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#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <sys/mman.h>
#include <unistd.h>
extern uint8_t __start_target_section[];
extern uint8_t __stop_target_section[];
__attribute__((used, section("target_section"))) int target_function(void) {
return 42;
}
typedef int (*target_function_t)(void);
int main(void) {
size_t target_function_size = __stop_target_section - __start_target_section;
size_t page_size = sysconf(_SC_PAGESIZE);
size_t page_aligned_size =
(target_function_size + page_size - 1) & ~(page_size - 1);
void *executable_memory =
mmap(NULL, page_aligned_size, PROT_READ | PROT_WRITE | PROT_EXEC,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
if (executable_memory == MAP_FAILED) {
perror("mmap");
return 1;
}
memcpy(executable_memory, __start_target_section, target_function_size);
target_function_t func = (target_function_t)executable_memory;
int result = func(); // Break here
printf("Result from target function: %d\n", result);
return 0;
}
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