linux-kernel - [PATCH v3 05/21] x86/kaslr: Fix off-by-one error in __process_mem

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Message-Id: <20200728225722.67457-6-nivedita@alum.mit.edu>
Date:   Tue, 28 Jul 2020 18:57:06 -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 v3 05/21] x86/kaslr: Fix off-by-one error in __process_mem_region

In case of an overlap, the beginning of the region should be used even
if it is exactly image_size, not just strictly larger.

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

diff --git a/arch/x86/boot/compressed/kaslr.c b/arch/x86/boot/compressed/kaslr.c
index da45e66cb6e4..848346fc0dbb 100644
--- a/arch/x86/boot/compressed/kaslr.c
+++ b/arch/x86/boot/compressed/kaslr.c
@@ -669,7 +669,7 @@ static void __process_mem_region(struct mem_vector *entry,
 		}
 
 		/* Store beginning of region if holds at least image_size. */
-		if (overlap.start > region.start + image_size) {
+		if (overlap.start >= region.start + image_size) {
 			struct mem_vector beginning;
 
 			beginning.start = region.start;
-- 
2.26.2