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 1F0D417991 for ; Sun, 15 Dec 2024 10:10:11 +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=1734257414; cv=none; b=VwNswfOWZYF29f81QVkwYan52sRyvXQCH8nKNjZvvCp2/3TDjOnjHIUz16VDUAQrqLWhom/mVUb7ShxTowXMmsQOPAYF5cNbdNmfZyxc0gSJ4zxeNG6W0LW1qjhBBPNBVsjZEYck/ChbFLsceRhbycNcnroYFrXBilD7fe6rtk0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734257414; c=relaxed/simple; bh=fz9BNa+5ROa0xzJeYdetsOf/XMhNNrbQru4rKXCwQ5U=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=ajIdO0JLCMKJjiHoMaExCxcThN/N0QD4Sk7IBzn8T+EdPEsIoT192yHyj2z3kzETpj25sjIdrsCmJubtxVvljffAQ3iPAOYZ4thq2TSmvbSmheZVZXws1vyhLyJu75dZW3bej68hpSBTBrhHKjbABiuoR0N0GnvFVfjO75OKzyk= 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=O/PvvBB+; 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="O/PvvBB+" 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=g4qR+snC6HtZgH55at3AFXAwWfRBbeTKNcqFpr3lL7o=; b=O/PvvBB+QSLCmq7urEBrUmdPPu EAO/mEODFFALt5aRR4oG8Ayl0/UVeQ+vXXpIzqBGwBN8BCGa2Dj6TG9U1wx3CU/ubsrmKTvladxLw PF9eV5+4bVztmxlaBN5SCfx52RgKV3AleK1fLnjPj/QnKNLBQHLWJZAzqbtRpMA5eXTtRIACeNHwY e3pESAaL7irQrFCj2SiVq5uacbGdJzXiUfTT0khpgXu6pYw8tP4pSRrMKGABmZgVJg16RdP2sbV/T Yuw9AqOhEkl69rgzs2moC5cpXLIiZHl0QGjfM/CU52NsvMOwQS47UFAmw1DvMWVYB4zWKbKFhbSFU MI5ySxrA==; Received: from [54.239.6.187] (helo=u09cd745991455d.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.98 #2 (Red Hat Linux)) id 1tMlZW-00000008eVf-2qZ3; Sun, 15 Dec 2024 10:09:59 +0000 Message-ID: <24d843d2ceb09acdae494ee9a17ec94bf8bb4e4f.camel@infradead.org> Subject: Re: [PATCH v5 07/20] x86/kexec: Invoke copy of relocate_kernel() instead of the original From: David Woodhouse To: Nathan Chancellor Cc: 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: Sun, 15 Dec 2024 10:09:57 +0000 In-Reply-To: <20241214230818.GA677337@ax162> References: <20241205153343.3275139-1-dwmw2@infradead.org> <20241205153343.3275139-8-dwmw2@infradead.org> <20241214230818.GA677337@ax162> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-S+evPgq2z/6BpNaFnBAi" 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 --=-S+evPgq2z/6BpNaFnBAi Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Sat, 2024-12-14 at 16:08 -0700, Nathan Chancellor wrote: >=20 > I guess this seems somewhat unavoidable because control_page is just a > 'void *', perhaps machine_kexec() should just be marked as __nocfi? This > diff resolves that issue for me. The patch below seems to work too. I already wanted to deal with the case where relocate_kernel isn't at the start of the page, so it forces me to do that. For some reason it also started complaining vmlinux.o: warning: objtool: relocate_kernel+0x6a: return with modified sta= ck frame ... which is easy to fix just by turning it into a jmp *%rsi; I have no idea why it was done with a ret like that in the first place. I don't know why it puts 16 bytes of NOPs between __reloc_start and __cfi_relocate_kernel (in addition to the 16 before relocate_kernel itself), and space is *fairly* tight in the control page, but it's tolerable. To make the CFI check actually give useful output if it triggers, I'm tempted to do the IDT/GDT invalidation relocate_kernel itself, instead of before the call. diff --git a/arch/x86/kernel/relocate_kernel_64.S b/arch/x86/kernel/relocat= e_kernel_64.S index ccb297765e08..e6befd11fee4 100644 --- a/arch/x86/kernel/relocate_kernel_64.S +++ b/arch/x86/kernel/relocate_kernel_64.S @@ -6,6 +6,7 @@ =20 #include #include +#include #include #include #include @@ -61,7 +62,10 @@ SYM_DATA_END(kexec_debug_idt) =20 .section .text.relocate_kernel,"ax"; .code64 -SYM_CODE_START_NOALIGN(relocate_kernel) +__reloc_start: + ANNOTATE_NOENDBR + +SYM_TYPED_FUNC_START(relocate_kernel) UNWIND_HINT_END_OF_STACK ANNOTATE_NOENDBR /* @@ -115,10 +119,9 @@ SYM_CODE_START_NOALIGN(relocate_kernel) lea PAGE_SIZE(%rsi), %rsp =20 /* jump to identity mapped page */ - addq $(identity_mapped - relocate_kernel), %rsi - pushq %rsi - ANNOTATE_UNRET_SAFE - ret + addq $(identity_mapped - __reloc_start), %rsi + 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