linux-kernel - [PATCH] x86/head: Fix incorrect size value of startup_gdt

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Date:   Mon,  7 Aug 2023 16:45:47 +0800
From:   Yuntao Wang <ytcoode@...il.com>
To:     x86@...nel.org, linux-kernel@...r.kernel.org
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Josh Poimboeuf <jpoimboe@...nel.org>,
        Pasha Tatashin <pasha.tatashin@...een.com>,
        Joerg Roedel <jroedel@...e.de>, Yuntao Wang <ytcoode@...il.com>
Subject: [PATCH] x86/head: Fix incorrect size value of startup_gdt_descr

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, fix it.

Fixes: 866b556efa12 ("x86/head/64: Install startup GDT")
Signed-off-by: Yuntao Wang <ytcoode@...il.com>
---
 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 49f7629b17f7..cfd70939a099 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,
 };
 
-- 
2.41.0