linux-kernel - Re: [PATCH 03/13] crypto: x86/sha - yield FPU context during long loops

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: <Y6Eyvo7z8uHRF46G@gondor.apana.org.au>
Date:   Tue, 20 Dec 2022 11:57:50 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Robert Elliott <elliott@....com>
Cc:     davem@...emloft.net, Jason@...c4.com, ardb@...nel.org,
        ap420073@...il.com, David.Laight@...lab.com, ebiggers@...nel.org,
        tim.c.chen@...ux.intel.com, peter@...jl.ca, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com,
        linux-crypto@...r.kernel.org, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 03/13] crypto: x86/sha - yield FPU context during long
 loops

On Mon, Dec 19, 2022 at 04:02:13PM -0600, Robert Elliott wrote:
>
> +void __sha1_transform_ssse3(struct sha1_state *state, const u8 *data, int blocks)
> +{
> +	if (blocks <= 0)
> +		return;
> +
> +	kernel_fpu_begin();
> +	for (;;) {
> +		const int chunks = min(blocks, 4096 / SHA1_BLOCK_SIZE);
> +
> +		sha1_transform_ssse3(state->state, data, chunks);
> +		data += chunks * SHA1_BLOCK_SIZE;
> +		blocks -= chunks;
> +
> +		if (blocks <= 0)
> +			break;
> +
> +		kernel_fpu_yield();

Shouldn't this check the MAY_SLEEP flag?

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt