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Re: [RFC] Add pthread_detach_pwd call.
- From: OndÅej BÃlka <neleai at seznam dot cz>
- To: Florian Weimer <fweimer at redhat dot com>
- Cc: Rich Felker <dalias at aerifal dot cx>, libc-alpha at sourceware dot org
- Date: Mon, 21 Oct 2013 14:13:36 +0200
- Subject: Re: [RFC] Add pthread_detach_pwd call.
- Authentication-results: sourceware.org; auth=none
- References: <20131020174109 dot GA17943 at domone dot podge> <20131020222505 dot GK20515 at brightrain dot aerifal dot cx> <5264FD5D dot 6040605 at redhat dot com>
On Mon, Oct 21, 2013 at 12:09:33PM +0200, Florian Weimer wrote:
> On 10/21/2013 12:25 AM, Rich Felker wrote:
>
> >There is already a clean, portable way to achieve the exact same
> >thing: the *at functions.
>
> fsetxattrat is missing, though. Probably more.
>
> I also don't see how we can actually implement something like
> pthread_detach_pwd without adding and awful lot of wrappers. It's
> certainly not just open and fopen, but anything that expects a path
> name.
>
I expected that there is only limited number of primitives that access
internal structure.
> (By the way, I think UID and GID are more problematic in this area.)
>
They are but per-thread behavior would probably require cooperation with
kernel.
Or ugly hacks like global lock on open and calling seteuid if they
disagree.
> --
> Florian Weimer / Red Hat Product Security Team