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

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Date:   Fri, 21 Feb 2020 11:44:01 +0000
From:   Will Deacon <will@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     kernel-team@...roid.com, akpm@...ux-foundation.org,
        Will Deacon <will@...nel.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>
Subject: [PATCH 0/3] Unexport kallsyms_lookup_name() and kallsyms_on_each_symbol()

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