[Bug libc/23347] overflow at realpath()

["mishra.dhiraj95 at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=23347

--- Comment #2 from Dhiraj <mishra.dhiraj95 at gmail dot com> ---
(In reply to Dmitry V. Levin from comment #1)
> (In reply to Dhiraj from comment #0)
> > At file /io/tst-getcwd-abspath.c line number 46 which is,
> 
> Please note this is a test for #22679.
> 
> > cwd = realpath (".", NULL);
> > 
> > This function does not protect against buffer overflows,
> 
> There are no buffers to overflow in the cited code.
> 
> > and some implementations can overflow internally such as (CWE-120/CWE-785!).
> 
> Please note that you have reached the GNU libc bugzilla.
> 
> > Ensure that the destination buffer is at least of size MAXPATHLEN, andto
> > protect against implementation problems, the input argument should also be
> > checked to ensure it is no larger than MAXPATHLEN.
> 
> Please elaborate.

realpath() output buffers should be large enough to handle the maximum-size
possible result from path manipulation functions, at least of size PATH_MAX

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