linux-kernel - Re: [PATCH] livepatch: Validate module/old func name length

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Message-ID: <nycvar.YFH.7.76.1807231212190.997@cbobk.fhfr.pm>
Date:   Mon, 23 Jul 2018 12:12:30 +0200 (CEST)
From:   Jiri Kosina <jikos@...nel.org>
To:     Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>
cc:     Josh Poimboeuf <jpoimboe@...hat.com>,
        Petr Mladek <pmladek@...e.com>,
        Miroslav Benes <mbenes@...e.cz>, live-patching@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] livepatch: Validate module/old func name length

On Fri, 20 Jul 2018, Kamalesh Babulal wrote:

> livepatch module author can pass module name/old function name with more
> than the defined character limit. With obj->name length greater than
> MODULE_NAME_LEN, the livepatch module gets loaded but waits forever on
> the module specified by obj->name to be loaded. It also populates a /sys
> directory with an untruncated object name.
> 
> In the case of funcs->old_name length greater then KSYM_NAME_LEN, it
> would not match against any of the symbol table entries. Instead loop
> through the symbol table comparing them against a nonexisting function,
> which can be avoided.
> 
> The same issues apply, to misspelled/incorrect names. At least gatekeep
> the modules with over the limit string length, by checking for their
> length during livepatch module registration.
> 
> Signed-off-by: Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>

Applied, thanks.

-- 
Jiri Kosina
SUSE Labs