linux-kernel - Re: [PATCH v4 13/34] test_printf: Drop requirement that sprintf not write past nul

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Date:   Tue, 21 Jun 2022 09:19:55 +0200
From:   Rasmus Villemoes <linux@...musvillemoes.dk>
To:     Kent Overstreet <kent.overstreet@...il.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org, pmladek@...e.com
Cc:     rostedt@...dmis.org, enozhatsky@...omium.org, willy@...radead.org
Subject: Re: [PATCH v4 13/34] test_printf: Drop requirement that sprintf not
 write past nul

On 20/06/2022 02.42, Kent Overstreet wrote:
> The current test code checks that sprintf never writes past the
> terminating nul. This is a rather strange requirement, completely
> separate from writing past the end of the buffer, which of course we
> can't do

And which of course you don't check anymore. So any statement about "all
tests passing after these patches" is not worth much.

So NAK in this form, but perhaps if/when my year-old patch gets picked
up (or you could include it in the series) we can talk about eliminating
the check for past-nul-before-end-of-buffer writes.

Rasmus