Hi Alec,
This looks good, thanks for fixing it.
On Thursday, 2022-10-13 at 22:13:44 +01, Alec Brown wrote:
> In the function grub_cryptodisk_endecrypt(), a for loop is incrementing the
> variable i by (1U << log_sector_size). The variable i is of type grub_size_t
> which is a 64-bit unsigned integer on x86_64 architecture. On the other hand,
> 1U
> is a 32-bit unsigned integer. By performing a left shift between these two
> values of different types, there may be potential for an integer overflow. To
> avoid this, we replace 1U with (grub_size_t) 1.
>
> Fixes: CID 307788
>
> Signed-off-by: Alec Brown <alec.r.br...@oracle.com>
Reviewed-by: Darren Kenny <darren.ke...@oracle.com>
Thanks,
Darren.
> ---
> grub-core/disk/cryptodisk.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/grub-core/disk/cryptodisk.c b/grub-core/disk/cryptodisk.c
> index 9f5dc7acb..cdcb882ca 100644
> --- a/grub-core/disk/cryptodisk.c
> +++ b/grub-core/disk/cryptodisk.c
> @@ -239,7 +239,7 @@ grub_cryptodisk_endecrypt (struct grub_cryptodisk *dev,
> return (do_encrypt ? grub_crypto_ecb_encrypt (dev->cipher, data, data,
> len)
> : grub_crypto_ecb_decrypt (dev->cipher, data, data, len));
>
> - for (i = 0; i < len; i += (1U << log_sector_size))
> + for (i = 0; i < len; i += ((grub_size_t) 1 << log_sector_size))
> {
> grub_size_t sz = ((dev->cipher->cipher->blocksize
> + sizeof (grub_uint32_t) - 1)
> --
> 2.27.0
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