From owner-freebsd-bugs@freebsd.org Sun Jul 29 19:17:02 2018 Return-Path: Delivered-To: freebsd-bugs@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 5D226105F53E for ; Sun, 29 Jul 2018 19:17:02 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mailman.ysv.freebsd.org (mailman.ysv.freebsd.org [IPv6:2001:1900:2254:206a::50:5]) by mx1.freebsd.org (Postfix) with ESMTP id CFE9370310 for ; Sun, 29 Jul 2018 19:17:01 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: by mailman.ysv.freebsd.org (Postfix) id 94C66105F53B; Sun, 29 Jul 2018 19:17:01 +0000 (UTC) Delivered-To: bugs@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 5AE13105F53A for ; Sun, 29 Jul 2018 19:17:01 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mxrelay.ysv.freebsd.org (mxrelay.ysv.freebsd.org [IPv6:2001:1900:2254:206a::19:3]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "mxrelay.ysv.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 8751D702E9 for ; Sun, 29 Jul 2018 19:16:59 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2001:1900:2254:206a::16:76]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.ysv.freebsd.org (Postfix) with ESMTPS id 44D4A18FC6 for ; Sun, 29 Jul 2018 19:16:58 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org ([127.0.1.118]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id w6TJGwLP028967 for ; Sun, 29 Jul 2018 19:16:58 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id w6TJGwJ0028966 for bugs@FreeBSD.org; Sun, 29 Jul 2018 19:16:58 GMT (envelope-from bugzilla-noreply@freebsd.org) X-Authentication-Warning: kenobi.freebsd.org: www set sender to bugzilla-noreply@freebsd.org using -f From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 230162] mprotect(2): error converting size argument in 32-bit emulation Date: Sun, 29 Jul 2018 19:16:58 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: kern X-Bugzilla-Version: CURRENT X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Only Me X-Bugzilla-Who: asomers@FreeBSD.org X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: bugs@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_id short_desc product version rep_platform op_sys bug_status bug_severity priority component assigned_to reporter Message-ID: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: freebsd-bugs@freebsd.org X-Mailman-Version: 2.1.27 Precedence: list List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 29 Jul 2018 19:17:02 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D230162 Bug ID: 230162 Summary: mprotect(2): error converting size argument in 32-bit emulation Product: Base System Version: CURRENT Hardware: Any OS: Any Status: New Severity: Affects Only Me Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: asomers@FreeBSD.org The lib/libc/sys/mprotect_test:mprotect_err test fails when run under 32-bit emulation. Examining the problem with dtrace, it looks like there's a cast= ing error; the 32-bit syscall's len argument winds up in the high half of kern_mprotect's size argument. I don't see that behavior when I dtrace msg= snd, another syscall with a size_t argument. Here's an example of the problem. Notice how len=3D0x1 in syscall:freebsd32_mprotect, but 0x100000000 in fbt:kern_mprotect $ sudo dtrace -i 'fbt:kernel:kern_mprotect:entry {printf("addr0=3D%#lx, size=3D%#lx", args[1], args[2]);}' -i 'syscall:freebsd32:freebsd32_mprotect:entry {printf("addr=3D%p len=3D%#lx", args[0], args[1]);}' -i 'fbt:kernel:vm_map_protect:entry {printf("size ~=3D %#lx", args[2] - args[1]);}' dtrace: description 'fbt:kernel:kern_mprotect:entry ' matched 1 probe dtrace: description 'syscall:freebsd32:freebsd32_mprotect:entry ' matched 1 probe dtrace: description 'fbt:kernel:vm_map_protect:entry ' matched 1 probe CPU ID FUNCTION:NAME 2 61769 freebsd32_mprotect:entry addr=3D0 len=3D0 2 28572 kern_mprotect:entry addr0=3D0, size=3D0 2 47917 vm_map_protect:entry size ~=3D 0 3 61769 freebsd32_mprotect:entry addr=3Dffffffff len=3D0x1 3 28572 kern_mprotect:entry addr0=3D0xfffff000, size=3D0x10= 0000000 3 47917 vm_map_protect:entry size ~=3D 0x1000 And in another terminal, in a 32-bit chroot, run # kyua debug mprotect_test:mprotect_err mprotect_test:mprotect_err -> failed: /usr/home/somers/freebsd/base/head/contrib/netbsd-tests/lib/libc/sys/t_mpro= tect.c:158: mprotect((char *)-1, 1, PROT_READ) !=3D 0 not met --=20 You are receiving this mail because: You are the assignee for the bug.=