From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f207.google.com (mail-il1-f207.google.com [209.85.166.207]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id ECBE74414 for ; Mon, 3 Feb 2025 01:40:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.207 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1738546858; cv=none; b=pEaVEFDWcanIbCWGn/z0x7DrYeYbnxY1PtOj98rll2DyG0gAOqSrTgx7h/r8ATs6nTbObjDYJMu+nUKrwvCyWBxZ6zzg3GrMCT+tkpKL8muzpQFS9VwbPnR5Rd/fxy+D4nGCUtQaMzL0qtvOqhvUYQfUiVLbD46BMdBe9pI2u2E= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1738546858; c=relaxed/simple; bh=aJBFzAODxzcciGo776/0jsszI9MAswddRduaqx+oiIE=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; b=NkbGVDWSURdjr6F5gox/Bs32dxQ3EnIhET+UjzdfsKxWrg7C1h1ElmvrzW5B4F1+8Abzy41aTgJiOgo4uRasT0chLmqrptfK59dFxbiBsjBhQVryujry/4CAPbdno/Kcfgz9T+Ca4MIyHUWpoTCpPi1AsuHAjdNzLTKaoyhyxuM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.166.207 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-il1-f207.google.com with SMTP id e9e14a558f8ab-3cde3591dbfso23892865ab.0 for ; Sun, 02 Feb 2025 17:40:56 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1738546856; x=1739151656; h=to:from:subject:message-id:in-reply-to:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=lYv5TEQyj8f/kzxVZqoOCkeZ8BGv/gcv0nR/mKYS8k0=; b=davmp55WWW7rwixYDY67ezLzL3Cj67GEw8wGlXb71UKgQamfqATvSJC2bP6rr/Qqfb PzdeiY+bEELEhcQZ+3uTnJT4gf53lKWYRVW4kQQQI7XtoL617hZ0+mWJUIzpF46F0Ilb EIHy58Cke4G8IPhCples/TFxSQPaMjVJ2bLlrc0TE/cdVBljjIXp9bOrFOWpcuBSNX3S Olq+h9BBcu9YU2R1624bJZnYmklRNc9UOBw5KyB7UPBr4KuuIcSwrJly8ZJWR+dxVwm/ fxgI03LKb9m0x5lBdmQJ9Vv6D432IvCt9KT9lthsTXJ1g05l3WEVfxHk2tEKEpKn+5LK J+GQ== X-Gm-Message-State: AOJu0YwWTtKKdgke5L+0jujC87uiUA/d3tQRPIrCGeOg4xoLOZTljBE9 wRtsTZK6UrzKckb0BhkdLQ9/vcSrudjgjxRKRhQjC26gfBg/i7kXILtLiUBDQ7Q3YPeoD+bQRdE 74aF0QHv/A7mpeMarZUkJeFZFhFadFq1trdQjDh1aLqtQafvDNKhMNch3qw== X-Google-Smtp-Source: AGHT+IEEMSE6NUXdcYi7yzgciLOasY5FfCLdCRWueukPKt+9Vk/ofjpmrZLA3FTeMoUv+Fp45hYcTml0D8XQyWe39FEC42Vaapul Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:152d:b0:3cf:fd62:e39c with SMTP id e9e14a558f8ab-3d008eea445mr124152175ab.5.1738546856064; Sun, 02 Feb 2025 17:40:56 -0800 (PST) Date: Sun, 02 Feb 2025 17:40:56 -0800 In-Reply-To: <67a01871.050a0220.d7c5a.007b.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <67a01ea8.050a0220.d7c5a.007c.GAE@google.com> Subject: Re: [syzbot] Re: [syzbot] [fs?] KMSAN: uninit-value in full_proxy_poll From: syzbot To: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" For archival purposes, forwarding an incoming command email to linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com. *** Subject: Re: [syzbot] [fs?] KMSAN: uninit-value in full_proxy_poll Author: charmitro@posteo.net On 3/2/25 3:14 AM, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: b4b0881156fb Merge tag 'docs-6.14-2' of git://git.lwn.net/.. > git tree: upstream > console+strace: https://syzkaller.appspot.com/x/log.txt?x=146c5ddf980000 > kernel config: https://syzkaller.appspot.com/x/.config?x=7d0bb5e08cf54aa2 > dashboard link: https://syzkaller.appspot.com/bug?extid=a84ce0b8e1f3da037bf7 > compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10cb8518580000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=122a0b24580000 > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/4dbe3cd3dcb8/disk-b4b08811.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/592d90859f86/vmlinux-b4b08811.xz > kernel image: https://storage.googleapis.com/syzbot-assets/4cfde2b63c7f/bzImage-b4b08811.