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

Status: closed as dup on 2022/10/05 09:10
Subsystems: jfs
[Documentation on labels]
Reported-by: syzbot+cfd8fb005ec6f019dd45@syzkaller.appspotmail.com
First crash: 1389d, last: 1012d
Cause bisection: the issue happens on the oldest tested release (bisect log)
Crash: KASAN: slab-out-of-bounds Read in ea_get (log)
Repro: C syz .config
  
▶ ▼ Duplicate of
Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported
KASAN: slab-out-of-bounds Read in hex_dump_to_buffer jfs 17 C inconclusive inconclusive 940 1155d 1392d
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
[syzbot] KASAN: slab-out-of-bounds Read in ea_get 1 (2) 2022/10/05 09:10
▶ ▼ Similar bugs (7)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.19 KASAN: slab-out-of-bounds Read in ea_get 17 3 1356d 1389d 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 17 C done 5 590d 1148d 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 17 C error 18 607d 1150d 0/3 auto-obsoleted due to no activity on 2025/03/05 02:19
upstream KASAN: slab-out-of-bounds Read in ea_get (4) jfs 17 C 4 504d 527d 28/29 fixed on 2025/06/10 16:19
upstream KASAN: slab-out-of-bounds Read in ea_get (2) jfs 17 C 33 747d 812d 26/29 fixed on 2024/07/09 19:14
linux-4.14 KASAN: slab-out-of-bounds Read in ea_get 17 C 1 1248d 1387d 0/1 upstream: reported C repro on 2022/10/07 03:56
upstream KASAN: slab-out-of-bounds Read in ea_get (3) jfs 17 4 710d 700d 0/29 auto-obsoleted due to no activity on 2024/11/21 23:18

Sample crash report:
ffff8880793c4020: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
ffff8880793c4030: 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 ffff8880793c4040 by task syz-executor359/5032

CPU: 1 PID: 5032 Comm: syz-executor359 Not tainted 6.6.0-rc6-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+0x1e7/0x2d0 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:364 [inline]
 print_report+0x163/0x540 mm/kasan/report.c:475
 kasan_report+0x175/0x1b0 mm/kasan/report.c:588
 hex_dump_to_buffer+0x731/0xba0 lib/hexdump.c:193
 print_hex_dump+0x13f/0x250 lib/hexdump.c:276
 ea_get+0xce0/0x1280 fs/jfs/xattr.c:561
 __jfs_getxattr+0xd5/0x380 fs/jfs/xattr.c:807
 __vfs_getxattr+0x436/0x470 fs/xattr.c:424
 smk_fetch+0xb1/0x140 security/smack/smack_lsm.c:304
 smack_d_instantiate+0x74a/0xa50 security/smack/smack_lsm.c:3573
 security_d_instantiate+0x9b/0xf0 security/security.c:3799
 d_splice_alias+0x6f/0x330 fs/dcache.c:3145
 jfs_lookup+0x2c0/0x410 fs/jfs/namei.c:1472
 __lookup_slow+0x282/0x3e0 fs/namei.c:1693
 lookup_slow+0x53/0x70 fs/namei.c:1710
 walk_component+0x2d0/0x400 fs/namei.c:2001
 lookup_last fs/namei.c:2458 [inline]
 path_lookupat+0x16f/0x450 fs/namei.c:2482
 filename_lookup+0x255/0x610 fs/namei.c:2511
 user_path_at_empty+0x44/0x180 fs/namei.c:2910
 user_path_at include/linux/namei.h:57 [inline]
 path_listxattr fs/xattr.c:862 [inline]
 __do_sys_listxattr fs/xattr.c:877 [inline]
 __se_sys_listxattr fs/xattr.c:874 [inline]
 __x64_sys_listxattr+0x10c/0x230 fs/xattr.c:874
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fbd3841d879
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:00007ffd7b62e1a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000c2
RAX: ffffffffffffffda RBX: 00007ffd7b62e388 RCX: 00007fbd3841d879
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000000
RBP: 00007fbd38496610 R08: 0000000000005ed8 R09: 0000000000000000
R10: 00007ffd7b62e070 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffd7b62e378 R14: 0000000000000001 R15: 0000000000000001
 </TASK>

