lkml.org 
[lkml]   [2020]   [Aug]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
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@alum.mit.edu>
AuthorDate: Tue, 28 Jul 2020 18:57:06 -04:00
Committer: Ingo Molnar <mingo@kernel.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@alum.mit.edu>
Signed-off-by: Ingo Molnar <mingo@kernel.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;
\
 
 \ /
  Last update: 2020-08-07 01:40    [W:0.165 / U:0.548 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site