Re: [PATCH 4/4] vmlinux.lds.h: Have ORC lookup cover entire _etext - _stext

[Josh Poimboeuf]

On Wed, Oct 13, 2021 at 10:57:42AM -0700, Kees Cook wrote:
> From: Kristen Carlson Accardi <kristen@xxxxxxxxxxxxxxx>
> 
> When using -ffunction-sections to place each function in its own text
> section (so it can be randomized at load time in the future FGKASLR
> series), the linker will place most of the functions into separate .text.*
> sections. SIZEOF(.text) won't work here for calculating the ORC lookup
> table size, so the total text size must be calculated to include .text
> AND all .text.* sections.
> 
> Signed-off-by: Kristen Carlson Accardi <kristen@xxxxxxxxxxxxxxx>
> Reviewed-by: Tony Luck <tony.luck@xxxxxxxxx>
> Tested-by: Tony Luck <tony.luck@xxxxxxxxx>
> Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx>
> [ alobakin: move it to vmlinux.lds.h and make arch-indep ]
> Signed-off-by: Alexander Lobakin <alexandr.lobakin@xxxxxxxxx>
> Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>

Acked-by: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>

-- 
Josh