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From: Siddhesh Poyarekar <siddhesh@gotplt.org>
To: Kees Cook <keescook@chromium.org>
Cc: linux-hardening@vger.kernel.org,
	Nathan Chancellor <nathan@kernel.org>,
	Nick Desaulniers <ndesaulniers@google.com>,
	Arnd Bergmann <arnd@arndb.de>, Juergen Gross <jgross@suse.com>,
	Boris Ostrovsky <boris.ostrovsky@oracle.com>,
	Tom Rix <trix@redhat.com>, Miguel Ojeda <ojeda@kernel.org>,
	linux-kernel@vger.kernel.org, llvm@lists.linux.dev
Subject: Re: [PATCH 0/4] fortify: Use __builtin_dynamic_object_size() when available
Date: Thu, 22 Sep 2022 20:55:01 -0400	[thread overview]
Message-ID: <760dbc4d-625b-ca31-ab89-a7d44a68483b@gotplt.org> (raw)
In-Reply-To: <202209221714.1D792FE6@keescook>

On 2022-09-22 20:20, Kees Cook wrote:
> Yeah, this could be another interest set of additions. It seems like it
> might be more "coder friendly" if, in the future that has the
> __element_count__ attribute, it could be used in function parameters
> too, like:
> 
> If we had:
> 
> int do_something(struct context *ctx, u32 *data, int count)
> 
> this seems less easy to read to me:
> 
> int __access(read_write, 2, 3) do_something(struct context *ctx, u32 *data, int count)
> 
> as this seems more readable to me, though I guess the access-mode
> information is lost:
> 
> int do_something(struct context *ctx, u32 * __element_count(count) data, int count)

It doesn't *have* to lose access mode info:

int do_something(struct context *ctx,
		 u32 * __element_count(count, __read_only__) data,
		 int count)
{
...
}

where omitting the access mode could imply __read_write__.

Thanks,
Sid

      reply	other threads:[~2022-09-23  0:55 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-09-20 19:21 [PATCH 0/4] fortify: Use __builtin_dynamic_object_size() when available Kees Cook
2022-09-20 19:21 ` [PATCH 1/4] x86/entry: Work around Clang __bdos() bug Kees Cook
2022-09-21  0:07   ` Boris Ostrovsky
2022-09-20 19:22 ` [PATCH 2/4] fortify: Explicitly check bounds are compile-time constants Kees Cook
2022-09-21 11:48   ` Siddhesh Poyarekar
2022-09-22  3:46     ` Kees Cook
2022-09-20 19:22 ` [PATCH 3/4] fortify: Convert to struct vs member helpers Kees Cook
2022-09-20 19:22 ` [PATCH 4/4] fortify: Use __builtin_dynamic_object_size() when available Kees Cook
2022-09-21 11:24   ` Miguel Ojeda
2022-09-21 11:43   ` Siddhesh Poyarekar
2022-09-22  3:33     ` Kees Cook
2022-09-22 14:45       ` Siddhesh Poyarekar
2022-11-22 10:20   ` Siddhesh Poyarekar
2022-11-23  5:15     ` Kees Cook
2022-11-23 15:29       ` Siddhesh Poyarekar
2023-01-13 15:59   ` linux-next - bxnt buffer overflow in strnlen Niklas Cassel
2023-01-13 16:08     ` linux-next - bnxt " Niklas Cassel
2023-01-13 22:44       ` Kees Cook
2023-01-16 10:56         ` Niklas Cassel
2022-09-22 20:26 ` [PATCH 0/4] fortify: Use __builtin_dynamic_object_size() when available Siddhesh Poyarekar
2022-09-23  0:20   ` Kees Cook
2022-09-23  0:55     ` Siddhesh Poyarekar [this message]

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