From patchwork Thu Aug 10 17:25:54 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Garnier X-Patchwork-Id: 9894297 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 4A8C360236 for ; Thu, 10 Aug 2017 17:27:56 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 310FA286CF for ; Thu, 10 Aug 2017 17:27:56 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 23893288A7; Thu, 10 Aug 2017 17:27:56 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.1 required=2.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED, DKIM_SIGNED, RCVD_IN_DNSWL_MED, T_DKIM_INVALID autolearn=ham version=3.3.1 Received: from mother.openwall.net (mother.openwall.net [195.42.179.200]) by mail.wl.linuxfoundation.org (Postfix) with SMTP id 46962286CF for ; Thu, 10 Aug 2017 17:27:55 +0000 (UTC) Received: (qmail 32241 invoked by uid 550); 10 Aug 2017 17:26:59 -0000 Mailing-List: contact kernel-hardening-help@lists.openwall.com; run by ezmlm Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-ID: Delivered-To: mailing list kernel-hardening@lists.openwall.com Received: (qmail 32067 invoked from network); 10 Aug 2017 17:26:58 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=q4LNrH8H3pbuj4XoLzHd4HN0r3W9GRabhffIqALfjtE=; b=A4GnvcYx451KDs7D9iEEUY3MyQyl1a1xgey5lA6jNT0vDVsqZZVO9inAse1mTV5Jys jXnn8oeVc7pSCocCGI3V0lCcxntARh6KpX0ISvvd15p8M4w+azWxbhXxxBsmv2mmlptE 25MTtrBxXBzstWwE3y/v8ywk0N/orGmmAyb1Ucr5V/4TVGI5rYSH/UqfHLtMKk9p4HNB XxndNudfvYUvhAch7inkO4c/+P+OQktyNz18iCXgEvl6HYcoT6i0/gB0A++IL9MkcwNv pXWtmCYeDKzQc0pZ7JWDQ6/sW+4Oi12HiqSh408Ignr9av5IuXtjiMzDrEhzNy5Ymeoe Yaeg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=q4LNrH8H3pbuj4XoLzHd4HN0r3W9GRabhffIqALfjtE=; b=k05XqFQBmYD6C/MPHrHg5gJ9BvXHHmTu92g5TdTAStCz3u1ujRCY9GycyZNQaZW9Oz dLO2fGD16wLDYH39iHrYb9M3+yBs3Am+DECkQ5u+XPxWzjWo+uwZFLO2R/VPJS/dXI/e 1t2PMNBAWpW2dotsUPA0ZLTOBQ3hIbY/5MJer7DlNC8WujxbGKqqPnpGW+8hxXPXgFvC yPCdGwadcmRdY5SA11L98eXRo+2zrcQeeW0UoYCHm5NQUuLrr7tiVPiiYoBhnOQkG5Gk E1qAMA3IyDyyXccXcnltT485D+YHmseirnCsULNMGC7nL+nlH5OOZmnwJ6pY+ZpnbARg 4PVg== X-Gm-Message-State: AHYfb5gkjbyI6QBhtyS/YXXA5Gc+5gqYPR6iByX8b7iAHdazfbtUnLpp I7WJoGrbn/1kdktm X-Received: by 10.84.232.204 with SMTP id x12mr14205269plm.362.1502386006127; Thu, 10 Aug 2017 10:26:46 -0700 (PDT) From: Thomas Garnier To: Herbert Xu , "David S . Miller" , Thomas Gleixner , Ingo Molnar , "H . Peter Anvin" , Peter Zijlstra , Josh Poimboeuf , Arnd Bergmann , Thomas Garnier , Matthias Kaehlcke , Boris Ostrovsky , Juergen Gross , Paolo Bonzini , =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= , Joerg Roedel , Tom Lendacky , Andy Lutomirski , Borislav Petkov , Brian Gerst , "Kirill A . Shutemov" , "Rafael J . Wysocki" , Len Brown , Pavel Machek , Tejun Heo , Christoph Lameter , Paul Gortmaker , Chris Metcalf , Andrew Morton , "Paul E . McKenney" , Nicolas Pitre , Christopher Li , "Rafael J . Wysocki" , Lukas Wunner , Mika Westerberg , Dou Liyang , Daniel Borkmann , Alexei Starovoitov , Masahiro Yamada , Markus Trippelsdorf , Steven Rostedt , Kees Cook , Rik van Riel , David Howells , Waiman Long , Kyle Huey , Peter Foley , Tim Chen , Catalin Marinas , Ard Biesheuvel , Michal Hocko , Matthew Wilcox , "H . J . Lu" , Paul Bolle , Rob Landley , Baoquan He , Daniel Micay Cc: x86@kernel.org, linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org, xen-devel@lists.xenproject.org, kvm@vger.kernel.org, linux-pm@vger.kernel.org, linux-arch@vger.kernel.org, linux-sparse@vger.kernel.org, kernel-hardening@lists.openwall.com Date: Thu, 10 Aug 2017 10:25:54 -0700 Message-Id: <20170810172615.51965-3-thgarnie@google.com> X-Mailer: git-send-email 2.14.0.434.g98096fd7a8-goog In-Reply-To: <20170810172615.51965-1-thgarnie@google.com> References: <20170810172615.51965-1-thgarnie@google.com> Subject: [kernel-hardening] [RFC v2 02/23] x86: Use symbol name on bug table for PIE support X-Virus-Scanned: ClamAV using ClamSMTP Replace the %c constraint with %P. The %c is incompatible with PIE because it implies an immediate value whereas %P reference a symbol. Position Independent Executable (PIE) support will allow to extended the KASLR randomization range below the -2G memory limit. Signed-off-by: Thomas Garnier --- arch/x86/include/asm/bug.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/include/asm/bug.h b/arch/x86/include/asm/bug.h index aa6b2023d8f8..1210d22ad547 100644 --- a/arch/x86/include/asm/bug.h +++ b/arch/x86/include/asm/bug.h @@ -37,7 +37,7 @@ do { \ asm volatile("1:\t" ins "\n" \ ".pushsection __bug_table,\"aw\"\n" \ "2:\t" __BUG_REL(1b) "\t# bug_entry::bug_addr\n" \ - "\t" __BUG_REL(%c0) "\t# bug_entry::file\n" \ + "\t" __BUG_REL(%P0) "\t# bug_entry::file\n" \ "\t.word %c1" "\t# bug_entry::line\n" \ "\t.word %c2" "\t# bug_entry::flags\n" \ "\t.org 2b+%c3\n" \