* [syzbot] KMSAN: kernel-infoleak in ucma_init_qp_attr
@ 2022-01-04 10:03 syzbot
2022-01-04 11:41 ` Leon Romanovsky
0 siblings, 1 reply; 2+ messages in thread
From: syzbot @ 2022-01-04 10:03 UTC (permalink / raw)
To: glider, jgg, leon, liangwenpeng, linux-kernel, linux-rdma,
liweihang, syzkaller-bugs, tanxiaofei, yuehaibing
Hello,
syzbot found the following issue on:
HEAD commit: 81c325bbf94e kmsan: hooks: do not check memory in kmsan_in..
git tree: https://github.com/google/kmsan.git master
console output: https://syzkaller.appspot.com/x/log.txt?x=10c4260db00000
kernel config: https://syzkaller.appspot.com/x/.config?x=2d8b9a11641dc9aa
dashboard link: https://syzkaller.appspot.com/bug?extid=6d532fa8f9463da290bc
compiler: clang version 14.0.0 (/usr/local/google/src/llvm-git-monorepo 2b554920f11c8b763cd9ed9003f4e19b919b8e1f), GNU ld (GNU Binutils for Debian) 2.35.2
userspace arch: i386
Unfortunately, I don't have any reproducer for this issue yet.
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+6d532fa8f9463da290bc@syzkaller.appspotmail.com
=====================================================
BUG: KMSAN: kernel-infoleak in instrument_copy_to_user include/linux/instrumented.h:121 [inline]
BUG: KMSAN: kernel-infoleak in _copy_to_user+0x1c9/0x270 lib/usercopy.c:33
instrument_copy_to_user include/linux/instrumented.h:121 [inline]
_copy_to_user+0x1c9/0x270 lib/usercopy.c:33
copy_to_user include/linux/uaccess.h:209 [inline]
ucma_init_qp_attr+0x8c7/0xb10 drivers/infiniband/core/ucma.c:1242
ucma_write+0x637/0x6c0 drivers/infiniband/core/ucma.c:1732
vfs_write+0x8ce/0x2030 fs/read_write.c:588
ksys_write+0x28b/0x510 fs/read_write.c:643
__do_sys_write fs/read_write.c:655 [inline]
__se_sys_write fs/read_write.c:652 [inline]
__ia32_sys_write+0xdb/0x120 fs/read_write.c:652
do_syscall_32_irqs_on arch/x86/entry/common.c:114 [inline]
__do_fast_syscall_32+0x96/0xf0 arch/x86/entry/common.c:180
do_fast_syscall_32+0x34/0x70 arch/x86/entry/common.c:205
do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:248
entry_SYSENTER_compat_after_hwframe+0x4d/0x5c
Local variable resp created at:
ucma_init_qp_attr+0xa4/0xb10 drivers/infiniband/core/ucma.c:1214
ucma_write+0x637/0x6c0 drivers/infiniband/core/ucma.c:1732
Bytes 40-59 of 144 are uninitialized
Memory access of size 144 starts at ffff888167523b00
Data copied to user address 0000000020000100
CPU: 1 PID: 25910 Comm: syz-executor.1 Not tainted 5.16.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
=====================================================
---
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.
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [syzbot] KMSAN: kernel-infoleak in ucma_init_qp_attr
2022-01-04 10:03 [syzbot] KMSAN: kernel-infoleak in ucma_init_qp_attr syzbot
@ 2022-01-04 11:41 ` Leon Romanovsky
0 siblings, 0 replies; 2+ messages in thread
From: Leon Romanovsky @ 2022-01-04 11:41 UTC (permalink / raw)
To: syzbot
Cc: glider, jgg, liangwenpeng, linux-kernel, linux-rdma, liweihang,
syzkaller-bugs, tanxiaofei, yuehaibing
On Tue, Jan 04, 2022 at 02:03:17AM -0800, syzbot wrote:
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: 81c325bbf94e kmsan: hooks: do not check memory in kmsan_in..
> git tree: https://github.com/google/kmsan.git master
> console output: https://syzkaller.appspot.com/x/log.txt?x=10c4260db00000
> kernel config: https://syzkaller.appspot.com/x/.config?x=2d8b9a11641dc9aa
> dashboard link: https://syzkaller.appspot.com/bug?extid=6d532fa8f9463da290bc
> compiler: clang version 14.0.0 (/usr/local/google/src/llvm-git-monorepo 2b554920f11c8b763cd9ed9003f4e19b919b8e1f), GNU ld (GNU Binutils for Debian) 2.35.2
> userspace arch: i386
>
> Unfortunately, I don't have any reproducer for this issue yet.
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+6d532fa8f9463da290bc@syzkaller.appspotmail.com
>
> =====================================================
> BUG: KMSAN: kernel-infoleak in instrument_copy_to_user include/linux/instrumented.h:121 [inline]
> BUG: KMSAN: kernel-infoleak in _copy_to_user+0x1c9/0x270 lib/usercopy.c:33
> instrument_copy_to_user include/linux/instrumented.h:121 [inline]
> _copy_to_user+0x1c9/0x270 lib/usercopy.c:33
> copy_to_user include/linux/uaccess.h:209 [inline]
> ucma_init_qp_attr+0x8c7/0xb10 drivers/infiniband/core/ucma.c:1242
> ucma_write+0x637/0x6c0 drivers/infiniband/core/ucma.c:1732
> vfs_write+0x8ce/0x2030 fs/read_write.c:588
> ksys_write+0x28b/0x510 fs/read_write.c:643
> __do_sys_write fs/read_write.c:655 [inline]
> __se_sys_write fs/read_write.c:652 [inline]
> __ia32_sys_write+0xdb/0x120 fs/read_write.c:652
> do_syscall_32_irqs_on arch/x86/entry/common.c:114 [inline]
> __do_fast_syscall_32+0x96/0xf0 arch/x86/entry/common.c:180
> do_fast_syscall_32+0x34/0x70 arch/x86/entry/common.c:205
> do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:248
> entry_SYSENTER_compat_after_hwframe+0x4d/0x5c
>
> Local variable resp created at:
> ucma_init_qp_attr+0xa4/0xb10 drivers/infiniband/core/ucma.c:1214
> ucma_write+0x637/0x6c0 drivers/infiniband/core/ucma.c:1732
>
> Bytes 40-59 of 144 are uninitialized
> Memory access of size 144 starts at ffff888167523b00
> Data copied to user address 0000000020000100
>
> CPU: 1 PID: 25910 Comm: syz-executor.1 Not tainted 5.16.0-rc5-syzkaller #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
> =====================================================
We are not clearing GRH fields in ib_copy_ah_attr_to_user() if dst->is_global is not set.
I'm testing the fix now and will post the patch after it will pass CI.
Thanks
>
>
> ---
> 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.
^ permalink raw reply [flat|nested] 2+ messages in thread
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2022-01-04 11:41 ` Leon Romanovsky
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