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Mon, 16 Mar 2026 03:22:46 -0700 (PDT) Date: Mon, 16 Mar 2026 03:22:46 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69b7d9f6.050a0220.248e02.0112.GAE@google.com> Subject: [syzbot] [mm?] KMSAN: uninit-value in copy_from_kernel_nofault From: syzbot To: Liam.Howlett@oracle.com, akpm@linux-foundation.org, david@kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, ljs@kernel.org, mhocko@suse.com, rppt@kernel.org, surenb@google.com, syzkaller-bugs@googlegroups.com, vbabka@kernel.org Content-Type: text/plain; charset="UTF-8" X-Rspamd-Queue-Id: C59D440008 X-Rspamd-Server: rspam07 X-Stat-Signature: zxsdy1cbfx3atqhwpc498tqzds97emck X-Rspam-User: X-HE-Tag: 1773656567-518091 X-HE-Meta: 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 XGJsTCv+ 9nRps43s3q5VwKGb/3N+EXTU6dWgYNZGOWEl5gJom2CjpHmh0RIPhSQnB0pf0CzNdA9WyWL59P4ZDonJxJNo8NQuWi1RMbaPkDupTr+jQZB4sW4WWWHhqkZgJG6hLCnCkxZ1rJXzszP2qm3s+DxAtq/3mIhwm1QEIuiZK4dljsP+lDdbhEcIimfMwfeDkL/ZQn26MDB0myTkQH9lyl9Vtu3RNOv2FI1h/wFFdcGUgS2yKbKRAs74n39olQjbKemNm8zwNcQbwJJkwIUaWZKeHpWYG6Lkxb7e0+qUUy1AjlXwm9SmKw34Np2dVLN1UWHaydn3pyaij6hItF4ZSjMIDTjEBZ8RN/dagZRas8Zy82xFFSQ8KXyV+VtkISpqQAz1l33D3GYuaXTTw48mQuq8q8MO4x/kSxZ1ybBTeVteVK7kT2KOdMbZiaCWm9K6V0HvubDqcYFaVIXeAj8vGzyf3EuNrrsaKMlxHXFwhcKs8MfYtrXWLOUwjou+RqWj2rfXhJ7UARCdk57XDfXe8xvXDoBAdPcvd5jNJ7b/qobGFGBZ2EmvsWFFPGEagJG4GWkTWmQrXRvVvVFKFl4Ah4XU2mLWvCLCUpzQKZ7RLNSTXHE0+rbjabE+mfCMFGmlNu0rZHaMqRL85mStvgWJstg3US+R6FsC4KkYDeLSiS/CXeh514wQd7uOdXnKPx2nB5jhm5+uq2oCJ8L7+xs4SL7BXSwes83gJmPbb916mL37UB1vl0sQFVEcpBQnp8G971q9rF1+XJuMzZzt+VJ6IYvrL8fLNaX+JtQ/sjmFRX9l2f646dx+yb5Bhk4O1/j5Ivm4hs0LvEPL6272pIv4OS8MNbunMKUTJZXuPQ7wQ+hE+iHJKgF01cJA6VRtatuF9YZnqzhAppHHosj5cvbreRNVAbmzNL0xRyW5Q1DY1o0SKflmjNn8yp+okXk5YWfFTiuQzqYPTExFbsSKXmObQRHq7mZDKaBJq oWYIpdoO ZrPyhAfFEGJ+Uah+cmb7uCGzxWk3x5cbESkIsGqQKM3ogf08tc/b4b4MJulzI1ZeyDRQoReXh5X8SmhOg32aoCwc8+bgX2Uk7x+2nXHEacfS4F8iBUpB/ulAt+KriMWc8k/r9FFdpcJ8U01TZ2PLZaS4uL+Eht0bsSwHWqas7e3yKO0PKGRLg9jSFolH82kIZ6yZmz1EXJUIJJY/9HOg7LORYdL9eL7BsfuspoxTOgboMnFjleyuhww2wx6z9lha0m/TjG8nPDjhnk2pady5j2gcbfmgk5UEO+fGm0Cjfs6Yw6qXWWtN10cELcsatctk8Ynky05MJC+ImFKig0CVw4cJwrt5Iv33Dcbe2mlPMULgqa8Rl1ysZQw2Lmbisrc9kU/8ARyCdv+HAHU0IuJyvRbPASemTf9EUUMsADTjVClng3CevtnjtdUqB0E9Gm5Mh1TiOvY8mbec7/NUo8Xhj1wcqbvHIHq1 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Hello, syzbot found the following issue on: HEAD commit: 80234b5ab240 Merge tag 'rproc-v7.0-fixes' of git://git.ker.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1474cd52580000 kernel config: https://syzkaller.appspot.com/x/.config?x=242f02fcd3fbc8f3 dashboard link: https://syzkaller.appspot.com/bug?extid=c18de0ad13d62f18469d compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 userspace arch: i386 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/a0d037332dff/disk-80234b5a.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/0a1f7f8b54f8/vmlinux-80234b5a.xz kernel image: https://storage.googleapis.com/syzbot-assets/83eb68ee6421/bzImage-80234b5a.