Re: High UID support for Linux

H. Peter Anvin (hpa@transmeta.com)
1 Dec 1998 17:26:15 GMT

Followup to: <5liufwy8bs.fsf@tequila.cs.yale.edu>
By author: Stefan Monnier <monnier+lists/linux/kernel/news/@tequila.cs.yale.edu>
In newsgroup: linux.dev.kernel
>
> > Incidentally, remember that not all programs will load registers in
> > the same order, and that the arguments pushed on the stack are not
> > necessarily done consecutively...
>
> And since the problem is to replace getpwent with getenv(HOME), you have to
> recognize that the output of getpwent is only used to extract the home
> directory and then patch it up correctly. So much trouble, so little gain.
>

It's also important to recognize that using getpwent to extract one's
own home directory is *WRONG*. HOME and USER may point to a different
place/user than getuid() and getpwuid(getuid()) will give you; this is
quite common for setuid programs and when using su -m.

-hpa

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