syzbot


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

Status: upstream: reported on 2022/10/04 10:58
Reported-by: syzbot+9353cae6f83b3c2213ac@syzkaller.appspotmail.com
First crash: 60d, last: 46d

Sample crash report:
==================================================================
BUG: KASAN: slab-out-of-bounds in load_system_files+0x319f/0x48d0 fs/ntfs/super.c:1833
Read of size 1 at addr ffff888074b03329 by task syz-executor.5/31156

CPU: 1 PID: 31156 Comm: syz-executor.5 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+0x1e3/0x2cb lib/dump_stack.c:106
 print_address_description+0x65/0x4b0 mm/kasan/report.c:317
 print_report+0x108/0x220 mm/kasan/report.c:433
 kasan_report+0xfb/0x130 mm/kasan/report.c:495
 load_system_files+0x319f/0x48d0 fs/ntfs/super.c:1833
 ntfs_fill_super+0x19a9/0x2bf0 fs/ntfs/super.c:2892
 mount_bdev+0x26c/0x3a0 fs/super.c:1400
 legacy_get_tree+0xea/0x180 fs/fs_context.c:610
 vfs_get_tree+0x88/0x270 fs/super.c:1530
 do_new_mount+0x289/0xad0 fs/namespace.c:3040
 do_mount fs/namespace.c:3383 [inline]
 __do_sys_mount fs/namespace.c:3591 [inline]
 __se_sys_mount+0x2e3/0x3d0 fs/namespace.c:3568
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fadf528cada
Code: 48 c7 c2 b8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 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:00007fadf64bbf88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 00007fadf528cada
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007fadf64bbfe0
RBP: 00007fadf64bc020 R08: 00007fadf64bc020 R09: 0000000020000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000000
R13: 0000000020000100 R14: 00007fadf64bbfe0 R15: 0000000020076700
 </TASK>

Allocated by task 30283:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:45 [inline]
 set_alloc_info mm/kasan/common.c:437 [inline]
 __kasan_slab_alloc+0xb2/0xe0 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+0x175/0x2d0 mm/slub.c:3280
 alloc_inode_sb include/linux/fs.h:3107 [inline]
 nilfs_alloc_inode+0x27/0xe0 fs/nilfs2/super.c:154
 alloc_inode fs/inode.c:259 [inline]
 iget5_locked+0x9c/0x270 fs/inode.c:1241
 nilfs_iget_locked+0x160/0x1f0 fs/nilfs2/inode.c:588
 nilfs_ifile_read+0x2e/0x170 fs/nilfs2/ifile.c:187
 nilfs_attach_checkpoint+0x281/0x500 fs/nilfs2/super.c:541
 nilfs_fill_super+0x347/0x650 fs/nilfs2/super.c:1064
 nilfs_mount+0x673/0x9e0 fs/nilfs2/super.c:1317
 legacy_get_tree+0xea/0x180 fs/fs_context.c:610
 vfs_get_tree+0x88/0x270 fs/super.c:1530
 do_new_mount+0x289/0xad0 fs/namespace.c:3040
 do_mount fs/namespace.c:3383 [inline]
 __do_sys_mount fs/namespace.c:3591 [inline]
 __se_sys_mount+0x2e3/0x3d0 fs/namespace.c:3568
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Last potentially related work creation:
 kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38
 __kasan_record_aux_stack+0xaf/0xc0 mm/kasan/generic.c:348
 call_rcu+0x163/0x9c0 kernel/rcu/tree.c:2796
 nilfs_put_root+0x93/0xb0 fs/nilfs2/the_nilfs.c:802
 nilfs_segctor_destroy fs/nilfs2/segment.c:2747 [inline]
 nilfs_detach_log_writer+0x8f3/0xbf0 fs/nilfs2/segment.c:2810
 nilfs_put_super+0x4b/0x150 fs/nilfs2/super.c:468
 generic_shutdown_super+0x130/0x310 fs/super.c:491
 kill_block_super+0x79/0xd0 fs/super.c:1427
 deactivate_locked_super+0xa7/0xf0 fs/super.c:331
 cleanup_mnt+0x4ce/0x560 fs/namespace.c:1186
 task_work_run+0x146/0x1c0 kernel/task_work.c:177
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0x134/0x160 kernel/entry/common.c:169
 exit_to_user_mode_prepare+0xad/0x110 kernel/entry/common.c:201
 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline]
 syscall_exit_to_user_mode+0x2e/0x60 kernel/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Second to last potentially related work creation:
 kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38
 __kasan_record_aux_stack+0xaf/0xc0 mm/kasan/generic.c:348
 call_rcu+0x163/0x9c0 kernel/rcu/tree.c:2796
 nilfs_put_root+0x93/0xb0 fs/nilfs2/the_nilfs.c:802
 nilfs_segctor_destroy fs/nilfs2/segment.c:2747 [inline]
 nilfs_detach_log_writer+0x8f3/0xbf0 fs/nilfs2/segment.c:2810
 nilfs_put_super+0x4b/0x150 fs/nilfs2/super.c:468
 generic_shutdown_super+0x130/0x310 fs/super.c:491
 kill_block_super+0x79/0xd0 fs/super.c:1427
 deactivate_locked_super+0xa7/0xf0 fs/super.c:331
 cleanup_mnt+0x4ce/0x560 fs/namespace.c:1186
 task_work_run+0x146/0x1c0 kernel/task_work.c:177
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0x134/0x160 kernel/entry/common.c:169
 exit_to_user_mode_prepare+0xad/0x110 kernel/entry/common.c:201
 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline]
 syscall_exit_to_user_mode+0x2e/0x60 kernel/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

