syzbot


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

Status: closed as dup on 2022/10/05 09:10
Reported-by: syzbot+cfd8fb005ec6f019dd45@syzkaller.appspotmail.com
First crash: 119d, last: 85d

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 (1):
Title Repro Cause bisect Fix bisect Count Last Reported
KASAN: slab-out-of-bounds Read in hex_dump_to_buffer C inconclusive 940 5d21h 122d
similar bugs (2):
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 86d 119d 0/1 upstream: reported on 2022/10/04 23:36
linux-4.14 KASAN: slab-out-of-bounds Read in ea_get C 1 8d22h 116d 0/1 upstream: reported C repro on 2022/10/07 03:56

Sample crash report:
ffff88806f8636a0: 00 02 00 00 00 00 00 00 a8 36 86 6f 80 88 ff ff  .........6.o....
ffff88806f8636b0: a8 36 86 6f 80 88 ff ff 00 00 00 00 00 00 00 00  .6.o............
ffff88806f8636c0: c0 36 86 6f 80 88 ff ff c0 36 86 6f 80 88 ff ff  .6.o.....6.o....
ffff88806f8636d0: 00 00 00 00 00 00 00 00 01 00 00 00 00 00 00 00  ................
ffff88806f8636e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
ffff88806f8636f0: 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+0xdc1/0xdf0 lib/hexdump.c:193
Read of size 1 at addr ffff88806f863700 by task syz-executor398/3604

CPU: 0 PID: 3604 Comm: syz-executor398 Not tainted 6.0.0-syzkaller-09589-g55be6084c8e0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:317 [inline]
 print_report.cold+0x2ba/0x719 mm/kasan/report.c:433
 kasan_report+0xb1/0x1e0 mm/kasan/report.c:495
 hex_dump_to_buffer+0xdc1/0xdf0 lib/hexdump.c:193
 print_hex_dump+0x12f/0x1d0 lib/hexdump.c:276
 ea_get.cold+0xaa/0x190 fs/jfs/xattr.c:561
 __jfs_getxattr+0xc4/0x3d0 fs/jfs/xattr.c:807
 jfs_get_acl+0x139/0x190 fs/jfs/acl.c:38
 get_acl.part.0+0xcf/0x2b0 fs/posix_acl.c:152
 get_acl fs/posix_acl.c:124 [inline]
 posix_acl_create.part.0+0xbd/0x4e0 fs/posix_acl.c:631
 posix_acl_create+0x12b/0x170 fs/posix_acl.c:665
 jfs_init_acl+0x85/0x390 fs/jfs/acl.c:134
 jfs_mkdir+0x28a/0xab0 fs/jfs/namei.c:236
 vfs_mkdir+0x489/0x740 fs/namei.c:4013
 do_mkdirat+0x28c/0x310 fs/namei.c:4038
 __do_sys_mkdirat fs/namei.c:4053 [inline]
 __se_sys_mkdirat fs/namei.c:4051 [inline]
 __x64_sys_mkdirat+0x115/0x170 fs/namei.c:4051
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f460f437d69
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffce1588aa8 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00007f460f437d69
RDX: 0000000000000050 RSI: 0000000020000040 RDI: 0000000000000003
RBP: 00007f460f3f7530 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000f8008000
R13: 0000000000000000 R14: 00080000000000f4 R15: 0000000000000000
 </TASK>

Allocated by task 3604:
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
 kasan_set_track mm/kasan/common.c:45 [inline]
 set_alloc_info mm/kasan/common.c:437 [inline]
 __kasan_slab_alloc+0x90/0xc0 mm/kasan/common.c:470
 kasan_slab_alloc include/linux/kasan.h:224 [inline]
 slab_post_alloc_hook mm/slab.h:727 [inline]
 slab_alloc_node mm/slub.c:3248 [inline]
 slab_alloc mm/slub.c:3256 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3263 [inline]
 kmem_cache_alloc_lru+0x255/0x720 mm/slub.c:3280
 alloc_inode_sb include/linux/fs.h:3107 [inline]
 jfs_alloc_inode+0x23/0x60 fs/jfs/super.c:105
 alloc_inode+0x61/0x230 fs/inode.c:259
 iget_locked+0x1b7/0x6f0 fs/inode.c:1286
 jfs_iget+0x1a/0x4d0 fs/jfs/inode.c:29
 jfs_lookup+0x246/0x2f0 fs/jfs/namei.c:1462
 lookup_open.isra.0+0x76a/0x12a0 fs/namei.c:3391
 open_last_lookups fs/namei.c:3481 [inline]
 path_openat+0x996/0x28f0 fs/namei.c:3688
 do_filp_open+0x1b6/0x400 fs/namei.c:3718
 do_sys_openat2+0x16d/0x4c0 fs/open.c:1310
 do_sys_open fs/open.c:1326 [inline]
 __do_sys_open fs/open.c:1334 [inline]
 __se_sys_open fs/open.c:1330 [inline]
 __x64_sys_open+0x119/0x1c0 fs/open.c:1330
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

