From: Philipp Stanner pstanner@redhat.com
[ Upstream commit 569c8d82f95eb5993c84fb61a649a9c4ddd208b3 ]
Currently, there is no overflow-check with memdup_user().
Use the new function memdup_array_user() instead of memdup_user() for duplicating the user-space array safely.
Suggested-by: David Airlie airlied@redhat.com Signed-off-by: Philipp Stanner pstanner@redhat.com Acked-by: Baoquan He bhe@redhat.com Reviewed-by: Kees Cook keescook@chromium.org Reviewed-by: Zack Rusin zackr@vmware.com Signed-off-by: Dave Airlie airlied@redhat.com Link: https://patchwork.freedesktop.org/patch/msgid/20230920123612.16914-4-pstanne... Signed-off-by: Sasha Levin sashal@kernel.org --- kernel/kexec.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/kexec.c b/kernel/kexec.c index 92d301f987766..f6067c1bb0893 100644 --- a/kernel/kexec.c +++ b/kernel/kexec.c @@ -242,7 +242,7 @@ SYSCALL_DEFINE4(kexec_load, unsigned long, entry, unsigned long, nr_segments, ((flags & KEXEC_ARCH_MASK) != KEXEC_ARCH_DEFAULT)) return -EINVAL;
- ksegments = memdup_user(segments, nr_segments * sizeof(ksegments[0])); + ksegments = memdup_array_user(segments, nr_segments, sizeof(ksegments[0])); if (IS_ERR(ksegments)) return PTR_ERR(ksegments);