From nobody Thu Dec 18 20:15:59 2025 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 D9D75746E; Wed, 4 Dec 2024 11:27:43 +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=1733311666; cv=none; b=hxEmzgl0pgwI2loxZx9pva6adY9FkSD3sJskMfs5j3jreoIyGiS9P5U3KPK1+v0eWGNvcAq3CuquWArg3rEqQs0UKaMgsabUMZhdca3sXCrDTCKLvvOPzI8VxKAsEMrWJVIIheq2afsdo9G6+ZMUoeOyRKWzGx5hXlvaENURYgE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733311666; c=relaxed/simple; bh=dVH+tgjpyQrFLY77IeV4Cw5NIeEiUhIKoYWmR7yWLvg=; h=Message-ID:Subject:From:To:Cc:Date:Content-Type:MIME-Version; b=Lnv1t6PzlKIX53BT60DZrhts8thvrz92OxKFc2DF+S5HQG93/9qOzNfCJTYRXOKPEu3ljFGqkZnMC7kr7Hb6LM8tG6FyFHfe52G6dlh+gOiRf0w9wWlju1DBRzAiQvxJ7uoj4/Mk0r/5chBmam3BPGYkbhDwOzleGrU+BDQ0d+o= 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=uUoB6lLf; 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="uUoB6lLf" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:Date:Cc:To: From:Subject:Message-ID:Sender:Reply-To:Content-Transfer-Encoding:Content-ID: Content-Description:In-Reply-To:References; bh=KJ2Q4ZqhCNkrSiVW15tDffYs6TsIHHguf5lnK/PIUzU=; b=uUoB6lLfAdKU5wNmwfpKENuB6O dNQWaUBJJWMfX5MAgjjVdVFT4+VuY2siWpTfVIH+tY30XINVPFjuvihxvIv1v0fcS34DDpD26hFD+ 709HbPUoIFN7BOYDfqLJXufIVYVjKpPkmmvIl5WW7sJHrPtlcoaHUHuu6JFJgMaKI4KYDhKPBztIY dLVr220F/k0WlgkOQ3tuL3nsncsxGkOliMG0LaeFo9rxCjU/EZYwMdqjlmuQQcimv1r/9JbRPa7rs 6Bms02+tbZ6nNuDfAYbCJpNyByxZdGM9OmwMqehFnUoMWEV8sRexcZfQGZkc9pBXSoq9FapBWDyoZ DNAJQbRA==; Received: from 54-240-197-238.amazon.com ([54.240.197.238] helo=edge-m1-r1-104.e-iad16.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.98 #2 (Red Hat Linux)) id 1tInXG-0000000BHeU-1t95; Wed, 04 Dec 2024 11:27:16 +0000 Message-ID: <412c90a4df7aef077141d9f68d19cbe5602d6c6d.camel@infradead.org> Subject: [PATCH] x86/mm: Add _PAGE_NOPTISHADOW bit to avoid updating userspace page tables From: David Woodhouse To: Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Andy Lutomirski , Peter Zijlstra , "Kirill A. Shutemov" , Rick Edgecombe , David Woodhouse , Tom Lendacky , Yue Haibing , Juergen Gross , linux-kernel@vger.kernel.org Cc: kexec , linux-mm@vger.kernel.org, stable Date: Wed, 04 Dec 2024 11:27:14 +0000 Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-quzhiDMlavBYSPCmnHEr" 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 --=-quzhiDMlavBYSPCmnHEr Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" From: David Woodhouse 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 page tables, which are actually 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 has 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 Suggested-by: Dave Hansen Signed-off-by: David Woodhouse --- Split out from the kexec-debug series at=20 https://lore.kernel.org/kexec/c16ed8f5c960c34f05b88b84a31f28a610f6a3cf.came= l@infradead.org/T/ because it looks like it's an actual bug fix for the hibernate and acpi_mp cases. It only bites kexec after I take away the extra 4KiB that we were letting it safely scribble on purely by chance. Added Cc:stable for discussion but the simpler fix there might just be to allocate a full 8KiB for the PGD for the affected use cases? 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 2.47.0 --=-quzhiDMlavBYSPCmnHEr 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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