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Message-Id: <20180625224014.134829-13-thgarnie@google.com> Date: Mon, 25 Jun 2018 15:39:00 -0700 From: Thomas Garnier <thgarnie@...gle.com> To: kernel-hardening@...ts.openwall.com Cc: Thomas Garnier <thgarnie@...gle.com>, Juergen Gross <jgross@...e.com>, Alok Kataria <akataria@...are.com>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org, virtualization@...ts.linux-foundation.org, linux-kernel@...r.kernel.org Subject: [PATCH v5 12/27] x86/paravirt: Adapt assembly for PIE support if PIE is enabled, switch the paravirt assembly constraints to be compatible. The %c/i constrains generate smaller code so is kept by default. Position Independent Executable (PIE) support will allow to extend the KASLR randomization range 0xffffffff80000000. Signed-off-by: Thomas Garnier <thgarnie@...gle.com> --- arch/x86/include/asm/paravirt_types.h | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/arch/x86/include/asm/paravirt_types.h b/arch/x86/include/asm/paravirt_types.h index 180bc0bff0fb..140747a98d94 100644 --- a/arch/x86/include/asm/paravirt_types.h +++ b/arch/x86/include/asm/paravirt_types.h @@ -337,9 +337,17 @@ extern struct pv_lock_ops pv_lock_ops; #define PARAVIRT_PATCH(x) \ (offsetof(struct paravirt_patch_template, x) / sizeof(void *)) +#ifdef CONFIG_X86_PIE +#define paravirt_opptr_call "a" +#define paravirt_opptr_type "p" +#else +#define paravirt_opptr_call "c" +#define paravirt_opptr_type "i" +#endif + #define paravirt_type(op) \ [paravirt_typenum] "i" (PARAVIRT_PATCH(op)), \ - [paravirt_opptr] "i" (&(op)) + [paravirt_opptr] paravirt_opptr_type (&(op)) #define paravirt_clobber(clobber) \ [paravirt_clobber] "i" (clobber) @@ -395,7 +403,7 @@ int paravirt_disable_iospace(void); */ #define PARAVIRT_CALL \ ANNOTATE_RETPOLINE_SAFE \ - "call *%c[paravirt_opptr];" + "call *%" paravirt_opptr_call "[paravirt_opptr];" /* * These macros are intended to wrap calls through one of the paravirt -- 2.18.0.rc2.346.g013aa6912e-goog
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