From mboxrd@z Thu Jan 1 00:00:00 1970 From: rmk+kernel@arm.linux.org.uk (Russell King) Date: Fri, 03 Jun 2016 09:50:27 +0100 Subject: [PATCH 4/8] kexec: ensure user memory sizes do not wrap Message-ID: To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 Reviewed-by: Pratyush Anand Signed-off-by: Russell King --- 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