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 32A7911185 for ; Tue, 26 Nov 2024 11:42:37 +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=1732621360; cv=none; b=opL3qTVO3SKiHzdpogTwITvmvnt+6Kz/vB39SJ0Xh0wigHXyihV7FyTXTzAH7JTOEwGIoE9CTzZdoS0UcYabZUCa20AyPk2UnpWp26Gk9dAESneOoRjCsa20ue8zixwN6XoLGjtFcs4ZO5SmS6lSnJwLw9yZFKM/lEVFWFJbQss= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732621360; c=relaxed/simple; bh=pCr2pcpYJHcMD4VYLnjqYnwpmCgSHYuXJWtbRX/jsbo=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=Z7mqK28O+syW/T8B+rP7lXWd3JYAAT/QdiA8dnpdETPSSu1bvwLAOpSTnczvO8DfdnUbA9vhVg4vNTxUPCfKPVoZF54c2c9OMWO5W38luLYZ8IaImBdne9eEhLVs2XJiF2MSDZ1kK+Q+dtpkXBRI1OOwX92Q2qoIX7uZ8rsdohU= 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=CodgF47n; 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="CodgF47n" 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=yjeFVKERWJQzwdppjkeqNBjddql6+Bu2astJ26YJ0IM=; b=CodgF47nWvRXPDhUK+qLeXzib2 xRlL+3zN75x4x3CUtwVNFWGwN9QHsrggAEe5nZvK2nsWomhooiu9vZP8eN+yR6zjDQajQE1oZRKBN btzggfWj6MlH3np2/N4037xn0Z3kQvRPlRy9P8+popOiWBTybLeMLnYsF9yUEeLsRAP8CVeO4wnGl Z0RjsTn6rcGRdzBWggioocWa6ndGxKeSBurj2smmiNR6mTf7GRqgeVhc1FFaGpmJ8lsnD68/CZ4ay lRcOzpueyn+0bZrLdcb8Q/iGQ7T5UkAHX1VUcnVf4tc+APtGNtTxqCH8HhQVZMXlx5RiPFvEbhOhP 7J7nP3qA==; Received: from [54.240.197.232] (helo=edge-m3-r2-119.e-iad51.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.98 #2 (Red Hat Linux)) id 1tFtxF-0000000DU7E-29QY; Tue, 26 Nov 2024 11:42:08 +0000 Message-ID: <0c8fe87b34252966ecf558271b09c4b855700691.camel@infradead.org> Subject: Re: [RFC PATCH] x86/mm: Disable PTI for kernel_ident_mapping_init() From: David Woodhouse To: Dave Hansen , kexec@lists.infradead.org, =?ISO-8859-1?Q?Sch=F6nherr=2C?= "Jan H." , Rik van Riel 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: Tue, 26 Nov 2024 11:42:04 +0000 In-Reply-To: <5633d50d-0d61-4d18-b43f-11311b5ec920@intel.com> References: <20241125100815.2512-1-dwmw2@infradead.org> <20241125100815.2512-2-dwmw2@infradead.org> <8b7cd35ab5fec39b80eda8d5907b641af14c3272.camel@infradead.org> <7f75150e9d5d358c8fdc38b591f99a252071fba0.camel@infradead.org> <7e7cb9b21f17b345d8539962093d0c030cca3e34.camel@infradead.org> <88a87314-45ad-47f7-a93a-a9a53d7e8745@intel.com> <5d385e4c06ebd218cfdc20ef4f208ee4abcfa252.camel@infradead.org> <5633d50d-0d61-4d18-b43f-11311b5ec920@intel.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-+xIOdCyKVRl+in78pFHA" 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 --=-+xIOdCyKVRl+in78pFHA Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2024-11-25 at 11:13 -0800, Dave Hansen wrote: > On 11/25/24 10:53, David Woodhouse wrote: > > > I think we have a lot of software-available space in the page table > > > pointer entries. What would folks think if we set a special bit in th= ose > > > p4d entries that said: > > >=20 > > > "I don't need to be propagated to > > > the user portion of the page tables." > > >=20 > > > It would obviously get set in this code that you're trying to fix. It > > > might _also_ be able to be set in in "_USR", like here: > > >=20 > > > #define _KERNPG_TABLE_NOENC=C2=A0 (__PP|__RW|=C2=A0=C2=A0 0|___A|=C2= =A0=C2=A0 0|___D|=C2=A0=C2=A0 0|=C2=A0=C2=A0 0) > > > #define _PAGE_TABLE_NOENC=C2=A0=C2=A0=C2=A0 (__PP|__RW|_USR|___A|=C2= =A0=C2=A0 0|___D|=C2=A0=C2=A0 0|=C2=A0=C2=A0 0) > > >=20 > > > like: > > >=20 > > > #define _USR _PAGE_USER|_PAGE_SW_WHATEVER > > In fact, do we even need a