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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 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> Cc: linux-arch@vger.kernel.org, kvm@vger.kernel.org, linux-pm@vger.kernel.org, x86@kernel.org, linux-kernel@vger.kernel.org, linux-sparse@vger.kernel.org, linux-crypto@vger.kernel.org, kernel-hardening@lists.openwall.com, xen-devel@lists.xenproject.org Subject: [Xen-devel] [RFC v2 02/23] x86: Use symbol name on bug table for PIE support X-BeenThere: xen-devel@lists.xen.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: xen-devel-bounces@lists.xen.org Sender: "Xen-devel" 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" \