The buggy address belongs to the object at ffff88806f862e40
 which belongs to the cache jfs_ip of size 2240
The buggy address is located 0 bytes to the right of
 2240-byte region [ffff88806f862e40, ffff88806f863700)

The buggy address belongs to the physical page:
page:ffffea0001be1800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x6f860
head:ffffea0001be1800 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 0000000000000000 dead000000000122 ffff88801882bc80
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 3604, tgid 3604 (syz-executor398), ts 37232016621, free_ts 10045620340
 prep_new_page mm/page_alloc.c:2532 [inline]
 get_page_from_freelist+0x109b/0x2ce0 mm/page_alloc.c:4283
 __alloc_pages+0x1c7/0x510 mm/page_alloc.c:5549
 alloc_pages+0x1a6/0x270 mm/mempolicy.c:2270
 alloc_slab_page mm/slub.c:1829 [inline]
 allocate_slab+0x27e/0x3d0 mm/slub.c:1974
 new_slab mm/slub.c:2034 [inline]
 ___slab_alloc+0x84f/0xe80 mm/slub.c:3036
 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3123
 slab_alloc_node mm/slub.c:3214 [inline]
 slab_alloc mm/slub.c:3256 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3263 [inline]
 kmem_cache_alloc_lru+0x528/0x720 mm/slub.c:3280
 alloc_inode_sb include/linux/fs.h:3107 [inline]
 jfs_alloc_inode+0x23/0x60 fs/jfs/super.c:105
 alloc_inode+0x61/0x230 fs/inode.c:259
 new_inode_pseudo fs/inode.c:1018 [inline]
 new_inode+0x27/0x270 fs/inode.c:1046
 jfs_fill_super+0x436/0xc70 fs/jfs/super.c:544
 mount_bdev+0x34d/0x410 fs/super.c:1400
 legacy_get_tree+0x105/0x220 fs/fs_context.c:610
 vfs_get_tree+0x89/0x2f0 fs/super.c:1530
 do_new_mount fs/namespace.c:3040 [inline]
 path_mount+0x1326/0x1e20 fs/namespace.c:3370
 do_mount fs/namespace.c:3383 [inline]
 __do_sys_mount fs/namespace.c:3591 [inline]
 __se_sys_mount fs/namespace.c:3568 [inline]
 __x64_sys_mount+0x27f/0x300 fs/namespace.c:3568
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1449 [inline]
 free_pcp_prepare+0x5e4/0xd20 mm/page_alloc.c:1499
 free_unref_page_prepare mm/page_alloc.c:3380 [inline]
 free_unref_page+0x19/0x4d0 mm/page_alloc.c:3476
 free_contig_range+0xb1/0x180 mm/page_alloc.c:9457
 destroy_args+0xa8/0x646 mm/debug_vm_pgtable.c:1031
 debug_vm_pgtable+0x2945/0x29d6 mm/debug_vm_pgtable.c:1354
 do_one_initcall+0xfe/0x650 init/main.c:1296
 do_initcall_level init/main.c:1369 [inline]
 do_initcalls init/main.c:1385 [inline]
 do_basic_setup init/main.c:1404 [inline]
 kernel_init_freeable+0x6b1/0x73a init/main.c:1623
 kernel_init+0x1a/0x1d0 init/main.c:1512
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306

Memory state around the buggy address:
 ffff88806f863600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88806f863680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88806f863700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                   ^
 ffff88806f863780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88806f863800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================