Allocated by task 5032:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4f/0x70 mm/kasan/common.c:52
 __kasan_slab_alloc+0x66/0x70 mm/kasan/common.c:328
 kasan_slab_alloc include/linux/kasan.h:188 [inline]
 slab_post_alloc_hook+0x67/0x3d0 mm/slab.h:762
 slab_alloc_node mm/slub.c:3478 [inline]
 slab_alloc mm/slub.c:3486 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3493 [inline]
 kmem_cache_alloc_lru+0x122/0x300 mm/slub.c:3509
 alloc_inode_sb include/linux/fs.h:2868 [inline]
 jfs_alloc_inode+0x28/0x60 fs/jfs/super.c:105
 alloc_inode fs/inode.c:259 [inline]
 iget_locked+0x1cc/0x830 fs/inode.c:1314
 jfs_iget+0x22/0x3b0 fs/jfs/inode.c:29
 jfs_lookup+0x226/0x410 fs/jfs/namei.c:1467
 __lookup_slow+0x282/0x3e0 fs/namei.c:1693
 lookup_slow+0x53/0x70 fs/namei.c:1710
 walk_component+0x2d0/0x400 fs/namei.c:2001
 lookup_last fs/namei.c:2458 [inline]
 path_lookupat+0x16f/0x450 fs/namei.c:2482
 filename_lookup+0x255/0x610 fs/namei.c:2511
 user_path_at_empty+0x44/0x180 fs/namei.c:2910
 user_path_at include/linux/namei.h:57 [inline]
 path_listxattr fs/xattr.c:862 [inline]
 __do_sys_listxattr fs/xattr.c:877 [inline]
 __se_sys_listxattr fs/xattr.c:874 [inline]
 __x64_sys_listxattr+0x10c/0x230 fs/xattr.c:874
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

The buggy address belongs to the object at ffff8880793c3780
 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 [ffff8880793c3780, ffff8880793c4040)

The buggy address belongs to the physical page:
page:ffffea0001e4f000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x793c0
head:ffffea0001e4f000 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 ffff888142e99280 dead000000000122 0000000000000000
raw: 0000000000000000 00000000800d000d 00000001ffffffff 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 5032, tgid 5032 (syz-executor359), ts 74864547725, free_ts 25776255517
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x1e6/0x210 mm/page_alloc.c:1536
 prep_new_page mm/page_alloc.c:1543 [inline]
 get_page_from_freelist+0x31db/0x3360 mm/page_alloc.c:3170
 __alloc_pages+0x255/0x670 mm/page_alloc.c:4426
 alloc_slab_page+0x6a/0x160 mm/slub.c:1870
 allocate_slab mm/slub.c:2017 [inline]
 new_slab+0x84/0x2f0 mm/slub.c:2070
 ___slab_alloc+0xc85/0x1310 mm/slub.c:3223
 __slab_alloc mm/slub.c:3322 [inline]
 __slab_alloc_node mm/slub.c:3375 [inline]
 slab_alloc_node mm/slub.c:3468 [inline]
 slab_alloc mm/slub.c:3486 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3493 [inline]
 kmem_cache_alloc_lru+0x1bf/0x300 mm/slub.c:3509
 alloc_inode_sb include/linux/fs.h:2868 [inline]
 jfs_alloc_inode+0x28/0x60 fs/jfs/super.c:105
 alloc_inode fs/inode.c:259 [inline]
 new_inode_pseudo+0x65/0x1d0 fs/inode.c:1004
 new_inode+0x22/0x1d0 fs/inode.c:1030
 jfs_fill_super+0x408/0xc50 fs/jfs/super.c:544
 mount_bdev+0x237/0x300 fs/super.c:1629
 legacy_get_tree+0xef/0x190 fs/fs_context.c:662
 vfs_get_tree+0x8c/0x280 fs/super.c:1750
 do_new_mount+0x28f/0xae0 fs/namespace.c:3335
 do_mount fs/namespace.c:3675 [inline]
 __do_sys_mount fs/namespace.c:3884 [inline]
 __se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3861
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1136 [inline]
 free_unref_page_prepare+0x8c3/0x9f0 mm/page_alloc.c:2312
 free_unref_page+0x37/0x3f0 mm/page_alloc.c:2405
 free_contig_range+0x9e/0x150 mm/page_alloc.c:6342
 destroy_args+0x95/0x7c0 mm/debug_vm_pgtable.c:1028
 debug_vm_pgtable+0x4ba/0x540 mm/debug_vm_pgtable.c:1408
 do_one_initcall+0x23d/0x7d0 init/main.c:1232
 do_initcall_level+0x157/0x210 init/main.c:1294
 do_initcalls+0x3f/0x80 init/main.c:1310
 kernel_init_freeable+0x429/0x5c0 init/main.c:1547
 kernel_init+0x1d/0x2a0 init/main.c:1437
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304

Memory state around the buggy address:
 ffff8880793c3f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8880793c3f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8880793c4000: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
                                           ^
 ffff8880793c4080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8880793c4100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================

