From owner-svn-src-head@freebsd.org Fri Jan 11 11:32:47 2019 Return-Path: Delivered-To: svn-src-head@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 143D9148B4FB; Fri, 11 Jan 2019 11:32:47 +0000 (UTC) (envelope-from andrew@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) server-signature RSA-PSS (4096 bits) client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 8068094D0A; Fri, 11 Jan 2019 11:32:46 +0000 (UTC) (envelope-from andrew@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 72FEC1B1DD; Fri, 11 Jan 2019 11:32:46 +0000 (UTC) (envelope-from andrew@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id x0BBWkSk011423; Fri, 11 Jan 2019 11:32:46 GMT (envelope-from andrew@FreeBSD.org) Received: (from andrew@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id x0BBWkj2011422; Fri, 11 Jan 2019 11:32:46 GMT (envelope-from andrew@FreeBSD.org) Message-Id: <201901111132.x0BBWkj2011422@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: andrew set sender to andrew@FreeBSD.org using -f From: Andrew Turner Date: Fri, 11 Jan 2019 11:32:46 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r342937 - head/sys/arm64/arm64 X-SVN-Group: head X-SVN-Commit-Author: andrew X-SVN-Commit-Paths: head/sys/arm64/arm64 X-SVN-Commit-Revision: 342937 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 8068094D0A X-Spamd-Bar: -- Authentication-Results: mx1.freebsd.org X-Spamd-Result: default: False [-2.96 / 15.00]; local_wl_from(0.00)[FreeBSD.org]; NEURAL_HAM_MEDIUM(-1.00)[-0.999,0]; NEURAL_HAM_SHORT(-0.96)[-0.961,0]; ASN(0.00)[asn:11403, ipnet:2610:1c1:1::/48, country:US]; NEURAL_HAM_LONG(-1.00)[-0.999,0] X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: SVN commit messages for the src tree for head/-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 11 Jan 2019 11:32:47 -0000 Author: andrew Date: Fri Jan 11 11:32:46 2019 New Revision: 342937 URL: https://svnweb.freebsd.org/changeset/base/342937 Log: Fix the location of td->td_frame at the top of the kernel stack. In cpu_thread_alloc we would allocate space for the trap frame at the top of the kernel stack. This is just below the pcb, however due to a missing cast the pointer arithmetic would use the pcb size, not the trapframe size. As the pcb is larger than the trapframe this is safe, however later in cpu_fork we include the case leading to the two disagreeing on the location. Fix by using the same arithmetic in both locations. Found by: An early KASAN patch Sponsored by: DARPA, AFRL Modified: head/sys/arm64/arm64/vm_machdep.c Modified: head/sys/arm64/arm64/vm_machdep.c ============================================================================== --- head/sys/arm64/arm64/vm_machdep.c Fri Jan 11 09:40:34 2019 (r342936) +++ head/sys/arm64/arm64/vm_machdep.c Fri Jan 11 11:32:46 2019 (r342937) @@ -228,7 +228,7 @@ cpu_thread_alloc(struct thread *td) td->td_pcb = (struct pcb *)(td->td_kstack + td->td_kstack_pages * PAGE_SIZE) - 1; td->td_frame = (struct trapframe *)STACKALIGN( - td->td_pcb - 1); + (struct trapframe *)td->td_pcb - 1); } void