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[PATCH] x86/setup: correct off-by-1 in module mapping
- To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 19 Mar 2025 12:21:53 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Daniel Smith <dpsmith@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Wed, 19 Mar 2025 11:21:59 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
If a module's length is an exact multiple of PAGE_SIZE, the 2nd argument
passed to set_pdx_range() would be one larger than intended. Use
PFN_{UP,DOWN}() there instead.
Fixes: cd7cc5320bb2 ("x86/boot: add start and size fields to struct
boot_module")
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
--- a/xen/arch/x86/setup.c
+++ b/xen/arch/x86/setup.c
@@ -1730,7 +1730,7 @@ void asmlinkage __init noreturn __start_
{
unsigned long s = bi->mods[i].start, l = bi->mods[i].size;
- set_pdx_range(paddr_to_pfn(s), paddr_to_pfn(s + l) + 1);
+ set_pdx_range(PFN_DOWN(s), PFN_UP(s + l));
map_pages_to_xen((unsigned long)maddr_to_virt(s), maddr_to_mfn(s),
PFN_UP(l), PAGE_HYPERVISOR);
}
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