Messages in this thread Patch in this message | | | From | Philipp Stanner <> | Subject | [PATCH 2/5] kernel: kexec: copy user-array safely | Date | Wed, 30 Aug 2023 15:45:53 +0200 |
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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> --- kernel/kexec.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/kexec.c b/kernel/kexec.c index 92d301f98776..f6067c1bb089 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); -- 2.41.0
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