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 1A8451D63EA for ; Tue, 26 Nov 2024 16:10:19 +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=1732637422; cv=none; b=E+zzFguJaImCjC3uaNco4l+iD0HhoEeKjku06r7RNSEDe+FvPyqLNz2AcmDm+0gXW3tYk5aRnAcaGLi3Dw9Gl+mBG5NS8kh2+Ji1QEg1JdHAG0Hfd//6krPtTJluKwr777YCVhIQAu259OGT8uq3ypZMZ3lZcNmneSLSivZW7zI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732637422; c=relaxed/simple; bh=nAh+M/uNwc+WuKuIJLK/roeDws8Wp50Agis03iiM5LY=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=a3FklDiwLJmMvRFIYpvDWv/G6vJHLhywhu9TXHO2hvUbfTgjv28AnTVwYd0FbneVKOCB8EHjZ5f1mtWbgJR6b0HTQ3AmrgrP75sG6ZpDGQAIJhPj5TVGJBPJu+8AlBJTbUGgfr1i7MqQACW4rsuEMbwg8Qz1hSEIMjaCpPdoa18= 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=fYXZvRqC; 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="fYXZvRqC" 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=x+9pl3qoUUZrRucDsFvxJlCYP1qMRDE9nkMGrWK+aTs=; b=fYXZvRqCxlfIcgDifqVYFJ5MX+ cr3WGlEognCZFVVCO+03FGkT+aCTJ12+WW2lkapdVpZ32FdFwH5AZSmRHFsHdjwam+BMOgJ0soQht Jslqjd4UBmYK/UtIIfArWz1lGzBwHOQLgLfMruSjb6mlg5oN5c+yDOJU4UYepT17ddC8zJzZLNjGh 0KntY3dp7Mh6DOxPWM0aQsfOCOJity/nVYCCouph/mCU02Maa/VvTBON5YXSkKqPHmC8UuBz5EN/s MdbKeDeEmjtjDKHZfbqy/CcgFPhxVXLE42cb6oZoQ6YJutS62T330slztyD29xiBGrEseM0ER7a7G 6f/xketQ==; Received: from 54-240-197-236.amazon.com ([54.240.197.236] helo=edge-m3-r3-142.e-iad51.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.98 #2 (Red Hat Linux)) id 1tFy8T-000000009oc-4Aai; Tue, 26 Nov 2024 16:09:59 +0000 Message-ID: <87c2a595a79b1421a36a5db6ae43960bf6cece64.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 16:09:58 +0000 In-Reply-To: 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> <0c8fe87b34252966ecf558271b09c4b855700691.camel@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-TDpox0sMRi2pMNLfz1mh" 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 --=-TDpox0sMRi2pMNLfz1mh Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2024-11-26 at 07:49 -0800, Dave Hansen wrote: > On 11/26/24 03:42, David Woodhouse wrote: > > I threw this version together and it didn't immediately explode... >=20 > It's better than playing #define games. The damage is also pretty > limited and it helps us avoid plumbing a bit through the page table > handling function arguments. Thanks. I guess I should write it a commit message then... and add Cc:stable since AFAICT the other users of this *are* already broken. =46rom b474ea925a2ea566061552d8a6ca9e4a2945f45d Mon Sep 17 00:00:00 2001 From: David Woodhouse Date: Tue, 26 Nov 2024 15:55:13 +0000 Subject: [PATCH 05/20] x86/mm: Add _PAGE_NOPTISHADOW bit to avoid updating userspace page tables The set_p4d() and set_pgd() functions (in 4-level or 5-level page table set= ups respectively) assume that the root page table is actually a 8KiB allocation= , with the userspace root immediately after the kernel root page table (so th= at the former can enforce NX on on all the subordinate pages, which are actual= ly shared). However, users of the kernel_ident_mapping_init() code do not give it an 8K= iB allocation for its PGD. Both swsusp_arch_resume() and acpi_mp_setup_reset() allocate only a single 4KiB page. The kexec code on x86_64 currently gets away with it purely by chance, because it allocates 8KiB for its "control code page" and then actually uses the first half for the PGD, then copies t= he actual trampoline code into the second half only after the identmap code ha= s finished scribbling over it. Fix this by defining a _PAGE_NOPTISHADOW bit (which can use the same bit as _PAGE_SAVED_DIRTY since one is only for the PGD/P4D root and the other is exclusively for leaf PTEs.). This instructs __pti_set_user_pgtbl() not to write to the userspace 'shadow' PGD. Strictly, the _PAGE_NOPTISHADOW bit doesn't need to be written out to the actual page tables; since __pti_set_user_pgtbl() returns the value to be written to the kernel page table, it could be filtered out. But there seems to be no benefit to actually doing so. Cc: stable@kernel.org Signed-off-by: David Woodhouse --- arch/x86/include/asm/pgtable_types.h | 8 ++++++-- arch/x86/mm/ident_map.c | 6 +++--- arch/x86/mm/pti.c | 2 +- 3 files changed, 10 insertions(+), 6 deletions(-) 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 /* --=20 2.43.0 --=-TDpox0sMRi2pMNLfz1mh Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEkQw ggYQMIID+KADAgECAhBNlCwQ1DvglAnFgS06KwZPMA0GCSqGSIb3DQEBDAUAMIGIMQswCQYDVQQG EwJVUzETMBEGA1UECBMKTmV3IEplcnNleTEUMBIGA1UEBxMLSmVyc2V5IENpdHkxHjAcBgNVBAoT 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