From: Gabriel Krisman Bertazi <krisman@suse.de>
To: Wojciech Lukowicz <wlukowicz01@gmail.com>
Cc: Jens Axboe <axboe@kernel.dk>, io-uring@vger.kernel.org
Subject: Re: [PATCH liburing] test/buf-ring: add test for buf ring occupying exactly one page
Date: Mon, 20 Feb 2023 11:45:34 -0300 [thread overview]
Message-ID: <875ybwe6pd.fsf@suse.de> (raw)
In-Reply-To: <20230218184618.70966-1-wlukowicz01@gmail.com> (Wojciech Lukowicz's message of "Sat, 18 Feb 2023 18:46:18 +0000")
Wojciech Lukowicz <wlukowicz01@gmail.com> writes:
> This shows an issue with how the kernel calculates buffer ring sizes
> during their registration.
>
> Allocate two pages, register a buf ring fully occupying the first one,
> while protecting the second one to make sure it's not used. The
> registration should succeed.
>
> mmapping a single page would be a more practical example, but wouldn't
> guarantee the issue gets triggered in case the following page happens
> to be accessible.
>
> Signed-off-by: Wojciech Lukowicz <wlukowicz01@gmail.com>
> ---
> This is a failing test, needs the patch I sent earlier.
Reviewed-by: Gabriel Krisman Bertazi <krisman@suse.de>
--
Gabriel Krisman Bertazi
next prev parent reply other threads:[~2023-02-20 14:45 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-02-18 18:46 [PATCH liburing] test/buf-ring: add test for buf ring occupying exactly one page Wojciech Lukowicz
2023-02-20 14:45 ` Gabriel Krisman Bertazi [this message]
2023-02-22 16:54 ` Jens Axboe
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