x86_64: Use __BOOT_DS instead_of __KERNEL_DS for safety · 2dead15fb8 - Gogs

x86_64: Use __BOOT_DS instead_of __KERNEL_DS for safety

In startup_32, the running code still uses the initial GDT
located in setup. Thus, __BOOT_DS is preferred. Currently
__KERNEL_DS is lucky to equal to __BOOT_DS, but this is
not always a safe way.

Signed-off-by: Lans Zhang <lans.zhang2008@gmail.com>
Link: http://lkml.kernel.org/r/51300267.6000008@gmail.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

Lans Zhang 12 years ago

parent

de1a2262b0

commit

2dead15fb8

1 changed files with 1 additions and 1 deletions

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arch/x86/boot/compressed/head_64.S
							 
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				@@ -52,7 +52,7 @@ ENTRY(startup_32)
			
				 	jnz 1f
			
				 	cli
			
				-	movl	$(__KERNEL_DS), %eax
			
				+	movl	$(__BOOT_DS), %eax
			
				 	movl	%eax, %ds
			
				 	movl	%eax, %es
			
				 	movl	%eax, %ss