syzbot


KASAN: use-after-free Read in ntfs_read_folio

Status: upstream: reported C repro on 2023/03/17 16:24
Labels: ntfs (incorrect?)
Reported-by: syzbot+d3cd38158cd7c8d1432c@syzkaller.appspotmail.com
First crash: 75d, last: 5d09h

Cause bisection: failed (error log, bisect log)
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [ntfs?] KASAN: use-after-free Read in ntfs_read_folio 0 (1) 2023/03/17 16:24
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 KASAN: use-after-free Read in ntfs_read_folio origin:upstream C 2 24d 74d 0/3 upstream: reported C repro on 2023/03/18 10:25
Fix bisection attempts (2)
Created Duration User Patch Repo Result
2023/05/26 16:33 49m bisect fix upstream job log (0) log
2023/04/16 20:12 45m bisect fix upstream job log (0) log

Sample crash report:
ntfs: (device loop0): load_system_files(): Failed to load $MFTMirr.  Mounting read-only.  Run ntfsfix and/or chkdsk.
ntfs: (device loop0): ntfs_external_attr_find(): Base inode 0xa contains corrupt attribute list attribute. Unmount and run chkdsk.
ntfs: (device loop0): ntfs_read_locked_inode(): Failed to lookup $DATA attribute.
ntfs: (device loop0): ntfs_read_locked_inode(): Failed with error code -5.  Marking corrupt inode 0xa as bad.  Run chkdsk.
ntfs: (device loop0): load_and_init_upcase(): Failed to load $UpCase from the volume. Using default.
==================================================================
BUG: KASAN: use-after-free in ntfs_read_folio+0x9bc/0x29f0 fs/ntfs/aops.c:489
Read of size 1 at addr ffff88807345e17f by task syz-executor870/5075

CPU: 0 PID: 5075 Comm: syz-executor870 Not tainted 6.3.0-rc2-syzkaller-00077-g38e04b3e4240 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:319 [inline]
 print_report+0x163/0x540 mm/kasan/report.c:430
 kasan_report+0x176/0x1b0 mm/kasan/report.c:536
 kasan_check_range+0x283/0x290 mm/kasan/generic.c:187
 __asan_memcpy+0x29/0x70 mm/kasan/shadow.c:105
 ntfs_read_folio+0x9bc/0x29f0 fs/ntfs/aops.c:489
 filemap_read_folio+0x19d/0x7a0 mm/filemap.c:2424
 do_read_cache_folio+0x2ee/0x820 mm/filemap.c:3683
 do_read_cache_page+0x32/0x230 mm/filemap.c:3749
 read_mapping_page include/linux/pagemap.h:769 [inline]
 ntfs_map_page fs/ntfs/aops.h:75 [inline]
 load_and_init_attrdef fs/ntfs/super.c:1617 [inline]
 load_system_files+0x1c0b/0x4840 fs/ntfs/super.c:1825
 ntfs_fill_super+0x19b4/0x2bd0 fs/ntfs/super.c:2900
 mount_bdev+0x271/0x3a0 fs/super.c:1371
 legacy_get_tree+0xef/0x190 fs/fs_context.c:610
 vfs_get_tree+0x8c/0x270 fs/super.c:1501
 do_new_mount+0x28f/0xae0 fs/namespace.c:3042
 do_mount fs/namespace.c:3385 [inline]
 __do_sys_mount fs/namespace.c:3594 [inline]
 __se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3571
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f1aca4b2d1a
Code: 48 c7 c2 c0 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 a8 00 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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffcc0f252b8 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000555555e2d2c0 RCX: 00007f1aca4b2d1a
RDX: 0000000020000040 RSI: 000000002001f200 RDI: 00007ffcc0f25300
RBP: 0000000000000000 R08: 00007ffcc0f25340 R09: 0000000000000978
R10: 0000000000000000 R11: 0000000000000286 R12: 0000000000000004
R13: 00007ffcc0f25340 R14: 0000000000000003 R15: 00007ffcc0f25300
 </TASK>

The buggy address belongs to the physical page:
page:ffffea0001cd1780 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x7345e
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 ffffea0001cd17c8 ffffea0001cd1748 0000000000000000
raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Movable, gfp_mask 0x140dca(GFP_HIGHUSER_MOVABLE|__GFP_COMP|__GFP_ZERO), pid 5066, tgid 5066 (sshd), ts 46590455458, free_ts 46593964562
 prep_new_page mm/page_alloc.c:2552 [inline]
 get_page_from_freelist+0x3246/0x33c0 mm/page_alloc.c:4325
 __alloc_pages+0x255/0x670 mm/page_alloc.c:5591
 __folio_alloc+0x13/0x30 mm/page_alloc.c:5623
 vma_alloc_folio+0x48a/0x9a0 mm/mempolicy.c:2244
 do_anonymous_page mm/memory.c:4052 [inline]
 handle_pte_fault mm/memory.c:4907 [inline]
 __handle_mm_fault mm/memory.c:5051 [inline]
 handle_mm_fault+0x2984/0x51c0 mm/memory.c:5197
 do_user_addr_fault arch/x86/mm/fault.c:1407 [inline]
 handle_page_fault arch/x86/mm/fault.c:1498 [inline]
 exc_page_fault+0x5b1/0x7c0 arch/x86/mm/fault.c:1554
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1453 [inline]
 free_pcp_prepare mm/page_alloc.c:1503 [inline]
 free_unref_page_prepare+0xe2f/0xe70 mm/page_alloc.c:3387
 free_unref_page_list+0x596/0x830 mm/page_alloc.c:3528
 release_pages+0x219e/0x2470 mm/swap.c:1042
 tlb_batch_pages_flush mm/mmu_gather.c:97 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:292 [inline]
 tlb_flush_mmu+0x100/0x210 mm/mmu_gather.c:299
 tlb_finish_mmu+0xd4/0x1f0 mm/mmu_gather.c:391
 unmap_region+0x253/0x2a0 mm/mmap.c:2146
 do_vmi_align_munmap+0xba3/0x1200 mm/mmap.c:2395
 do_vmi_munmap+0x24a/0x2b0 mm/mmap.c:2452
 __vm_munmap+0x200/0x310 mm/mmap.c:2731
 __do_sys_munmap mm/mmap.c:2756 [inline]
 __se_sys_munmap mm/mmap.c:2753 [inline]
 __x64_sys_munmap+0x60/0x70 mm/mmap.c:2753
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Memory state around the buggy address:
 ffff88807345e000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88807345e080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88807345e100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                                                ^
 ffff88807345e180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88807345e200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets Manager Title
2023/03/17 19:42 upstream 38e04b3e4240 7939252e .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs KASAN: use-after-free Read in ntfs_read_folio
2023/03/17 15:39 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci fe15c26ee26e 18b58603 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-gce-arm64 KASAN: use-after-free Read in ntfs_read_folio
2023/03/17 15:26 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci fe15c26ee26e 18b58603 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 KASAN: use-after-free Read in ntfs_read_folio
* Struck through repros no longer work on HEAD.