syzbot


KASAN: slab-out-of-bounds Read in ea_get (2)

Status: upstream: reported C repro on 2024/05/03 18:51
Subsystems: jfs
[Documentation on labels]
Reported-by: syzbot+9dfe490c8176301c1d06@syzkaller.appspotmail.com
Fix commit: 7c55b78818cf jfs: xattr: fix buffer overflow for invalid xattr
Patched on: [ci-qemu-native-arm64-kvm ci-qemu-upstream ci-qemu-upstream-386 ci-qemu2-arm32 ci-qemu2-arm64 ci-qemu2-arm64-compat ci-qemu2-arm64-mte ci-upstream-gce-leak ci-upstream-kasan-badwrites-root ci-upstream-kasan-gce ci-upstream-kasan-gce-386 ci-upstream-kasan-gce-root ci-upstream-kasan-gce-selinux-root ci-upstream-kasan-gce-smack-root ci-upstream-kmsan-gce-386-root ci-upstream-kmsan-gce-root ci-upstream-linux-next-kasan-gce-root ci-upstream-net-kasan-gce ci-upstream-net-this-kasan-gce ci2-upstream-fs ci2-upstream-kcsan-gce ci2-upstream-net-next-test-gce ci2-upstream-usb], missing on: [ci-qemu2-riscv64 ci-upstream-bpf-kasan-gce ci-upstream-bpf-next-kasan-gce ci-upstream-gce-arm64]
First crash: 53d, last: 19d
Discussions (2)
Title Replies (including bot) Last reply
[syzbot] [jfs?] KASAN: slab-out-of-bounds Read in ea_get (2) 1 (2) 2024/05/14 10:12
[PATCH] jfs: xattr: fix buffer overflow for invalid xattr 1 (1) 2024/05/14 10:06
Similar bugs (5)
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 593d 626d 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 C 5 20d 385d 0/3 upstream: reported C repro on 2023/06/02 15:16
linux-5.15 KASAN: slab-out-of-bounds Read in ea_get origin:upstream C error 18 50d 387d 0/3 upstream: reported C repro on 2023/06/01 07:39
linux-4.14 KASAN: slab-out-of-bounds Read in ea_get C 1 485d 624d 0/1 upstream: reported C repro on 2022/10/07 03:56
upstream KASAN: slab-out-of-bounds Read in ea_get jfs C inconclusive 29 249d 626d 0/27 closed as dup on 2022/10/05 09:10
Last patch testing requests (1)
Created Duration User Patch Repo Result
2024/05/21 17:14 16m retest repro upstream report log

Sample crash report:
ffff88802ff24020: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
ffff88802ff24030: 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+0xdee/0xe30 lib/hexdump.c:193
Read of size 1 at addr ffff88802ff24040 by task syz-executor415/5186

CPU: 0 PID: 5186 Comm: syz-executor415 Not tainted 6.9.0-rc7-syzkaller-00012-gdccb07f2914c #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0xc3/0x620 mm/kasan/report.c:488
 kasan_report+0xd9/0x110 mm/kasan/report.c:601
 hex_dump_to_buffer+0xdee/0xe30 lib/hexdump.c:193
 print_hex_dump+0x18c/0x260 lib/hexdump.c:276
 ea_get+0x864/0x12c0 fs/jfs/xattr.c:561
 __jfs_getxattr+0xfd/0x3f0 fs/jfs/xattr.c:807
 jfs_xattr_get+0x3c/0x50 fs/jfs/xattr.c:931
 __vfs_getxattr+0x13b/0x1a0 fs/xattr.c:423
 inode_doinit_use_xattr+0xb5/0x410 security/selinux/hooks.c:1361
 inode_doinit_with_dentry+0x51f/0x12c0 security/selinux/hooks.c:1486
 selinux_d_instantiate+0x26/0x30 security/selinux/hooks.c:6345
 security_d_instantiate+0x57/0xf0 security/security.c:3915
 d_splice_alias+0x94/0xdf0 fs/dcache.c:2973
 jfs_lookup+0x237/0x370 fs/jfs/namei.c:1474
 __lookup_slow+0x24f/0x460 fs/namei.c:1692
 lookup_slow fs/namei.c:1709 [inline]
 walk_component+0x350/0x5b0 fs/namei.c:2004
 lookup_last fs/namei.c:2461 [inline]
 path_lookupat+0x17f/0x770 fs/namei.c:2485
 filename_lookup+0x1e5/0x5b0 fs/namei.c:2514
 user_path_at_empty+0x42/0x60 fs/namei.c:2921
 user_path_at include/linux/namei.h:57 [inline]
 path_listxattr+0x9c/0x160 fs/xattr.c:861
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcf/0x260 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fee15c3e879
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 61 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:00007ffdce0a03d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000c2
RAX: ffffffffffffffda RBX: 00007ffdce0a05b8 RCX: 00007fee15c3e879
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000000
RBP: 00007fee15cb7610 R08: 0000000000005ed8 R09: 0000000000000000
R10: 00007ffdce0a02a0 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffdce0a05a8 R14: 0000000000000001 R15: 0000000000000001
 </TASK>

