KMSAN: uninit-value in ntfs_read_hdr (2)

Status: auto-obsoleted due to no activity on 2025/08/06 10:39
Subsystems: ntfs3
[Documentation on labels]
Reported-by: syzbot+488af4b73b8ab6ed0f27@syzkaller.appspotmail.com
First crash: 472d, last: 472d
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [ntfs3?] KMSAN: uninit-value in ntfs_read_hdr (2) 0 (1) 2025/05/02 10:43
▶ ▼ Similar bugs (4)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KMSAN: uninit-value in ntfs_read_hdr (4) ntfs3 7 3 195d 205d 0/29 auto-obsoleted due to no activity on 2026/05/10 14:12
upstream KMSAN: uninit-value in ntfs_read_hdr (3) ntfs3 7 syz, C 6 223d 329d 29/29 fixed on 2026/01/07 12:29
upstream KMSAN: uninit-value in ntfs_read_hdr ntfs3 7 15 586d 641d 0/29 auto-obsoleted due to no activity on 2025/03/15 12:38
upstream KASAN: slab-use-after-free Read in ntfs_read_hdr actionable prio:high ntfs3 19 2 84d 73d 0/29 upstream: reported on 2026/06/01 20:12

Sample crash report:
=====================================================
BUG: KMSAN: uninit-value in ntfs_dir_emit fs/ntfs3/dir.c:333 [inline]
BUG: KMSAN: uninit-value in ntfs_read_hdr+0x105a/0x1370 fs/ntfs3/dir.c:383
 ntfs_dir_emit fs/ntfs3/dir.c:333 [inline]
 ntfs_read_hdr+0x105a/0x1370 fs/ntfs3/dir.c:383
 ntfs_readdir+0xf21/0x1a30 fs/ntfs3/dir.c:494
 iterate_dir+0x716/0x920 fs/readdir.c:108
 __do_sys_getdents64 fs/readdir.c:403 [inline]
 __se_sys_getdents64+0x17e/0x550 fs/readdir.c:389
 __x64_sys_getdents64+0x97/0xe0 fs/readdir.c:389
 x64_sys_call+0x16c4/0x3db0 arch/x86/include/generated/asm/syscalls_64.h:218
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd9/0x1b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was stored to memory at:
 ntfs_read_run_nb+0x7cf/0x1810 fs/ntfs3/fsntfs.c:1228
 ntfs_read_bh+0x6a/0xc00 fs/ntfs3/fsntfs.c:1289
 indx_read+0x450/0x1840 fs/ntfs3/index.c:1067
 ntfs_readdir+0xddf/0x1a30 fs/ntfs3/dir.c:489
 iterate_dir+0x716/0x920 fs/readdir.c:108
 __do_sys_getdents64 fs/readdir.c:403 [inline]
 __se_sys_getdents64+0x17e/0x550 fs/readdir.c:389
 __x64_sys_getdents64+0x97/0xe0 fs/readdir.c:389
 x64_sys_call+0x16c4/0x3db0 arch/x86/include/generated/asm/syscalls_64.h:218
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd9/0x1b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was stored to memory at:
 ntfs_write_bh+0x6ae/0xe90 fs/ntfs3/fsntfs.c:1426
 indx_write fs/ntfs3/index.c:1027 [inline]
 indx_insert_into_buffer+0x287/0x2010 fs/ntfs3/index.c:1809
 indx_insert_entry+0xcde/0x1050 fs/ntfs3/index.c:1986
 ntfs_create_inode+0x47b0/0x5560 fs/ntfs3/inode.c:1616
 ntfs_mkdir+0x56/0x80 fs/ntfs3/namei.c:207
 vfs_mkdir+0x4e7/0x850 fs/namei.c:4359
 do_mkdirat+0x41a/0xf30 fs/namei.c:4392
 __do_sys_mkdir fs/namei.c:4414 [inline]
 __se_sys_mkdir fs/namei.c:4412 [inline]
 __x64_sys_mkdir+0x9a/0xf0 fs/namei.c:4412
 x64_sys_call+0x29b6/0x3db0 arch/x86/include/generated/asm/syscalls_64.h:84
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd9/0x1b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was stored to memory at:
 hdr_insert_de+0x471/0x550 fs/ntfs3/index.c:835
 indx_insert_into_buffer+0x1b6/0x2010 fs/ntfs3/index.c:1805
 indx_insert_entry+0xcde/0x1050 fs/ntfs3/index.c:1986
 ntfs_create_inode+0x47b0/0x5560 fs/ntfs3/inode.c:1616
 ntfs_mkdir+0x56/0x80 fs/ntfs3/namei.c:207
 vfs_mkdir+0x4e7/0x850 fs/namei.c:4359
 do_mkdirat+0x41a/0xf30 fs/namei.c:4392
 __do_sys_mkdir fs/namei.c:4414 [inline]
 __se_sys_mkdir fs/namei.c:4412 [inline]
 __x64_sys_mkdir+0x9a/0xf0 fs/namei.c:4412
 x64_sys_call+0x29b6/0x3db0 arch/x86/include/generated/asm/syscalls_64.h:84
