memtest.md

// This source code was generated by anyexec2c. // Link: https://github.com/exyi/anyexec2C

// ============================== // tools/memtest.c // ============================== // // Part of anyexec2c project // // https://github.com/exyi/anyexec2C/tree/master/tools // // // // Tests memory limits of the sandbox, measured in blocks of BLOCK_SIZE // // Exit code 254 probably means that the limit has not been reached when that many blocks were allocated // // Exit code 255 is some error // // #include <stdlib.h> // #include <unistd.h> // #include <sys/types.h> // #include <sys/wait.h> // // #define BLOCK_SIZE 10241024 // // int child(int pipe_write) { // for (int aloc = 0; aloc < 254; aloc++) { // size_t size = BLOCK_SIZE; // // // prevents optimalization by compiler // unsigned char volatile data = (unsigned char*)malloc(size); // if (data == NULL) { // return 1; // } // // // force it to really work with the data - prevents COW // for (int i = 0; i < size; i += 4000) { // data[i] += 17 + i; // } //
// // child still alive - make parent know // // try until a char is written or run out of time // while(write(pipe_write, ".", 1) != 1); // } // return 0; // } // // int parent(int pipe_read) { // char c; // int nblocks = 0; // for(;;) // switch(read(pipe_read, &c, 1)) { // case 0: // eof // return nblocks; // case 1: // character read // nblocks++; // case -1: // error // ; // try until a char is read or run out of time // } // } // // int main() { // int pipefd[2]; // if(pipe(pipefd) == -1) // return 255; // pid_t pid = fork(); // if(pid == 0) { // close(pipefd[0]); // return child(pipefd[1]); // 1 = write end // } // if(pid > 0) { // close(pipefd[1]); // return parent(pipefd[0]); // 0 = read end // } // // fork error: // return 255; // }

using System; using System.IO; using System.Runtime.InteropServices;

namespace mujprogram { class Proram { const string binaryName = "myBinaryPayload";

    static void extract(string payload, string filename) {
        int len = 0;
        byte[] binary = Convert.FromBase64String(payload);
        File.WriteAllBytes(filename, binary);
        // does not hurt if everything has all permissions allowed
        chmod(filename, 511);
    }

    const string executable = 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    public static int Main(string[] args) {
        extract(executable, binaryName);

        

        var args2 = new string[args.Length + 1];
        args2[0] = binaryName;
        Array.Copy(args, 0, args2, 1, args.Length);
        execv(binaryName, args2);
        return 2;
    }

    [DllImport("libc.so.6")]

    public static extern int chmod(string message, int a);

    [DllImport("libc.so.6")]
    public static extern int execv(string binary, string[] args);
}

}