From owner-dev-commits-src-all@freebsd.org Tue Mar 30 23:27:49 2021 Return-Path: Delivered-To: dev-commits-src-all@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id AE3095B2612; Tue, 30 Mar 2021 23:27:49 +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 4F95GF4WyJz3m39; Tue, 30 Mar 2021 23:27:49 +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 8E1607492; Tue, 30 Mar 2021 23:27:49 +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 12UNRn8t088524; Tue, 30 Mar 2021 23:27:49 GMT (envelope-from git@gitrepo.freebsd.org) Received: (from git@localhost) by gitrepo.freebsd.org (8.16.1/8.16.1/Submit) id 12UNRnXu088523; Tue, 30 Mar 2021 23:27:49 GMT (envelope-from git) Date: Tue, 30 Mar 2021 23:27:49 GMT Message-Id: <202103302327.12UNRnXu088523@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: 8223717ce62c - main - x86: clear %db registers in new process 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: 8223717ce62c1ad0becc34ce69fe2d1771f3ba05 Auto-Submitted: auto-generated X-BeenThere: dev-commits-src-all@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Commit messages for all branches of the src repository List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 30 Mar 2021 23:27:49 -0000 The branch main has been updated by kib: URL: https://cgit.FreeBSD.org/src/commit/?id=8223717ce62c1ad0becc34ce69fe2d1771f3ba05 commit 8223717ce62c1ad0becc34ce69fe2d1771f3ba05 Author: Konstantin Belousov AuthorDate: 2021-03-30 15:40:02 +0000 Commit: Konstantin Belousov CommitDate: 2021-03-30 23:07:35 +0000 x86: clear %db registers in new process Reported by: Michał Górny PR: 254661 Reviewed by: emaste, jhb MFC after: 1 week Sponsored by: The FreeBSD Foundation Differential revision: https://reviews.freebsd.org/D29496 --- sys/amd64/amd64/vm_machdep.c | 8 ++++++++ sys/i386/i386/vm_machdep.c | 8 ++++++++ 2 files changed, 16 insertions(+) diff --git a/sys/amd64/amd64/vm_machdep.c b/sys/amd64/amd64/vm_machdep.c index f64259decbff..98d212dc8771 100644 --- a/sys/amd64/amd64/vm_machdep.c +++ b/sys/amd64/amd64/vm_machdep.c @@ -229,6 +229,14 @@ cpu_fork(struct thread *td1, struct proc *p2, struct thread *td2, int flags) copy_thread(td1, td2); + /* Reset debug registers in the new process */ + pcb2->pcb_dr0 = 0; + pcb2->pcb_dr1 = 0; + pcb2->pcb_dr2 = 0; + pcb2->pcb_dr3 = 0; + pcb2->pcb_dr6 = 0; + pcb2->pcb_dr7 = 0; + /* Point mdproc and then copy over p1's contents */ mdp2 = &p2->p_md; bcopy(&p1->p_md, mdp2, sizeof(*mdp2)); diff --git a/sys/i386/i386/vm_machdep.c b/sys/i386/i386/vm_machdep.c index c04fb57db4b1..ed40ebe5d1c8 100644 --- a/sys/i386/i386/vm_machdep.c +++ b/sys/i386/i386/vm_machdep.c @@ -241,6 +241,14 @@ cpu_fork(struct thread *td1, struct proc *p2, struct thread *td2, int flags) copy_thread(td1, td2); + /* Reset debug registers in the new process */ + pcb2->pcb_dr0 = 0; + pcb2->pcb_dr1 = 0; + pcb2->pcb_dr2 = 0; + pcb2->pcb_dr3 = 0; + pcb2->pcb_dr6 = 0; + pcb2->pcb_dr7 = 0; + /* Point mdproc and then copy over td1's contents */ mdp2 = &p2->p_md; bcopy(&p1->p_md, mdp2, sizeof(*mdp2));