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd9/0x1b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was stored to memory at:
 ntfs_read_run_nb+0x7cf/0x1810 fs/ntfs3/fsntfs.c:1228
 ntfs_read_bh+0x6a/0xc00 fs/ntfs3/fsntfs.c:1289
 indx_read+0x450/0x1840 fs/ntfs3/index.c:1067
 indx_find+0xa80/0x1510 fs/ntfs3/index.c:1179
 indx_insert_entry+0xd74/0x1050 fs/ntfs3/index.c:1963
 ntfs_create_inode+0x47b0/0x5560 fs/ntfs3/inode.c:1616
 ntfs_mkdir+0x56/0x80 fs/ntfs3/namei.c:207
 vfs_mkdir+0x4e7/0x850 fs/namei.c:4359
 do_mkdirat+0x41a/0xf30 fs/namei.c:4392
 __do_sys_mkdir fs/namei.c:4414 [inline]
 __se_sys_mkdir fs/namei.c:4412 [inline]
 __x64_sys_mkdir+0x9a/0xf0 fs/namei.c:4412
 x64_sys_call+0x29b6/0x3db0 arch/x86/include/generated/asm/syscalls_64.h:84
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd9/0x1b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was stored to memory at:
 ntfs_write_bh+0x6ae/0xe90 fs/ntfs3/fsntfs.c:1426
 indx_write fs/ntfs3/index.c:1027 [inline]
 indx_insert_into_buffer+0x287/0x2010 fs/ntfs3/index.c:1809
 indx_insert_entry+0xcde/0x1050 fs/ntfs3/index.c:1986
 ni_add_name+0xef7/0x11e0 fs/ntfs3/frecord.c:2995
 ntfs_link_inode+0x221/0x350 fs/ntfs3/inode.c:1698
 ntfs_link+0x20e/0x500 fs/ntfs3/namei.c:146
 vfs_link+0x8e8/0xb30 fs/namei.c:4847
 do_linkat+0x4af/0x1040 fs/namei.c:4917
 __do_sys_link fs/namei.c:4951 [inline]
 __se_sys_link fs/namei.c:4949 [inline]
 __x64_sys_link+0xd7/0x140 fs/namei.c:4949
 x64_sys_call+0x3567/0x3db0 arch/x86/include/generated/asm/syscalls_64.h:87
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd9/0x1b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was stored to memory at:
 hdr_insert_de+0x4c8/0x550 fs/ntfs3/index.c:838
 indx_insert_into_buffer+0x1b6/0x2010 fs/ntfs3/index.c:1805
 indx_insert_entry+0xcde/0x1050 fs/ntfs3/index.c:1986
 ni_add_name+0xef7/0x11e0 fs/ntfs3/frecord.c:2995
 ntfs_link_inode+0x221/0x350 fs/ntfs3/inode.c:1698
 ntfs_link+0x20e/0x500 fs/ntfs3/namei.c:146
 vfs_link+0x8e8/0xb30 fs/namei.c:4847
 do_linkat+0x4af/0x1040 fs/namei.c:4917
 __do_sys_link fs/namei.c:4951 [inline]
 __se_sys_link fs/namei.c:4949 [inline]
 __x64_sys_link+0xd7/0x140 fs/namei.c:4949
 x64_sys_call+0x3567/0x3db0 arch/x86/include/generated/asm/syscalls_64.h:87
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd9/0x1b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was created at:
 slab_post_alloc_hook mm/slub.c:4167 [inline]
 slab_alloc_node mm/slub.c:4210 [inline]
 kmem_cache_alloc_noprof+0x81b/0xec0 mm/slub.c:4217
 ntfs_link_inode+0x90/0x350 fs/ntfs3/inode.c:1686
 ntfs_link+0x20e/0x500 fs/ntfs3/namei.c:146
 vfs_link+0x8e8/0xb30 fs/namei.c:4847
 do_linkat+0x4af/0x1040 fs/namei.c:4917
 __do_sys_link fs/namei.c:4951 [inline]
 __se_sys_link fs/namei.c:4949 [inline]
 __x64_sys_link+0xd7/0x140 fs/namei.c:4949
 x64_sys_call+0x3567/0x3db0 arch/x86/include/generated/asm/syscalls_64.h:87
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd9/0x1b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

CPU: 0 UID: 0 PID: 5804 Comm: syz-executor Not tainted 6.15.0-rc3-syzkaller-00094-g02ddfb981de8 #0 PREEMPT(undef) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
=====================================================

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/04/28 10:39 upstream 02ddfb981de8 c6b4fb39 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in ntfs_read_hdr
* Struck through repros no longer work on HEAD.