linux-kernel - Re: [PATCH 1/3] kallsyms: don't leak address when symbol not found

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Message-ID: <5b86abe3-2c9d-1396-777d-a5a8f19555ef@nbd.name>
Date:   Mon, 18 Dec 2017 10:55:34 +0100
From:   Felix Fietkau <nbd@....name>
To:     "Tobin C. Harding" <me@...in.cc>,
        kernel-hardening@...ts.openwall.com
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        Tycho Andersen <tycho@...ho.ws>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Alexei Starovoitov <ast@...nel.org>,
        linux-kernel@...r.kernel.org,
        Network Development <netdev@...r.kernel.org>
Subject: Re: [PATCH 1/3] kallsyms: don't leak address when symbol not found

On 2017-12-18 00:53, Tobin C. Harding wrote:
> Currently if kallsyms_lookup() fails to find the symbol then the address
> is printed. This potentially leaks sensitive information. Instead of
> printing the address we can return an error, giving the calling code the
> option to print the address or print some sanitized message.
> 
> Return error instead of printing address to argument buffer. Leave
> buffer in a sane state.
> 
> Signed-off-by: Tobin C. Harding <me@...in.cc>
I think there should be a way to keep the old behavior for debugging.

- Felix