On 06/23, Kees Cook wrote:
>
> @@ -956,7 +957,15 @@ void set_task_comm(struct task_struct *tsk, char *buf)
> */
> memset(tsk->comm, 0, TASK_COMM_LEN);
> wmb();
Off-topic. I'd wish I could understand this barrier. Since the lockless
reader doesn't do rmb() I don't see how this can help. OTOH, I don't
understand why it is needed, we never change ->comm[TASK_COMM_LEN-1] == '0'.
> - strlcpy(tsk->comm, buf, sizeof(tsk->comm));
> +
> + /* sanitize non-printable characters */
> + for (i = 0; buf[i] && i < (sizeof(tsk->comm) - 1); i++) {
> + if (!isprint(buf[i]))
> + tsk->comm[i] = '?';
> + else
> + tsk->comm[i] = buf[i];
> + }
Personally I think this makes sense.
> -extern char *get_task_comm(char *to, struct task_struct *tsk);
> +#define get_task_comm(buf, task) get_task_comm_size(buf, sizeof(buf), task)
> +extern char *get_task_comm_size(char *to, size_t len, struct task_struct *tsk);
Oh, but this means that get_task_comm(ptr, task) doesn't work?
Oleg.
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