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

On Fri, 2019-06-07 at 09:58 +0200, Peter Zijlstra wrote:

On Thu, Jun 06, 2019 at 01:06:41PM -0700, Yu-cheng Yu wrote:

quoted

An ELF file's .note.gnu.property indicates features the executable file
can support.  For example, the property GNU_PROPERTY_X86_FEATURE_1_AND
indicates the file supports GNU_PROPERTY_X86_FEATURE_1_IBT and/or
GNU_PROPERTY_X86_FEATURE_1_SHSTK.

With this patch, if an arch needs to setup features from ELF properties,
it needs CONFIG_ARCH_USE_GNU_PROPERTY to be set, and a specific
arch_setup_property().

For example, for X86_64:

int arch_setup_property(void *ehdr, void *phdr, struct file *f, bool inter)
{
	int r;
	uint32_t property;

	r = get_gnu_property(ehdr, phdr, f, GNU_PROPERTY_X86_FEATURE_1_AND,
			     &property);
	...
}

Signed-off-by: H.J. Lu <redacted>
Signed-off-by: Yu-cheng Yu <redacted>

Did HJ write this patch as suggested by that SoB chain? If so, you lost
a From: line on top, if not, the SoB thing is invalid.

I will fix that.

Yu-cheng