On Thu, Apr 30, 2020 at 11:54:29AM +1000, Aleksa Sarai wrote:

On 2020-04-28, Mickaël Salaün [off-list ref] wrote:

quoted

The goal of this patch series is to enable to control script execution
with interpreters help.  A new RESOLVE_MAYEXEC flag, usable through
openat2(2), is added to enable userspace script interpreter to delegate
to the kernel (and thus the system security policy) the permission to
interpret/execute scripts or other files containing what can be seen as
commands.

This third patch series mainly differ from the previous one by relying
on the new openat2(2) system call to get rid of the undefined behavior
of the open(2) flags.  Thus, the previous O_MAYEXEC flag is now replaced
with the new RESOLVE_MAYEXEC flag and benefits from the openat2(2)
strict check of this kind of flags.

My only strong upfront objection is with this being a RESOLVE_ flag.

RESOLVE_ flags have a specific meaning (they generally apply to all
components, and affect the rules of path resolution). RESOLVE_MAYEXEC
does neither of these things and so seems out of place among the other
RESOLVE_ flags.

I would argue this should be an O_ flag, but not supported for the

I agree.

Christian