linux-kernel - Re: klp: make object/func-walking helpers more robust

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Fri, 29 Apr 2016 12:26:49 -0400
From:	Jessica Yu <jeyu@...hat.com>
To:	Miroslav Benes <mbenes@...e.cz>
Cc:	jpoimboe@...hat.com, jikos@...nel.org, pmladek@...e.com,
	live-patching@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: klp: make object/func-walking helpers more robust

+++ Miroslav Benes [28/04/16 16:34 +0200]:
>Current object-walking helper checks the presence of obj->funcs to
>determine the end of objs array in klp_object structure. This is
>somewhat fragile because one can easily forget about funcs definition
>during livepatch creation. In such a case the livepatch module is
>successfully loaded and all objects after the incorrect one are omitted.
>This is very confusing. Let's make the helper more robust and check also
>for the other external member, name. Thus the helper correctly stops on
>an empty item of the array. We need to have a check for obj->funcs in
>klp_init_object() to make it work.
>
>The same applies to a func-walking helper.
>
>As a benefit we'll check for new_func member definition during the
>livepatch initialization. There is no such check anywhere in the code
>now.
>
>Signed-off-by: Miroslav Benes <mbenes@...e.cz>

Acked-by: Jessica Yu <jeyu@...hat.com>