syzbot


KASAN: use-after-free Read in hfsplus_btree_open

Status: upstream: reported on 2022/12/05 09:47
Reported-by: syzbot+8d39c1e195e443de0dfe@syzkaller.appspotmail.com
First crash: 64d, last: 54d

Sample crash report:
==================================================================
BUG: KASAN: use-after-free in hfsplus_btree_open+0xb97/0xcd0 fs/hfsplus/btree.c:155
Read of size 4 at addr ffff888070e9c554 by task syz-executor.3/24287

CPU: 0 PID: 24287 Comm: syz-executor.3 Not tainted 6.1.0-syzkaller-00071-g3a28c2c89f4b #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+0xd1/0x138 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:284 [inline]
 print_report+0x15e/0x45d mm/kasan/report.c:395
 kasan_report+0xbf/0x1f0 mm/kasan/report.c:495
 hfsplus_btree_open+0xb97/0xcd0 fs/hfsplus/btree.c:155
 hfsplus_fill_super+0xae5/0x1a30 fs/hfsplus/super.c:473
 mount_bdev+0x351/0x410 fs/super.c:1401
 legacy_get_tree+0x109/0x220 fs/fs_context.c:610
 vfs_get_tree+0x8d/0x2f0 fs/super.c:1531
 do_new_mount fs/namespace.c:3040 [inline]
 path_mount+0x132a/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+0x283/0x300 fs/namespace.c:3568
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f989768d60a
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:00007f98983b9f88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000612 RCX: 00007f989768d60a
RDX: 00000000200000c0 RSI: 0000000020000640 RDI: 00007f98983b9fe0
RBP: 00007f98983ba020 R08: 00007f98983ba020 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 00000000200000c0
R13: 0000000020000640 R14: 00007f98983b9fe0 R15: 0000000020000280
 </TASK>

Allocated by task 15336:
 kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
 kasan_set_track+0x25/0x30 mm/kasan/common.c:52
 __kasan_slab_alloc+0x82/0x90 mm/kasan/common.c:325
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook mm/slab.h:737 [inline]
 slab_alloc_node mm/slub.c:3398 [inline]
 slab_alloc mm/slub.c:3406 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3413 [inline]
 kmem_cache_alloc_lru+0x35b/0x740 mm/slub.c:3429
 alloc_inode_sb include/linux/fs.h:3125 [inline]
 f2fs_alloc_inode+0xfe/0x5d0 fs/f2fs/super.c:1366
 alloc_inode+0x61/0x230 fs/inode.c:259
 iget_locked+0x1bb/0x700 fs/inode.c:1286
 f2fs_iget+0x5d/0x5770 fs/f2fs/inode.c:505
 f2fs_fill_super+0x3d66/0x77a0 fs/f2fs/super.c:4333
 mount_bdev+0x351/0x410 fs/super.c:1401
 legacy_get_tree+0x109/0x220 fs/fs_context.c:610
 vfs_get_tree+0x8d/0x2f0 fs/super.c:1531
 do_new_mount fs/namespace.c:3040 [inline]
 path_mount+0x132a/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+0x283/0x300 fs/namespace.c:3568
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Last potentially related work creation:
 kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:481
 __call_rcu_common.constprop.0+0x99/0x820 kernel/rcu/tree.c:2753
 destroy_inode+0x129/0x1b0 fs/inode.c:314
 iput_final fs/inode.c:1747 [inline]
 iput.part.0+0x59b/0x880 fs/inode.c:1773
 iput+0x5c/0x80 fs/inode.c:1763
 f2fs_fill_super+0x4502/0x77a0 fs/f2fs/super.c:4516
 mount_bdev+0x351/0x410 fs/super.c:1401
 legacy_get_tree+0x109/0x220 fs/fs_context.c:610
 vfs_get_tree+0x8d/0x2f0 fs/super.c:1531
 do_new_mount fs/namespace.c:3040 [inline]
 path_mount+0x132a/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+0x283/0x300 fs/namespace.c:3568
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Second to last potentially related work creation:
 kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:481
 __call_rcu_common.constprop.0+0x99/0x820 kernel/rcu/tree.c:2753
 destroy_inode+0x129/0x1b0 fs/inode.c:314
 iput_final fs/inode.c:1747 [inline]
 iput.part.0+0x59b/0x880 fs/inode.c:1773
 iput+0x5c/0x80 fs/inode.c:1763
 f2fs_put_super+0x4bb/0xc10 fs/f2fs/super.c:1599
 generic_shutdown_super+0x158/0x410 fs/super.c:492
 kill_block_super+0x9b/0xf0 fs/super.c:1428
 kill_f2fs_super+0x2af/0x3c0 fs/f2fs/super.c:4612
 deactivate_locked_super+0x98/0x160 fs/super.c:332
 deactivate_super+0xb1/0xd0 fs/super.c:363
 cleanup_mnt+0x2ae/0x3d0 fs/namespace.c:1186
 task_work_run+0x16f/0x270 kernel/task_work.c:179
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:171 [inline]
 exit_to_user_mode_prepare+0x23c/0x250 kernel/entry/common.c:203
 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
 syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:296
 do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

