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Message-ID: <ZMbqBfEI9CuT0FUe@boqun-archlinux>
Date: Sun, 30 Jul 2023 15:53:57 -0700
From: Boqun Feng <boqun.feng@...il.com>
To: Björn Roy Baron <bjorn3_gh@...tonmail.com>
Cc: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-mm@...ck.org, Miguel Ojeda <ojeda@...nel.org>,
Alex Gaynor <alex.gaynor@...il.com>,
Wedson Almeida Filho <wedsonaf@...il.com>,
Gary Guo <gary@...yguo.net>,
Benno Lossin <benno.lossin@...ton.me>,
Martin Rodriguez Reboredo <yakoyoku@...il.com>,
Alice Ryhl <aliceryhl@...gle.com>,
Dariusz Sosnowski <dsosnowski@...snowski.pl>,
Geoffrey Thomas <geofft@...reload.com>,
Fox Chen <foxhlchen@...il.com>,
John Baublitz <john.m.baublitz@...il.com>,
Christoph Lameter <cl@...ux.com>,
Pekka Enberg <penberg@...nel.org>,
David Rientjes <rientjes@...gle.com>,
Joonsoo Kim <iamjoonsoo.kim@....com>,
Andrew Morton <akpm@...ux-foundation.org>,
Vlastimil Babka <vbabka@...e.cz>,
Roman Gushchin <roman.gushchin@...ux.dev>,
Hyeonggon Yoo <42.hyeyoo@...il.com>,
Kees Cook <keescook@...omium.org>, stable@...r.kernel.org,
Andreas Hindborg <nmi@...aspace.dk>
Subject: Re: [PATCH 1/3] rust: allocator: Prevent mis-aligned allocation
On Sun, Jul 30, 2023 at 10:41:54PM +0000, Björn Roy Baron wrote:
> On Jul 30, 2023, 10:43 PM, Miguel Ojeda < miguel.ojeda.sandonis@...il.com> wrote:
> > On Sun, Jul 30, 2023 at 3:29 AM Boqun > Feng <boqun.feng@...il.com> wrote:
> > >
> > > +// Note: Although these are *safe* functions, but they are only generated at
> > > +// `GlobalAlloc` callsites, hence we assume the parameters obey the same
> > > +// `GlobalAlloc` function safety requirements: size and align should form a
> > > +// valid layout, and size is greater than 0.
> >
> > Thanks for adding all the `// SAFETY` comments here Boqun!
> >
> > Björn, do they look good to you? (since you fixed the issue in the compiler)
>
> Based on a quick look, yes. The __rust_* methods that are normally generated by the compiled directly jump to the respective global allocator method, so they have the same safety requirements.
>
Good to know, thanks!
> >
> > On this comment in particular, "generated at `GlobalAlloc` callsites"
> sounds a bit confusing to me. Would "... called by the compiler with
> parameters that obey ..." make sense? Or does the sentence refer to
Agreed. It's better. So reword as below:
// Note: Although these are *safe* functions, but they are called by the
// compiler with the parameters that obey the same `GlobalAlloc`
// function safety requirements: size and align should form a valid
// layout, and size is greater than 0.
Regards,
Boqun
> the normal case (i.e. when the functions are generated)? Anyway, it is
> not a big deal.
> >
> > Cheers,
> > Miguel
>
> Cheers,
> Björn
>
> (resent as I accidentally sent html instead of plain text)
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