CODEWITHSUNDEEP
linuxlinux-kernellinux-device-drivermprotect
hsnm
hsnm

Reputation: 668

Is it possible to call sys_mprotect from a kernel module

I'm writing a kernel module that needs to change page permissions for a task. Normally, the task would just call mprotect and set the permissions. As I understand Linux kernel has sys_mprotect, which performs the actual system call.

Is it possible that my Linux kernel module calls sys_mprotect? I cannot seem to find a kernel API that allows that.

Upvotes: 0

Views: 859

Answers (1)

hsnm
hsnm

Reputation: 668

I figured out it's possible to call sys_mprotect in a kernel module as explained here using kallsyms_lookup_name.

An alternative way for achieving some of the page permission changes is to directly call kernel APIs such as pte_wrprotect, which will clear the write permissions from a PTE.

Upvotes: 0

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