linux-kernel - [tip: x86/kaslr] x86/kaslr: Fix off-by-one error in __process_mem

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Date:   Thu, 06 Aug 2020 23:39:00 -0000
From:   "tip-bot2 for Arvind Sankar" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Arvind Sankar <nivedita@...m.mit.edu>,
        Ingo Molnar <mingo@...nel.org>, x86 <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [tip: x86/kaslr] x86/kaslr: Fix off-by-one error in __process_mem_region()

The following commit has been merged into the x86/kaslr branch of tip:

Commit-ID:     8d1cf8595860f4807f4ff1f8f1fc53e7576e0d71
Gitweb:        https://git.kernel.org/tip/8d1cf8595860f4807f4ff1f8f1fc53e7576e0d71
Author:        Arvind Sankar <nivedita@...m.mit.edu>
AuthorDate:    Tue, 28 Jul 2020 18:57:06 -04:00
Committer:     Ingo Molnar <mingo@...nel.org>
CommitterDate: Fri, 31 Jul 2020 11:08:17 +02:00

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>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Link: https://lore.kernel.org/r/20200728225722.67457-6-nivedita@alum.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 da45e66..848346f 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;