linux-kernel - Re: [PATCH v2] mac80211: LLVMLinux: Remove VLAIS usage from mac80211

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Message-ID: <CABikg9x+Z95bHcDc6iu5hBvRNO-ibM8-34_qA+OA_FjB52SPMw@mail.gmail.com>
Date:	Sun, 9 Mar 2014 00:00:19 +0100
From:	Sergei Antonov <saproj@...il.com>
To:	pageexec@...email.hu
Cc:	behanw@...verseincode.com, John Linville <linville@...driver.com>,
	Johannes Berg <johannes@...solutions.net>, davem@...emloft.net,
	linux-wireless <linux-wireless@...r.kernel.org>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	David Woodhouse <dwmw2@...radead.org>,
	Jan-Simon Möller <dl9pf@....de>,
	Vinícius Tinti <viniciustinti@...il.com>,
	Mark Charlebois <charlebm@...il.com>
Subject: Re: [PATCH v2] mac80211: LLVMLinux: Remove VLAIS usage from mac80211

On 8 March 2014 23:01, PaX Team <pageexec@...email.hu> wrote:
> On 8 Mar 2014 at 21:29, Sergei Antonov wrote:
>
>> > -       memset(&aead_req, 0, sizeof(aead_req));
>> > +       char aead_req_data[sizeof(struct aead_request) +
>> > +                               crypto_aead_reqsize(tfm) +
>> > +                               CRYPTO_MINALIGN] CRYPTO_MINALIGN_ATTR;
>                                                      ^^^^^^^^^^^^^^^^^^^^
> wouldn't the underlined attribute ensure the required alignment?
Yes. Sorry, I overlooked it.

I would remove unneeded CRYPTO_MINALIGN and get the alignment from the
target structure:
        char aead_req_data[sizeof(struct aead_request) +
                           crypto_aead_reqsize(tfm)]
                __attribute__((__aligned__(__alignof__(struct aead_request))));
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