selinux_native/jni/utils/kallsyms.c
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "kallsyms.h"
#include "deobfuscate.h"
static unsigned char proc_kallsyms[] = "\xa2\x97\x3b\xb3\xfe\xf0\xf3\xcf\xb3\xf7\xcd\xf2\xf2\xff\xe5\xf1\xff"; // "/proc/kallsyms"
static unsigned char stext[] = "\xe4\x39\xdb\xcd\xe9\xf0\x83\xec\xf0"; // "_stext"
bool
kallsyms_exist(void)
{
struct stat st;
if (stat(deobfuscate(proc_kallsyms), &st) < 0) {
return false;
}
if (st.st_mode & S_IROTH) {
return kallsyms_get_symbol_address(deobfuscate(stext)) != 0;
}
return false;
}
void *
kallsyms_get_symbol_address(const char *symbol_name)
{
FILE *fp;
char function[BUFSIZ];
char symbol;
void *address;
int ret;
fp = fopen(deobfuscate(proc_kallsyms), "r");
if (!fp) {
return 0;
}
while(!feof(fp)) {
ret = fscanf(fp, "%p %c %s", &address, &symbol, function);
if (ret != 3) {
break;
}
if (!strcmp(function, symbol_name)) {
fclose(fp);
return address;
}
}
fclose(fp);
return NULL;
}