Re: [PATCH v2 2/5] kernel: kexec: copy user-array safely

[Baoquan He]

On 09/08/23 at 09:59pm, Philipp Stanner wrote:
> 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>
> ---
>  kernel/kexec.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/kernel/kexec.c b/kernel/kexec.c
> index 107f355eac10..8f35a5a42af8 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]));

LGTM,

Acked-by: Baoquan He <bhe@xxxxxxxxxx>

>  	if (IS_ERR(ksegments))
>  		return PTR_ERR(ksegments);
>  
> -- 
> 2.41.0
> 
> 
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