[Xen-devel] [PATCH 2/6] EFI: don't leak heap contents through XEN_EFI_get_next_variable_name

[Jan Beulich <jbeulich@xxxxxxxx>]

Commit 1f4eb9d27d0e ("EFI: fix getting EFI variable list on some
systems") switched to using the caller provided size for the copy-out
without making sure the copied buffer is properly scrubbed.

Reported-by: Ilja Van Sprundel <ivansprundel@xxxxxxxxxxxx>
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Reviewed-by: George Dunlap <george.dunlap@xxxxxxxxxx>

--- a/xen/common/efi/runtime.c
+++ b/xen/common/efi/runtime.c
@@ -571,7 +571,7 @@ int efi_runtime_call(struct xenpf_efi_ru
             return -EINVAL;
 
         size = op->u.get_next_variable_name.size;
-        name.raw = xmalloc_bytes(size);
+        name.raw = xzalloc_bytes(size);
         if ( !name.raw )
             return -ENOMEM;
         if ( copy_from_guest(name.raw, op->u.get_next_variable_name.name,


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