linux-kernel - Re: [PATCH v3 1/5] tracepoints: Add verifier that makes sure all defined tracepoints are used

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAHk-=wihb6KVgU__zfhdHR=-Mqhp6qaAABdu31CJ2ML6MDj0dw@mail.gmail.com>
Date: Tue, 22 Jul 2025 09:16:49 -0700
From: Linus Torvalds <torvalds@...ux-foundation.org>
To: Steven Rostedt <rostedt@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org, 
	linux-kbuild@...r.kernel.org, llvm@...ts.linux.dev, 
	Masami Hiramatsu <mhiramat@...nel.org>, Mark Rutland <mark.rutland@....com>, 
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, Andrew Morton <akpm@...ux-foundation.org>, 
	Arnd Bergmann <arnd@...db.de>, Masahiro Yamada <masahiroy@...nel.org>, 
	Nathan Chancellor <nathan@...nel.org>, Nicolas Schier <nicolas.schier@...ux.dev>, 
	Nick Desaulniers <nick.desaulniers+lkml@...il.com>, Catalin Marinas <catalin.marinas@....com>
Subject: Re: [PATCH v3 1/5] tracepoints: Add verifier that makes sure all
 defined tracepoints are used

On Tue, 22 Jul 2025 at 08:21, Steven Rostedt <rostedt@...nel.org> wrote:
>
> Add a verifier that injects a pointer to the tracepoint structure in the
> functions that are used and added to a section called __tracepoint_check.
> Then on boot up, iterate over this section and for every tracepoint
> descriptor that is pointed to, update its ".funcs" field to (void *)1, as
> the .funcs field is only set when a tracepoint is registered. At this
> time, no tracepoints should be registered.

Why?

Doing this at runtime seems completely bass-ackwards.

If you want to do this verification, why don't you do it at build-time?

            Linus