From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx116.postini.com [74.125.245.116]) by kanga.kvack.org (Postfix) with SMTP id 55F786B006C for ; Sat, 29 Sep 2012 12:11:30 -0400 (EDT) Message-ID: <1348935073.2036.147.camel@shinybook.infradead.org> Subject: Re: mtd: kernel BUG at arch/x86/mm/pat.c:279! From: David Woodhouse Date: Sat, 29 Sep 2012 17:11:13 +0100 In-Reply-To: <1348859054.2036.122.camel@shinybook.infradead.org> References: <1340959739.2936.28.camel@lappy> <1347057778.26695.68.camel@sbsiddha-desk.sc.intel.com> <1347062045.26695.82.camel@sbsiddha-desk.sc.intel.com> <1347202600.5876.7.camel@sbsiddha-ivb> <505068F4.4080309@gmail.com> <50506A6C.30109@gmail.com> <50656733.3040609@gmail.com> <1348859054.2036.122.camel@shinybook.infradead.org> Content-Type: multipart/signed; micalg="sha1"; protocol="application/x-pkcs7-signature"; boundary="=-ZUFMkltaGO7PLuvszoxk" Mime-Version: 1.0 Sender: owner-linux-mm@kvack.org List-ID: To: Linus Torvalds , Anatolij Gustschin , dhowells@redhat.com Cc: Sasha Levin , suresh.b.siddha@intel.com, Andrew Morton , "linux-kernel@vger.kernel.org" , linux-mtd@lists.infradead.org, linux-mm , Dave Jones --=-ZUFMkltaGO7PLuvszoxk Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2012-09-28 at 20:04 +0100, David Woodhouse wrote: > > I was really hoping it would go through the regular channels and come > > back to me that way, since I can't really test it, and it's bigger > > than the trivial obvious one-liners that I'm happy to commit. >=20 > I can't test it on real hardware here either, but I can pull it through > my tree.=20 Hmm... I don't have access to real hardware with mmapable flash right now (I haven't finished setting up the machine room since moving house last month). But you're seeing this in a case where you *don't* have mmapable flash either. If the value of map->phys is NO_XIP (-1UL), that should be taken to mean that you can't directly mmap it at all. That check seems to have been missing from David's commit 402d3265 in which he introduced the mtd_mmap() operation, and wasn't fixed in commit dd02b67d5 where Anatolij fixed things to actually *work* in the MMU code path. This should fix it: diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c index f2f482b..27c2f57 100644 --- a/drivers/mtd/mtdchar.c +++ b/drivers/mtd/mtdchar.c @@ -1137,8 +1137,10 @@ static int mtdchar_mmap(struct file *file, struct vm_area_struct *vma) u32 len; =20 if (mtd->type =3D=3D MTD_RAM || mtd->type =3D=3D MTD_ROM) { - off =3D vma->vm_pgoff << PAGE_SHIFT; start =3D map->phys; + if (map->phys =3D=3D NO_XIP) + return -EINVAL; + off =3D vma->vm_pgoff << PAGE_SHIFT; len =3D PAGE_ALIGN((start & ~PAGE_MASK) + map->size); start &=3D PAGE_MASK; if ((vma->vm_end - vma->vm_start + off) > len) Now, we should ideally *also* handle the case where there genuinely *is* a mappable ROM device at the very top of physical memory, and not suffer from overflow. But that's a more esoteric case, and the patch above seems to be the one that we want to get merged into -stable. --=20 dwmw2 --=-ZUFMkltaGO7PLuvszoxk Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIUbjCCBjQw ggQcoAMCAQICAR4wDQYJKoZIhvcNAQEFBQAwfTELMAkGA1UEBhMCSUwxFjAUBgNVBAoTDVN0YXJ0 Q29tIEx0ZC4xKzApBgNVBAsTIlNlY3VyZSBEaWdpdGFsIENlcnRpZmljYXRlIFNpZ25pbmcxKTAn BgNVBAMTIFN0YXJ0Q29tIENlcnRpZmljYXRpb24gQXV0aG9yaXR5MB4XDTA3MTAyNDIxMDE1NVoX DTE3MTAyNDIxMDE1NVowgYwxCzAJBgNVBAYTAklMMRYwFAYDVQQKEw1TdGFydENvbSBMdGQuMSsw KQYDVQQLEyJTZWN1cmUgRGlnaXRhbCBDZXJ0aWZpY2F0ZSBTaWduaW5nMTgwNgYDVQQDEy9TdGFy dENvbSBDbGFzcyAxIFByaW1hcnkgSW50ZXJtZWRpYXRlIENsaWVudCBDQTCCASIwDQYJKoZIhvcN AQEBBQADggEPADCCAQoCggEBAMcJg8zOLdgasSmkLhOrlr6KMoOMpohBllVHrdRvEg/q6r8jR+EK 75xCGhR8ToREoqe7zM9/UnC6TS2y9UKTpT1v7RSMzR0t6ndl0TWBuUr/UXBhPk+Kmy7bI4yW4urC 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