Re: [PATCH 30/82] s390/kexec_file: Refactor intentional wrap-around calculation

[Sven Schnelle]

Alexander Gordeev <agordeev@xxxxxxxxxxxxx> writes:

> On Mon, Jan 22, 2024 at 04:27:05PM -0800, Kees Cook wrote:
>> diff --git a/arch/s390/kernel/machine_kexec_file.c b/arch/s390/kernel/machine_kexec_file.c
>> index 8d207b82d9fe..e5e925423061 100644
>> --- a/arch/s390/kernel/machine_kexec_file.c
>> +++ b/arch/s390/kernel/machine_kexec_file.c
>> @@ -238,6 +238,7 @@ void *kexec_file_add_components(struct kimage *image,
>>  	unsigned long max_command_line_size = LEGACY_COMMAND_LINE_SIZE;
>>  	struct s390_load_data data = {0};
>>  	unsigned long minsize;
>> +	unsigned long sum;
>
> Please, use min_kernel_buf_len instead of sum.
>
> @Sven, could you please correct me if (minsize + max_command_line_size)
> means something else.

Your understanding is correct, minsize + max_command_line_size is the
minimum required size of the kernel image.