From: syzbot <syzbot+853242d9c9917165d791@syzkaller.appspotmail.com>
To: andrii@kernel.org, ast@kernel.org, bpf@vger.kernel.org,
daniel@iogearbox.net, haoluo@google.com,
john.fastabend@gmail.com, jolsa@kernel.org, kpsingh@kernel.org,
linux-kernel@vger.kernel.org, martin.lau@linux.dev,
sdf@google.com, song@kernel.org,
syzkaller-bugs@googlegroups.com, yonghong.song@linux.dev
Subject: [syzbot] [bpf?] KMSAN: uninit-value in ___bpf_prog_run (4)
Date: Tue, 26 Dec 2023 07:59:19 -0800 [thread overview]
Message-ID: <000000000000dea025060d6bc3bc@google.com> (raw)
Hello,
syzbot found the following issue on:
HEAD commit: 55cb5f43689d Merge tag 'trace-v6.7-rc6' of git://git.kerne..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1275e59ee80000
kernel config: https://syzkaller.appspot.com/x/.config?x=4a65fa9f077ead01
dashboard link: https://syzkaller.appspot.com/bug?extid=853242d9c9917165d791
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/ab88d88fa1d1/disk-55cb5f43.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/587fd1186192/vmlinux-55cb5f43.xz
kernel image: https://storage.googleapis.com/syzbot-assets/c7bbb5741191/bzImage-55cb5f43.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+853242d9c9917165d791@syzkaller.appspotmail.com
=====================================================
BUG: KMSAN: uninit-value in ___bpf_prog_run+0x8a26/0xdb80 kernel/bpf/core.c:2037
___bpf_prog_run+0x8a26/0xdb80 kernel/bpf/core.c:2037
__bpf_prog_run512+0xb5/0xe0 kernel/bpf/core.c:2203
bpf_dispatcher_nop_func include/linux/bpf.h:1196 [inline]
__bpf_prog_run include/linux/filter.h:651 [inline]
bpf_prog_run include/linux/filter.h:658 [inline]
bpf_test_run+0x482/0xb00 net/bpf/test_run.c:423
bpf_prog_test_run_skb+0x14e5/0x1f20 net/bpf/test_run.c:1045
bpf_prog_test_run+0x6af/0xac0 kernel/bpf/syscall.c:4040
__sys_bpf+0x649/0xd60 kernel/bpf/syscall.c:5401
__do_sys_bpf kernel/bpf/syscall.c:5487 [inline]
__se_sys_bpf kernel/bpf/syscall.c:5485 [inline]
__x64_sys_bpf+0xa0/0xe0 kernel/bpf/syscall.c:5485
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x63/0x6b
Uninit was stored to memory at:
___bpf_prog_run+0x8567/0xdb80
__bpf_prog_run512+0xb5/0xe0 kernel/bpf/core.c:2203
bpf_dispatcher_nop_func include/linux/bpf.h:1196 [inline]
__bpf_prog_run include/linux/filter.h:651 [inline]
bpf_prog_run include/linux/filter.h:658 [inline]
bpf_test_run+0x482/0xb00 net/bpf/test_run.c:423
bpf_prog_test_run_skb+0x14e5/0x1f20 net/bpf/test_run.c:1045
bpf_prog_test_run+0x6af/0xac0 kernel/bpf/syscall.c:4040
__sys_bpf+0x649/0xd60 kernel/bpf/syscall.c:5401
__do_sys_bpf kernel/bpf/syscall.c:5487 [inline]
__se_sys_bpf kernel/bpf/syscall.c:5485 [inline]
__x64_sys_bpf+0xa0/0xe0 kernel/bpf/syscall.c:5485
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x63/0x6b
Local variable stack created at:
__bpf_prog_run512+0x45/0xe0 kernel/bpf/core.c:2203
bpf_dispatcher_nop_func include/linux/bpf.h:1196 [inline]
__bpf_prog_run include/linux/filter.h:651 [inline]
bpf_prog_run include/linux/filter.h:658 [inline]
bpf_test_run+0x482/0xb00 net/bpf/test_run.c:423
CPU: 1 PID: 13775 Comm: syz-executor.3 Not tainted 6.7.0-rc6-syzkaller-00022-g55cb5f43689d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
=====================================================
---
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
next reply other threads:[~2023-12-26 15:59 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-12-26 15:59 syzbot [this message]
2024-01-22 7:46 ` [syzbot] [bpf?] KMSAN: uninit-value in ___bpf_prog_run (4) syzbot
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=000000000000dea025060d6bc3bc@google.com \
--to=syzbot+853242d9c9917165d791@syzkaller.appspotmail.com \
--cc=andrii@kernel.org \
--cc=ast@kernel.org \
--cc=bpf@vger.kernel.org \
--cc=daniel@iogearbox.net \
--cc=haoluo@google.com \
--cc=john.fastabend@gmail.com \
--cc=jolsa@kernel.org \
--cc=kpsingh@kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=martin.lau@linux.dev \
--cc=sdf@google.com \
--cc=song@kernel.org \
--cc=syzkaller-bugs@googlegroups.com \
--cc=yonghong.song@linux.dev \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox