linux-kernel - Re: [PATCH RFC 1/7] x86/head/64: Mark startup_gdt and startup_gdt_descr as _

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Message-ID: <ZS/FZAq6lbxXtBtB@gmail.com>
Date:   Wed, 18 Oct 2023 13:45:40 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     "H. Peter Anvin" <hpa@...or.com>,
        Kristen Carlson Accardi <kristen@...ux.intel.com>
Cc:     Hou Wenlong <houwenlong.hwl@...group.com>,
        linux-kernel@...r.kernel.org,
        Lai Jiangshan <jiangshan.ljs@...group.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "maintainer:X86 ARCHITECTURE 32-BIT AND 64-BIT" <x86@...nel.org>,
        Josh Poimboeuf <jpoimboe@...nel.org>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Mike Rapoport <rppt@...nel.org>,
        Pasha Tatashin <pasha.tatashin@...een.com>
Subject: Re: [PATCH RFC 1/7] x86/head/64: Mark startup_gdt and
 startup_gdt_descr as __initdata


* H. Peter Anvin <hpa@...or.com> wrote:

> If the goal is better KASLR, then what we really should spend time on was 
> Kristen Accardi's fgKASLR patches, which not only exponentially(!) 
> increases the randomization entrophy but also *actually* avoids the "one 
> leak and it's over" problem.

Agreed. Going by this version of function-granularity KASLR from 3 years 
ago:

  https://lwn.net/Articles/824307/
  https://lwn.net/ml/linux-kernel/20200623172327.5701-1-kristen@linux.intel.com/

The fgKASLR feature looks entirely viable to me. Back then I presumed it 
would get iterated beyond v3, and then it fell off my radar. :-/

If Kristen or someone else would like to dust this off & submit a fresh 
version it would be much appreciated!

Thanks,

	Ingo