linux-kernel - [PATCH v2 3/8] x86/kaslr: Fix process_efi

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Message-Id: <20200727230801.3468620-4-nivedita@alum.mit.edu>
Date:   Mon, 27 Jul 2020 19:07:56 -0400
From:   Arvind Sankar <nivedita@...m.mit.edu>
To:     Kees Cook <keescook@...omium.org>, x86@...nel.org
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH v2 3/8] x86/kaslr: Fix process_efi_entries comment

Since commit
  0982adc74673 ("x86/boot/KASLR: Work around firmware bugs by excluding EFI_BOOT_SERVICES_* and EFI_LOADER_* from KASLR's choice")
process_efi_entries will return true if we have an EFI memmap, not just
if it contained EFI_MEMORY_MORE_RELIABLE regions.

Signed-off-by: Arvind Sankar <nivedita@...m.mit.edu>
---
 arch/x86/boot/compressed/kaslr.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/boot/compressed/kaslr.c b/arch/x86/boot/compressed/kaslr.c
index 21cd9e07f1f6..207fcb7e7b71 100644
--- a/arch/x86/boot/compressed/kaslr.c
+++ b/arch/x86/boot/compressed/kaslr.c
@@ -741,8 +741,8 @@ static bool process_mem_region(struct mem_vector *region,
 
 #ifdef CONFIG_EFI
 /*
- * Returns true if mirror region found (and must have been processed
- * for slots adding)
+ * Returns true if we processed the EFI memmap, which we prefer over the E820
+ * table if it is available.
  */
 static bool
 process_efi_entries(unsigned long minimum, unsigned long image_size)
-- 
2.26.2