The buggy address belongs to the object at ffff888070e9be20
 which belongs to the cache f2fs_inode_cache of size 2144
The buggy address is located 1844 bytes inside of
 2144-byte region [ffff888070e9be20, ffff888070e9c680)

The buggy address belongs to the physical page:
page:ffffea0001c3a600 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888070e988e0 pfn:0x70e98
head:ffffea0001c3a600 order:3 compound_mapcount:0 compound_pincount:0
memcg:ffff88804af92501
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 0000000000000000 dead000000000122 ffff888146e08b40
raw: ffff888070e988e0 00000000800e000a 00000001ffffffff ffff88804af92501
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 5217, tgid 5214 (syz-executor.5), ts 245289153646, free_ts 244258337832
 prep_new_page mm/page_alloc.c:2539 [inline]
 get_page_from_freelist+0x10b5/0x2d50 mm/page_alloc.c:4291
 __alloc_pages+0x1cb/0x5b0 mm/page_alloc.c:5558
 alloc_pages+0x1aa/0x270 mm/mempolicy.c:2285
 alloc_slab_page mm/slub.c:1794 [inline]
 allocate_slab+0x25f/0x350 mm/slub.c:1939
 new_slab mm/slub.c:1992 [inline]
 ___slab_alloc+0xa91/0x1400 mm/slub.c:3180
 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3279
 slab_alloc_node mm/slub.c:3364 [inline]
 slab_alloc mm/slub.c:3406 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3413 [inline]
 kmem_cache_alloc_lru+0x4b1/0x740 mm/slub.c:3429
 alloc_inode_sb include/linux/fs.h:3125 [inline]
 f2fs_alloc_inode+0xfe/0x5d0 fs/f2fs/super.c:1366
 alloc_inode+0x61/0x230 fs/inode.c:259
 iget_locked+0x1bb/0x700 fs/inode.c:1286
 f2fs_iget+0x5d/0x5770 fs/f2fs/inode.c:505
 f2fs_fill_super+0x3ddc/0x77a0 fs/f2fs/super.c:4341
 mount_bdev+0x351/0x410 fs/super.c:1401
 legacy_get_tree+0x109/0x220 fs/fs_context.c:610
 vfs_get_tree+0x8d/0x2f0 fs/super.c:1531
 do_new_mount fs/namespace.c:3040 [inline]
 path_mount+0x132a/0x1e20 fs/namespace.c:3370
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+0x65c/0xd90 mm/page_alloc.c:1509
 free_unref_page_prepare mm/page_alloc.c:3387 [inline]
 free_unref_page+0x1d/0x4d0 mm/page_alloc.c:3483
 qlink_free mm/kasan/quarantine.c:168 [inline]
 qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187
 kasan_quarantine_reduce+0x192/0x220 mm/kasan/quarantine.c:294
 __kasan_slab_alloc+0x66/0x90 mm/kasan/common.c:302
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook mm/slab.h:737 [inline]
 slab_alloc_node mm/slub.c:3398 [inline]
 slab_alloc mm/slub.c:3406 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3413 [inline]
 kmem_cache_alloc+0x1b7/0x3d0 mm/slub.c:3422
 getname_flags.part.0+0x50/0x4f0 fs/namei.c:139
 getname_flags+0x9e/0xe0 include/linux/audit.h:320
 user_path_at_empty+0x2f/0x60 fs/namei.c:2875
 user_path_at include/linux/namei.h:57 [inline]
 ksys_umount fs/namespace.c:1822 [inline]
 __do_sys_umount fs/namespace.c:1830 [inline]
 __se_sys_umount fs/namespace.c:1828 [inline]
 __x64_sys_umount+0xfc/0x190 fs/namespace.c:1828
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Memory state around the buggy address:
 ffff888070e9c400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888070e9c480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888070e9c500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                 ^
 ffff888070e9c580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888070e9c600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

Crashes (3):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets Title
ci-upstream-kasan-gce-root 2022/12/13 03:08 upstream 3a28c2c89f4b 67be1ae7 .config console log report info [disk image] [vmlinux] [kernel image] KASAN: use-after-free Read in hfsplus_btree_open
ci2-upstream-fs 2022/12/13 01:38 upstream 830b3c68c1fb 67be1ae7 .config console log report info [disk image] [vmlinux] [kernel image] KASAN: use-after-free Read in hfsplus_btree_open
ci2-upstream-fs 2022/12/02 13:58 upstream a4412fdd49dc e080de16 .config console log report info [disk image] [vmlinux] [kernel image] KASAN: use-after-free Read in hfsplus_btree_open
* Struck through repros no longer work on HEAD.