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Date: Tue, 8 Oct 2019 19:24:02 +0200
From: Reiner Herrmann <reiner@...ner-h.de>
To: musl@...ts.openwall.com
Subject: realpath after chroot
Hi,
I noticed that realpath is no longer working after chroot is called.
With the example from below I get the following output with musl 1.1.23:
# ./a.out
/
No such file or directory
With glibc it is working as I would expect:
# ./a.out
/
/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include <unistd.h>
#include <errno.h>
int main() {
char *p = realpath("/", NULL);
if (!p) {
printf("%s\n", strerror(errno));
} else {
printf("%s\n", p);
free(p);
}
if (chroot("/tmp") == -1)
printf("chroot failed\n");
p = realpath("/", NULL);
if (!p) {
printf("%s\n", strerror(errno));
} else {
printf("%s\n", p);
free(p);
}
return 0;
}
Kind regards,
Reiner
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