Crashes (29):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/10/17 00:36 upstream 58720809f527 6388bc36 .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Read in ea_get
2023/06/30 01:27 upstream e8f75c0270d9 7b33cf8f .config strace log report syz C [mounted in repro] ci-upstream-kasan-gce-root KASAN: slab-out-of-bounds Read in ea_get
2022/10/12 01:44 upstream 55be6084c8e0 1353c374 .config strace log report syz C [mounted in repro] ci-upstream-kasan-gce-root KASAN: slab-out-of-bounds Read in ea_get
2022/10/06 17:48 upstream 833477fce7a1 80b58a42 .config strace log report syz C [mounted in repro] ci2-upstream-fs KASAN: slab-out-of-bounds Read in ea_get
2022/10/05 06:50 upstream 0326074ff465 267e3bb1 .config strace log report syz C [disk image] [vmlinux] [mounted in repro] ci2-upstream-fs KASAN: slab-out-of-bounds Read in ea_get
2022/10/04 21:10 upstream a5088ee7251e eab8f949 .config strace log report syz C [mounted in repro] ci-upstream-kasan-gce-selinux-root KASAN: slab-out-of-bounds Read in ea_get
2022/10/04 20:59 upstream a5088ee7251e eab8f949 .config strace log report syz C [disk image] [vmlinux] [mounted in repro] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Read in ea_get
2023/08/10 14:26 linux-next 21ef7b1e17d0 4df3089c .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Read in ea_get
2022/11/07 11:52 linux-next 0cdb3579f1ee 6d752409 .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Read in ea_get
2022/10/27 07:09 linux-next 4d48f589d294 86777b7f .config strace log report syz C [disk image] [vmlinux] [mounted in repro] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Read in ea_get
2023/06/01 10:50 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci eb0f1697d729 babc4389 .config console log report syz C [mounted in repro] ci-upstream-gce-arm64 KASAN: slab-out-of-bounds Read in ea_get
2023/08/08 03:35 upstream a027b2eca0b7 b1b6ae3d .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
2023/06/25 11:24 upstream a92b7d26c743 79782afc .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: slab-out-of-bounds Read in ea_get
2023/03/28 17:57 upstream 3a93e40326c8 48c74771 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: slab-out-of-bounds Read in ea_get
2022/10/19 18:51 upstream 493ffd6605b2 b31320fc .config console log report info [disk image] [vmlinux] ci2-upstream-fs KASAN: slab-out-of-bounds Read in ea_get
2022/10/12 11:40 upstream 493ffd6605b2 02b6492e .config console log report info [disk image] [vmlinux] ci2-upstream-fs KASAN: slab-out-of-bounds Read in ea_get
2022/10/09 07:50 upstream a6afa4199d3d aea5da89 .config console log report info [disk image] [vmlinux] ci2-upstream-fs KASAN: slab-out-of-bounds Read in ea_get
2022/10/06 18:15 upstream 833477fce7a1 131b38ac .config console log report info ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Read in ea_get
2022/10/06 18:11 upstream 833477fce7a1 131b38ac .config console log report info ci-qemu-upstream KASAN: slab-out-of-bounds Read in ea_get
2022/10/05 07:49 upstream 0326074ff465 267e3bb1 .config console log report info ci-qemu-upstream KASAN: slab-out-of-bounds Read in ea_get
2022/10/05 07:26 upstream a5088ee7251e eab8f949 .config console log report info [disk image] [vmlinux] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Read in ea_get
2022/10/05 07:19 upstream 0326074ff465 267e3bb1 .config console log report info ci-qemu-upstream KASAN: slab-out-of-bounds Read in ea_get
2022/10/05 07:07 upstream a5088ee7251e eab8f949 .config console log report info [disk image] [vmlinux] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Read in ea_get
2022/10/05 06:56 upstream 0326074ff465 267e3bb1 .config console log report info ci-qemu-upstream KASAN: slab-out-of-bounds Read in ea_get
2022/10/05 06:50 upstream a5088ee7251e eab8f949 .config console log report info [disk image] [vmlinux] ci-upstream-kasan-gce-root KASAN: slab-out-of-bounds Read in ea_get
2022/10/04 19:48 upstream a5088ee7251e eab8f949 .config console log report info ci-upstream-kasan-gce-selinux-root KASAN: slab-out-of-bounds Read in ea_get
2022/10/04 19:38 upstream a5088ee7251e eab8f949 .config console log report info [disk image] [vmlinux] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Read in ea_get
2022/10/04 17:01 upstream 4fe89d07dcc2 eab8f949 .config console log report info ci2-upstream-fs KASAN: slab-out-of-bounds Read in ea_get
2022/10/24 02:28 linux-next 4d48f589d294 23bf86af .config console log report info [disk image] [vmlinux] ci-upstream-linux-next-kasan-gce-root KASAN: slab-out-of-bounds Read in ea_get
* Struck through repros no longer work on HEAD.