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From: "Hou Wenlong" <houwenlong.hwl@antgroup.com>
To: linux-kernel@vger.kernel.org
Cc: "Thomas Garnier" <thgarnie@chromium.org>,
"Lai Jiangshan" <jiangshan.ljs@antgroup.com>,
"Kees Cook" <keescook@chromium.org>,
"Hou Wenlong" <houwenlong.hwl@antgroup.com>,
"Thomas Gleixner" <tglx@linutronix.de>, "Ingo Molnar" <mingo@redhat.com>,
"Borislav Petkov" <bp@alien8.de>,
"Dave Hansen" <dave.hansen@linux.intel.com>, <x86@kernel.org>,
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"Josh Poimboeuf" <jpoimboe@kernel.org>,
"Konrad Rzeszutek Wilk" <konrad.wilk@oracle.com>
Subject: [PATCH RFC 03/43] x86: relocate_kernel - Adapt assembly for PIE
support
Date: Fri, 28 Apr 2023 17:50:43 +0800
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| Series |
x86/pie: Make kernel image's virtual address flexible
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Commit Message
Hou Wenlong
April 28, 2023, 9:50 a.m. UTC
From: Thomas Garnier <thgarnie@chromium.org> From: Thomas Garnier <thgarnie@chromium.org> Change the assembly code to use only absolute references of symbols for the kernel to be PIE compatible. Signed-off-by: Thomas Garnier <thgarnie@chromium.org> Signed-off-by: Hou Wenlong <houwenlong.hwl@antgroup.com> Cc: Lai Jiangshan <jiangshan.ljs@antgroup.com> Cc: Kees Cook <keescook@chromium.org> --- arch/x86/kernel/relocate_kernel_64.S | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/kernel/relocate_kernel_64.S b/arch/x86/kernel/relocate_kernel_64.S index 56cab1bb25f5..05d916e9df47 100644 --- a/arch/x86/kernel/relocate_kernel_64.S +++ b/arch/x86/kernel/relocate_kernel_64.S @@ -223,7 +223,7 @@ SYM_CODE_START_LOCAL_NOALIGN(identity_mapped) movq %rax, %cr3 lea PAGE_SIZE(%r8), %rsp call swap_pages - movq $virtual_mapped, %rax + movabsq $virtual_mapped, %rax pushq %rax ANNOTATE_UNRET_SAFE ret