KASAN: use-after-free Read in hfsplus_release_folio

Status: fixed on 2023/04/11 15:30
Reported-by: syzbot+5ccc44d06857c4e9364e@syzkaller.appspotmail.com
Fix commit: 0c80bef0b7d2 fs: hfsplus: fix UAF issue in hfsplus_put_super
First crash: 1293d, last: 1293d
Fix bisection: fixed by (bisect log) :
commit 0c80bef0b7d297ea86e5408fe79c45479e504a26
Author: Dongliang Mu <mudongliangabcd@gmail.com>
Date: Sun Feb 26 12:49:47 2023 +0000

  fs: hfsplus: fix UAF issue in hfsplus_put_super

  
▶ ▼ Similar bugs (2)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KASAN: use-after-free Read in hfsplus_release_folio hfs 19 syz, C error 23 1300d 1375d 22/29 fixed on 2023/06/08 14:41
upstream KASAN: slab-use-after-free Read in hfsplus_release_folio hfs 19 1 1100d 1096d 0/29 auto-obsoleted due to no activity on 2023/12/17 10:59

Sample crash report:
loop0: detected capacity change from 0 to 1024
==================================================================
BUG: KASAN: use-after-free in hfsplus_release_folio+0x410/0x4ac fs/hfsplus/inode.c:92
Read of size 4 at addr ffff0000d833e038 by task syz-executor954/4307

CPU: 0 PID: 4307 Comm: syz-executor954 Not tainted 6.1.15-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
Call trace:
 dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:284 [inline]
 print_report+0x178/0x4e0 mm/kasan/report.c:395
 kasan_report+0xd4/0x130 mm/kasan/report.c:495
 __asan_report_load4_noabort+0x2c/0x38 mm/kasan/report_generic.c:350
 hfsplus_release_folio+0x410/0x4ac fs/hfsplus/inode.c:92
 filemap_release_folio+0x144/0x30c mm/filemap.c:3949
 block_invalidate_folio+0x4c4/0x814 fs/buffer.c:1526
 folio_invalidate mm/truncate.c:159 [inline]
 truncate_cleanup_folio+0x180/0x4c0 mm/truncate.c:179
 truncate_inode_pages_range+0x288/0x13b0 mm/truncate.c:369
 truncate_inode_pages mm/truncate.c:452 [inline]
 truncate_inode_pages_final+0x90/0xc0 mm/truncate.c:487
 hfsplus_evict_inode+0x2c/0xc0 fs/hfsplus/super.c:168
 evict+0x260/0x68c fs/inode.c:664
 iput_final fs/inode.c:1747 [inline]
 iput+0x968/0xa4c fs/inode.c:1773
 hfsplus_put_super+0x1b0/0x2ec fs/hfsplus/super.c:302
 generic_shutdown_super+0x130/0x2f0 fs/super.c:492
 kill_block_super+0x70/0xdc fs/super.c:1428
 deactivate_locked_super+0xac/0x124 fs/super.c:332
 deactivate_super+0xf0/0x110 fs/super.c:363
 cleanup_mnt+0x394/0x41c fs/namespace.c:1186
 __cleanup_mnt+0x20/0x30 fs/namespace.c:1193
 task_work_run+0x240/0x2f0 kernel/task_work.c:179
 exit_task_work include/linux/task_work.h:38 [inline]
 do_exit+0x538/0x1af8 kernel/exit.c:867
 do_group_exit+0x194/0x22c kernel/exit.c:1012
 __do_sys_exit_group kernel/exit.c:1023 [inline]
 __se_sys_exit_group kernel/exit.c:1021 [inline]
 __wake_up_parent+0x0/0x60 kernel/exit.c:1021
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206
 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581

Allocated by task 4307:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4c/0x80 mm/kasan/common.c:52
 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:505
 ____kasan_kmalloc mm/kasan/common.c:374 [inline]
 __kasan_kmalloc+0xac/0xc4 mm/kasan/common.c:383
 kasan_kmalloc include/linux/kasan.h:211 [inline]
 kmalloc_trace+0x7c/0x94 mm/slab_common.c:1050
 kmalloc include/linux/slab.h:553 [inline]
 kzalloc include/linux/slab.h:689 [inline]
 hfsplus_btree_open+0x6c/0xd00 fs/hfsplus/btree.c:142
 hfsplus_fill_super+0x910/0x166c fs/hfsplus/super.c:485
 mount_bdev+0x26c/0x368 fs/super.c:1401
 hfsplus_mount+0x44/0x58 fs/hfsplus/super.c:641
 legacy_get_tree+0xd4/0x16c fs/fs_context.c:610
 vfs_get_tree+0x90/0x274 fs/super.c:1531
 do_new_mount+0x25c/0x8c8 fs/namespace.c:3040
 path_mount+0x590/0xe58 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]
 __arm64_sys_mount+0x45c/0x594 fs/namespace.c:3568
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206
 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581

Freed by task 4307:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4c/0x80 mm/kasan/common.c:52
 kasan_save_free_info+0x38/0x5c mm/kasan/generic.c:516
 ____kasan_slab_free+0x144/0x20c mm/kasan/common.c:236
 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:244
 kasan_slab_free include/linux/kasan.h:177 [inline]
 slab_free_hook mm/slub.c:1724 [inline]
 slab_free_freelist_hook mm/slub.c:1750 [inline]
 slab_free mm/slub.c:3661 [inline]
 __kmem_cache_free+0x2c0/0x500 mm/slub.c:3674
 kfree+0x104/0x268 mm/slab_common.c:1007
 hfsplus_btree_close+0x25c/0x288 fs/hfsplus/btree.c:280
 hfsplus_put_super+0x140/0x2ec fs/hfsplus/super.c:298
 generic_shutdown_super+0x130/0x2f0 fs/super.c:492
 kill_block_super+0x70/0xdc fs/super.c:1428
 deactivate_locked_super+0xac/0x124 fs/super.c:332
 deactivate_super+0xf0/0x110 fs/super.c:363
 cleanup_mnt+0x394/0x41c fs/namespace.c:1186
 __cleanup_mnt+0x20/0x30 fs/namespace.c:1193
 task_work_run+0x240/0x2f0 kernel/task_work.c:179
 exit_task_work include/linux/task_work.h:38 [inline]
 do_exit+0x538/0x1af8 kernel/exit.c:867
 do_group_exit+0x194/0x22c kernel/exit.c:1012
 __do_sys_exit_group kernel/exit.c:1023 [inline]
 __se_sys_exit_group kernel/exit.c:1021 [inline]
 __wake_up_parent+0x0/0x60 kernel/exit.c:1021
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206
 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581

The buggy address belongs to the object at ffff0000d833e000
 which belongs to the cache kmalloc-4k of size 4096
The buggy address is located 56 bytes inside of
 4096-byte region [ffff0000d833e000, ffff0000d833f000)

The buggy address belongs to the physical page:
page:00000000386b5da6 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x118338
head:00000000386b5da6 order:3 compound_mapcount:0 compound_pincount:0
flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000010200 0000000000000000 dead000000000122 ffff0000c0002a80
raw: 0000000000000000 0000000000040004 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000d833df00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff0000d833df80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff0000d833e000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                        ^
 ffff0000d833e080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff0000d833e100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/03/09 11:39 linux-6.1.y 42616e0f09fb f08b59ac .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-1-kasan-arm64 KASAN: use-after-free Read in hfsplus_release_folio
2023/03/09 08:16 linux-6.1.y 42616e0f09fb f08b59ac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: use-after-free Read in hfsplus_release_folio
* Struck through repros no longer work on HEAD.