separate bit? Any PTE without the _PAGE_USER > > bit set clearly doesn't need to be mirrored into the user page > > tables...? >=20 > I can't think of any exceptions where this would break off the top of my > head. It seems too simple to work. ;) On IRC we discussed the fact that it's slightly non-trivial to use that as the trigger for pgd_clear(). I threw this version together and it didn't immediately explode... Signed-off-by: David Woodhouse diff --git a/arch/x86/include/asm/pgtable_types.h b/arch/x86/include/asm/pg= table_types.h index 6f82e75b6149..4b804531b03c 100644 --- a/arch/x86/include/asm/pgtable_types.h +++ b/arch/x86/include/asm/pgtable_types.h @@ -36,10 +36,12 @@ #define _PAGE_BIT_DEVMAP _PAGE_BIT_SOFTW4 =20 #ifdef CONFIG_X86_64 -#define _PAGE_BIT_SAVED_DIRTY _PAGE_BIT_SOFTW5 /* Saved Dirty bit */ +#define _PAGE_BIT_SAVED_DIRTY _PAGE_BIT_SOFTW5 /* Saved Dirty bit (leaf) *= / +#define _PAGE_BIT_NOPTISHADOW _PAGE_BIT_SOFTW5 /* No PTI shadow (root PGD)= */ #else /* Shared with _PAGE_BIT_UFFD_WP which is not supported on 32 bit */ -#define _PAGE_BIT_SAVED_DIRTY _PAGE_BIT_SOFTW2 /* Saved Dirty bit */ +#define _PAGE_BIT_SAVED_DIRTY _PAGE_BIT_SOFTW2 /* Saved Dirty bit (leaf) *= / +#define _PAGE_BIT_NOPTISHADOW _PAGE_BIT_SOFTW2 /* No PTI shadow (root PGD)= */ #endif =20 /* If _PAGE_BIT_PRESENT is clear, we use these: */ @@ -139,6 +141,8 @@ =20 #define _PAGE_PROTNONE (_AT(pteval_t, 1) << _PAGE_BIT_PROTNONE) =20 +#define _PAGE_NOPTISHADOW (_AT(pteval_t, 1) << _PAGE_BIT_NOPTISHADOW) + /* * Set of bits not changed in pte_modify. The pte's * protection key is treated like _PAGE_RW, for diff --git a/arch/x86/mm/ident_map.c b/arch/x86/mm/ident_map.c index 437e96fb4977..5ab7bd2f1983 100644 --- a/arch/x86/mm/ident_map.c +++ b/arch/x86/mm/ident_map.c @@ -174,7 +174,7 @@ static int ident_p4d_init(struct x86_mapping_info *info= , p4d_t *p4d_page, if (result) return result; =20 - set_p4d(p4d, __p4d(__pa(pud) | info->kernpg_flag)); + set_p4d(p4d, __p4d(__pa(pud) | info->kernpg_flag | _PAGE_NOPTISHADOW)); } =20 return 0; @@ -218,14 +218,14 @@ int kernel_ident_mapping_init(struct x86_mapping_info= *info, pgd_t *pgd_page, if (result) return result; if (pgtable_l5_enabled()) { - set_pgd(pgd, __pgd(__pa(p4d) | info->kernpg_flag)); + set_pgd(pgd, __pgd(__pa(p4d) | info->kernpg_flag | _PAGE_NOPTISHADOW)); } else { /* * With p4d folded, pgd is equal to p4d. * The pgd entry has to point to the pud page table in this case. */ pud_t *pud =3D pud_offset(p4d, 0); - set_pgd(pgd, __pgd(__pa(pud) | info->kernpg_flag)); + set_pgd(pgd, __pgd(__pa(pud) | info->kernpg_flag | _PAGE_NOPTISHADOW)); } } =20 diff --git a/arch/x86/mm/pti.c b/arch/x86/mm/pti.c index 851ec8f1363a..5f0d579932c6 100644 --- a/arch/x86/mm/pti.c +++ b/arch/x86/mm/pti.c @@ -132,7 +132,7 @@ pgd_t __pti_set_user_pgtbl(pgd_t *pgdp, pgd_t pgd) * Top-level entries added to init_mm's usermode pgd after boot * will not be automatically propagated to other mms. */ - if (!pgdp_maps_userspace(pgdp)) + if (!pgdp_maps_userspace(pgdp) || (pgd.pgd & _PAGE_NOPTISHADOW)) return pgd; =20 /* --=-+xIOdCyKVRl+in78pFHA Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEkQw ggYQMIID+KADAgECAhBNlCwQ1DvglAnFgS06KwZPMA0GCSqGSIb3DQEBDAUAMIGIMQswCQYDVQQG EwJVUzETMBEGA1UECBMKTmV3IEplcnNleTEUMBIGA1UEBxMLSmVyc2V5IENpdHkxHjAcBgNVBAoT FVRoZSBVU0VSVFJVU1QgTmV0d29yazEuMCwGA1UEAxMlVVNFUlRydXN0IFJTQSBDZXJ0aWZpY2F0 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