Re: [PATCH v5] trace: acquire buffer from temparary trace sequence

[Linyu Yuan]

On 1/31/2023 3:30 AM, Steven Rostedt wrote:
> On Mon, 30 Jan 2023 21:14:01 +0800
> Linyu Yuan <quic_linyyuan@xxxxxxxxxxx> wrote:
>
> > @Steven current design is not safe, as user still can write to buffer
> > which have no enough space.
> I'm assuming that it would never use more that DWC3_MSG_MAX, and that's set
> to 500. The size of the trace_seq() is 4096 (or PAGE_SIZE), I doubt it will
> ever be an issue.
>
> How do you think the user can still write more than enough?


yes, agree it will be safe for dwc3, but i don't know if any possible 
hacker,

as the function always return a valid pointer even when hacker input a 
large size.


> -- Steve
>
> > do you think it is better to improve dwc3 trace in fast assign path ?