Re: [PATCH v7 22/27] binfmt_elf: Extract .note.gnu.property from an ELF file

On Tue, 2019-06-18 at 18:05 +0200, Florian Weimer wrote:

* Yu-cheng Yu:

quoted

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I assumed that it would also parse the main executable and make
adjustments based on that.

Yes, Linux also looks at the main executable's header, but not its
NT_GNU_PROPERTY_TYPE_0 if there is a loader.

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ld.so can certainly provide whatever the kernel needs.  We need to tweak
the existing loader anyway.

No valid statically-linked binaries exist today, so this is not a
consideration at this point.

So from kernel, we look at only PT_GNU_PROPERTY?

If you don't parse notes/segments in the executable for CET, then yes.
We can put PT_GNU_PROPERTY into the loader.

Thanks!