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Subject[PATCH v4 25/26] efi/x86: don't try to set page attributes on 0-sized regions.
From: Peter Jones <>

In "efi/x86: Explicitly set sections memory attributes", the following
region is defined to help compute page permissions:

/* .setup [image_base, _head] */
(unsigned long)_head - image_base,

In at least some cases, that will result in a size of 0, which will
produce an error and a message on the console, though no actual failure
will be caused in the boot process.

This patch checks that case in efi_adjust_memory_range_protection() and
returns the error without logging.

Signed-off-by: Peter Jones <>
drivers/firmware/efi/libstub/mem.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/firmware/efi/libstub/mem.c b/drivers/firmware/efi/libstub/mem.c
index b31d1975caa2..50a0b649b75a 100644
--- a/drivers/firmware/efi/libstub/mem.c
+++ b/drivers/firmware/efi/libstub/mem.c
@@ -249,6 +249,9 @@ efi_status_t efi_adjust_memory_range_protection(unsigned long start,
efi_physical_addr_t rounded_start, rounded_end;
unsigned long attr_clear;

+ if (size == 0)
* This function should not be used to modify attributes
* other than writable/executable.
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