Allocated by task 5186:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_save_track+0x14/0x30 mm/kasan/common.c:68
 unpoison_slab_object mm/kasan/common.c:312 [inline]
 __kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:338
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook mm/slub.c:3804 [inline]
 slab_alloc_node mm/slub.c:3851 [inline]
 kmem_cache_alloc_lru+0x142/0x700 mm/slub.c:3870
 alloc_inode_sb include/linux/fs.h:3091 [inline]
 jfs_alloc_inode+0x25/0x60 fs/jfs/super.c:105
 alloc_inode+0x5d/0x230 fs/inode.c:261
 iget_locked+0x1a1/0x6d0 fs/inode.c:1280
 jfs_iget+0x1e/0x4d0 fs/jfs/inode.c:29
 jfs_lookup+0x2a8/0x370 fs/jfs/namei.c:1469
 __lookup_slow+0x24f/0x460 fs/namei.c:1692
 lookup_slow fs/namei.c:1709 [inline]
 walk_component+0x350/0x5b0 fs/namei.c:2004
 lookup_last fs/namei.c:2461 [inline]
 path_lookupat+0x17f/0x770 fs/namei.c:2485
 filename_lookup+0x1e5/0x5b0 fs/namei.c:2514
 user_path_at_empty+0x42/0x60 fs/namei.c:2921
 user_path_at include/linux/namei.h:57 [inline]
 path_listxattr+0x9c/0x160 fs/xattr.c:861
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcf/0x260 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff88802ff23780
 which belongs to the cache jfs_ip of size 2240
The buggy address is located 0 bytes to the right of
 allocated 2240-byte region [ffff88802ff23780, ffff88802ff24040)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2ff20
head: 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 ffff88801668dcc0 dead000000000122 0000000000000000
raw: 0000000000000000 00000000800d000d 00000001ffffffff 0000000000000000
head: 00fff00000000840 ffff88801668dcc0 dead000000000122 0000000000000000
head: 0000000000000000 00000000800d000d 00000001ffffffff 0000000000000000
head: 00fff00000000003 ffffea0000bfc801 dead000000000122 00000000ffffffff
head: 0000000800000000 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 5186, tgid 195832007 (syz-executor415), ts 5186, free_ts 0
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x2d4/0x350 mm/page_alloc.c:1534
 prep_new_page mm/page_alloc.c:1541 [inline]
 get_page_from_freelist+0xa28/0x3780 mm/page_alloc.c:3317
 __alloc_pages+0x22b/0x2460 mm/page_alloc.c:4575
 __alloc_pages_node include/linux/gfp.h:238 [inline]
 alloc_pages_node include/linux/gfp.h:261 [inline]
 alloc_slab_page mm/slub.c:2180 [inline]
 allocate_slab mm/slub.c:2343 [inline]
 new_slab+0xcc/0x3a0 mm/slub.c:2396
 ___slab_alloc+0x66d/0x1790 mm/slub.c:3530
 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3615
 __slab_alloc_node mm/slub.c:3668 [inline]
 slab_alloc_node mm/slub.c:3841 [inline]
 kmem_cache_alloc_lru+0x383/0x700 mm/slub.c:3870
 alloc_inode_sb include/linux/fs.h:3091 [inline]
 jfs_alloc_inode+0x25/0x60 fs/jfs/super.c:105
 alloc_inode+0x5d/0x230 fs/inode.c:261
 new_inode_pseudo fs/inode.c:1007 [inline]
 new_inode+0x22/0x270 fs/inode.c:1033
 jfs_fill_super+0x433/0xd20 fs/jfs/super.c:544
 mount_bdev+0x1e3/0x2d0 fs/super.c:1658
 legacy_get_tree+0x109/0x220 fs/fs_context.c:662
 vfs_get_tree+0x8f/0x380 fs/super.c:1779
 do_new_mount fs/namespace.c:3352 [inline]
 path_mount+0x14e6/0x1f20 fs/namespace.c:3679
 do_mount fs/namespace.c:3692 [inline]
 __do_sys_mount fs/namespace.c:3898 [inline]
 __se_sys_mount fs/namespace.c:3875 [inline]
 __x64_sys_mount+0x297/0x320 fs/namespace.c:3875
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88802ff23f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88802ff23f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88802ff24000: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
                                           ^
 ffff88802ff24080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88802ff24100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================

Crashes (10):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/05/07 17:06 upstream dccb07f2914c cb2dcc0e .config console log report syz C [disk image (non-bootable)] [vmlinux] [kernel image] [mounted in repro] ci-qemu-upstream KASAN: slab-out-of-bounds Read in ea_get
2024/05/05 16:33 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 78186bd77b47 610f2a54 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-gce-arm64 KASAN: slab-out-of-bounds Read in ea_get
2024/05/05 16:13 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 78186bd77b47 610f2a54 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-gce-arm64 KASAN: slab-out-of-bounds Read in ea_get
2024/04/29 18:54 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 6a71d2909427 27e33c58 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-gce-arm64 KASAN: slab-out-of-bounds Read in ea_get
2024/06/02 22:39 upstream 83814698cf48 3113787f .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: slab-out-of-bounds Read in ea_get
2024/04/29 22:08 upstream b947cc5bf6d7 27e33c58 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root KASAN: slab-out-of-bounds Read in ea_get
2024/04/29 20:12 upstream b947cc5bf6d7 27e33c58 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Read in ea_get
2024/04/29 19:30 upstream b947cc5bf6d7 27e33c58 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root KASAN: slab-out-of-bounds Read in ea_get
2024/04/29 20:40 upstream b947cc5bf6d7 f10afd69 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 KASAN: slab-out-of-bounds Read in ea_get
2024/04/29 18:40 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 6a71d2909427 27e33c58 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 KASAN: slab-out-of-bounds Read in ea_get
* Struck through repros no longer work on HEAD.