syzbot


KASAN: slab-out-of-bounds Write in hfs_asc2mac

Status: upstream: reported C repro on 2022/11/25 09:45
Reported-by: syzbot+dc3b1cf9111ab5fe98e7@syzkaller.appspotmail.com
First crash: 2d00h, last: 2h40m

Cause bisection: failed (bisect log)
similar bugs (1):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.19 KASAN: slab-out-of-bounds Write in hfs_asc2mac C 2 8h29m 23h34m 0/1 upstream: reported C repro on 2022/11/26 02:11

Sample crash report:
hfs: filesystem was not cleanly unmounted, running fsck.hfs is recommended.  mounting read-only.
==================================================================
BUG: KASAN: slab-out-of-bounds in hfs_asc2mac+0x467/0x9a0 fs/hfs/trans.c:133
Write of size 1 at addr ffff888027551fce by task syz-executor166/3631

CPU: 0 PID: 3631 Comm: syz-executor166 Not tainted 6.1.0-rc6-syzkaller-00176-g08ad43d554ba #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1b1/0x28e lib/dump_stack.c:106
 print_address_description+0x74/0x340 mm/kasan/report.c:284
 print_report+0x107/0x1f0 mm/kasan/report.c:395
 kasan_report+0xcd/0x100 mm/kasan/report.c:495
 hfs_asc2mac+0x467/0x9a0 fs/hfs/trans.c:133
 hfs_cat_build_key+0x92/0x170 fs/hfs/catalog.c:28
 hfs_lookup+0x1ab/0x2c0 fs/hfs/dir.c:31
 __lookup_slow+0x266/0x3a0 fs/namei.c:1685
 lookup_slow+0x53/0x70 fs/namei.c:1702
 walk_component+0x2e1/0x410 fs/namei.c:1993
 lookup_last fs/namei.c:2450 [inline]
 path_lookupat+0x17d/0x450 fs/namei.c:2474
 filename_lookup+0x274/0x650 fs/namei.c:2503
 kern_path+0x37/0x180 fs/namei.c:2593
 tomoyo_mount_acl security/tomoyo/mount.c:136 [inline]
 tomoyo_mount_permission+0x7f9/0xa90 security/tomoyo/mount.c:237
 security_sb_mount+0x70/0xd0 security/security.c:979
 path_mount+0xbd/0x10c0 fs/namespace.c:3312
 do_mount fs/namespace.c:3383 [inline]
 __do_sys_mount fs/namespace.c:3591 [inline]
 __se_sys_mount+0x2d3/0x3c0 fs/namespace.c:3568
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f704128fb39
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 14 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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd8bdf0c38 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f704128fb39
RDX: 0000000000000000 RSI: 00000000200000c0 RDI: 0000000020000100
RBP: 00007f704124f140 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000269415 R11: 0000000000000246 R12: 00007f704124f1d0
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>

Allocated by task 3631:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x3d/0x60 mm/kasan/common.c:52
 ____kasan_kmalloc mm/kasan/common.c:371 [inline]
 __kasan_kmalloc+0x97/0xb0 mm/kasan/common.c:380
 kasan_kmalloc include/linux/kasan.h:211 [inline]
 __do_kmalloc_node mm/slab_common.c:955 [inline]
 __kmalloc+0xaf/0x1a0 mm/slab_common.c:968
 kmalloc include/linux/slab.h:558 [inline]
 hfs_find_init+0x8b/0x1e0 fs/hfs/bfind.c:21
 hfs_lookup+0x105/0x2c0 fs/hfs/dir.c:28
 __lookup_slow+0x266/0x3a0 fs/namei.c:1685
 lookup_slow+0x53/0x70 fs/namei.c:1702
 walk_component+0x2e1/0x410 fs/namei.c:1993
 lookup_last fs/namei.c:2450 [inline]
 path_lookupat+0x17d/0x450 fs/namei.c:2474
 filename_lookup+0x274/0x650 fs/namei.c:2503
 kern_path+0x37/0x180 fs/namei.c:2593
 tomoyo_mount_acl security/tomoyo/mount.c:136 [inline]
 tomoyo_mount_permission+0x7f9/0xa90 security/tomoyo/mount.c:237
 security_sb_mount+0x70/0xd0 security/security.c:979
 path_mount+0xbd/0x10c0 fs/namespace.c:3312
 do_mount fs/namespace.c:3383 [inline]
 __do_sys_mount fs/namespace.c:3591 [inline]
 __se_sys_mount+0x2d3/0x3c0 fs/namespace.c:3568
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

The buggy address belongs to the object at ffff888027551f80
 which belongs to the cache kmalloc-96 of size 96
The buggy address is located 78 bytes inside of
 96-byte region [ffff888027551f80, ffff888027551fe0)

The buggy address belongs to the physical page:
page:ffffea00009d5440 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x27551
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 ffffea0000788800 dead000000000005 ffff888012841780
raw: 0000000000000000 0000000080200020 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 1, tgid 1 (swapper/0), ts 12129986697, free_ts 12104206166
 prep_new_page mm/page_alloc.c:2539 [inline]
 get_page_from_freelist+0x742/0x7c0 mm/page_alloc.c:4288
 __alloc_pages+0x259/0x560 mm/page_alloc.c:5555
 alloc_page_interleave+0x22/0x1c0 mm/mempolicy.c:2118
 alloc_slab_page+0x70/0xf0 mm/slub.c:1794
 allocate_slab+0x5e/0x4b0 mm/slub.c:1939
 new_slab mm/slub.c:1992 [inline]
 ___slab_alloc+0x782/0xe20 mm/slub.c:3180
 __slab_alloc mm/slub.c:3279 [inline]
 slab_alloc_node mm/slub.c:3364 [inline]
 __kmem_cache_alloc_node+0x252/0x310 mm/slub.c:3437
 __do_kmalloc_node mm/slab_common.c:954 [inline]
 __kmalloc+0x9e/0x1a0 mm/slab_common.c:968
 kmalloc include/linux/slab.h:558 [inline]
 asymmetric_key_generate_id+0x2a/0xb0 crypto/asymmetric_keys/asymmetric_type.c:155
 x509_cert_parse+0x547/0x7b0 crypto/asymmetric_keys/x509_cert_parser.c:122
 x509_key_preparse+0x61/0x680 crypto/asymmetric_keys/x509_public_key.c:153
 asymmetric_key_preparse+0x92/0x170 crypto/asymmetric_keys/asymmetric_type.c:418
 key_create_or_update+0x598/0xdb0 security/keys/key.c:866
 x509_load_certificate_list+0x148/0x280 crypto/asymmetric_keys/x509_loader.c:31
 __integrity_init_keyring+0x198/0x2df security/integrity/digsig.c:119
 ima_init+0x3c/0x11f security/integrity/ima/ima_init.c:124
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1459 [inline]
 free_pcp_prepare+0x80c/0x8f0 mm/page_alloc.c:1509
 free_unref_page_prepare mm/page_alloc.c:3387 [inline]
 free_unref_page_list+0xb4/0x7b0 mm/page_alloc.c:3529
 release_pages+0x232a/0x25c0 mm/swap.c:1055
 tlb_batch_pages_flush mm/mmu_gather.c:59 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:256 [inline]
 tlb_flush_mmu+0x850/0xa70 mm/mmu_gather.c:263
 tlb_finish_mmu+0xcb/0x200 mm/mmu_gather.c:363
 exit_mmap+0x275/0x630 mm/mmap.c:3105
 __mmput+0x114/0x3b0 kernel/fork.c:1185
 free_bprm+0x136/0x2f0 fs/exec.c:1486
 kernel_execve+0x40d/0xa00 fs/exec.c:2004
 call_usermodehelper_exec_async+0x262/0x3b0 kernel/umh.c:113
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306

Memory state around the buggy address:
 ffff888027551e80: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc
 ffff888027551f00: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
>ffff888027551f80: 00 00 00 00 00 00 00 00 00 06 fc fc fc fc fc fc
                                              ^
 ffff888027552000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888027552080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================