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+c18de0ad13d62f18469d@syzkaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in copy_from_kernel_nofault+0x15f/0x570 mm/maccess.c:41 copy_from_kernel_nofault+0x15f/0x570 mm/maccess.c:41 prepend_copy fs/d_path.c:50 [inline] prepend fs/d_path.c:76 [inline] prepend_name fs/d_path.c:101 [inline] __prepend_path fs/d_path.c:133 [inline] prepend_path+0x64e/0x1090 fs/d_path.c:172 d_absolute_path+0x11b/0x240 fs/d_path.c:234 tomoyo_get_absolute_path security/tomoyo/realpath.c:101 [inline] tomoyo_realpath_from_path+0x4bd/0x9f0 security/tomoyo/realpath.c:271 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_perm+0x249/0x9a0 security/tomoyo/file.c:827 tomoyo_inode_getattr+0x35/0x40 security/tomoyo/tomoyo.c:123 security_inode_getattr+0x16e/0x590 security/security.c:1869 vfs_getattr fs/stat.c:259 [inline] vfs_fstat fs/stat.c:281 [inline] __do_sys_newfstat fs/stat.c:551 [inline] __se_sys_newfstat+0xd5/0xa60 fs/stat.c:546 __x64_sys_newfstat+0x78/0xb0 fs/stat.c:546 x64_sys_call+0x2f28/0x3ea0 arch/x86/include/generated/asm/syscalls_64.h:6 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x134/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was stored to memory at: copy_name fs/dcache.c:2861 [inline] __d_move+0xf72/0x2aa0 fs/dcache.c:2930 d_move+0x71/0xf0 fs/dcache.c:2977 vfs_rename+0x2510/0x2650 fs/namei.c:6041 filename_renameat2+0xb7f/0x1260 fs/namei.c:6144 __do_sys_rename fs/namei.c:6188 [inline] __se_sys_rename+0xc5/0x5d0 fs/namei.c:6184 __x64_sys_rename+0x78/0xb0 fs/namei.c:6184 x64_sys_call+0x329/0x3ea0 arch/x86/include/generated/asm/syscalls_64.h:83 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x134/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was stored to memory at: copy_name fs/dcache.c:2861 [inline] __d_move+0xf72/0x2aa0 fs/dcache.c:2930 d_move+0x71/0xf0 fs/dcache.c:2977 vfs_rename+0x2510/0x2650 fs/namei.c:6041 filename_renameat2+0xb7f/0x1260 fs/namei.c:6144 __do_sys_rename fs/namei.c:6188 [inline] __se_sys_rename+0xc5/0x5d0 fs/namei.c:6184 __x64_sys_rename+0x78/0xb0 fs/namei.c:6184 x64_sys_call+0x329/0x3ea0 arch/x86/include/generated/asm/syscalls_64.h:83 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x134/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was stored to memory at: copy_name fs/dcache.c:2861 [inline] __d_move+0xf72/0x2aa0 fs/dcache.c:2930 d_move+0x71/0xf0 fs/dcache.c:2977 vfs_rename+0x2510/0x2650 fs/namei.c:6041 filename_renameat2+0xb7f/0x1260 fs/namei.c:6144 __do_sys_rename fs/namei.c:6188 [inline] __se_sys_rename+0xc5/0x5d0 fs/namei.c:6184 __x64_sys_rename+0x78/0xb0 fs/namei.c:6184 x64_sys_call+0x329/0x3ea0 arch/x86/include/generated/asm/syscalls_64.h:83 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x134/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was stored to memory at: copy_name fs/dcache.c:2861 [inline] __d_move+0xf72/0x2aa0 