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Message-ID: <000000000000d03df706215aa23c@google.com>
Date: Thu, 05 Sep 2024 00:57:02 -0700
From: syzbot <syzbot+9d34f80f841e948c3fdb@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org, lizhi.xu@...driver.com,
syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [usb?] KMSAN: kernel-usb-infoleak in usbtmc_write
Hello,
syzbot has tested the proposed patch but the reproducer is still triggering an issue:
KMSAN: kernel-usb-infoleak in usbtmc_write
=====================================================
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_write+0xc4f/0x1240 drivers/usb/class/usbtmc.c:1607
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+0x306a/0x3ba0 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:3998 [inline]
slab_alloc_node mm/slub.c:4041 [inline]
__kmalloc_cache_noprof+0x4f0/0xb00 mm/slub.c:4188
kmalloc_noprof include/linux/slab.h:681 [inline]
usbtmc_create_urb drivers/usb/class/usbtmc.c:757 [inline]
usbtmc_write+0x3d3/0x1240 drivers/usb/class/usbtmc.c:1547
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+0x306a/0x3ba0 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
Byte 15 of 16 is uninitialized
Memory access of size 16 starts at ffff88810a6a0000
CPU: 0 UID: 0 PID: 6214 Comm: syz.3.81 Not tainted 6.11.0-rc6-syzkaller-00070-gc763c4339688-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
=====================================================
Tested on:
commit: c763c433 Merge tag 'bcachefs-2024-09-04' of git://evil..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13324667980000
kernel config: https://syzkaller.appspot.com/x/.config?x=35c699864e165c51
dashboard link: https://syzkaller.appspot.com/bug?extid=9d34f80f841e948c3fdb
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
patch: https://syzkaller.appspot.com/x/patch.diff?x=15a7fd29980000
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