From owner-svn-src-all@FreeBSD.ORG Tue Dec 16 18:28:34 2014 Return-Path: Delivered-To: svn-src-all@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 477D6A05; Tue, 16 Dec 2014 18:28:34 +0000 (UTC) Received: from svn.freebsd.org (svn.freebsd.org [IPv6:2001:1900:2254:2068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 338078DC; Tue, 16 Dec 2014 18:28:34 +0000 (UTC) Received: from svn.freebsd.org ([127.0.1.70]) by svn.freebsd.org (8.14.9/8.14.9) with ESMTP id sBGISYxV030661; Tue, 16 Dec 2014 18:28:34 GMT (envelope-from kib@FreeBSD.org) Received: (from kib@localhost) by svn.freebsd.org (8.14.9/8.14.9/Submit) id sBGISYtL030660; Tue, 16 Dec 2014 18:28:34 GMT (envelope-from kib@FreeBSD.org) Message-Id: <201412161828.sBGISYtL030660@svn.freebsd.org> X-Authentication-Warning: svn.freebsd.org: kib set sender to kib@FreeBSD.org using -f From: Konstantin Belousov Date: Tue, 16 Dec 2014 18:28:34 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r275833 - head/sys/amd64/amd64 X-SVN-Group: head MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 16 Dec 2014 18:28:34 -0000 Author: kib Date: Tue Dec 16 18:28:33 2014 New Revision: 275833 URL: https://svnweb.freebsd.org/changeset/base/275833 Log: The iret instruction may generate #np and #ss fault, besides #gp. When returning to usermode, the handler for that exceptions is also executed with wrong gs base. Handle all three possible faults in the same way, checking for iret fault, and performing full iret. Sponsored by: The FreeBSD Foundation MFC after: 3 days Modified: head/sys/amd64/amd64/exception.S Modified: head/sys/amd64/amd64/exception.S ============================================================================== --- head/sys/amd64/amd64/exception.S Tue Dec 16 17:59:05 2014 (r275832) +++ head/sys/amd64/amd64/exception.S Tue Dec 16 18:28:33 2014 (r275833) @@ -153,9 +153,13 @@ IDTVEC(xmm) IDTVEC(tss) TRAP_ERR(T_TSSFLT) IDTVEC(missing) - TRAP_ERR(T_SEGNPFLT) + subq $TF_ERR,%rsp + movl $T_SEGNPFLT,TF_TRAPNO(%rsp) + jmp prot_addrf IDTVEC(stk) - TRAP_ERR(T_STKFLT) + subq $TF_ERR,%rsp + movl $T_STKFLT,TF_TRAPNO(%rsp) + jmp prot_addrf IDTVEC(align) TRAP_ERR(T_ALIGNFLT) @@ -318,6 +322,7 @@ IDTVEC(page) IDTVEC(prot) subq $TF_ERR,%rsp movl $T_PROTFLT,TF_TRAPNO(%rsp) +prot_addrf: movq $0,TF_ADDR(%rsp) movq %rdi,TF_RDI(%rsp) /* free up a GP register */ leaq doreti_iret(%rip),%rdi