diff mbox series

[v5,27/27] efi/x86: don't try to set page attributes on 0-sized regions.

Message ID 465871c482bac0d996e81b5335fc6c307673517c.1678785672.git.baskov@ispras.ru
State New
Headers
Series x86_64: Improvements at compressed kernel stage |

Commit Message

Evgeniy Baskov March 14, 2023, 10:13 a.m. UTC 
  From: Peter Jones <pjones@redhat.com>

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

          /* .setup [image_base, _head] */
          efi_adjust_memory_range_protection(image_base,
                                             (unsigned long)_head - image_base,
                                             EFI_MEMORY_RO | EFI_MEMORY_XP);

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 <pjones@redhat.com>
---
 drivers/firmware/efi/libstub/mem.c | 3 +++
 1 file changed, 3 insertions(+)
diff mbox series

Patch

diff --git a/drivers/firmware/efi/libstub/mem.c b/drivers/firmware/efi/libstub/mem.c
index d58b552739ed..f18c797785ac 100644
--- a/drivers/firmware/efi/libstub/mem.c
+++ b/drivers/firmware/efi/libstub/mem.c
@@ -251,6 +251,9 @@  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)
+		return EFI_INVALID_PARAMETER;
+
 	/*
 	 * This function should not be used to modify attributes
 	 * other than writable/executable.