linux-kernel - Re: [RFC PATCH 10/21] kernel-hacking: Make DEBUG_{LIST,PLIST,SG,NOTIFIERS} non-debug options

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Message-ID: <20200324164220.GC2518746@kroah.com>
Date:   Tue, 24 Mar 2020 17:42:20 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Will Deacon <will@...nel.org>
Cc:     linux-kernel@...r.kernel.org, Eric Dumazet <edumazet@...gle.com>,
        Jann Horn <jannh@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        Maddie Stone <maddiestone@...gle.com>,
        Marco Elver <elver@...gle.com>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>, kernel-team@...roid.com,
        kernel-hardening@...ts.openwall.com
Subject: Re: [RFC PATCH 10/21] kernel-hacking: Make
 DEBUG_{LIST,PLIST,SG,NOTIFIERS} non-debug options

On Tue, Mar 24, 2020 at 03:36:32PM +0000, Will Deacon wrote:
> The CONFIG_DEBUG_{LIST,PLIST,SG,NOTIFIERS} options can provide useful
> security hardening properties outside of debug scenarios. For example,
> CVE-2019-2215 and CVE-2019-2025 are mitigated with negligible runtime
> overhead by enabling CONFIG_DEBUG_LIST, and this option is already
> enabled by default on many distributions:
> 
> https://googleprojectzero.blogspot.com/2019/11/bad-binder-android-in-wild-exploit.html
> 
> Rename these options across the tree so that the naming better reflects
> their operation and remove the dependency on DEBUG_KERNEL.
> 
> Cc: Maddie Stone <maddiestone@...gle.com>
> Cc: Jann Horn <jannh@...gle.com>
> Cc: Kees Cook <keescook@...omium.org>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org
> Cc: Paul E. McKenney <paulmck@...nel.org>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Signed-off-by: Will Deacon <will@...nel.org>

Reviewed-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>