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[PATCH v2 1/5] x86/HVM: correct MMIO emulation cache bounds check
- To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 1 Oct 2024 10:48:20 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Tue, 01 Oct 2024 08:48:24 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
To avoid overrunning the internal buffer we need to take the offset into
the buffer into account.
Fixes: d95da91fb497 ("x86/HVM: grow MMIO cache data size to 64 bytes")
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
---
v2: New.
--- a/xen/arch/x86/hvm/emulate.c
+++ b/xen/arch/x86/hvm/emulate.c
@@ -935,7 +935,7 @@ static int hvmemul_phys_mmio_access(
}
/* Accesses must not overflow the cache's buffer. */
- if ( size > sizeof(cache->buffer) )
+ if ( offset + size > sizeof(cache->buffer) )
{
ASSERT_UNREACHABLE();
return X86EMUL_UNHANDLEABLE;
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