diff mbox series

[2/5] kernel: kexec: copy user-array safely

Message ID 0a3f1bca273792edbdc41b64c454a6f7f499c9a8.1693386602.git.pstanner@redhat.com (mailing list archive)
State Superseded
Headers show
Series Introduce new wrappers to copy user-arrays | expand

Commit Message

Philipp Stanner Aug. 30, 2023, 1:45 p.m. UTC 
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 mbox series

Patch

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);