From nobody Sun Dec 14 19:11:30 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 75CE1189F2F for ; Thu, 12 Dec 2024 20:11:33 +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=1734034295; cv=none; b=rflaBhp9w4llUazDteHzs6tEwgE7aLIiusoszIiImxYNpXVMXM/nsiO74hRnHFELoRi5xBycHVNuLqJk0vA4bE/Rf1cO/G2znvyddN4RyRj+peHZ9yV+l9Du6SqcxrhugTX5fmz6z5eH6qDgQTiSH6Sa2RI2a2njzy4REl3ta98= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734034295; c=relaxed/simple; bh=Ba04gFu4msT/YSXqu9jU1j8YkfgruHib20tL4/+JzME=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=ao0XQmqnT9AKD28XDUWGQO+V83fWiSPJC7T9wGIcqd5HzquULPS1KFbv6Kvj/VVJ3GAoSpzAQat9Ax6SOdlPdu8EFQwlxO0SYDhm0ZzeQowa4eo2/Qp158c5l255U572AQINDPVRGd9qTfIycL5hVdVxA5LYOeS5hMPveO+UKk0= 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=UqRlIQrn; 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="UqRlIQrn" 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=YporvndFODONTTFX9qQljMH3+Ve2ai2ZANazpKcC5+Y=; b=UqRlIQrnqmsi+P2RBICQW87lXk D23oECvLjXJFyMDW/ten8kp9/M8RPJBEYQjCTkLHgTPVONM9XVPK7s1pFdeKf3vyB/i0Ddu36t7pn jEeBTffzm7uoRJafh6RB4ATOznHPkKtBu4CGE8mTBzQ2c9dfnaBjjNTi3oJ/GwUK6KzIJR/PTzbC1 +6baO00FSTkwsOmLXZ2+qcJTi45lKH9XvStZOH6pCMLs69pXxUB4lwUZST+O2aWRnvtp+Zz7uJa8I eswX4Ur/okn7I9g7l0f7+MtQpasSTN8EYdUg1mSx3sDrRFRIX+r4Q6ie/fyAvpcdWkiYMNK0rRd3k 8ehTxoVg==; Received: from 54-240-197-230.amazon.com ([54.240.197.230] helo=freeip.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.98 #2 (Red Hat Linux)) id 1tLpWq-00000007s1o-3uA0; Thu, 12 Dec 2024 20:11:21 +0000 Message-ID: <9c68688625f409104b16164da30aa6d3eb494e5d.camel@infradead.org> Subject: [PATCH] x86/kexec: Only write through identity mapping of control page From: David Woodhouse To: Nathan Chancellor Cc: "Ning, Hongyu" , kexec@lists.infradead.org, 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: Thu, 12 Dec 2024 20:11:19 +0000 In-Reply-To: <20241212174243.GA2149156@ax162> References: <20241205153343.3275139-1-dwmw2@infradead.org> <20241205153343.3275139-14-dwmw2@infradead.org> <20241212014418.GA532802@ax162> <10a4058d9a667ca7aef7e1862375c2da84ef53a3.camel@infradead.org> <20241212150408.GA542727@ax162> <38aaf87162d10c79b3d3ecae38df99e89ad16fce.camel@infradead.org> <20241212174243.GA2149156@ax162> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-DqCM0FusEkCu9oakxhCj" 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 --=-DqCM0FusEkCu9oakxhCj Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" From: David Woodhouse The virtual mapping of the control page may have been _PAGE_GLOBAL and thus its PTE might not have been flushed on the %cr3 switch and it might effectively still be read-only. Move the writes to it down into the identity_mapped() function where the same %rip-relative addressing will get the new mapping. The stack is fine, as that's using the identity mapped address anyway. Fixes: 5a82223e0743 ("x86/kexec: Mark relocate_kernel page as ROX instead o= f RWX") Reported-by: