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Aug 14, 2025
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Add missing period #335

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2 changes: 1 addition & 1 deletion lkmpg.tex
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Expand Up @@ -1475,7 +1475,7 @@ \section{System Calls}
A control register is a processor register that changes or controls the general behavior of the CPU.
For x86 architecture, the \verb|cr0| register has various control flags that modify the basic operation of the processor.
The \verb|WP| flag in \verb|cr0| stands for write protection.
Once the \verb|WP| flag is set, the processor disallows further write attempts to the read-only sections
Once the \verb|WP| flag is set, the processor disallows further write attempts to the read-only sections.
Therefore, we must disable the \verb|WP| flag before modifying \cpp|sys_call_table|.
Since Linux v5.3, the \cpp|write_cr0| function cannot be used because of the sensitive \verb|cr0| bits pinned by the security issue, the attacker may write into CPU control registers to disable CPU protections like write protection.
As a result, we have to provide the custom assembly routine to bypass it.
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