Patch "kernel: kexec: copy user-array safely" has been added to the 6.6-stable tree

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This is a note to let you know that I've just added the patch titled

    kernel: kexec: copy user-array safely

to the 6.6-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     kernel-kexec-copy-user-array-safely.patch
and it can be found in the queue-6.6 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit a032b2e8a53cdef84d74e6f702d15ef40ac7caf5
Author: Philipp Stanner <pstanner@xxxxxxxxxx>
Date:   Wed Sep 20 14:36:10 2023 +0200

    kernel: kexec: copy user-array safely
    
    [ 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@xxxxxxxxxx>
    Signed-off-by: Philipp Stanner <pstanner@xxxxxxxxxx>
    Acked-by: Baoquan He <bhe@xxxxxxxxxx>
    Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx>
    Reviewed-by: Zack Rusin <zackr@xxxxxxxxxx>
    Signed-off-by: Dave Airlie <airlied@xxxxxxxxxx>
    Link: https://patchwork.freedesktop.org/patch/msgid/20230920123612.16914-4-pstanner@xxxxxxxxxx
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/kernel/kexec.c b/kernel/kexec.c
index 107f355eac101..8f35a5a42af85 100644
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -247,7 +247,7 @@ 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);
 



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