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Update to set gid

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Michael Zhang 2017-03-12 01:47:50 -06:00 committed by GitHub
parent 2910645c96
commit 34378eba52
1 changed files with 4 additions and 0 deletions
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doubly-dangerous/doubly_dangerous.c
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@ -1,13 +1,17 @@
//compile with: //compile with:
//gcc -m32 -std=c99 -Wall -fno-stack-protector doubly_dangerous.c -o doubly_dangerous //gcc -m32 -std=c99 -Wall -fno-stack-protector doubly_dangerous.c -o doubly_dangerous
#define _GNU_SOURCE
#include <stdlib.h> #include <stdlib.h>
#include <unistd.h> #include <unistd.h>
#include <stdio.h> #include <stdio.h>
#include <string.h> #include <string.h>
#include <sys/types.h>
void give_flag() { void give_flag() {
FILE *f = fopen("flag.txt", "r"); FILE *f = fopen("flag.txt", "r");
gid_t gid = getegid();
setresgid(gid, gid, gid);
if (f != NULL) { if (f != NULL) {
char c; char c;