From: Masami Hiramatsu (Google) <mhiramat@kernel.org>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: Josh Law <objecting@objecting.org>,
Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org
Subject: Re: [PATCH v4] lib/bootconfig: guard xbc_node_compose_key_after() buffer size
Date: Wed, 18 Mar 2026 12:07:22 +0900 [thread overview]
Message-ID: <20260318120722.322e08498074da62a9d04503@kernel.org> (raw)
In-Reply-To: <20260317204327.3c61d0ea@robin>
On Tue, 17 Mar 2026 20:43:27 -0400
Steven Rostedt <rostedt@goodmis.org> wrote:
> On Wed, 18 Mar 2026 09:02:43 +0900
> Masami Hiramatsu (Google) <mhiramat@kernel.org> wrote:
>
> > Yes, that is checked in vsnprintf(), not its caller.
> > I think linux kernel should ensure the the return value is smaller
> > than INT_MAX, and return -EOVERFLOW if not.
>
> Well, there's very few places that could have a buffer size of > 2G.
>
> What's the max bootconfig limit? Could you create a bootconfig that is
> greater than 2G?
It's just 32KB. So we don't need it.
Anyway, I sent a patch about that.
https://lore.kernel.org/all/177379678638.535490.18200744206158553364.stgit@devnote2/
Thank you,
>
> If not, then yeah, we shouldn't really care about overflows (and that
> includes not worrying about typecasting the size variable to int).
>
> -- Steve
>
--
Masami Hiramatsu (Google) <mhiramat@kernel.org>
next prev parent reply other threads:[~2026-03-18 3:07 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-17 20:44 [PATCH v4] lib/bootconfig: guard xbc_node_compose_key_after() buffer size Josh Law
2026-03-17 23:03 ` Masami Hiramatsu
2026-03-17 23:16 ` Steven Rostedt
2026-03-18 0:02 ` Masami Hiramatsu
2026-03-18 0:43 ` Steven Rostedt
2026-03-18 3:07 ` Masami Hiramatsu [this message]
2026-03-18 13:45 ` Steven Rostedt
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