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x86/boot: Fix incorrect startup_gdt_descr.size

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[ Upstream commit 001470fed5 ]

Since the size value is added to the base address to yield the last valid
byte address of the GDT, the current size value of startup_gdt_descr is
incorrect (too large by one), fix it.

[ mingo: This probably never mattered, because startup_gdt[] is only used
         in a very controlled fashion - but make it consistent nevertheless. ]

Fixes: 866b556efa ("x86/head/64: Install startup GDT")
Signed-off-by: Yuntao Wang <ytcoode@gmail.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Link: https://lore.kernel.org/r/20230807084547.217390-1-ytcoode@gmail.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Yuntao Wang 2023-08-07 16:45:47 +08:00 committed by Greg Kroah-Hartman
parent c7e8c7452e
commit 81b8638e4e
1 changed files with 1 additions and 1 deletions
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2
arch/x86/kernel/head64.c
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@ -79,7 +79,7 @@ static struct desc_struct startup_gdt[GDT_ENTRIES] = {
* while the kernel still uses a direct mapping.
*/
static struct desc_ptr startup_gdt_descr = {
.size = sizeof(startup_gdt),
.size = sizeof(startup_gdt)-1,
.address = 0,
};