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Message-Id: <20190708174913.123308-7-thgarnie@chromium.org>
Date: Mon, 8 Jul 2019 10:48:59 -0700
From: Thomas Garnier <thgarnie@...omium.org>
To: kernel-hardening@...ts.openwall.com
Cc: kristen@...ux.intel.com,
keescook@...omium.org,
Thomas Garnier <thgarnie@...omium.org>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>,
Borislav Petkov <bp@...en8.de>,
"H. Peter Anvin" <hpa@...or.com>,
x86@...nel.org,
Andrew Morton <akpm@...ux-foundation.org>,
Len Brown <len.brown@...el.com>,
"Peter Zijlstra (Intel)" <peterz@...radead.org>,
Andy Lutomirski <luto@...nel.org>,
linux-kernel@...r.kernel.org
Subject: [PATCH v8 06/11] 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_MOVABS macro instead of
the 'mov $symbol, %dst' construct.
Position Independent Executable (PIE) support will allow to extend the
KASLR randomization range below 0xffffffff80000000.
Signed-off-by: Thomas Garnier <thgarnie@...omium.org>
---
arch/x86/include/asm/processor.h | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index 3eab6ece52b4..3e2154b0e09f 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -713,11 +713,13 @@ static inline void sync_core(void)
"pushfq\n\t"
"mov %%cs, %0\n\t"
"pushq %q0\n\t"
- "pushq $1f\n\t"
+ "movabsq $1f, %q0\n\t"
+ "pushq %q0\n\t"
"iretq\n\t"
UNWIND_HINT_RESTORE
"1:"
- : "=&r" (tmp), ASM_CALL_CONSTRAINT : : "cc", "memory");
+ : "=&r" (tmp), ASM_CALL_CONSTRAINT
+ : : "cc", "memory");
#endif
}
--
2.22.0.410.gd8fdbe21b5-goog
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