From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_1 autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E3F85C4363C for ; Wed, 7 Oct 2020 08:50:37 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 7826221D90 for ; Wed, 7 Oct 2020 08:50:37 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="vPBgeH3N" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7826221D90 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References:Message-ID: Subject:To:From:Date:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=m+rVKb3hVTQRM8HJAvitEYhUkUU6/IpUeMaKkGaFJjQ=; b=vPBgeH3NK0a+rpJdCwNw11Ug4 vDD3PHfPVo7//JRb+xbX7ZEb5AYEMHwdjgpmffJmurYRQqOLu7xJimHn1hpha1qT8pP5DGIZW0kZQ ru6SQbhlubNQUOasYhfxbCrCQ60ltOY5pyN3EZAcKIroiuKaNxNLzp4ulU2A4T4BfoCzkvTeYZnba MrSYgBwjFKu3QLYpZVv+NU82EDZXh4NVa+Htenh9e+LrsO6rJkeL6sCw5JUBTR7Fag0OjpHR8Q9z3 z7xVpB1UVZGPyLGj+Bh/Ki3fdfDdz2WfBAdvy4U/VHv2FTdMl/hAAXrorQKgqzGBbkeYQ4LEqhPbF 71FL1klcQ==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kQ58S-0007rg-Kg; Wed, 07 Oct 2020 08:49:20 +0000 Received: from foss.arm.com ([217.140.110.172]) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kQ58P-0007qM-8w for linux-arm-kernel@lists.infradead.org; Wed, 07 Oct 2020 08:49:18 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id C4644113E; Wed, 7 Oct 2020 01:49:15 -0700 (PDT) Received: from arm.com (usa-sjc-imap-foss1.foss.arm.com [10.121.207.14]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 711A63F71F; Wed, 7 Oct 2020 01:49:14 -0700 (PDT) Date: Wed, 7 Oct 2020 09:49:11 +0100 From: Dave Martin To: Jeremy Linton Subject: Re: [BUG][PATCH v3] crypto: arm64: Use x16 with indirect branch to bti_c Message-ID: <20201007084909.GC6642@arm.com> References: <20201006163326.2780619-1-jeremy.linton@arm.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20201006163326.2780619-1-jeremy.linton@arm.com> User-Agent: Mutt/1.5.23 (2014-03-12) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201007_044917_390653_517B0077 X-CRM114-Status: GOOD ( 20.64 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: herbert@gondor.apana.org.au, catalin.marinas@arm.com, linux-kernel@vger.kernel.org, davem@davemloft.net, broonie@kernel.org, linux-crypto@vger.kernel.org, will@kernel.org, ardb@kernel.org, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Tue, Oct 06, 2020 at 11:33:26AM -0500, Jeremy Linton wrote: > The AES code uses a 'br x7' as part of a function called by > a macro. That branch needs a bti_j as a target. This results > in a panic as seen below. Using x16 (or x17) with an indirect > branch keeps the target bti_c. > > Bad mode in Synchronous Abort handler detected on CPU1, code 0x34000003 -- BTI > CPU: 1 PID: 265 Comm: cryptomgr_test Not tainted 5.8.11-300.fc33.aarch64 #1 > pstate: 20400c05 (nzCv daif +PAN -UAO BTYPE=j-) > pc : aesbs_encrypt8+0x0/0x5f0 [aes_neon_bs] > lr : aesbs_xts_encrypt+0x48/0xe0 [aes_neon_bs] > sp : ffff80001052b730 > > aesbs_encrypt8+0x0/0x5f0 [aes_neon_bs] > __xts_crypt+0xb0/0x2dc [aes_neon_bs] > xts_encrypt+0x28/0x3c [aes_neon_bs] > crypto_skcipher_encrypt+0x50/0x84 > simd_skcipher_encrypt+0xc8/0xe0 > crypto_skcipher_encrypt+0x50/0x84 > test_skcipher_vec_cfg+0x224/0x5f0 > test_skcipher+0xbc/0x120 > alg_test_skcipher+0xa0/0x1b0 > alg_test+0x3dc/0x47c > cryptomgr_test+0x38/0x60 > > Fixes: 0e89640b640d ("crypto: arm64 - Use modern annotations for assembly functions") > Signed-off-by: Jeremy Linton Reviewed-by: Dave Martin Note, if we ended up with any veneered function calls in the mix while x16 is live, this register could get clobbered. Given the self-contained nature of this code though, it seems highly unlikely that we will ever have multiple code sections of external calls here. Cheers ---Dave > --- > arch/arm64/crypto/aes-neonbs-core.S | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/arch/arm64/crypto/aes-neonbs-core.S b/arch/arm64/crypto/aes-neonbs-core.S > index b357164379f6..63a52ad9a75c 100644 > --- a/arch/arm64/crypto/aes-neonbs-core.S > +++ b/arch/arm64/crypto/aes-neonbs-core.S > @@ -788,7 +788,7 @@ SYM_FUNC_START_LOCAL(__xts_crypt8) > > 0: mov bskey, x21 > mov rounds, x22 > - br x7 > + br x16 > SYM_FUNC_END(__xts_crypt8) > > .macro __xts_crypt, do8, o0, o1, o2, o3, o4, o5, o6, o7 > @@ -806,7 +806,7 @@ SYM_FUNC_END(__xts_crypt8) > uzp1 v30.4s, v30.4s, v25.4s > ld1 {v25.16b}, [x24] > > -99: adr x7, \do8 > +99: adr x16, \do8 > bl __xts_crypt8 > > ldp q16, q17, [sp, #.Lframe_local_offset] > -- > 2.25.4 > > > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-kernel@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel