Re: [PATCH v2 1/5] fs: Add support for an O_MAYEXEC flag on sys_open()

[Florian Weimer]

Let's assume I want to add support for this to the glibc dynamic loader,
while still being able to run on older kernels.

Is it safe to try the open call first, with O_MAYEXEC, and if that fails
with EINVAL, try again without O_MAYEXEC?

Or do I risk disabling this security feature if I do that?

Do we need a different way for recognizing kernel support.  (Note that
we cannot probe paths in /proc for various reasons.)

Thanks,
Florian