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#include <unistd.h>
#include <fcntl.h>
char * const argv[] = {"cat", 0};
char * const envp[] = {"A=1", "X", "C=3", 0};
int main(void) {
/* Close stderr on exec so parent can wait for the execve to
* finish. */
if (fcntl(2, F_SETFD, FD_CLOEXEC) != 0)
return 0;
return execve("/bin/cat", argv, envp);
}
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is root.
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