linux无文件执行elf

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <linux/memfd.h>
#include <sys/syscall.h>
#include <errno.h>
​
int anonyexec(const char *path, char *argv[])
{
    int   fd, fdm, filesize;
    void *elfbuf;
    char  cmdline[256];
​
    fd = open(path, O_RDONLY);
    filesize = lseek(fd, SEEK_SET, SEEK_END);
    lseek(fd, SEEK_SET, SEEK_SET);
    elfbuf = malloc(filesize);
    read(fd, elfbuf, filesize);
    close(fd);
    fdm = syscall(__NR_memfd_create, "elf", MFD_CLOEXEC);
    ftruncate(fdm, filesize);
    write(fdm, elfbuf, filesize);
    free(elfbuf);
    sprintf(cmdline, "/proc/self/fd/%d", fdm);
    argv[0] = cmdline;
    execve(argv[0], argv, NULL);
    free(elfbuf);
    return -1;
}
​
int main()
{
    char *argv[] = {"/bin/name", "-a", NULL};
    int result =anonyexec("/bin/name", argv);
    return result;
}
调试原理
egg hunter
Last modified 3yr ago