On Thu, 13 Nov 2014 14:42:58 +0000 David Drysdale [off-list ref] wrote:

On Wed, Nov 12, 2014 at 9:50 PM, Andrew Morton
[off-list ref] wrote:

quoted

On Fri,  7 Nov 2014 17:01:01 +0000 David Drysdale [off-list ref] wrote:

quoted

This patch set adds execveat(2) for x86, and is derived from Meredydd
Luff's patch from Sept 2012 (https://lkml.org/lkml/2012/9/11/528).

The primary aim of adding an execveat syscall is to allow an
implementation of fexecve(3) that does not rely on the /proc
filesystem, at least for executables (rather than scripts).  The
current glibc version of fexecve(3) is implemented via /proc, which
causes problems in sandboxed or otherwise restricted environments.

Have the relevant glibc people seen/reviewed/liked this?

I think it's been mentioned in passing but not explicitly discussed over there
(https://sourceware.org/ml/libc-alpha/2014-10/msg00497.html,
https://sourceware.org/ml/libc-alpha/2014-10/msg00509.html)
and a couple of the participants in that thread (Christoph Hellwig, Rich Felker)
were also cc:ed here.

It sounded like execveat might be useful for another feature (O_EXEC) but
I'm not sure whether that amounts to the relevant glibc folk liking this...

OK.  Could you please try to hunt down the appropriate people and give
them a poke?  We'd be in a mess if we merged this then glibc didn't use
it, or glibc developers required/suggested any interface modifications.