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Message-ID: <alpine.LSU.2.21.2002251104130.11531@pobox.suse.cz>
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
>
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