Re: [PATCH] x86, vmlinux.lds: Page-Align end of ..page_aligned sections

[Thomas Gleixner]

Kees,

Kees Cook <keescook@xxxxxxxxxxxx> writes:
> On Tue, Jul 21, 2020 at 11:34:48AM +0200, Joerg Roedel wrote:
>> From: Joerg Roedel <jroedel@xxxxxxx>
>> 
>> Align the end of the .bss..page_aligned and .data..page_aligned section
>> on page-size too. Otherwise the linker might place other objects on the
>> page of the last ..page_aligned object. This is inconsistent with other
>> objects in those sections, which all have their own page.
>
> What problem was actually encountered? (i.e. why is it a problem for the
> other data to be in the page of the page-aligned data? shouldn't those
> data have their own, separate, alignment hint?)

See: lore.kernel.org/r/87sgdmm8u4.fsf@xxxxxxxxxxxxxxxxxxxxxxx

Thanks,

        tglx