From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 27D09188A3B for ; Mon, 25 Nov 2024 13:19:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.50.34 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732540797; cv=none; b=pewYIvlFjpmgdLN9zTHzKrSsrQ0i8nfVAv5uOVB8cdQkw37Qy6Z04Gj0PZPVkcmBYt78oVD7+VWoTQ9WVFbPaQbMtmFIAID11MecJEwxMoAzFVpTRXM6Z1JE9BAkXzah3pLPUuwrRrIWsfBxUDQzRQZ3N+iK6b8pQjNq3bhAwOs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732540797; c=relaxed/simple; bh=usYJq9WYL+QwQJdsxE0xxVDEmAUIkoqO2CNPnHJO3sg=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=BfvtAfIKo74J7CmHtI4LzuED73Tm1vsMimbUqPBRlXWyNajoALJIuy5aDAi83SD/XGc36fUE9+LUi35Z8/mZgvKKWALTH0BO80o9DiwB32dPCoN4PDgBeuA50HDkEsnSdXtthktxNEkM4jexD9D7kwhAlEJxtGvniP6Xjo1MXO4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=casper.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=kg3CQ/1g; arc=none smtp.client-ip=90.155.50.34 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=casper.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="kg3CQ/1g" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=Uo6SdHX5t3CR9WQPsFXOrSWtNueNCLN9mds7t2K1uwo=; b=kg3CQ/1gN4zbxHsr5B00Z1T+j6 D1KC1Xa5vXV/hYnGo+hAp980hdpTaaaOGQfGs50nwgHzxx9E2fIIOyN6Dc3vgKFltBxGezzm46x8D RGE5fGy9cK7NzLJhQop4prAsjZCM5nN3RuKjK041kB67r8zMHEgxsO4jnr3QH/UYzDJnHu/isfdy0 YRnevCsiU15srY9p0aemP2rv3uW1FwbIMLw0tjWkcEiioqwz2L4SWYV8n2EniDFXWi+ityjH8QLS0 gDsXBarTvDjsfZNGxZmpMwB7Oy8WVvffJvNoO/60sOHtQKskLEo7xCkRxZDdBAQovBomOQK11dT8g 4ks823Lg==; Received: from [54.239.6.187] (helo=edge-m3-r1-122.e-iad51.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.98 #2 (Red Hat Linux)) id 1tFZ0A-0000000Bu85-0DrN; Mon, 25 Nov 2024 13:19:43 +0000 Message-ID: <7f75150e9d5d358c8fdc38b591f99a252071fba0.camel@infradead.org> Subject: Re: [EXTERNAL] [RFC PATCH v3 01/20] x86/kexec: Ensure control_code_page is mapped in kexec page tables From: David Woodhouse To: kexec@lists.infradead.org, =?ISO-8859-1?Q?Sch=F6nherr=2C?= "Jan H." Cc: Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , "Kirill A. Shutemov" , Kai Huang , Nikolay Borisov , linux-kernel@vger.kernel.org, Simon Horman , Dave Young , Peter Zijlstra , jpoimboe@kernel.org, bsz@amazon.de Date: Mon, 25 Nov 2024 13:19:41 +0000 In-Reply-To: <8b7cd35ab5fec39b80eda8d5907b641af14c3272.camel@infradead.org> References: <20241125100815.2512-1-dwmw2@infradead.org> <20241125100815.2512-2-dwmw2@infradead.org> <8b7cd35ab5fec39b80eda8d5907b641af14c3272.camel@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-krq2nNCAWzYLFYkInkxm" User-Agent: Evolution 3.52.3-0ubuntu1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html --=-krq2nNCAWzYLFYkInkxm Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2024-11-25 at 10:29 +0000, David Woodhouse wrote: > On Mon, 2024-11-25 at 09:54 +0000, David Woodhouse wrote: > > From: David Woodhouse > >=20 > > The control_code_page should be explicitly mapped into the identity > > mapped page tables for the relocate_kernel environment. This only seems > > to have worked by luck before, because it tended to be within the same > > 2MiB or 1GiB large page already mapped for another reason. > >=20 > > A subsequent commit will reduce the control_code_page to a single 4KiB > > page instead of a higher-order allocation, and seems to make it much > > *less* likely that we get lucky with its placement. This leads to a > > fault when relocate_kernel() first tries to access the page through its > > identity-mapped virtual address. >=20 > This one is confusing me. Jan points out that it shouldn't be needed, > because the control page should come from kernel memory and thus should > be mapped anyway because the loop immediately below my added code adds > *all* of the pfn_mapped[] ranges. I think we understand this one now; it's because of PTI. So where the identmap code in e.g. ident_p4d_init() calls set_pte(), set_pte() is actually trying to write *both* the kernel and userspace copies of the page table, which it expects to be in adjacent pages. But in this case it's just scribbling over the end of the single 4KiB page that was allocated for it. This should suffice to mask the problem (testing now) but obviously it isn't a great solution: --- a/arch/x86/kernel/machine_kexec_64.c +++ b/arch/x86/kernel/machine_kexec_64.c @@ -213,7 +213,7 @@ static void *alloc_pgt_page(void *data) struct page *page; void *p =3D NULL; =20 - page =3D kimage_alloc_control_pages(image, 0); + page =3D kimage_alloc_control_pages(image, 1); if (page) { p =3D page_address(page); clear_page(p); --=-krq2nNCAWzYLFYkInkxm Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEkQw ggYQMIID+KADAgECAhBNlCwQ1DvglAnFgS06KwZPMA0GCSqGSIb3DQEBDAUAMIGIMQswCQYDVQQG EwJVUzETMBEGA1UECBMKTmV3IEplcnNleTEUMBIGA1UEBxMLSmVyc2V5IENpdHkxHjAcBgNVBAoT FVRoZSBVU0VSVFJVU1QgTmV0d29yazEuMCwGA1UEAxMlVVNFUlRydXN0IFJTQSBDZXJ0aWZpY2F0 aW9uIEF1dGhvcml0eTAeFw0xODExMDIwMDAwMDBaFw0zMDEyMzEyMzU5NTlaMIGWMQswCQYDVQQG 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