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gwisp2/cleanexec.c

Created February 21, 2023 15:14
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  1. gwisp2 created this gist Feb 21, 2023.
    21 changes: 21 additions & 0 deletions cleanexec.c
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,21 @@
    #include <stdio.h>
    #include <unistd.h>
    #include <sys/syscall.h>
    #include <errno.h>
    #include <string.h>

    int main(int argc, char *argv[]) {
    if (argc < 2) {
    printf("No path to executable to start provided\n");
    return 255;
    }
    if (syscall(SYS_close_range, 3U, ~0U, 0U)) {
    printf("Failed to close file descriptors: %s\n", strerror(errno));
    return 255;
    }
    if (execv(argv[1], &argv[1])) {
    printf("Exec %s failed: %s\n", argv[1], strerror(errno));
    return 255;
    }
    return 0;
    }