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

[Linyu Yuan]

On 1/31/2023 10:37 AM, Steven Rostedt wrote:
> On Tue, 31 Jan 2023 10:06:22 +0800
> Linyu Yuan <quic_linyyuan@xxxxxxxxxxx> wrote:
>
> > 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.
> But gives a nice big warning if that's the case. This is not something that
> can be modified by user input. We do not need to worry about
> kernel implementations that could overflow (and trigger a WARN_ON() when
> they do). Especially since the max size is greater than the max size of the
> content of an event.
>
> A lot of systems that worry about hackers enable "panic_on_warn" which
> means that if the WARN_ON() triggers, the machine will crash, which will at
> most cause a DOS, but not something people can use to hack into the machine
> with.


thanks, please help review the change.


> -- Steve