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Date: Mon, 18 Dec 2017 10:55:34 +0100
From: Felix Fietkau <>
To: "Tobin C. Harding" <>,
Cc: Steven Rostedt <>, Tycho Andersen <>,
 Linus Torvalds <>,
 Kees Cook <>, Andrew Morton
 <>, Daniel Borkmann <>,
 Masahiro Yamada <>,
 Alexei Starovoitov <>,,
 Network Development <>
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 <>
I think there should be a way to keep the old behavior for debugging.

- Felix

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