linux-kernel - [syzbot] [usb?] KMSAN: kernel-usb-infoleak in usbtmc_generic

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Message-ID: <0000000000006f6622061eb52dba@google.com>
Date: Fri, 02 Aug 2024 08:42:40 -0700
From: syzbot <syzbot+8f282cce71948071c335@...kaller.appspotmail.com>
To: gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org, 
	linux-usb@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: [syzbot] [usb?] KMSAN: kernel-usb-infoleak in usbtmc_generic_write

Hello,

syzbot found the following issue on:

HEAD commit:    94ede2a3e913 profiling: remove stale percpu flip buffer va..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12166111980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=2a7cf62669c9536b
dashboard link: https://syzkaller.appspot.com/bug?extid=8f282cce71948071c335
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/b4adcb60c426/disk-94ede2a3.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/50bde94d1be7/vmlinux-94ede2a3.xz
kernel image: https://storage.googleapis.com/syzbot-assets/0756c72c7478/bzImage-94ede2a3.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+8f282cce71948071c335@...kaller.appspotmail.com

=====================================================
BUG: KMSAN: kernel-usb-infoleak in usb_submit_urb+0x597/0x2350 drivers/usb/core/urb.c:430
 usb_submit_urb+0x597/0x2350 drivers/usb/core/urb.c:430
 usbtmc_generic_write+0x7b6/0xe80 drivers/usb/class/usbtmc.c:1213
 usbtmc_write+0xdbd/0x1220 drivers/usb/class/usbtmc.c:1622
 vfs_write+0x493/0x1550 fs/read_write.c:588
 ksys_write+0x20f/0x4c0 fs/read_write.c:643
 __do_sys_write fs/read_write.c:655 [inline]
 __se_sys_write fs/read_write.c:652 [inline]
 __x64_sys_write+0x93/0xe0 fs/read_write.c:652
 x64_sys_call+0x3490/0x3c10 arch/x86/include/generated/asm/syscalls_64.h:2
 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:3994 [inline]
 slab_alloc_node mm/slub.c:4037 [inline]
 __kmalloc_cache_noprof+0x4f0/0xb00 mm/slub.c:4184
 kmalloc_noprof include/linux/slab.h:681 [inline]
 usbtmc_create_urb drivers/usb/class/usbtmc.c:757 [inline]
 usbtmc_generic_write+0x430/0xe80 drivers/usb/class/usbtmc.c:1176
 usbtmc_write+0xdbd/0x1220 drivers/usb/class/usbtmc.c:1622
 vfs_write+0x493/0x1550 fs/read_write.c:588
 ksys_write+0x20f/0x4c0 fs/read_write.c:643
 __do_sys_write fs/read_write.c:655 [inline]
 __se_sys_write fs/read_write.c:652 [inline]
 __x64_sys_write+0x93/0xe0 fs/read_write.c:652
 x64_sys_call+0x3490/0x3c10 arch/x86/include/generated/asm/syscalls_64.h:2
 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

Bytes 1-3 of 4 are uninitialized
Memory access of size 4 starts at ffff88805376e000

CPU: 1 UID: 0 PID: 5623 Comm: syz.0.70 Not tainted 6.11.0-rc1-syzkaller-00043-g94ede2a3e913 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
=====================================================


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
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