[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <20171004212003.28296-9-thgarnie@google.com>
Date: Wed, 4 Oct 2017 14:19:44 -0700
From: Thomas Garnier <thgarnie@...gle.com>
To: Herbert Xu <herbert@...dor.apana.org.au>,
"David S . Miller" <davem@...emloft.net>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>,
"H . Peter Anvin" <hpa@...or.com>,
Peter Zijlstra <peterz@...radead.org>,
Josh Poimboeuf <jpoimboe@...hat.com>,
Thomas Garnier <thgarnie@...gle.com>,
Arnd Bergmann <arnd@...db.de>,
Kees Cook <keescook@...omium.org>,
Matthias Kaehlcke <mka@...omium.org>,
Tom Lendacky <thomas.lendacky@....com>,
Andy Lutomirski <luto@...nel.org>,
"Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
Borislav Petkov <bp@...e.de>,
"Rafael J . Wysocki" <rjw@...ysocki.net>,
Len Brown <len.brown@...el.com>,
Pavel Machek <pavel@....cz>,
Juergen Gross <jgross@...e.com>,
Chris Wright <chrisw@...s-sol.org>,
Alok Kataria <akataria@...are.com>,
Rusty Russell <rusty@...tcorp.com.au>,
Tejun Heo <tj@...nel.org>,
Christoph Lameter <cl@...ux.com>,
Boris Ostrovsky <boris.ostrovsky@...cle.com>,
Alexey Dobriyan <adobriyan@...il.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Paul Gortmaker <paul.gortmaker@...driver.com>,
Chris Metcalf <cmetcalf@...lanox.com>,
"Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
Nicolas Pitre <nicolas.pitre@...aro.org>,
Borislav Petkov <bp@...en8.de>,
"Luis R . Rodriguez" <mcgrof@...nel.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Christopher Li <sparse@...isli.org>,
Steven Rostedt <rostedt@...dmis.org>,
Jason Baron <jbaron@...mai.com>,
Dou Liyang <douly.fnst@...fujitsu.com>,
"Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
Mika Westerberg <mika.westerberg@...ux.intel.com>,
Lukas Wunner <lukas@...ner.de>,
Masahiro Yamada <yamada.masahiro@...ionext.com>,
Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Markus Trippelsdorf <markus@...ppelsdorf.de>,
Paolo Bonzini <pbonzini@...hat.com>,
Radim Krčmář <rkrcmar@...hat.com>,
Joerg Roedel <joro@...tes.org>,
Rik van Riel <riel@...hat.com>,
David Howells <dhowells@...hat.com>,
Ard Biesheuvel <ard.biesheuvel@...aro.org>,
Waiman Long <longman@...hat.com>,
Kyle Huey <me@...ehuey.com>,
Andrey Ryabinin <aryabinin@...tuozzo.com>,
Jonathan Corbet <corbet@....net>,
Matthew Wilcox <mawilcox@...rosoft.com>,
Michal Hocko <mhocko@...e.com>,
Peter Foley <pefoley2@...oley.com>,
Paul Bolle <pebolle@...cali.nl>,
Jiri Kosina <jkosina@...e.cz>,
Rob Landley <rob@...dley.net>,
"H . J . Lu" <hjl.tools@...il.com>,
Baoquan He <bhe@...hat.com>,
Jan H . Schönherr <jschoenh@...zon.de>,
Daniel Micay <danielmicay@...il.com>
Cc: x86@...nel.org,
linux-crypto@...r.kernel.org,
linux-kernel@...r.kernel.org,
linux-pm@...r.kernel.org,
virtualization@...ts.linux-foundation.org,
xen-devel@...ts.xenproject.org,
linux-arch@...r.kernel.org,
linux-sparse@...r.kernel.org,
kvm@...r.kernel.org,
linux-doc@...r.kernel.org,
kernel-hardening@...ts.openwall.com
Subject: [RFC v3 08/27] x86/CPU: Adapt assembly for PIE support
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@...gle.com>
---
arch/x86/include/asm/processor.h | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index b446c5a082ad..b09bd50b06c7 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;
}
@@ -695,6 +695,7 @@ static inline void sync_core(void)
: ASM_CALL_CONSTRAINT : : "memory");
#else
unsigned int tmp;
+ unsigned long tmp2;
asm volatile (
UNWIND_HINT_SAVE
@@ -705,11 +706,13 @@ 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), ASM_CALL_CONSTRAINT : : "cc", "memory");
+ : "=&r" (tmp), "=&r" (tmp2), ASM_CALL_CONSTRAINT
+ : : "cc", "memory");
#endif
}
--
2.14.2.920.gcf0c67979c-goog
Powered by blists - more mailing lists
Confused about mailing lists and their use?
Read about mailing lists on Wikipedia
and check out these
guidelines on proper formatting of your messages.
