From nobody Sat Nov 30 10:54:53 2024 Received: from smtp-out2.suse.de (smtp-out2.suse.de [195.135.223.131]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 72E68192D8E for ; Tue, 10 Sep 2024 10:39:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=195.135.223.131 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725964785; cv=none; b=kGiII8f1XhSCVuIV/M+4JrGhKv1vm2uTkwoYG2+hPdXIpyanS/w509xfG2cazaPhIXbVCdoLXttDICTspviwUvHB1J3Z3ckviIyUQ2nguiEkSpheloDZCFbFKBZuxrQXa94m8TQn61G4q/SgwkC08TEMotjuOoimBZHuB3ztPRs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725964785; c=relaxed/simple; bh=95alIqRf+KhfIFvRr8uxg8eQjalDg4iRR39iZ6MXPd4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=NxD74EdyEU9yD3fxRoWt2Jcqed0KOCkrQqUnqOSsX7mcLF9D0qlBGdFvSZakbu82RiDjF0M/oD/A1uQnPOZ3fctJFdhPR3rJm8/baHpdLOUP4Hr93Z7D3ieAKrnKAekkVfuj23M5kuCzKIybXNlpFXwVHe+WNta6+B275GrnJkU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=suse.com; spf=pass smtp.mailfrom=suse.com; dkim=pass (1024-bit key) header.d=suse.com header.i=@suse.com header.b=SvGXu/OM; dkim=pass (1024-bit key) header.d=suse.com header.i=@suse.com header.b=SvGXu/OM; arc=none smtp.client-ip=195.135.223.131 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=suse.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=suse.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=suse.com header.i=@suse.com header.b="SvGXu/OM"; dkim=pass (1024-bit key) header.d=suse.com header.i=@suse.com header.b="SvGXu/OM" Received: from imap1.dmz-prg2.suse.org (unknown [10.150.64.97]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by smtp-out2.suse.de (Postfix) with ESMTPS id 46E5E1F80F; Tue, 10 Sep 2024 10:39:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1725964781; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=sbWgNcdAbQ/JNYr7pX5nA+rDDFiU+j1zOmO/QUARGmM=; b=SvGXu/OMEvYy1Vw1/3uWmlV8GV6SXNf1SRcEu+k4qs03+tfTLj31Pxskpdrn/fXe8CfvnE DT+RPFQVa+VLgYFeOU4AIE5/GeBka3uqHRUA3B+fxFeb92xnA0fgJ2ZVBD++KlF0qUBUtJ F0/oboyRupOAPfCz9JIc5vhSkedpMTI= Authentication-Results: smtp-out2.suse.de; none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1725964781; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=sbWgNcdAbQ/JNYr7pX5nA+rDDFiU+j1zOmO/QUARGmM=; b=SvGXu/OMEvYy1Vw1/3uWmlV8GV6SXNf1SRcEu+k4qs03+tfTLj31Pxskpdrn/fXe8CfvnE DT+RPFQVa+VLgYFeOU4AIE5/GeBka3uqHRUA3B+fxFeb92xnA0fgJ2ZVBD++KlF0qUBUtJ F0/oboyRupOAPfCz9JIc5vhSkedpMTI= Received: from imap1.dmz-prg2.suse.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by imap1.dmz-prg2.suse.org (Postfix) with ESMTPS id E0D58132CB; Tue, 10 Sep 2024 10:39:40 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id hx5nNewh4Ga3YwAAD6G6ig (envelope-from ); Tue, 10 Sep 2024 10:39:40 +0000 From: Juergen Gross To: linux-kernel@vger.kernel.org, x86@kernel.org Cc: Juergen Gross , Boris Ostrovsky , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" , xen-devel@lists.xenproject.org, =?UTF-8?q?Marek=20Marczykowski-G=C3=B3recki?= , Jan Beulich Subject: [PATCH v3 1/7] xen: use correct end address of kernel for conflict checking Date: Tue, 10 Sep 2024 12:39:26 +0200 Message-ID: <20240910103932.7634-2-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240910103932.7634-1-jgross@suse.com> References: <20240910103932.7634-1-jgross@suse.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-Spam-Score: -3.30 X-Spamd-Result: default: False [-3.30 / 50.00]; BAYES_HAM(-3.00)[100.00%]; MID_CONTAINS_FROM(1.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; MIME_TRACE(0.00)[0:+]; RCVD_VIA_SMTP_AUTH(0.00)[]; RCPT_COUNT_TWELVE(0.00)[12]; ARC_NA(0.00)[]; RCVD_TLS_ALL(0.00)[]; FUZZY_BLOCKED(0.00)[rspamd.com]; TO_DN_SOME(0.00)[]; FROM_HAS_DN(0.00)[]; DKIM_SIGNED(0.00)[suse.com:s=susede1]; FROM_EQ_ENVFROM(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; DBL_BLOCKED_OPENRESOLVER(0.00)[imap1.dmz-prg2.suse.org:helo,suse.com:mid,suse.com:email] X-Spam-Flag: NO X-Spam-Level: When running as a Xen PV dom0 the kernel is loaded by the hypervisor using a different memory map than that of the host. In order to minimize the required changes in the kernel, the kernel adapts its memory map to that of the host. In order to do that it is checking for conflicts of its load address with the host memory map. Unfortunately the tested memory range does not include the .brk area, which might result in crashes or memory corruption when this area does conflict with the memory map of the host. Fix the test by using the _end label instead of __bss_stop. Fixes: 808fdb71936c ("xen: check for kernel memory conflicting with memory = layout") Signed-off-by: Juergen Gross Tested-by: Marek Marczykowski-G=C3=B3recki Reviewed-by: Jan Beulich --- arch/x86/xen/setup.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c index 806ddb2391d9..4bcc70a71b7d 100644 --- a/arch/x86/xen/setup.c +++ b/arch/x86/xen/setup.c @@ -825,7 +825,7 @@ char * __init xen_memory_setup(void) * to relocating (and even reusing) pages with kernel text or data. */ if (xen_is_e820_reserved(__pa_symbol(_text), - __pa_symbol(__bss_stop) - __pa_symbol(_text))) { + __pa_symbol(_end) - __pa_symbol(_text))) { xen_raw_console_write("Xen hypervisor allocated kernel memory conflicts = with E820 map\n"); BUG(); } --=20 2.43.0