From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793748420; b=hPLmUDfbU7wIVLxaLgCP7wGhBlieCXArHoSKZlYhlHLG+CF+FOseo+4Fq+LgWNuQj966 B9SLb3fkbxu3bZ69lvkgP+Hdht2v2kpX1L/Z4u8sPspeaoFnMIv/3bdyI9/lbzBCHcXka wUZKZNP6MXvx4F6NAdN5bW16HZ0xItFSbiaWNgzwmRQ1yRCkyu9hJMLwGohdcjkaBG7KS XgmIx38LQgDSMPI+eieWmScKs4C5uWfp/KYJ5zQWr7RbjQO2b9aLIArAS+Z42OPeMH1Yz Rulh5HZdLX7MaRPuicYot1GjLrbuOL0rpU2zRryrqmT3VVSy5xupGud8B1EAvu8EpFw== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793748420; h=Received:DKIM-Signature:Date:From:To:Cc:Subject:Message-ID: References:MIME-Version:Content-Type:Content-Disposition:In-Reply-To; bh=iZY2pymESxMUDNG2zpkim6DbnJ8AGBQ1GDyjTeqHZ0s=; b=ddveEXeZ0ZJbTjjiStRV2BLo8xylIKHr06Z/5VBeG9AQItAqVmN7wzeEk+nNWTHGfFHd 3yZ3wduTOp8dYZO9ISig/FkWGA5mUtXGDdbko6VQMM8GJpWj0AdcFQIHcHx0WsohhTfzq SNswlHmn7W+0oiMEtw0VkqmfXc+3lMlmkoZOhw3gTpJ00dVnx9p6zgPBGlfpspOUS69nf jrZVxo8eRKJe6FcmJ2tzqhds7J3yFSLOI0HxK5b4R/oFTyhJL47Hx/YvNQk4xNpPYYWeV 4VnOdOPWcHshUfrdxYl0dPhrV9xG1PoZA0kDlzF+ZPdippxS4RN0UA1iO4wAoKh8R3w== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=Rz6t6pxq; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0FFF6606A326 for ; Tue, 3 Nov 2026 23:26:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=Rz6t6pxq Received: by smtp.kernel.org (Postfix) with ESMTPSA id 723E91F00A1A; Tue, 3 Nov 2026 23:26:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793748419; bh=iZY2pymESxMUDNG2zpkim6DbnJ8AGBQ1GDyjTeqHZ0s=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=Rz6t6pxqTjZLVuw/ZLzenQteF01ZGlLC5jJKKvKz1mGJQBJ81hxmZsIwlrJRBwvCI QOws9L930ZxQvCo0f/1lz6FIkAYp3hJo9hACuu4XSKcpkrxB84KdjZhugI/iP6oh+A FKboivqDSUea0oQ3///p4os7RFpmEHKEi6d08impevOkzTTRKD7FtkwlphopYnpWgV cudihJhynQZyoL0wVGtrsDvKAnQG39wSEt1MxlQn6yK5jZXJtvp3g+iqumusjG1Naw Q5Vw5gCZIC+Yx8VTfVDfM0F66M6r216bMDPtRQsLF/B4gLhUWSHPBa28dbPT+o+ZEz ck7B7y5PsuUJw== Date: Tue, 3 Nov 2026 15:26:57 -0800 From: Eric Biggers To: linux-crypto@vger.kernel.org Cc: Ard Biesheuvel , "Jason A . Donenfeld" , Herbert Xu Subject: Re: [PATCH] lib/crypto: gf128hash: Hide selection mask values from compilers Message-ID: <20261103232657.GI2281@quark> References: <20261031052149.201983-1-ebiggers@kernel.org> X-Mailing-List: linux-crypto@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20261031052149.201983-1-ebiggers@kernel.org> On Fri, Oct 30, 2026 at 10:21:49PM -0700, Eric Biggers wrote: > Hide selection mask values from compilers, so that they cannot see that > they are used to select between two values and potentially generate a > secret-dependent branch. This is not known to be happening here, but we > might as well be extra careful. > > Signed-off-by: Eric Biggers > --- > lib/crypto/gf128hash.c | 17 +++++++++++++---- > 1 file changed, 13 insertions(+), 4 deletions(-) Applied to https://git.kernel.org/pub/scm/linux/kernel/git/ebiggers/linux.git/log/?h=libcrypto-next - Eric