From nobody Fri Oct 22 23:31:34 2021 X-Original-To: dev-commits-src-all@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 9FEDA180CE26; Fri, 22 Oct 2021 23:31:34 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "R3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4HbgbV4BQ2z4p57; Fri, 22 Oct 2021 23:31:34 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org (gitrepo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:5]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 70C5F17C9A; Fri, 22 Oct 2021 23:31:34 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org ([127.0.1.44]) by gitrepo.freebsd.org (8.16.1/8.16.1) with ESMTP id 19MNVYV7018014; Fri, 22 Oct 2021 23:31:34 GMT (envelope-from git@gitrepo.freebsd.org) Received: (from git@localhost) by gitrepo.freebsd.org (8.16.1/8.16.1/Submit) id 19MNVYlE018013; Fri, 22 Oct 2021 23:31:34 GMT (envelope-from git) Date: Fri, 22 Oct 2021 23:31:34 GMT Message-Id: <202110222331.19MNVYlE018013@gitrepo.freebsd.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org From: Konstantin Belousov Subject: git: 362c6d8dec6d - main - nehemiah: manually assemble xstore(-rng) List-Id: Commit messages for all branches of the src repository List-Archive: https://lists.freebsd.org/archives/dev-commits-src-all List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-dev-commits-src-all@freebsd.org X-BeenThere: dev-commits-src-all@freebsd.org MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Git-Committer: kib X-Git-Repository: src X-Git-Refname: refs/heads/main X-Git-Reftype: branch X-Git-Commit: 362c6d8dec6dfbedc5717e45769042279a1dd3df Auto-Submitted: auto-generated X-ThisMailContainsUnwantedMimeParts: N The branch main has been updated by kib: URL: https://cgit.FreeBSD.org/src/commit/?id=362c6d8dec6dfbedc5717e45769042279a1dd3df commit 362c6d8dec6dfbedc5717e45769042279a1dd3df Author: Konstantin Belousov AuthorDate: 2021-10-20 22:42:05 +0000 Commit: Konstantin Belousov CommitDate: 2021-10-22 23:31:16 +0000 nehemiah: manually assemble xstore(-rng) It seems that clang IAS erronously adds repz prefix which should not be there. Cpu would try to store around %ecx bytes of random, while we only expect a word. PR: 259218 Reported and tested by: Dennis Clarke Sponsored by: The FreeBSD Foundation MFC after: 1 week --- sys/dev/random/nehemiah.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/sys/dev/random/nehemiah.c b/sys/dev/random/nehemiah.c index ba0dfb200ba0..3ad18005c935 100644 --- a/sys/dev/random/nehemiah.c +++ b/sys/dev/random/nehemiah.c @@ -68,7 +68,7 @@ VIA_RNG_store(void *buf) #ifdef __GNUCLIKE_ASM __asm __volatile( "movl $0,%%edx\n\t" - "xstore" + ".byte 0x0f, 0xa7, 0xc0" : "=a" (retval), "+d" (rate), "+D" (buf) : : "memory"