Nathan Chancellor Reported-by: "Ning, Hongyu" Closes: https://bugzilla.kernel.org/show_bug.cgi?id=3D219592 Signed-off-by: David Woodhouse Tested-by: Nathan Chancellor --- arch/x86/kernel/relocate_kernel_64.S | 32 +++++++++++++++++----------- 1 file changed, 20 insertions(+), 12 deletions(-) diff --git a/arch/x86/kernel/relocate_kernel_64.S b/arch/x86/kernel/relocat= e_kernel_64.S index 553d67845b84..b9c80b3091c8 100644 --- a/arch/x86/kernel/relocate_kernel_64.S +++ b/arch/x86/kernel/relocate_kernel_64.S @@ -90,22 +90,17 @@ SYM_CODE_START_NOALIGN(relocate_kernel) movq kexec_pa_table_page(%rip), %r9 movq %r9, %cr3 =20 - /* Save %rsp and CRs. */ - movq %rsp, saved_rsp(%rip) - movq %rax, saved_cr3(%rip) - movq %cr0, %rax - movq %rax, saved_cr0(%rip) - /* Leave CR4 in %r13 to enable the right paging mode later. */ - movq %cr4, %r13 - movq %r13, saved_cr4(%rip) - - /* save indirection list for jumping back */ - movq %rdi, pa_backup_pages_map(%rip) + /* + * The control page still might not be writable because the original + * kernel PTE may have had the _PAGE_GLOBAL bit set. Don't write to + * it except through the *identmap* address. + */ =20 /* Save the preserve_context to %r11 as swap_pages clobbers %rcx. */ movq %rcx, %r11 =20 /* setup a new stack at the end of the physical control page */ + movq %rsp, %rbp lea PAGE_SIZE(%rsi), %rsp =20 /* jump to identity mapped page */ @@ -118,6 +113,19 @@ SYM_CODE_END(relocate_kernel) =20 SYM_CODE_START_LOCAL_NOALIGN(identity_mapped) UNWIND_HINT_END_OF_STACK + + /* Save original %rsp and CRs. */ + movq %rbp, saved_rsp(%rip) + movq %rax, saved_cr3(%rip) + movq %cr0, %rax + movq %rax, saved_cr0(%rip) + /* Leave CR4 in %r13 to enable the right paging mode later. */ + movq %cr4, %r13 + movq %r13, saved_cr4(%rip) + + /* save indirection list for jumping back */ + movq %rdi, pa_backup_pages_map(%rip) + /* * %rdi indirection page * %rdx start address @@ -185,7 +193,7 @@ SYM_CODE_START_LOCAL_NOALIGN(identity_mapped) * - Machine check exception on TDX guest, if it was enabled before. * Clearing MCE might not be allowed in TDX guests, depending on setup. * - * Use R13 that contains the original CR4 value, read in relocate_kernel(= ). + * Use R13 that contains the original CR4 value * PAE is always set in the original CR4. */ andl $(X86_CR4_PAE | X86_CR4_LA57), %r13d --=20 2.47.0 --=-DqCM0FusEkCu9oakxhCj Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEkQw ggYQMIID+KADAgECAhBNlCwQ1DvglAnFgS06KwZPMA0GCSqGSIb3DQEBDAUAMIGIMQswCQYDVQQG EwJVUzETMBEGA1UECBMKTmV3IEplcnNleTEUMBIGA1UEBxMLSmVyc2V5IENpdHkxHjAcBgNVBAoT FVRoZSBVU0VSVFJVU1QgTmV0d29yazEuMCwGA1UEAxMlVVNFUlRydXN0IFJTQSBDZXJ0aWZpY2F0 aW9uIEF1dGhvcml0eTAeFw0xODExMDIwMDAwMDBaFw0zMDEyMzEyMzU5NTlaMIGWMQswCQYDVQQG EwJHQjEbMBkGA1UECBMSR3JlYXRlciBNYW5jaGVzdGVyMRAwDgYDVQQHEwdTYWxmb3JkMRgwFgYD VQQKEw9TZWN0aWdvIExpbWl0ZWQxPjA8BgNVBAMTNVNlY3RpZ28gUlNBIENsaWVudCBBdXRoZW50 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