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AJvYcCWxmy7Dgus+ZZsq84oKPHynnQyFX9yHcZWdTvJTmzMNwad9NvNCPCKx/0R2kvE6wxtXIbJjdS7r66C71SKk@vger.kernel.org X-Gm-Message-State: AOJu0YwFuT3V0oWabnb+udeLxf2eL8CzXr9DBc2ltIrLuBu6CyFdPooI PHOJU2QVLGcjbb5r88w6z/vAXSHLbBymf7S4q0WJzfL7FEX96YSjEmhimbFN8sR4GWq8VseArnd 5W/+B0X8tiiU5McDUdNfJrmIW0cYARySwIKvZ2Kwx4FuaEihxlZ4TAIqouQs= Precedence: bulk X-Mailing-List: linux-unionfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:3088:b0:662:f61e:759d with SMTP id 006d021491bc7-66d0c666b89mr6513087eaf.62.1770707127429; Mon, 09 Feb 2026 23:05:27 -0800 (PST) Date: Mon, 09 Feb 2026 23:05:27 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <698ad8b7.050a0220.3b3015.008b.GAE@google.com> Subject: [syzbot] [overlayfs?] KMSAN: uninit-value in ovl_fileattr_get From: syzbot To: amir73il@gmail.com, linux-kernel@vger.kernel.org, linux-unionfs@vger.kernel.org, miklos@szeredi.hu, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 8fdb05de0e2d Merge tag 'net-6.19-rc9' of git://git.kernel... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=13d888aa580000 kernel config: https://syzkaller.appspot.com/x/.config?x=9682a42d8ec8b05c dashboard link: https://syzkaller.appspot.com/bug?extid=fa79520cb6cf363d660d compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1233cb22580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1035878a580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/25d060d68c51/disk-8fdb05de.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/f033f4d0ec73/vmlinux-8fdb05de.xz kernel image: https://storage.googleapis.com/syzbot-assets/942ea5e5d5f5/bzImage-8fdb05de.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+fa79520cb6cf363d660d@syzkaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in ovl_security_fileattr fs/overlayfs/inode.c:617 [inline] BUG: KMSAN: uninit-value in ovl_real_fileattr_get fs/overlayfs/inode.c:701 [inline] BUG: KMSAN: uninit-value in ovl_fileattr_get+0x5cd/0x650 fs/overlayfs/inode.c:720 ovl_security_fileattr fs/overlayfs/inode.c:617 [inline] ovl_real_fileattr_get fs/overlayfs/inode.c:701 [inline] ovl_fileattr_get+0x5cd/0x650 fs/overlayfs/inode.c:720 vfs_fileattr_get fs/file_attr.c:94 [inline] __do_sys_file_getattr fs/file_attr.c:416 [inline] __se_sys_file_getattr+0x6cb/0xbd0 fs/file_attr.c:372 __x64_sys_file_getattr+0xe4/0x150 fs/file_attr.c:372 x64_sys_call+0x17cd/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:469 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xc9/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Uninit was stored to memory at: ovl_security_fileattr fs/overlayfs/inode.c:612 [inline] ovl_real_fileattr_get fs/overlayfs/inode.c:701 [inline] ovl_fileattr_get+0x5c6/0x650 fs/overlayfs/inode.c:720 vfs_fileattr_get fs/file_attr.c:94 [inline] __do_sys_file_getattr fs/file_attr.c:416 [inline] __se_sys_file_getattr+0x6cb/0xbd0 fs/file_attr.c:372 __x64_sys_file_getattr+0xe4/0x150 fs/file_attr.c:372 x64_sys_call+0x17cd/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:469 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xc9/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Local variable fa.i created at: __do_sys_file_getattr fs/file_attr.c:380 [inline] __se_sys_file_getattr+0x8c/0xbd0 fs/file_attr.c:372 __x64_sys_file_getattr+0xe4/0x150 fs/file_attr.c:372 CPU: 0 UID: 0 PID: 6044 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 ===================================================== --- 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 syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. 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