Crashes (20):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci2-upstream-fs 2022/11/26 09:15 upstream 08ad43d554ba f4470a7b .config log report syz C KASAN: slab-out-of-bounds Write in hfs_asc2mac
ci2-upstream-fs 2022/11/25 01:46 upstream 4312098baf37 ff68ff8f .config log report syz C KASAN: slab-out-of-bounds Write in hfs_asc2mac
ci-upstream-kasan-gce-root 2022/11/26 23:06 upstream 644e9524388a 74a66371 .config log report info KASAN: slab-out-of-bounds Write in hfs_asc2mac
ci2-upstream-fs 2022/11/26 16:23 upstream 644e9524388a f4470a7b .config log report info KASAN: slab-out-of-bounds Write in hfs_asc2mac
ci-qemu-upstream 2022/11/26 10:13 upstream 0b1dcc2cf55a f4470a7b .config log report info KASAN: slab-out-of-bounds Write in hfs_asc2mac
ci2-upstream-fs 2022/11/26 09:30 upstream 08ad43d554ba f4470a7b .config log report info KASAN: slab-out-of-bounds Write in hfs_asc2mac
ci2-upstream-fs 2022/11/26 08:53 upstream 08ad43d554ba f4470a7b .config log report info KASAN: slab-out-of-bounds Write in hfs_asc2mac
ci-upstream-kasan-gce-smack-root 2022/11/26 08:48 upstream 0b1dcc2cf55a 74a66371 .config log report info KASAN: slab-out-of-bounds Write in hfs_asc2mac
ci-upstream-kasan-gce-smack-root 2022/11/26 08:37 upstream 0b1dcc2cf55a 74a66371 .config log report info KASAN: slab-out-of-bounds Write in hfs_asc2mac
ci-upstream-kasan-gce-root 2022/11/26 08:37 upstream 0b1dcc2cf55a 74a66371 .config log report info KASAN: slab-out-of-bounds Write in hfs_asc2mac
ci2-upstream-fs 2022/11/26 08:24 upstream 08ad43d554ba f4470a7b .config log report info KASAN: slab-out-of-bounds Write in hfs_asc2mac
ci-upstream-kasan-gce-smack-root 2022/11/26 08:17 upstream 0b1dcc2cf55a 74a66371 .config log report info KASAN: slab-out-of-bounds Write in hfs_asc2mac
ci2-upstream-fs 2022/11/26 08:16 upstream 08ad43d554ba f4470a7b .config log report info KASAN: slab-out-of-bounds Write in hfs_asc2mac
ci-upstream-kasan-gce-smack-root 2022/11/26 08:15 upstream 0b1dcc2cf55a 74a66371 .config log report info KASAN: slab-out-of-bounds Write in hfs_asc2mac
ci2-upstream-fs 2022/11/26 07:45 upstream 08ad43d554ba f4470a7b .config log report info KASAN: slab-out-of-bounds Write in hfs_asc2mac
ci2-upstream-fs 2022/11/26 02:56 upstream 08ad43d554ba f4470a7b .config log report info KASAN: slab-out-of-bounds Write in hfs_asc2mac
ci2-upstream-fs 2022/11/26 02:37 upstream 08ad43d554ba f4470a7b .config log report info KASAN: slab-out-of-bounds Write in hfs_asc2mac
ci2-upstream-fs 2022/11/26 02:12 upstream 08ad43d554ba f4470a7b .config log report info KASAN: slab-out-of-bounds Write in hfs_asc2mac
ci2-upstream-fs 2022/11/25 21:58 upstream 08ad43d554ba f4470a7b .config log report info KASAN: slab-out-of-bounds Write in hfs_asc2mac
ci2-upstream-fs 2022/11/25 01:29 upstream 4312098baf37 ff68ff8f .config log report info KASAN: slab-out-of-bounds Write in hfs_asc2mac
* Struck through repros no longer work on HEAD.