Re: [PATCH v12 8/8] x86: Disallow vsyscall emulation when CET is enabled
From: Yu, Yu-cheng <hidden>
Date: 2020-09-23 22:20:32
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On 9/23/2020 3:08 PM, Dave Hansen wrote:
On 9/23/20 3:06 PM, Yu, Yu-cheng wrote:quoted
I think I'll add a check here for (r + 8) >= TASK_SIZE_MAX. It is better than getting a fault.There's also wrmsr_safe().
Yes, thanks.
Since I am going to change this to:
fpu__prepare_write(), then write to the XSAVES area.
The kernel does not expect XRSTORS to fail ("Bad FPU state detected..."
message). So maybe still check the address first.