6.5-stable review patch. If anyone has any objections, please let me know.
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From: Yuntao Wang ytcoode@gmail.com
[ 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@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 --- arch/x86/kernel/head64.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
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, };