linux-kernel - Re: [PATCH v6 27/29] x86/boot/compressed: Remove, discard, or assert for unwanted sections

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Message-ID: <20200821200159.GC1475504@rani.riverdale.lan>
Date:   Fri, 21 Aug 2020 16:01:59 -0400
From:   Arvind Sankar <nivedita@...m.mit.edu>
To:     Kees Cook <keescook@...omium.org>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Mark Rutland <mark.rutland@....com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Peter Collingbourne <pcc@...gle.com>,
        James Morse <james.morse@....com>,
        Borislav Petkov <bp@...e.de>, Ingo Molnar <mingo@...hat.com>,
        Russell King <linux@...linux.org.uk>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Arvind Sankar <nivedita@...m.mit.edu>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nathan Chancellor <natechancellor@...il.com>,
        Arnd Bergmann <arnd@...db.de>, x86@...nel.org,
        clang-built-linux@...glegroups.com, linux-arch@...r.kernel.org,
        linux-efi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 27/29] x86/boot/compressed: Remove, discard, or assert
 for unwanted sections

On Fri, Aug 21, 2020 at 12:43:08PM -0700, Kees Cook wrote:
> In preparation for warning on orphan sections, stop the linker from
> generating the .eh_frame* sections, discard unwanted non-zero-sized
> generated sections, and enforce other expected-to-be-zero-sized sections
> (since discarding them might hide problems with them suddenly gaining
> unexpected entries).
> 
> Signed-off-by: Kees Cook <keescook@...omium.org>
>  	.rel.dyn : {
> -		*(.rel.*)
> +		*(.rel.*) *(.rel_*)
>  	}
>  	ASSERT(SIZEOF(.rel.dyn) == 0, "Unexpected run-time relocations (.rel) detected!")
>  
>  	.rela.dyn : {
> -		*(.rela.*)
> +		*(.rela.*) *(.rela_*)
>  	}
>  	ASSERT(SIZEOF(.rela.dyn) == 0, "Unexpected run-time relocations (.rela) detected!")
>  }
> -- 
> 2.25.1
> 

When do you get .rela_?