Crashes (22):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets Title
ci-upstream-kasan-gce-root 2022/10/12 01:44 upstream 55be6084c8e0 1353c374 .config strace log report syz C [disk image] [vmlinux] [mounted in repro] KASAN: slab-out-of-bounds Read in ea_get
ci2-upstream-fs 2022/10/06 17:48 upstream 833477fce7a1 80b58a42 .config strace log report syz C [disk image] [vmlinux] [mounted in repro] KASAN: slab-out-of-bounds Read in ea_get
ci2-upstream-fs 2022/10/05 06:50 upstream 0326074ff465 267e3bb1 .config strace log report syz C [disk image] [vmlinux] [mounted in repro] KASAN: slab-out-of-bounds Read in ea_get
ci-upstream-kasan-gce-selinux-root 2022/10/04 21:10 upstream a5088ee7251e eab8f949 .config strace log report syz C [disk image] [vmlinux] [mounted in repro] KASAN: slab-out-of-bounds Read in ea_get
ci-upstream-kasan-gce-smack-root 2022/10/04 20:59 upstream a5088ee7251e eab8f949 .config strace log report syz C [disk image] [vmlinux] [mounted in repro] KASAN: slab-out-of-bounds Read in ea_get
ci-upstream-linux-next-kasan-gce-root 2022/11/07 11:52 linux-next 0cdb3579f1ee 6d752409 .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] KASAN: slab-out-of-bounds Read in ea_get
ci-upstream-linux-next-kasan-gce-root 2022/10/27 07:09 linux-next 4d48f589d294 86777b7f .config strace log report syz C [disk image] [vmlinux] [mounted in repro] KASAN: slab-out-of-bounds Read in ea_get
ci2-upstream-fs 2022/10/19 18:51 upstream 493ffd6605b2 b31320fc .config console log report info [disk image] [vmlinux] KASAN: slab-out-of-bounds Read in ea_get
ci2-upstream-fs 2022/10/12 11:40 upstream 493ffd6605b2 02b6492e .config console log report info [disk image] [vmlinux] KASAN: slab-out-of-bounds Read in ea_get
ci2-upstream-fs 2022/10/09 07:50 upstream a6afa4199d3d aea5da89 .config console log report info [disk image] [vmlinux] KASAN: slab-out-of-bounds Read in ea_get
ci-upstream-kasan-gce-smack-root 2022/10/06 18:15 upstream 833477fce7a1 131b38ac .config console log report info [disk image] [vmlinux] KASAN: slab-out-of-bounds Read in ea_get
ci-qemu-upstream 2022/10/06 18:11 upstream 833477fce7a1 131b38ac .config console log report info KASAN: slab-out-of-bounds Read in ea_get
ci-qemu-upstream 2022/10/05 07:49 upstream 0326074ff465 267e3bb1 .config console log report info KASAN: slab-out-of-bounds Read in ea_get
ci-upstream-kasan-gce-smack-root 2022/10/05 07:26 upstream a5088ee7251e eab8f949 .config console log report info [disk image] [vmlinux] KASAN: slab-out-of-bounds Read in ea_get
ci-qemu-upstream 2022/10/05 07:19 upstream 0326074ff465 267e3bb1 .config console log report info KASAN: slab-out-of-bounds Read in ea_get
ci-upstream-kasan-gce-smack-root 2022/10/05 07:07 upstream a5088ee7251e eab8f949 .config console log report info [disk image] [vmlinux] KASAN: slab-out-of-bounds Read in ea_get
ci-qemu-upstream 2022/10/05 06:56 upstream 0326074ff465 267e3bb1 .config console log report info KASAN: slab-out-of-bounds Read in ea_get
ci-upstream-kasan-gce-root 2022/10/05 06:50 upstream a5088ee7251e eab8f949 .config console log report info [disk image] [vmlinux] KASAN: slab-out-of-bounds Read in ea_get
ci-upstream-kasan-gce-selinux-root 2022/10/04 19:48 upstream a5088ee7251e eab8f949 .config console log report info [disk image] [vmlinux] KASAN: slab-out-of-bounds Read in ea_get
ci-upstream-kasan-gce-smack-root 2022/10/04 19:38 upstream a5088ee7251e eab8f949 .config console log report info [disk image] [vmlinux] KASAN: slab-out-of-bounds Read in ea_get
ci2-upstream-fs 2022/10/04 17:01 upstream 4fe89d07dcc2 eab8f949 .config console log report info [disk image] [vmlinux] KASAN: slab-out-of-bounds Read in ea_get
ci-upstream-linux-next-kasan-gce-root 2022/10/24 02:28 linux-next 4d48f589d294 23bf86af .config console log report info [disk image] [vmlinux] KASAN: slab-out-of-bounds Read in ea_get
* Struck through repros no longer work on HEAD.