From: Ard Biesheuvel <ardb+git@google.com>
To: linux-kernel@vger.kernel.org
Cc: Ard Biesheuvel <ardb@kernel.org>,
Jason Andryuk <jason.andryuk@amd.com>,
Juergen Gross <jgross@suse.com>,
Boris Ostrovsky <boris.ostrovsky@oracle.com>,
x86@kernel.org, xen-devel@lists.xenproject.org
Subject: [PATCH v2 2/5] x86/pvh: Use correct size value in GDT descriptor
Date: Mon, 30 Sep 2024 09:15:16 +0200 [thread overview]
Message-ID: <20240930071513.909462-9-ardb+git@google.com> (raw)
In-Reply-To: <20240930071513.909462-7-ardb+git@google.com>
From: Ard Biesheuvel <ardb@kernel.org>
The limit field in a GDT descriptor is an inclusive bound, and therefore
one less than the size of the covered range.
Reviewed-by: Jason Andryuk <jason.andryuk@amd.com>
Tested-by: Jason Andryuk <jason.andryuk@amd.com>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
---
arch/x86/platform/pvh/head.S | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/platform/pvh/head.S b/arch/x86/platform/pvh/head.S
index ce4fd8d33da4..5a196fb3ebd8 100644
--- a/arch/x86/platform/pvh/head.S
+++ b/arch/x86/platform/pvh/head.S
@@ -224,7 +224,7 @@ SYM_CODE_END(pvh_start_xen)
.section ".init.data","aw"
.balign 8
SYM_DATA_START_LOCAL(gdt)
- .word gdt_end - gdt_start
+ .word gdt_end - gdt_start - 1
.long _pa(gdt_start) /* x86-64 will overwrite if relocated. */
.word 0
SYM_DATA_END(gdt)
--
2.46.1.824.gd892dcdcdd-goog
next prev parent reply other threads:[~2024-09-30 7:15 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-09-30 7:15 [PATCH v2 0/5] x86/xen: Drop absolute references from startup code Ard Biesheuvel
2024-09-30 7:15 ` [PATCH v2 1/5] x86/pvh: Call C code via the kernel virtual mapping Ard Biesheuvel
2024-09-30 7:15 ` Ard Biesheuvel [this message]
2024-09-30 7:15 ` [PATCH v2 3/5] x86/pvh: Omit needless clearing of phys_base Ard Biesheuvel
2024-09-30 7:15 ` [PATCH v2 4/5] x86/xen: Avoid relocatable quantities in Xen ELF notes Ard Biesheuvel
2024-10-02 21:25 ` Jason Andryuk
2024-10-03 7:49 ` Ard Biesheuvel
2024-09-30 7:15 ` [PATCH v2 5/5] x86/pvh: Avoid absolute symbol references in .head.text Ard Biesheuvel
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