From: Thomas Garnier <thgarnie@google.com> To: "Herbert Xu" <herbert@gondor.apana.org.au>, "David S . Miller" <davem@davemloft.net>, "Thomas Gleixner" <tglx@linutronix.de>, "Ingo Molnar" <mingo@redhat.com>, "H . Peter Anvin" <hpa@zytor.com>, "Peter Zijlstra" <peterz@infradead.org>, "Josh Poimboeuf" <jpoimboe@redhat.com>, "Arnd Bergmann" <arnd@arndb.de>, "Thomas Garnier" <thgarnie@google.com>, "Matthias Kaehlcke" <mka@chromium.org>, "Boris Ostrovsky" <boris.ostrovsky@oracle.com>, "Juergen Gross" <jgross@suse.com>, "Paolo Bonzini" <pbonzini@redhat.com>, "Radim Krčmář" <rkrcmar@redhat.com>, "Joerg Roedel" <joro@8bytes.org>, "Tom Lendacky" <thomas.lendacky@amd.com>, "Andy Lutomirski" <luto@kernel.org>, "Borislav Petkov" <bp@suse.de>, "Brian Gerst" <brgerst@gmail.com>, "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>, "Rafael J . Wysocki" <rjw@rjwysocki.net>, "Len Brown" <len.brown@intel.com>, "Pavel Machek" <pavel@ucw.cz> 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: [RFC v2 10/23] x86/CPU: Adapt assembly for PIE support Date: Thu, 10 Aug 2017 10:26:02 -0700 [thread overview] Message-ID: <20170810172615.51965-11-thgarnie@google.com> (raw) In-Reply-To: <20170810172615.51965-1-thgarnie@google.com> Change the assembly code to use only relative references of symbols for the kernel to be PIE compatible. Use the new _ASM_GET_PTR macro instead of the 'mov $symbol, %dst' construct to not have an absolute reference. Position Independent Executable (PIE) support will allow to extended the KASLR randomization range below the -2G memory limit. Signed-off-by: Thomas Garnier <thgarnie@google.com> --- arch/x86/include/asm/processor.h | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h index c1352771b2f6..14fc21e2df08 100644 --- a/arch/x86/include/asm/processor.h +++ b/arch/x86/include/asm/processor.h @@ -49,7 +49,7 @@ static inline void *current_text_addr(void) { void *pc; - asm volatile("mov $1f, %0; 1:":"=r" (pc)); + asm volatile(_ASM_GET_PTR(1f, %0) "; 1:":"=r" (pc)); return pc; } @@ -689,6 +689,7 @@ static inline void sync_core(void) : "+r" (__sp) : : "memory"); #else unsigned int tmp; + unsigned long tmp2; asm volatile ( UNWIND_HINT_SAVE @@ -699,11 +700,12 @@ static inline void sync_core(void) "pushfq\n\t" "mov %%cs, %0\n\t" "pushq %q0\n\t" - "pushq $1f\n\t" + "leaq 1f(%%rip), %1\n\t" + "pushq %1\n\t" "iretq\n\t" UNWIND_HINT_RESTORE "1:" - : "=&r" (tmp), "+r" (__sp) : : "cc", "memory"); + : "=&r" (tmp), "=&r" (tmp2), "+r" (__sp) : : "cc", "memory"); #endif } -- 2.14.0.434.g98096fd7a8-goog _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org https://lists.xen.org/xen-devel
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From: Thomas Garnier <thgarnie@google.com> To: "Herbert Xu" <herbert@gondor.apana.org.au>, "David S . Miller" <davem@davemloft.net>, "Thomas Gleixner" <tglx@linutronix.de>, "Ingo Molnar" <mingo@redhat.com>, "H . Peter Anvin" <hpa@zytor.com>, "Peter Zijlstra" <peterz@infradead.org>, "Josh Poimboeuf" <jpoimboe@redhat.com>, "Arnd Bergmann" <arnd@arndb.de>, "Thomas Garnier" <thgarnie@google.com>, "Matthias Kaehlcke" <mka@chromium.org>, "Boris Ostrovsky" <boris.ostrovsky@oracle.com>, "Juergen Gross" <jgross@suse.com>, "Paolo Bonzini" <pbonzini@redhat.com>, "Radim Krčmář" <rkrcmar@redhat.com>, "Joerg Roedel" <joro@8bytes.org>, "Tom Lendacky" <thomas.lendacky@amd.com>, "Andy Lutomirski" <luto@kernel.org>, "Borislav Petkov" <bp@suse.de>, "Brian Gerst" <brgerst@gmail.com>, "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>, "Rafael J . Wysocki" <rjw@rjwysocki.net>, "Len Brown" <len.brown@intel.com>, "Pavel Machek" <pavel@ucw.cz>, "Tejun Heo" <tj@kernel.org>, "Christoph Lameter" <cl@linux.com>, "Paul Gortmaker" <paul.gortmaker@windriver.com>, "Chris Metcalf" <cmetcalf@mellanox.com>, "Andrew Morton" <akpm@linux-foundation.org>, "Paul E . McKenney" <paulmck@linux.vnet.ibm.com>, "Nicolas Pitre" <nicolas.pitre@linaro.org>, "Christopher Li" <sparse@chrisli.org>, "Rafael J . Wysocki" <rafael.j.wysocki@intel.com>, "Lukas Wunner" <lukas@wunner.de>, "Mika Westerberg" <mika.westerberg@linux.intel.com>, "Dou Liyang" <douly.fnst@cn.fujitsu.com>, "Daniel Borkmann" <daniel@iogearbox.net>, "Alexei Starovoitov" <ast@kernel.org>, "Masahiro Yamada" <yamada.masahiro@socionext.com>, "Markus Trippelsdorf" <markus@trippelsdorf.de>, "Steven Rostedt" <rostedt@goodmis.org>, "Kees Cook" <keescook@chromium.org>, "Rik van Riel" <riel@redhat.com>, "David Howells" <dhowells@redhat.com>, "Waiman Long" <longman@redhat.com>, "Kyle Huey" <me@kylehuey.com>, "Peter Foley" <pefoley2@pefoley.com>, "Tim Chen" <tim.c.chen@linux.intel.com>, "Catalin Marinas" <catalin.marinas@arm.com>, "Ard Biesheuvel" <ard.biesheuvel@linaro.org>, "Michal Hocko" <mhocko@suse.com>, "Matthew Wilcox" <mawilcox@microsoft.com>, "H . J . Lu" <hjl.tools@gmail.com>, "Paul Bolle" <pebolle@tiscali.nl>, "Rob Landley" <rob@landley.net>, "Baoquan He" <bhe@redhat.com>, "Daniel Micay" <danielmicay@gmail.com> 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 Subject: [kernel-hardening] [RFC v2 10/23] x86/CPU: Adapt assembly for PIE support Date: Thu, 10 Aug 2017 10:26:02 -0700 [thread overview] Message-ID: <20170810172615.51965-11-thgarnie@google.com> (raw) In-Reply-To: <20170810172615.51965-1-thgarnie@google.com> Change the assembly code to use only relative references of symbols for the kernel to be PIE compatible. Use the new _ASM_GET_PTR macro instead of the 'mov $symbol, %dst' construct to not have an absolute reference. Position Independent Executable (PIE) support will allow to extended the KASLR randomization range below the -2G memory limit. Signed-off-by: Thomas Garnier <thgarnie@google.com> --- arch/x86/include/asm/processor.h | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h index c1352771b2f6..14fc21e2df08 100644 --- a/arch/x86/include/asm/processor.h +++ b/arch/x86/include/asm/processor.h @@ -49,7 +49,7 @@ static inline void *current_text_addr(void) { void *pc; - asm volatile("mov $1f, %0; 1:":"=r" (pc)); + asm volatile(_ASM_GET_PTR(1f, %0) "; 1:":"=r" (pc)); return pc; } @@ -689,6 +689,7 @@ static inline void sync_core(void) : "+r" (__sp) : : "memory"); #else unsigned int tmp; + unsigned long tmp2; asm volatile ( UNWIND_HINT_SAVE @@ -699,11 +700,12 @@ static inline void sync_core(void) "pushfq\n\t" "mov %%cs, %0\n\t" "pushq %q0\n\t" - "pushq $1f\n\t" + "leaq 1f(%%rip), %1\n\t" + "pushq %1\n\t" "iretq\n\t" UNWIND_HINT_RESTORE "1:" - : "=&r" (tmp), "+r" (__sp) : : "cc", "memory"); + : "=&r" (tmp), "=&r" (tmp2), "+r" (__sp) : : "cc", "memory"); #endif } -- 2.14.0.434.g98096fd7a8-goog
next prev parent reply other threads:[~2017-08-10 17:26 UTC|newest] Thread overview: 212+ messages / expand[flat|nested] mbox.gz Atom feed top 2017-08-10 17:25 x86: PIE support and option to extend KASLR randomization Thomas Garnier 2017-08-10 17:25 ` [kernel-hardening] " Thomas Garnier 2017-08-10 17:25 ` [RFC v2 01/23] x86/crypto: Adapt assembly for PIE support Thomas Garnier 2017-08-10 17:25 ` [kernel-hardening] " Thomas Garnier 2017-08-10 17:25 ` [RFC v2 02/23] x86: Use symbol name on bug table " Thomas Garnier 2017-08-10 17:25 ` [kernel-hardening] " Thomas Garnier 2017-08-10 17:25 ` [RFC v2 03/23] x86: Use symbol name in jump " Thomas Garnier 2017-08-10 17:25 ` [kernel-hardening] " Thomas Garnier 2017-08-10 17:25 ` [RFC v2 04/23] x86: Add macro to get symbol address " Thomas Garnier 2017-08-10 17:25 ` [kernel-hardening] " Thomas Garnier 2017-08-10 17:25 ` [RFC v2 05/23] xen: Adapt assembly " Thomas Garnier 2017-08-10 17:25 ` [kernel-hardening] " Thomas Garnier 2017-08-10 17:25 ` [RFC v2 06/23] kvm: " Thomas Garnier 2017-08-10 17:25 ` [kernel-hardening] " Thomas Garnier 2017-08-10 17:25 ` [RFC v2 07/23] x86: relocate_kernel - " Thomas Garnier 2017-08-10 17:25 ` [kernel-hardening] " Thomas Garnier 2017-08-10 17:26 ` [RFC v2 08/23] x86/entry/64: " Thomas Garnier 2017-08-10 17:26 ` [kernel-hardening] " Thomas Garnier 2017-08-10 17:26 ` [RFC v2 09/23] x86: pm-trace - " Thomas Garnier 2017-08-10 17:26 ` [kernel-hardening] " Thomas Garnier 2017-08-10 17:26 ` Thomas Garnier [this message] 2017-08-10 17:26 ` [kernel-hardening] [RFC v2 10/23] x86/CPU: " Thomas Garnier 2017-08-10 17:26 ` [RFC v2 11/23] x86/acpi: " Thomas Garnier 2017-08-10 17:26 ` [kernel-hardening] " Thomas Garnier 2017-08-10 17:26 ` [RFC v2 12/23] x86/boot/64: " Thomas Garnier 2017-08-10 17:26 ` [kernel-hardening] " Thomas Garnier 2017-08-10 17:26 ` [RFC v2 13/23] x86/power/64: " Thomas Garnier 2017-08-10 17:26 ` [kernel-hardening] " Thomas Garnier 2017-08-11 12:36 ` Pavel Machek 2017-08-11 12:36 ` Pavel Machek 2017-08-11 12:36 ` [kernel-hardening] " Pavel Machek 2017-08-11 15:09 ` Thomas Garnier 2017-08-11 15:09 ` [kernel-hardening] " Thomas Garnier 2017-08-11 15:09 ` Thomas Garnier 2017-08-10 17:26 ` [RFC v2 14/23] x86/paravirt: " Thomas Garnier 2017-08-10 17:26 ` [kernel-hardening] " Thomas Garnier 2017-08-10 17:26 ` [RFC v2 15/23] x86/boot/64: Use _text in a global " Thomas Garnier 2017-08-10 17:26 ` [kernel-hardening] " Thomas Garnier 2017-08-10 17:26 ` [RFC v2 16/23] x86/percpu: Adapt percpu " Thomas Garnier 2017-08-10 17:26 ` [kernel-hardening] " Thomas Garnier 2017-08-10 17:26 ` [RFC v2 17/23] compiler: Option to default to hidden symbols Thomas Garnier 2017-08-10 17:26 ` [kernel-hardening] " Thomas Garnier 2017-08-10 17:26 ` [RFC v2 18/23] x86/relocs: Handle DYN relocations for PIE support Thomas Garnier 2017-08-10 17:26 ` [kernel-hardening] " Thomas Garnier 2017-08-10 17:26 ` [RFC v2 19/23] x86: Support global stack cookie Thomas Garnier 2017-08-10 17:26 ` [kernel-hardening] " Thomas Garnier 2017-08-10 17:26 ` [RFC v2 20/23] x86/pie: Add option to build the kernel as PIE for x86_64 Thomas Garnier 2017-08-10 17:26 ` [kernel-hardening] " Thomas Garnier 2017-08-10 17:26 ` [RFC v2 21/23] x86/relocs: Add option to generate 64-bit relocations Thomas Garnier 2017-08-10 17:26 ` [kernel-hardening] " Thomas Garnier 2017-08-10 17:26 ` [RFC v2 22/23] x86/module: Add support for mcmodel large and PLTs Thomas Garnier 2017-08-10 17:26 ` [kernel-hardening] " Thomas Garnier 2017-08-10 17:26 ` [RFC v2 23/23] x86/kaslr: Add option to extend KASLR range from 1GB to 3GB Thomas Garnier 2017-08-10 17:26 ` [kernel-hardening] " Thomas Garnier 2017-08-11 12:41 ` x86: PIE support and option to extend KASLR randomization Ingo Molnar 2017-08-11 12:41 ` [kernel-hardening] " Ingo Molnar 2017-08-11 15:09 ` Thomas Garnier 2017-08-11 15:09 ` Thomas Garnier 2017-08-11 15:09 ` [kernel-hardening] " Thomas Garnier 2017-08-15 7:56 ` Ingo Molnar 2017-08-15 7:56 ` Ingo Molnar 2017-08-15 7:56 ` [kernel-hardening] " Ingo Molnar 2017-08-15 12:15 ` Jordan Glover 2017-08-15 13:42 ` Rik van Riel 2017-08-15 14:20 ` Thomas Garnier 2017-08-15 14:20 ` Thomas Garnier 2017-08-15 14:20 ` [kernel-hardening] " Thomas Garnier 2017-08-15 14:47 ` Daniel Micay 2017-08-15 14:47 ` Daniel Micay 2017-08-15 14:47 ` [kernel-hardening] " Daniel Micay 2017-08-15 14:58 ` Thomas Garnier 2017-08-15 14:58 ` Thomas Garnier 2017-08-15 14:58 ` [kernel-hardening] " Thomas Garnier 2017-08-16 15:12 ` Ingo Molnar 2017-08-16 15:12 ` Ingo Molnar 2017-08-16 15:12 ` [kernel-hardening] " Ingo Molnar 2017-08-16 16:09 ` Christopher Lameter 2017-08-16 16:09 ` Christopher Lameter 2017-08-16 16:09 ` [kernel-hardening] " Christopher Lameter 2017-08-16 16:26 ` Daniel Micay 2017-08-16 16:26 ` [kernel-hardening] " Daniel Micay 2017-08-16 16:32 ` Ard Biesheuvel 2017-08-16 16:32 ` Ard Biesheuvel 2017-08-16 16:32 ` [kernel-hardening] " Ard Biesheuvel 2017-08-16 16:26 ` Daniel Micay 2017-08-16 16:57 ` Thomas Garnier 2017-08-16 16:57 ` Thomas Garnier 2017-08-16 16:57 ` [kernel-hardening] " Thomas Garnier 2017-08-17 8:09 ` Ingo Molnar 2017-08-17 8:09 ` Ingo Molnar 2017-08-17 8:09 ` [kernel-hardening] " Ingo Molnar 2017-08-17 14:10 ` Thomas Garnier 2017-08-17 14:10 ` Thomas Garnier 2017-08-17 14:10 ` [kernel-hardening] " Thomas Garnier 2017-08-24 21:13 ` Thomas Garnier 2017-08-24 21:13 ` Thomas Garnier 2017-08-24 21:13 ` [kernel-hardening] " Thomas Garnier 2017-08-24 21:42 ` Linus Torvalds 2017-08-24 21:42 ` Linus Torvalds 2017-08-24 21:42 ` [kernel-hardening] " Linus Torvalds 2017-08-25 15:35 ` Thomas Garnier 2017-08-25 15:35 ` [kernel-hardening] " Thomas Garnier 2017-08-25 15:35 ` Thomas Garnier 2017-08-25 1:07 ` Steven Rostedt 2017-08-25 1:07 ` [kernel-hardening] " Steven Rostedt 2017-08-25 8:04 ` Ingo Molnar 2017-08-25 8:04 ` Ingo Molnar 2017-08-25 8:04 ` [kernel-hardening] " Ingo Molnar 2017-08-25 15:05 ` Thomas Garnier 2017-08-25 15:05 ` Thomas Garnier 2017-08-25 15:05 ` [kernel-hardening] " Thomas Garnier 2017-08-29 19:34 ` Thomas Garnier 2017-08-29 19:34 ` [kernel-hardening] " Thomas Garnier 2017-09-21 15:59 ` Ingo Molnar 2017-09-21 15:59 ` [kernel-hardening] " Ingo Molnar 2017-09-21 16:10 ` Ard Biesheuvel 2017-09-21 16:10 ` Ard Biesheuvel 2017-09-21 16:10 ` [kernel-hardening] " Ard Biesheuvel 2017-09-21 21:21 ` Thomas Garnier 2017-09-21 21:21 ` Thomas Garnier 2017-09-21 21:21 ` [kernel-hardening] " Thomas Garnier 2017-09-22 4:24 ` Markus Trippelsdorf 2017-09-22 4:24 ` [kernel-hardening] " Markus Trippelsdorf 2017-09-22 14:38 ` Thomas Garnier 2017-09-22 14:38 ` [kernel-hardening] " Thomas Garnier 2017-09-22 14:38 ` Thomas Garnier 2017-09-22 23:55 ` Thomas Garnier 2017-09-22 23:55 ` Thomas Garnier 2017-09-22 23:55 ` [kernel-hardening] " Thomas Garnier 2017-09-21 21:16 ` Thomas Garnier 2017-09-21 21:16 ` [kernel-hardening] " Thomas Garnier 2017-09-22 0:06 ` Thomas Garnier 2017-09-22 0:06 ` Thomas Garnier 2017-09-22 0:06 ` [kernel-hardening] " Thomas Garnier 2017-09-22 16:32 ` Ingo Molnar 2017-09-22 16:32 ` [kernel-hardening] " Ingo Molnar 2017-09-22 18:08 ` Thomas Garnier 2017-09-22 18:08 ` Thomas Garnier 2017-09-22 18:08 ` [kernel-hardening] " Thomas Garnier 2017-09-23 9:43 ` Ingo Molnar 2017-09-23 9:43 ` [kernel-hardening] " Ingo Molnar 2017-10-02 20:28 ` Thomas Garnier 2017-10-02 20:28 ` Thomas Garnier 2017-10-02 20:28 ` [kernel-hardening] " Thomas Garnier 2017-09-23 9:43 ` Ingo Molnar 2017-09-22 18:38 ` H. Peter Anvin 2017-09-22 18:38 ` [kernel-hardening] " H. Peter Anvin 2017-09-22 18:57 ` Kees Cook 2017-09-22 18:57 ` [kernel-hardening] " Kees Cook 2017-09-22 19:06 ` H. Peter Anvin 2017-09-22 19:06 ` [kernel-hardening] " H. Peter Anvin 2017-09-22 22:19 ` hjl.tools 2017-09-22 22:30 ` hjl.tools 2017-09-22 19:06 ` H. Peter Anvin 2017-09-22 18:57 ` Kees Cook 2017-09-22 18:59 ` Thomas Garnier 2017-09-22 18:59 ` Thomas Garnier 2017-09-22 18:59 ` [kernel-hardening] " Thomas Garnier 2017-09-23 9:49 ` Ingo Molnar 2017-09-23 9:49 ` Ingo Molnar 2017-09-23 9:49 ` [kernel-hardening] " Ingo Molnar 2017-09-22 18:38 ` H. Peter Anvin 2017-09-22 16:32 ` Ingo Molnar 2017-09-21 21:16 ` Thomas Garnier 2017-09-21 15:59 ` Ingo Molnar 2017-08-29 19:34 ` Thomas Garnier 2017-08-17 14:12 ` Boris Lukashev 2017-08-17 14:12 ` [kernel-hardening] " Boris Lukashev 2017-08-25 15:38 ` Christopher Lameter 2017-08-25 15:38 ` [kernel-hardening] " Christopher Lameter 2017-08-27 22:39 ` Boris Lukashev 2017-08-27 22:39 ` Boris Lukashev 2017-08-27 22:39 ` [kernel-hardening] " Boris Lukashev 2017-08-25 15:38 ` Christopher Lameter 2017-08-28 9:59 ` Pavel Machek 2017-08-28 9:59 ` Pavel Machek 2017-08-28 9:59 ` [kernel-hardening] " Pavel Machek 2017-08-17 14:12 ` Boris Lukashev 2017-08-21 13:32 ` Peter Zijlstra 2017-08-21 13:32 ` [kernel-hardening] " Peter Zijlstra 2017-08-21 14:28 ` Peter Zijlstra 2017-08-21 14:28 ` Peter Zijlstra 2017-08-21 14:28 ` [kernel-hardening] " Peter Zijlstra 2017-09-22 18:27 ` H. Peter Anvin 2017-09-22 18:27 ` [kernel-hardening] " H. Peter Anvin 2017-09-23 10:00 ` Ingo Molnar 2017-09-23 10:00 ` [kernel-hardening] " Ingo Molnar 2017-09-24 22:37 ` Pavel Machek 2017-09-24 22:37 ` [kernel-hardening] " Pavel Machek 2017-09-25 7:33 ` Ingo Molnar 2017-09-25 7:33 ` Ingo Molnar 2017-09-25 7:33 ` [kernel-hardening] " Ingo Molnar 2017-10-06 10:39 ` Pavel Machek 2017-10-06 10:39 ` Pavel Machek 2017-10-06 10:39 ` [kernel-hardening] " Pavel Machek 2017-10-20 8:13 ` Ingo Molnar 2017-10-20 8:13 ` [kernel-hardening] " Ingo Molnar 2017-10-20 8:13 ` Ingo Molnar 2017-09-24 22:37 ` Pavel Machek 2017-09-23 10:00 ` Ingo Molnar 2017-09-22 18:27 ` H. Peter Anvin 2017-08-21 13:32 ` Peter Zijlstra 2017-08-21 14:31 ` Peter Zijlstra 2017-08-21 14:31 ` [kernel-hardening] " Peter Zijlstra 2017-08-21 15:57 ` Thomas Garnier 2017-08-21 15:57 ` Thomas Garnier 2017-08-21 15:57 ` [kernel-hardening] " Thomas Garnier 2017-08-28 1:26 ` H. Peter Anvin 2017-08-28 1:26 ` [kernel-hardening] " H. Peter Anvin 2017-08-28 1:26 ` H. Peter Anvin 2017-08-21 14:31 ` Peter Zijlstra 2017-08-11 12:41 ` Ingo Molnar
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