Re: [gentoo-musl] realpath() gives wrong result on a chroot musl system

["Anthony G. Basile" <blueness@gentoo.org>]

On 6/6/16 10:11 AM, Lei Zhang wrote:
> Hi,
> 
> I was trying to run clang (built specifically for musl) on a chroot
> musl system, and met some strange issue. After some investigation, it
> turns out the function realpath() is giving me wrong results.
> 
> I can reproduce the error with the following code snippet:
> 
> #include <stdio.h>
> #include <stdlib.h>
> #include <limits.h>
> 
> int main(int argc, char** argv) {
>     const char* path = "/usr/bin/clang"; // suppose this is a valid path
>     char resolved[PATH_MAX];
>     char* ret = realpath(path, resolved);
> 
>     if (ret)
>         printf("%s\n", ret);
> }
> 
> If I build it against musl, it gives correct result on my host, but
> wrong result on chroot; If I build it against glibc (statically, since
> there's no glibc on chroot), it gives correct results on both
> environments. So it looks like musl is to blame on the chroot
> environment. I haven't yet confirmed if it's a bug.
> 
> Any thoughts?
> 
> BTW, I built my musl system with the GRS tool, using the
> desktop-amd64-musl-hardened profile.
> 
> 
> Regards,
> Lei
> 

open a bug report with steps to reproduce.  realpath is spec-ed in
POSIX.1-2001, take a look at the opengroup page for it.  also print out
the errno in case one is set.



-- 
Anthony G. Basile, Ph.D.
Gentoo Linux Developer [Hardened]
E-Mail    : blueness@gentoo.org
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