linux-kernel - Re: [PATCH] x86/mm/init_32: Don't print out kernel memory layout if KASLR

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Message-ID: <202002291534.ED372CC@keescook>
Date:   Sat, 29 Feb 2020 15:51:45 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Arvind Sankar <nivedita@...m.mit.edu>
Cc:     dave.hansen@...ux.intel.com, kernel-hardening@...ts.openwall.com,
        linux-kernel@...r.kernel.org, luto@...nel.org, me@...in.cc,
        peterz@...radead.org, tycho@...ho.ws, x86@...nel.org
Subject: Re: [PATCH] x86/mm/init_32: Don't print out kernel memory layout if
 KASLR

Arvind Sankar said:
> For security, only show the virtual kernel memory layout if KASLR is
> disabled.

These have been entirely removed on other architectures, so let's
just do the same for ia32 and remove it unconditionally.

071929dbdd86 ("arm64: Stop printing the virtual memory layout")
1c31d4e96b8c ("ARM: 8820/1: mm: Stop printing the virtual memory layout")
31833332f798 ("m68k/mm: Stop printing the virtual memory layout")
fd8d0ca25631 ("parisc: Hide virtual kernel memory layout")
adb1fe9ae2ee ("mm/page_alloc: Remove kernel address exposure in free_reserved_area()")

-Kees

-- 
Kees Cook