[PATCH v2 7/8] exec: Generic execfd support

[Eric W. Biederman]

Linus Torvalds <torvalds at linux-foundation.org> writes:

> On Tue, May 19, 2020 at 12:46 PM Kees Cook <keescook at chromium.org> wrote:
>>
>> Though frankly, I wonder if interp_flags could just be removed in favor
>> of two new bit members, especially since interp_data is gone:
>
> Yeah, I think that might be a good cleanup - but please keep it as a
> separate thing at the end of the series (or maybe the beginning)

I will.

With a little care we can replace setting BINPRM_FLAGS_ENFORCE_NONDUMP
and clearing bprm->mm->dumpable.

Which is the direction I have been looking.

Now that I think about it I believe that the loop in exec_binprm should
be clearing BINPRM_FLAGS_PATH_INACCESSIBLE as it is only relevant to
fexec/execveat with a close on exec file descriptor.

Eric