* [PATCH 4/8] kexec: ensure user memory sizes do not wrap
@ 2016-06-03 8:50 Russell King
0 siblings, 0 replies; only message in thread
From: Russell King @ 2016-06-03 8:50 UTC (permalink / raw)
To: linux-arm-kernel
Ensure that user memory sizes do not wrap around when validating the
user input, which can lead to the following input validation working
incorrectly.
Acked-by: Baoquan He <bhe@redhat.com>
Reviewed-by: Pratyush Anand <panand@redhat.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---
kernel/kexec_core.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/kernel/kexec_core.c b/kernel/kexec_core.c
index 8d34308ea449..d719a4d0ef55 100644
--- a/kernel/kexec_core.c
+++ b/kernel/kexec_core.c
@@ -169,6 +169,8 @@ int sanity_check_segment_list(struct kimage *image)
mstart = image->segment[i].mem;
mend = mstart + image->segment[i].memsz;
+ if (mstart > mend)
+ return result;
if ((mstart & ~PAGE_MASK) || (mend & ~PAGE_MASK))
return result;
if (mend >= KEXEC_DESTINATION_MEMORY_LIMIT)
--
2.1.0
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