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#include <sys/syscall.h>
#include <errno.h>
#include <dirent.h>
#include <unistd.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <fcntl.h>
static int sys_execveat (int dirfd, const char *pathname,
char *const argv[], char *const envp[],
int flags)
{
#if defined(__NR_execveat)
return syscall(__NR_execveat, dirfd, pathname, argv, envp, flags);
#else
errno = ENOSYS;
return -1;
#endif
}
int main()
{
char *argv[] = { "foobar", "execveat exists", NULL };
char *envp[] = { NULL };
DIR *dirp;
int fd;
dirp = opendir("/bin");
if (dirp == NULL) {
perror("execveat");
exit(EXIT_FAILURE);
}
fd = dirfd(dirp);
/* Check valgrind will produce expected warnings for the
various wrong arguments. */
do {
char *mem = malloc(16);
void *t = (void *) &mem[0];
void *z = (void *) -1;
int flag = *((int *) &mem[8]);
sys_execveat(-1, "bin/xecho", argv, envp, 0);
sys_execveat(-1, "xecho", argv, envp, 0);
sys_execveat(fd, "xecho", argv, envp, flag);
sys_execveat(fd, "", argv, envp, 0);
sys_execveat(fd, NULL, argv, envp, 0);
sys_execveat(fd, "xecho", t, envp, 0);
sys_execveat(fd, "xecho", z, envp, 0);
} while (0);
/* Check execveat called with the correct arguments works. */
if (sys_execveat(fd, "echo", argv, envp, 0) == -1) {
perror("execveat");
exit(EXIT_FAILURE);
}
closedir(dirp);
exit(EXIT_SUCCESS);
}
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