hardened_malloc/memory.c

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#include <errno.h>
#include <sys/mman.h>
#include "memory.h"
#include "util.h"
void *memory_map(size_t size) {
void *p = mmap(NULL, size, PROT_NONE, MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
if (unlikely(p == MAP_FAILED)) {
if (errno != ENOMEM) {
fatal_error("non-ENOMEM mmap failure");
}
return NULL;
}
return p;
}
int memory_unmap(void *ptr, size_t size) {
int ret = munmap(ptr, size);
if (unlikely(ret) && errno != ENOMEM) {
fatal_error("non-ENOMEM munmap failure");
}
return ret;
}
int memory_protect(void *ptr, size_t size, int prot) {
int ret = mprotect(ptr, size, prot);
if (unlikely(ret) && errno != ENOMEM) {
fatal_error("non-ENOMEM mprotect failure");
}
return ret;
}