fs/dcache.c:2930 d_move+0x71/0xf0 fs/dcache.c:2977 vfs_rename+0x2510/0x2650 fs/namei.c:6041 filename_renameat2+0xb7f/0x1260 fs/namei.c:6144 __do_sys_rename fs/namei.c:6188 [inline] __se_sys_rename+0xc5/0x5d0 fs/namei.c:6184 __x64_sys_rename+0x78/0xb0 fs/namei.c:6184 x64_sys_call+0x329/0x3ea0 arch/x86/include/generated/asm/syscalls_64.h:83 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x134/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was stored to memory at: copy_name fs/dcache.c:2861 [inline] __d_move+0xf72/0x2aa0 fs/dcache.c:2930 d_move+0x71/0xf0 fs/dcache.c:2977 vfs_rename+0x2510/0x2650 fs/namei.c:6041 filename_renameat2+0xb7f/0x1260 fs/namei.c:6144 __do_sys_rename fs/namei.c:6188 [inline] __se_sys_rename+0xc5/0x5d0 fs/namei.c:6184 __x64_sys_rename+0x78/0xb0 fs/namei.c:6184 x64_sys_call+0x329/0x3ea0 arch/x86/include/generated/asm/syscalls_64.h:83 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x134/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was stored to memory at: copy_name fs/dcache.c:2861 [inline] __d_move+0xf72/0x2aa0 fs/dcache.c:2930 d_move+0x71/0xf0 fs/dcache.c:2977 vfs_rename+0x2510/0x2650 fs/namei.c:6041 filename_renameat2+0xb7f/0x1260 fs/namei.c:6144 __do_sys_rename fs/namei.c:6188 [inline] __se_sys_rename+0xc5/0x5d0 fs/namei.c:6184 __x64_sys_rename+0x78/0xb0 fs/namei.c:6184 x64_sys_call+0x329/0x3ea0 arch/x86/include/generated/asm/syscalls_64.h:83 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x134/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was stored to memory at: copy_name fs/dcache.c:2861 [inline] __d_move+0xf72/0x2aa0 fs/dcache.c:2930 d_move+0x71/0xf0 fs/dcache.c:2977 vfs_rename+0x2510/0x2650 fs/namei.c:6041 filename_renameat2+0xb7f/0x1260 fs/namei.c:6144 __do_sys_rename fs/namei.c:6188 [inline] __se_sys_rename+0xc5/0x5d0 fs/namei.c:6184 __x64_sys_rename+0x78/0xb0 fs/namei.c:6184 x64_sys_call+0x329/0x3ea0 arch/x86/include/generated/asm/syscalls_64.h:83 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x134/0xf80 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:4549 [inline] slab_alloc_node mm/slub.c:4869 [inline] kmem_cache_alloc_lru_noprof+0x382/0x1280 mm/slub.c:4888 __d_alloc+0x55/0xa00 fs/dcache.c:1740 d_alloc+0x57/0x300 fs/dcache.c:1819 lookup_one_qstr_excl+0x1a1/0x7b0 fs/namei.c:1801 __start_renaming+0x38e/0x870 fs/namei.c:3862 filename_renameat2+0x735/0x1260 fs/namei.c:6119 __do_sys_rename fs/namei.c:6188 [inline] __se_sys_rename+0xc5/0x5d0 fs/namei.c:6184 __x64_sys_rename+0x78/0xb0 fs/namei.c:6184 x64_sys_call+0x329/0x3ea0 arch/x86/include/generated/asm/syscalls_64.h:83 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x134/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Bytes 5-7 of 8 are uninitialized Memory access of size 8 starts at ffff888014109578 CPU: 0 UID: 0 PID: 5966 Comm: udevd Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/27/2026 ===================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup