linux-kernel - Re: [PATCH 0/3] Unexport kallsyms_lookup_name() and kallsyms_on_each

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Date:   Tue, 25 Feb 2020 11:05:39 +0100 (CET)
From:   Miroslav Benes <mbenes@...e.cz>
To:     Will Deacon <will@...nel.org>
cc:     linux-kernel@...r.kernel.org, kernel-team@...roid.com,
        akpm@...ux-foundation.org,
        "K . Prasad" <prasad@...ux.vnet.ibm.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Frederic Weisbecker <frederic@...nel.org>,
        Christoph Hellwig <hch@....de>,
        Quentin Perret <qperret@...gle.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        live-patching@...r.kernel.org
Subject: Re: [PATCH 0/3] Unexport kallsyms_lookup_name() and
 kallsyms_on_each_symbol()

CC live-patching ML, because this could affect many of its users...

On Fri, 21 Feb 2020, Will Deacon wrote:

> Hi folks,
> 
> Despite having just a single modular in-tree user that I could spot,
> kallsyms_lookup_name() is exported to modules and provides a mechanism
> for out-of-tree modules to access and invoke arbitrary, non-exported
> kernel symbols when kallsyms is enabled.
> 
> This patch series fixes up that one user and unexports the symbol along
> with kallsyms_on_each_symbol(), since that could also be abused in a
> similar manner.
> 
> Cheers,
> 
> Will
> 
> Cc: K.Prasad <prasad@...ux.vnet.ibm.com>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: Frederic Weisbecker <frederic@...nel.org>
> Cc: Christoph Hellwig <hch@....de>
> Cc: Quentin Perret <qperret@...gle.com>
> Cc: Alexei Starovoitov <ast@...nel.org>
> Cc: Masami Hiramatsu <mhiramat@...nel.org>
> 
> --->8
> 
> Will Deacon (3):
>   samples/hw_breakpoint: Drop HW_BREAKPOINT_R when reporting writes
>   samples/hw_breakpoint: Drop use of kallsyms_lookup_name()
>   kallsyms: Unexport kallsyms_lookup_name() and
>     kallsyms_on_each_symbol()
> 
>  kernel/kallsyms.c                       |  2 --
>  samples/hw_breakpoint/data_breakpoint.c | 11 ++++++++---
>  2 files changed, 8 insertions(+), 5 deletions(-)
> 
> -- 
> 2.25.0.265.gbab2e86ba0-goog
>