first commit

.gitignore

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+runner

Makefile

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+all: 
+	gcc src/main.c src/cjson/cJSON.c -lm -o runner

calls.py

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+#!/usr/bin/env python
+import re
+
+with open('/usr/include/asm/unistd_64.h') as f:
+    defs = re.findall(r'#define __NR_(\w+)\s+(\d+)', f.read())
+
+for name, num in defs:
+    print(name, num)

src/access.c

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+#include <sys/user.h>
+#include <sys/syscall.h>
+#include <sys/ptrace.h>
+#include <fcntl.h>
+#include <string.h>
+
+int checkAccess(int pid, struct user_regs_struct *regs) {
+    if (!calls[REG_SYS_CALL(regs)])
+    {
+        printf("Illegal syscall: %d\n", REG_SYS_CALL(regs));
+        return ACCESS_CALL_ERR;
+    }
+    if (REG_SYS_CALL(regs) == SYS_open)
+    {
+        printf("Try to open file!\n");
+        return ACCESS_FILE_ERR;
+    }
+    return ACCESS_OK;
+}