From: syzbot <syzbot+a84ce0b8e1f3da037bf7@syzkaller.appspotmail.com>
To: dakr@kernel.org, gregkh@linuxfoundation.org,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
rafael@kernel.org, syzkaller-bugs@googlegroups.com
Subject: [syzbot] [fs?] KMSAN: uninit-value in full_proxy_poll
Date: Sun, 02 Feb 2025 17:14:25 -0800 [thread overview]
Message-ID: <67a01871.050a0220.d7c5a.007b.GAE@google.com> (raw)
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
=====================================================
---
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next reply other threads:[~2025-02-03 1:14 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-02-03 1:14 syzbot [this message]
2025-02-03 1:37 ` [syzbot] [fs?] KMSAN: uninit-value in full_proxy_poll Charalampos Mitrodimas
2025-02-03 1:40 ` [syzbot] " syzbot
[not found] <3f1d7abd-3884-4a75-9531-efba7aa0b45b@posteo.net>
2025-02-03 2:28 ` syzbot
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