Re: [PATCH -mm] Don't truncate /proc/PID/environ at 4096 characters

[James Pearson <james-p@moving-picture.com>]

Arvin Moezzi wrote:

> I think that's not true. 'count' is changing through the iteration.
> The difference in the mem_read():
>
> * while (count > 0) {
> *     int this_len, retval;
> *
> *      this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
> *      retval = access_process_vm(task, src, page, this_len, 0);
> *
> *      ...
> * }
>
> is the fact, that this_len = min(PAGE_SIZE, count) is in the
> iteration block, hence retval <= this_len <= count in each iteration
> step. So this is ok. But IMHO in your code 'retval' may be bigger than
> 'count' in the last iteration of the block, because 'max_len' is fix
> through your iteration but 'count' is changing. Or am i missing
> something?

Yes, you are correct ...

Thanks

James Pearson
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/