The buggy address belongs to the object at ffff888074b02cd8
 which belongs to the cache nilfs2_inode_cache of size 1512
The buggy address is located 105 bytes to the right of
 1512-byte region [ffff888074b02cd8, ffff888074b032c0)

The buggy address belongs to the physical page:
page:ffffea0001d2c000 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888074b06018 pfn:0x74b00
head:ffffea0001d2c000 order:3 compound_mapcount:0 compound_pincount:0
memcg:ffff888026dabd01
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 0000000000000000 dead000000000122 ffff888146d45500
raw: ffff888074b06018 0000000080130011 00000001ffffffff ffff888026dabd01
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Reclaimable, gfp_mask 0x1d2050(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL|__GFP_RECLAIMABLE), pid 14578, tgid 14576 (syz-executor.4), ts 770607062834, free_ts 666442761743
 prep_new_page mm/page_alloc.c:2532 [inline]
 get_page_from_freelist+0x72b/0x7a0 mm/page_alloc.c:4283
 __alloc_pages+0x259/0x560 mm/page_alloc.c:5549
 alloc_slab_page+0x70/0xf0 mm/slub.c:1829
 allocate_slab+0x5e/0x520 mm/slub.c:1974
 new_slab mm/slub.c:2034 [inline]
 ___slab_alloc+0x42e/0xce0 mm/slub.c:3036
 __slab_alloc mm/slub.c:3123 [inline]
 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+0x225/0x2d0 mm/slub.c:3280
 alloc_inode_sb include/linux/fs.h:3107 [inline]
 nilfs_alloc_inode+0x27/0xe0 fs/nilfs2/super.c:154
 alloc_inode fs/inode.c:259 [inline]
 iget5_locked+0x9c/0x270 fs/inode.c:1241
 nilfs_iget_locked+0x160/0x1f0 fs/nilfs2/inode.c:588
 nilfs_dat_read+0xbd/0x300 fs/nilfs2/dat.c:483
 nilfs_load_super_root fs/nilfs2/the_nilfs.c:120 [inline]
 load_nilfs+0x51e/0xfe0 fs/nilfs2/the_nilfs.c:269
 nilfs_fill_super+0x2c8/0x650 fs/nilfs2/super.c:1059
 nilfs_mount+0x673/0x9e0 fs/nilfs2/super.c:1317
 legacy_get_tree+0xea/0x180 fs/fs_context.c:610
 vfs_get_tree+0x88/0x270 fs/super.c:1530
 do_new_mount+0x289/0xad0 fs/namespace.c:3040
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+0x812/0x900 mm/page_alloc.c:1499
 free_unref_page_prepare mm/page_alloc.c:3380 [inline]
 free_unref_page+0x7d/0x630 mm/page_alloc.c:3476
 qlist_free_all+0x2b/0x70 mm/kasan/quarantine.c:187
 kasan_quarantine_reduce+0x169/0x180 mm/kasan/quarantine.c:294
 __kasan_slab_alloc+0x2f/0xe0 mm/kasan/common.c:447
 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+0x1a6/0x310 mm/slub.c:3273
 getname_flags+0xb8/0x4e0 fs/namei.c:139
 vfs_fstatat fs/stat.c:266 [inline]
 __do_sys_newfstatat fs/stat.c:437 [inline]
 __se_sys_newfstatat+0xe2/0x7b0 fs/stat.c:431
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Memory state around the buggy address:
 ffff888074b03200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888074b03280: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
>ffff888074b03300: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00
                                  ^
 ffff888074b03380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888074b03400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================

Crashes (6):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce-smack-root 2022/10/18 02:29 upstream 55be6084c8e0 754863b4 .config log report info KASAN: slab-out-of-bounds Read in load_system_files
ci2-upstream-fs 2022/10/15 08:17 upstream 493ffd6605b2 67cb024c .config log report info KASAN: slab-out-of-bounds Read in load_system_files
ci2-upstream-fs 2022/10/12 07:49 upstream 493ffd6605b2 02b6492e .config log report info KASAN: slab-out-of-bounds Read in load_system_files
ci2-upstream-fs 2022/10/10 09:00 upstream 4899a36f91a9 aea5da89 .config log report info KASAN: slab-out-of-bounds Read in load_system_files
ci2-upstream-fs 2022/10/10 05:13 upstream 4899a36f91a9 aea5da89 .config log report info KASAN: slab-out-of-bounds Read in load_system_files
ci2-upstream-fs 2022/10/04 10:43 upstream 4fe89d07dcc2 978d1f19 .config log report info KASAN: slab-out-of-bounds Read in load_system_files
* Struck through repros no longer work on HEAD.