diff mbox series

[v2,6/7] x86/boot: GDT limit value should be size - 1

Message ID 20200202171353.3736319-7-nivedita@alum.mit.edu
State New
Headers show
Series x86/efi,boot: GDT handling cleanup/fixes | expand

Commit Message

Arvind Sankar Feb. 2, 2020, 5:13 p.m. UTC 
The limit value for the GDTR should be such that adding it to the base
address gives the address of the last byte of the GDT, i.e. it should be
one less than the size, not the size.

Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu>
---
 arch/x86/boot/compressed/head_64.S | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/arch/x86/boot/compressed/head_64.S b/arch/x86/boot/compressed/head_64.S
index 69cc6c68741e..c36e6156b6a3 100644
--- a/arch/x86/boot/compressed/head_64.S
+++ b/arch/x86/boot/compressed/head_64.S
@@ -624,12 +624,12 @@  SYM_FUNC_END(.Lno_longmode)
 
 	.data
 SYM_DATA_START_LOCAL(gdt64)
-	.word	gdt_end - gdt
+	.word	gdt_end - gdt - 1
 	.quad   0
 SYM_DATA_END(gdt64)
 	.balign	8
 SYM_DATA_START_LOCAL(gdt)
-	.word	gdt_end - gdt
+	.word	gdt_end - gdt - 1
 	.long	gdt
 	.word	0
 	.quad	0x00cf9a000000ffff	/* __KERNEL32_CS */