Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753428AbbKJOqF (ORCPT ); Tue, 10 Nov 2015 09:46:05 -0500 Received: from bombadil.infradead.org ([198.137.202.9]:56588 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752826AbbKJOqD (ORCPT ); Tue, 10 Nov 2015 09:46:03 -0500 Message-ID: <1447166756.81031.66.camel@infradead.org> Subject: Re: [PATCH 4/4] iommu/vt-d: Do access checks before calling handle_mm_fault() From: David Woodhouse To: Joerg Roedel , iommu@lists.linux-foundation.org Cc: Oded Gabbay , Linus Torvalds , linux-kernel@vger.kernel.org, Joerg Roedel , jbarnes@virtuousgeek.org Date: Tue, 10 Nov 2015 14:45:56 +0000 In-Reply-To: <1447162006-20672-5-git-send-email-joro@8bytes.org> References: <1447162006-20672-1-git-send-email-joro@8bytes.org> <1447162006-20672-5-git-send-email-joro@8bytes.org> Content-Type: multipart/signed; micalg="sha-1"; protocol="application/x-pkcs7-signature"; boundary="=-bgzL4KFShZK1v1SF6hRE" X-Mailer: Evolution 3.18.1 (3.18.1-1.fc23) Mime-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 9824 Lines: 164 --=-bgzL4KFShZK1v1SF6hRE Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2015-11-10 at 14:26 +0100, Joerg Roedel wrote: > From: Joerg Roedel >=20 > Not doing so is a bug and might trigger a BUG_ON in > handle_mm_fault(). So add the proper permission checks > before calling into mm code. >=20 > Signed-off-by: Joerg Roedel > +static bool access_error(struct vm_area_struct *vma, struct > page_req_dsc *req) > +{ > + return !((req->rd_req=C2=A0=C2=A0&& (vma->vm_flags & VM_READ))=C2=A0=C2= =A0|| > + =C2=A0(req->wr_req=C2=A0=C2=A0&& (vma->vm_flags & VM_WRITE)) || > + =C2=A0(req->exe_req && (vma->vm_flags & VM_EXEC))); > +} > + This is a TLB fill request from the device =E2=80=94 can it not be asking f= or *all* of read, write and exec privs? And you allow it to succeed if any *one* of the permissions that it asks for is available? Even if we don't see read+write in the same request, the VT-d spec does seem quite clear that we *will* see read+exec (=C2=A77.5.1.1 p7-17 of v2.3: =E2=80=A2 Execute Requested: If the PASID Present, Read Requested and Execu= te =C2=A0 Requested fields are all 1, the request-with-PASID that encountered= =C2=A0 =C2=A0 the recoverable fault that resulted in this page request, requires= =C2=A0 =C2=A0 execute access to the page. Also, I'm afraid my Skylake box blew up the day I sent the pull request to Linus so I'm unable to test until I've sorted out a replacement. Jesse should be able to though... --=20 David Woodhouse Open Source Technology Centre David.Woodhouse@intel.com Intel Corporation --=-bgzL4KFShZK1v1SF6hRE Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIISjjCCBicw ggUPoAMCAQICAw3vNzANBgkqhkiG9w0BAQUFADCBjDELMAkGA1UEBhMCSUwxFjAUBgNVBAoTDVN0 YXJ0Q29tIEx0ZC4xKzApBgNVBAsTIlNlY3VyZSBEaWdpdGFsIENlcnRpZmljYXRlIFNpZ25pbmcx ODA2BgNVBAMTL1N0YXJ0Q29tIENsYXNzIDEgUHJpbWFyeSBJbnRlcm1lZGlhdGUgQ2xpZW50IENB MB4XDTE1MDUwNTA5NDM0MVoXDTE2MDUwNTA5NTMzNlowQjEcMBoGA1UEAwwTZHdtdzJAaW5mcmFk ZWFkLm9yZzEiMCAGCSqGSIb3DQEJARYTZHdtdzJAaW5mcmFkZWFkLm9yZzCCASIwDQYJKoZIhvcN AQEBBQADggEPADCCAQoCggEBAMkbm9kPbx1j/X4RVyf/pPKSYwelcco69TvnQQbKM8m8xkWjXJI1 jpJ1jMaGUZGFToINMSZi7lZawUozudWbXSKy1SikENSTJHffsdRAIlsp+hR8vWvjsKUry6sEdqPG doa5RY7+N4WRusWZDYW/RRWE6i9EL9qV86CVPYqw22UBOUw4/j/HVGCV6TSB8yE5iEwhk/hUuzRr 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