From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mout02.posteo.de (mout02.posteo.de [185.67.36.66]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 110F5F9E6 for ; Mon, 3 Feb 2025 01:37:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.67.36.66 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1738546649; cv=none; b=bjxPR9na+cWvxugFAPhUf+rYFP4RIUUPOIv/ZyZJWap8cKCOw7YC+YDtCHLshK+AEN3GCpM321HWQuNZ3G1y2qIwhMoPAvdEPHfYfFlE7rc+Y2hvkEXonZDqhkm0rfuqCKvGq/ry2EBT3YnQVxEvKlEK9rqVzJpZh04aEfFk81o= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1738546649; c=relaxed/simple; bh=lKFqnOLMiCtpNmYJkU7K/TBuaKv1pbeWhDU29+Qd/2M=; h=Message-ID:Date:MIME-Version:Subject:To:References:From: In-Reply-To:Content-Type; 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t=1738546639; bh=lKFqnOLMiCtpNmYJkU7K/TBuaKv1pbeWhDU29+Qd/2M=; h=Message-ID:Date:MIME-Version:Subject:To:From:Content-Type: Content-Transfer-Encoding:From; b=pjSeePmwfBx2X6iyvMmutIcJgET6k+tWssMsg+yIKQLvj1zAboUa1AD0CDNA0k9Yz VwolRNY8WMXm99+TBSC28S5Ie9Zj2kSKVq66CyWkJtfWL+gWgWmTqNeFqUPpMiGs1r EhO/2Gxv19jzDapJAQJ8JWCJ4IEtoGwnZ/4XUrQLLcKSocoQyoGZ2Zp7+82eQy/QD/ urmmkvSaL1Fyb9iYb3/Wda4q7OB5n6d66LvSbBiGlEUhXQncKqv4FjTr7MUdFLrcdE x92ZkTgdVXV2Hfp2LXz3xfngoxK1ZJfocYt49oSbTArlnPXe0nbBzs9zkBLgUU/oU9 ARRaV/p6qx6Kw== Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 4YmTd94HqTz9rxB; Mon, 3 Feb 2025 02:37:17 +0100 (CET) Message-ID: Date: Mon, 3 Feb 2025 01:37:16 +0000 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Subject: Re: [syzbot] [fs?] KMSAN: uninit-value in full_proxy_poll To: syzbot , dakr@kernel.org, gregkh@linuxfoundation.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, rafael@kernel.org, syzkaller-bugs@googlegroups.com References: <67a01871.050a0220.d7c5a.007b.GAE@google.com> Content-Language: en-US From: Charalampos Mitrodimas In-Reply-To: <67a01871.050a0220.d7c5a.007b.GAE@google.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit 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|