linux-kernel - Re: [PATCH 00/13] [RFC] Rust support

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Message-ID: <20210416180829.GO2531743@casper.infradead.org>
Date:   Fri, 16 Apr 2021 19:08:29 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
        Willy Tarreau <w@....eu>,
        Wedson Almeida Filho <wedsonaf@...gle.com>,
        Miguel Ojeda <ojeda@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        rust-for-linux@...r.kernel.org,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Linux Doc Mailing List <linux-doc@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 00/13] [RFC] Rust support

On Fri, Apr 16, 2021 at 07:18:48PM +0200, Peter Zijlstra wrote:
> On Fri, Apr 16, 2021 at 07:10:17PM +0200, Miguel Ojeda wrote:
> 
> > Of course, UB is only a subset of errors, but it is a major one, and
> > particularly critical for privileged code.
> 
> I've seen relatively few UBSAN warnings that weren't due to UBSAN being
> broken.

Lucky you.

84c34df158cf215b0cd1475ab3b8e6f212f81f23

(i'd argue this is C being broken; promoting only as far as int, when
assigning to an unsigned long is Bad, but until/unless either GCC fixes
that or the language committee realises that being stuck in the 1970s
is Bad, people are going to keep making this kind of mistake)