From: Kees Cook <keescook@chromium.org>
To: Thomas Garnier <thgarnie@chromium.org>
Cc: kernel-hardening@lists.openwall.com, kristen@linux.intel.com,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
"H. Peter Anvin" <hpa@zytor.com>,
x86@kernel.org, Andy Lutomirski <luto@kernel.org>,
"Peter Zijlstra (Intel)" <peterz@infradead.org>,
Len Brown <len.brown@intel.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v11 06/11] x86/CPU: Adapt assembly for PIE support
Date: Mon, 2 Mar 2020 20:58:00 -0800 [thread overview]
Message-ID: <202003022057.D84B66E042@keescook> (raw)
In-Reply-To: <20200228000105.165012-7-thgarnie@chromium.org>
On Thu, Feb 27, 2020 at 04:00:51PM -0800, Thomas Garnier wrote:
> Change the assembly code to use only relative references of symbols for the
> kernel to be PIE compatible.
>
> Signed-off-by: Thomas Garnier <thgarnie@chromium.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
-Kees
> ---
> 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 09705ccc393c..fdf6366c482d 100644
> --- a/arch/x86/include/asm/processor.h
> +++ b/arch/x86/include/asm/processor.h
> @@ -746,11 +746,13 @@ 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), %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
> }
>
> --
> 2.25.1.481.gfbce0eb801-goog
>
--
Kees Cook
next prev parent reply other threads:[~2020-03-03 4:58 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-28 0:00 [PATCH v11 00/11] x86: PIE support to extend KASLR randomization Thomas Garnier
2020-02-28 0:00 ` Thomas Garnier
2020-02-28 0:00 ` [PATCH v11 01/11] x86/crypto: Adapt assembly for PIE support Thomas Garnier
2020-02-28 0:00 ` [PATCH v11 02/11] x86: Add macro to get symbol address " Thomas Garnier
2020-02-28 0:00 ` [PATCH v11 03/11] x86: relocate_kernel - Adapt assembly " Thomas Garnier
2020-02-28 0:00 ` [PATCH v11 04/11] x86/entry/64: " Thomas Garnier
2020-02-28 0:00 ` [PATCH v11 05/11] x86: pm-trace - " Thomas Garnier
2020-02-28 0:00 ` [PATCH v11 06/11] x86/CPU: " Thomas Garnier
2020-03-03 4:58 ` Kees Cook [this message]
2020-02-28 0:00 ` [PATCH v11 07/11] x86/acpi: " Thomas Garnier
2020-02-28 0:00 ` [PATCH v11 08/11] x86/boot/64: " Thomas Garnier
2020-02-28 0:00 ` [PATCH v11 09/11] x86/power/64: " Thomas Garnier
2020-02-28 0:00 ` [PATCH v11 10/11] x86/paravirt: " Thomas Garnier
2020-02-28 0:00 ` [PATCH v11 11/11] x86/alternatives: " Thomas Garnier
2020-03-03 4:59 ` Kees Cook
2020-03-03 5:02 ` [PATCH v11 00/11] x86: PIE support to extend KASLR randomization Kees Cook
2020-03-03 5:02 ` Kees Cook
2020-03-03 9:55 ` Peter Zijlstra
2020-03-03 9:55 ` Peter Zijlstra
2020-03-03 15:43 ` Thomas Garnier
2020-03-03 15:43 ` Thomas Garnier
2020-03-03 21:01 ` Kristen Carlson Accardi
2020-03-03 21:01 ` Kristen Carlson Accardi
2020-03-03 21:19 ` Kees Cook
2020-03-03 21:19 ` Kees Cook
2020-03-04 9:21 ` Peter Zijlstra
2020-03-04 9:21 ` Peter Zijlstra
2020-03-04 18:21 ` Kees Cook
2020-03-04 18:21 ` Kees Cook
2020-03-04 18:44 ` H. Peter Anvin
2020-03-04 18:44 ` H. Peter Anvin
2020-03-04 19:19 ` Thomas Garnier
2020-03-04 19:19 ` Thomas Garnier
2020-03-04 19:22 ` H. Peter Anvin
2020-03-04 19:22 ` H. Peter Anvin
2020-03-04 9:40 ` H. Peter Anvin
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