KASAN: use-after-free Read in hfsplus_releasepage

Status: fixed on 2023/04/11 15:29
Reported-by: syzbot+ca08526be49ab156e8b8@syzkaller.appspotmail.com
Fix commit: 05103d88482d fs: hfsplus: fix UAF issue in hfsplus_put_super
First crash: 1268d, last: 1268d
Fix bisection: fixed by (bisect log) :
commit 05103d88482dc3757db108415342fdd86821a79b
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
linux-4.14 KASAN: use-after-free Read in hfsplus_releasepage 19 syz, C 2 1275d 1361d 0/1 upstream: reported C repro on 2022/12/06 16:30
linux-4.19 KASAN: use-after-free Read in hfsplus_releasepage hfsplus 19 syz, C error 2 1351d 1368d 0/1 upstream: reported C repro on 2022/11/29 13:07

Sample crash report:
loop0: detected capacity change from 0 to 1024
==================================================================
BUG: KASAN: use-after-free in hfsplus_releasepage+0x40c/0x4a8 fs/hfsplus/inode.c:92
Read of size 4 at addr ffff0000da23e038 by task syz-executor939/4052

CPU: 0 PID: 4052 Comm: syz-executor939 Not tainted 5.15.98-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
Call trace:
 dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
 print_address_description+0x7c/0x3f0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:434 [inline]
 kasan_report+0x174/0x1e4 mm/kasan/report.c:451
 __asan_report_load4_noabort+0x44/0x50 mm/kasan/report_generic.c:308
 hfsplus_releasepage+0x40c/0x4a8 fs/hfsplus/inode.c:92
 try_to_release_page+0x204/0x2d0 mm/filemap.c:3970
 block_invalidatepage+0x408/0x4bc fs/buffer.c:1545
 do_invalidatepage mm/truncate.c:157 [inline]
 truncate_cleanup_page+0x15c/0x414 mm/truncate.c:176
 truncate_inode_pages_range+0x254/0xbe0 mm/truncate.c:325
 truncate_inode_pages mm/truncate.c:425 [inline]
 truncate_inode_pages_final+0x94/0xd0 mm/truncate.c:464
 hfsplus_evict_inode+0x2c/0xc0 fs/hfsplus/super.c:168
 evict+0x260/0x68c fs/inode.c:587
 iput_final fs/inode.c:1663 [inline]
 iput+0x8cc/0x9ac fs/inode.c:1689
 hfsplus_put_super+0x1b0/0x2ec fs/hfsplus/super.c:302
 generic_shutdown_super+0x130/0x29c fs/super.c:466
 kill_block_super+0x70/0xdc fs/super.c:1396
 deactivate_locked_super+0xb8/0x13c fs/super.c:335
 deactivate_super+0x108/0x128 fs/super.c:366
 cleanup_mnt+0x3c0/0x474 fs/namespace.c:1143
 __cleanup_mnt+0x20/0x30 fs/namespace.c:1150
 task_work_run+0x130/0x1e4 kernel/task_work.c:164
 exit_task_work include/linux/task_work.h:32 [inline]
 do_exit+0x55c/0x1c20 kernel/exit.c:872
 do_group_exit+0x110/0x268 kernel/exit.c:994
 __do_sys_exit_group kernel/exit.c:1005 [inline]
 __se_sys_exit_group kernel/exit.c:1003 [inline]
 __wake_up_parent+0x0/0x60 kernel/exit.c:1003
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:596
 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:614
 el0t_64_sync+0x1a0/0x1a4 <unknown>:584

Allocated by task 4052:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:434 [inline]
 ____kasan_kmalloc+0xbc/0xfc mm/kasan/common.c:513
 __kasan_kmalloc+0x10/0x1c mm/kasan/common.c:522
 kasan_kmalloc include/linux/kasan.h:264 [inline]
 kmem_cache_alloc_trace+0x248/0x3b4 mm/slub.c:3247
 kmalloc include/linux/slab.h:591 [inline]
 kzalloc include/linux/slab.h:721 [inline]
 hfsplus_btree_open+0x6c/0xd10 fs/hfsplus/btree.c:142
 hfsplus_fill_super+0x914/0x167c fs/hfsplus/super.c:485
 mount_bdev+0x26c/0x368 fs/super.c:1369
 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:1499
 do_new_mount+0x25c/0x8c8 fs/namespace.c:2994
 path_mount+0x590/0x104c fs/namespace.c:3324
 do_mount fs/namespace.c:3337 [inline]
 __do_sys_mount fs/namespace.c:3545 [inline]
 __se_sys_mount fs/namespace.c:3522 [inline]
 __arm64_sys_mount+0x510/0x5e0 fs/namespace.c:3522
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:596
 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:614
 el0t_64_sync+0x1a0/0x1a4 <unknown>:584

Freed by task 4052:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track+0x4c/0x84 mm/kasan/common.c:46
 kasan_set_free_info+0x28/0x4c mm/kasan/generic.c:360
 ____kasan_slab_free+0x118/0x164 mm/kasan/common.c:366
 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:374
 kasan_slab_free include/linux/kasan.h:230 [inline]
 slab_free_hook mm/slub.c:1705 [inline]
 slab_free_freelist_hook+0x128/0x1ec mm/slub.c:1731
 slab_free mm/slub.c:3499 [inline]
 kfree+0x1a8/0x478 mm/slub.c:4559
 hfsplus_btree_close+0x25c/0x288 fs/hfsplus/btree.c:279
 hfsplus_put_super+0x140/0x2ec fs/hfsplus/super.c:298
 generic_shutdown_super+0x130/0x29c fs/super.c:466
 kill_block_super+0x70/0xdc fs/super.c:1396
 deactivate_locked_super+0xb8/0x13c fs/super.c:335
 deactivate_super+0x108/0x128 fs/super.c:366
 cleanup_mnt+0x3c0/0x474 fs/namespace.c:1143
 __cleanup_mnt+0x20/0x30 fs/namespace.c:1150
 task_work_run+0x130/0x1e4 kernel/task_work.c:164
 exit_task_work include/linux/task_work.h:32 [inline]
 do_exit+0x55c/0x1c20 kernel/exit.c:872
 do_group_exit+0x110/0x268 kernel/exit.c:994
 __do_sys_exit_group kernel/exit.c:1005 [inline]
 __se_sys_exit_group kernel/exit.c:1003 [inline]
 __wake_up_parent+0x0/0x60 kernel/exit.c:1003
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:596
 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:614
 el0t_64_sync+0x1a0/0x1a4 <unknown>:584

The buggy address belongs to the object at ffff0000da23e000
 which belongs to the cache kmalloc-4k of size 4096
The buggy address is located 56 bytes inside of
 4096-byte region [ffff0000da23e000, ffff0000da23f000)
The buggy address belongs to the page:
page:00000000805e355b refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11a238
head:00000000805e355b 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:
 ffff0000da23df00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff0000da23df80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff0000da23e000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                        ^
 ffff0000da23e080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff0000da23e100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/03/09 12:52 linux-5.15.y d9b4a0c83a2d f08b59ac .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan-arm64 KASAN: use-after-free Read in hfsplus_releasepage
* Struck through repros no longer work on HEAD.