Accessing process stack pointer from kernel space

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Accessing process stack pointer from kernel space



I was able to get task_struct from current macro and am wondering if there is a way to get the process stack pointer from my custom sys_call to return to userspace(as readonly value)??





You have to tell what your custom sys_call does?
– LethalProgrammer
6 hours ago




1 Answer
1



It's easy to get it's value in assembly, so try using this:


#include <stdint.h>

uint64_t getsp(void)
{
uint64_t sp;
asm("mov %%rsp, %0" : "=rm" (sp));
return sp;
}






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