This is a note to let you know that I've just added the patch titled
x86/boot: Fix incorrect startup_gdt_descr.size
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
x86-boot-fix-incorrect-startup_gdt_descr.size.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 175c3b4e12ae1c878b708b27a8dbda21a35e7471
Author: Yuntao Wang <ytcoode@xxxxxxxxx>
Date: Mon Aug 7 16:45:47 2023 +0800
x86/boot: Fix incorrect startup_gdt_descr.size
[ Upstream commit 001470fed5959d01faecbd57fcf2f60294da0de1 ]
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: 866b556efa12 ("x86/head/64: Install startup GDT")
Signed-off-by: Yuntao Wang <ytcoode@xxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Link: https://lore.kernel.org/r/20230807084547.217390-1-ytcoode@xxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c
index 49f7629b17f73..bbc21798df10e 100644
--- a/arch/x86/kernel/head64.c
+++ b/arch/x86/kernel/head64.c
@@ -80,7 +80,7 @@ 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,
};