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+a84ce0b8e1f3da037bf7@syzkaller.appspotmail.com > > ===================================================== > BUG: KMSAN: uninit-value in full_proxy_poll+0xdf/0x3b0 fs/debugfs/file.c:411 > full_proxy_poll+0xdf/0x3b0 fs/debugfs/file.c:411 > vfs_poll include/linux/poll.h:82 [inline] > ep_item_poll fs/eventpoll.c:1060 [inline] > ep_insert+0x19c7/0x2740 fs/eventpoll.c:1736 > do_epoll_ctl+0xd83/0x17f0 fs/eventpoll.c:2394 > __do_sys_epoll_ctl fs/eventpoll.c:2445 [inline] > __se_sys_epoll_ctl fs/eventpoll.c:2436 [inline] > __x64_sys_epoll_ctl+0x1b5/0x210 fs/eventpoll.c:2436 > x64_sys_call+0x1658/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:234 > do_syscall_x64 arch/x86/entry/common.c:52 [inline] > do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > > Uninit was stored to memory at: > __debugfs_file_get+0xe86/0xef0 fs/debugfs/file.c:122 > full_proxy_open_regular+0x67/0xa00 fs/debugfs/file.c:447 > do_dentry_open+0x1bdd/0x26b0 fs/open.c:955 > vfs_open+0x53/0x5b0 fs/open.c:1085 > do_open fs/namei.c:3830 [inline] > path_openat+0x56a1/0x6250 fs/namei.c:3989 > do_filp_open+0x268/0x600 fs/namei.c:4016 > do_sys_openat2+0x1bf/0x2f0 fs/open.c:1427 > do_sys_open fs/open.c:1442 [inline] > __do_sys_openat fs/open.c:1458 [inline] > __se_sys_openat fs/open.c:1453 [inline] > __x64_sys_openat+0x2a1/0x310 fs/open.c:1453 > x64_sys_call+0x36f5/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:258 > do_syscall_x64 arch/x86/entry/common.c:52 [inline] > do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > > Uninit was stored to memory at: > __debugfs_file_get+0xe59/0xef0 fs/debugfs/file.c:120 > full_proxy_open_regular+0x67/0xa00 fs/debugfs/file.c:447 > do_dentry_open+0x1bdd/0x26b0 fs/open.c:955 > vfs_open+0x53/0x5b0 fs/open.c:1085 > do_open fs/namei.c:3830 [inline] > path_openat+0x56a1/0x6250 fs/namei.c:3989 > do_filp_open+0x268/0x600 fs/namei.c:4016 > do_sys_openat2+0x1bf/0x2f0 fs/open.c:1427 > do_sys_open fs/open.c:1442 [inline] > __do_sys_openat fs/open.c:1458 [inline] > __se_sys_openat fs/open.c:1453 [inline] > __x64_sys_openat+0x2a1/0x310 fs/open.c:1453 > x64_sys_call+0x36f5/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:258 > do_syscall_x64 arch/x86/entry/common.c:52 [inline] > do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > > Uninit was stored to memory at: > __debugfs_file_get+0xdff/0xef0 fs/debugfs/file.c:118 > full_proxy_open_regular+0x67/0xa00 fs/debugfs/file.c:447 > do_dentry_open+0x1bdd/0x26b0 fs/open.c:955 > vfs_open+0x53/0x5b0 fs/open.c:1085 > do_open fs/namei.c:3830 [inline] > path_openat+0x56a1/0x6250 fs/namei.c:3989 > do_filp_open+0x268/0x600 fs/namei.c:4016 > do_sys_openat2+0x1bf/0x2f0 fs/open.c:1427 > do_sys_open fs/open.c:1442 [inline] > __do_sys_openat fs/open.c:1458 [inline] > __se_sys_openat fs/open.c:1453 [inline] > __x64_sys_openat+0x2a1/0x310 fs/open.c:1453 > x64_sys_call+0x36f5/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:258 > do_syscall_x64 arch/x86/entry/common.c:52 [inline] > do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > > Uninit was created at: > slab_post_alloc_hook mm/slub.c:4121 [inline] > slab_alloc_node mm/slub.c:4164 [inline] > __kmalloc_cache_noprof+0x8e3/0xdf0 mm/slub.c:4320 > kmalloc_noprof include/linux/slab.h:901 [inline] > __debugfs_file_get+0x31d/0xef0 fs/debugfs/file.c:101 > full_proxy_open_regular+0x67/0xa00 fs/debugfs/file.c:447 > do_dentry_open+0x1bdd/0x26b0 fs/open.c:955 > vfs_open+0x53/0x5b0 fs/open.c:1085 > do_open fs/namei.c:3830 [inline] > path_openat+0x56a1/0x6250 fs/namei.c:3989 > do_filp_open+0x268/0x600 fs/namei.c:4016 > do_sys_openat2+0x1bf/0x2f0 fs/open.c:1427 > do_sys_open fs/open.c:1442 [inline] > __do_sys_openat fs/open.c:1458 [inline] > __se_sys_openat fs/open.c:1453 [inline] > __x64_sys_openat+0x2a1/0x310 fs/open.c:1453 > x64_sys_call+0x36f5/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:258 > do_syscall_x64 arch/x86/entry/common.c:52 [inline] > do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > > CPU: 0 UID: 0 PID: 5778 Comm: syz-executor303 Not tainted 6.13.0-syzkaller-09585-gb4b0881156fb #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 > ===================================================== > > > --- > 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 #syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 57b314752ec0ad42685bc78b376326f1f4c04669