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[PATCH 01/15] x86/EFI: guard against oversized modules
- To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 12 Oct 2026 10:19:07 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Teddy Astie <teddy.astie@xxxxxxxxxx>, Roger Pau Monné <roger@xxxxxxxxxxxxxx>, Marek Marczykowski <marmarek@xxxxxxxxxxxxxxxxxxxxxx>, Daniel Smith <dpsmith@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Mon, 12 Oct 2026 08:19:13 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
x86/EFI: guard against oversized modules
module_t's mod_end field (which we repurpose to hold a module's size)
cannot hold values 4Gb and up. Don't let truncation go silently.
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
---
MB and MB2 also constrain module to below 4Gb. The constraint here may be
possible to drop once hyperlaunch work has progressed enough to no longer
require the intermediate mb_modules[].
--- a/xen/arch/x86/efi/efi-boot.h
+++ b/xen/arch/x86/efi/efi-boot.h
@@ -736,6 +736,13 @@ static void __init efi_arch_handle_modul
place_string(&mb_modules[mbi.mods_count].string, local_name.s);
mb_modules[mbi.mods_count].mod_start = file->addr >> PAGE_SHIFT;
mb_modules[mbi.mods_count].mod_end = file->size;
+
+ if ( mb_modules[mbi.mods_count].mod_end != file->size )
+ {
+ PrintStr(name);
+ blexit(L" is too large");
+ }
+
++mbi.mods_count;
efi_bs->FreePool(ptr);
}
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