linux-kernel - [RFC PATCH v3 06/15] crypto: arm/chacha20 - limit the preemption-disabled section

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: <20181105232526.173947-7-ebiggers@kernel.org>
Date:   Mon,  5 Nov 2018 15:25:17 -0800
From:   Eric Biggers <ebiggers@...nel.org>
To:     linux-crypto@...r.kernel.org
Cc:     linux-fscrypt@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Paul Crowley <paulcrowley@...gle.com>,
        Greg Kaiser <gkaiser@...gle.com>,
        "Jason A . Donenfeld" <Jason@...c4.com>,
        Samuel Neves <samuel.c.p.neves@...il.com>,
        Tomer Ashur <tomer.ashur@...t.kuleuven.be>
Subject: [RFC PATCH v3 06/15] crypto: arm/chacha20 - limit the preemption-disabled section

From: Eric Biggers <ebiggers@...gle.com>

To improve responsivesess, disable preemption for each step of the walk
(which is at most PAGE_SIZE) rather than for the entire
encryption/decryption operation.

Suggested-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>
Signed-off-by: Eric Biggers <ebiggers@...gle.com>
---
 arch/arm/crypto/chacha20-neon-glue.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/arm/crypto/chacha20-neon-glue.c b/arch/arm/crypto/chacha20-neon-glue.c
index 7386eb1c1889..2bc035cb8f23 100644
--- a/arch/arm/crypto/chacha20-neon-glue.c
+++ b/arch/arm/crypto/chacha20-neon-glue.c
@@ -68,22 +68,22 @@ static int chacha20_neon(struct skcipher_request *req)
 	if (req->cryptlen <= CHACHA_BLOCK_SIZE || !may_use_simd())
 		return crypto_chacha_crypt(req);
 
-	err = skcipher_walk_virt(&walk, req, true);
+	err = skcipher_walk_virt(&walk, req, false);
 
 	crypto_chacha_init(state, ctx, walk.iv);
 
-	kernel_neon_begin();
 	while (walk.nbytes > 0) {
 		unsigned int nbytes = walk.nbytes;
 
 		if (nbytes < walk.total)
 			nbytes = round_down(nbytes, walk.stride);
 
+		kernel_neon_begin();
 		chacha20_doneon(state, walk.dst.virt.addr, walk.src.virt.addr,
 				nbytes);
+		kernel_neon_end();
 		err = skcipher_walk_done(&walk, walk.nbytes - nbytes);
 	}
-	kernel_neon_end();
 
 	return err;
 }
-- 
2.19.1.930.g4563a0d9d0-goog