer work on HEAD.