linux-hardening - Re: [PATCH 1/2] lib/cmdline_kunit: add test case for memparse()

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]

Message-ID: <533de75be777940d591ea23a41d595c212667baa.camel@yandex.ru>
Date: Thu, 22 Jan 2026 18:00:43 +0300
From: Dmitry Antipov <dmantipov@...dex.ru>
To: Andy Shevchenko <andriy.shevchenko@...el.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>, Kees Cook <kees@...nel.org>, 
 "Darrick J . Wong"
	 <djwong@...nel.org>, linux-hardening@...r.kernel.org
Subject: Re: [PATCH 1/2] lib/cmdline_kunit: add test case for memparse()

On Thu, 2026-01-22 at 13:46 +0200, Andy Shevchenko wrote:

> Can we also have one with more than 20 decimal digits?

Hmmm... running simple userspace test,

strtoull("569202370375329612767", ...)

returns ULLONG_MAX (and sets errno to -ERANGE), but

memparse("569202370375329612767", ...)

seems blindly overflows to -2646695909666487329.

I'm strongly suspecting that 'memparse()' should be carefully
tweaked to use 'kstrtoull()' instead of 'simple_strtoull()'.

Dmitry