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 627DF1993A3 for ; Wed, 18 Dec 2024 22:27:43 +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=1734560865; cv=none; b=MFMuhTTd/cCT69v7DhMGYg1aHtBM8QQWZne5XYsQOrkkwzkNE1oeBrMyD6ww2GdC/zt8SraZaVsq6bekaUoqWLwIDfht2neVZ1uttofPBPv2eAW1CtUkchdSrFSYyo+NXosY9oMyBz8siWNsk5BedEVa+kyUDwqDV1iEGwOugrU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734560865; c=relaxed/simple; bh=yFBLcl9AbJy9H6LNgUCJQWn/7MXoeHujsvDqFUZRH+c=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=Gsv3VeX0zd6VjLkUb1zKJjgVfX/jPKnBkvykr8gZB3brTbKuizjlirEKB+Yqf1tiyf0iWxfBjxcx9bYtl7LcP5tnSbteVYR3XlmFaB16Yr3OxFUujFU5IGuw8/STTBVH19BI9FkeqY+EPuHvddX9bDVfZ4B+YYOu11yO4FV2Q2o= 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=EY46l+Ae; 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="EY46l+Ae" 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=yFBLcl9AbJy9H6LNgUCJQWn/7MXoeHujsvDqFUZRH+c=; b=EY46l+AeCtLm1uU1o30P3PVy5n CAAqByr37NDfKYsWd+XIQIqdkgEMoyTLWEOjsPDnSc8OoURnmxsqylBpfkgu/j+kDGwrQ+GS6F1v2 +/eqG6ofA2K+lvgKL/tSqeM2q5IIoyy0+HS87YQFVlvIdQVQJgquO10Q6FDhiGg9adrHE8jDAMjY5 2tp7CDr/4TU+PmjeGD9SlYkiqXGqYmu2XJ3akXWRDyTlC8PKImrjUiQZdAXtNfDsi4aHx0EOEOCK8 e7SjQc7VbA9Pn3ltRL7b8Vq1LWS9ybe+CiJI3+hfvVp4015hHb9MW3PTmmZobjd1DuQ6Wyk7BQBt6 NWjbJ/kw==; Received: from [54.239.6.189] (helo=u09cd745991455d.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.98 #2 (Red Hat Linux)) id 1tO2Vs-00000000kMz-2MYO; Wed, 18 Dec 2024 22:27:29 +0000 Message-ID: Subject: Re: [PATCH v5 07/20] x86/kexec: Invoke copy of relocate_kernel() instead of the original From: David Woodhouse To: Josh Poimboeuf Cc: Nathan Chancellor , 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 , bsz@amazon.de Date: Wed, 18 Dec 2024 23:27:27 +0100 In-Reply-To: <20241218212326.44qff3i5n6cxuu5d@jpoimboe> References: <20241205153343.3275139-1-dwmw2@infradead.org> <20241205153343.3275139-8-dwmw2@infradead.org> <20241214230818.GA677337@ax162> <24d843d2ceb09acdae494ee9a17ec94bf8bb4e4f.camel@infradead.org> <20241216054942.GA25019@ax162> <79ea9c10ae4f1dae16be8c05bb7b7e6b72512f10.camel@infradead.org> <9ee61d2b89b4cecd10ece64002bf2c06648e1de7.camel@infradead.org> <20241218090305.y4o62pmdwq32732h@jpoimboe> <5857ef047402c3ded29d4c024f8fdc32608f1696.camel@infradead.org> <20241218212326.44qff3i5n6cxuu5d@jpoimboe> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-xX62rY2XLKYG8s/OMfYU" 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 --=-xX62rY2XLKYG8s/OMfYU Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2024-12-18 at 13:23 -0800, Josh Poimboeuf wrote: >=20 > The linker script does place it in .data, but objtool runs on the object > file before linking, where it's still in an executable section > (.text..relocate_kernel). >=20 > How about something like below? >=20 > =C2=A0 - move text to .data..relocate_kernel > =C2=A0 - remove objtool annotations > =C2=A0 - replace the alternative with a runtime check That leaves me unable to use 'objdump -S arch/x86/kernel/relocate_kernel_64.o' so I hate it :) At the moment objtool is *mostly* happy with the code in here; is there no way to make it happy even with the CFI annotation? In practice I probably don't even need to use SYM_TYPED_FUNC_START() anyway, as it's doing the wrong thing. It's pointless if it just uses the external __cfi_typeid_relocate_kernel symbol that the C code emits, because that's obviously going to match the prototype that the C code expects. So I might emit the __cfi_relocate_kernel prologue entirely manually, and then maybe objtool will thinking it's entitled to opinions :) --=-xX62rY2XLKYG8s/OMfYU 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 aWNhdGlvbiBhbmQgU2VjdXJlIEVtYWlsIENBMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKC 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