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From: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
To: David Malcolm <dmalcolm@redhat.com>
Cc: gcc-patches@gcc.gnu.org, linux-toolchains@vger.kernel.org
Subject: Re: [PATCH 0/6] RFC: adding support to GCC for detecting trust boundaries
Date: Sun, 14 Nov 2021 14:54:03 +0100	[thread overview]
Message-ID: <CANiq72nyyU_QSQkOFR1ARsB+7k=kqh2nTVyG8r-8YAagk5ex_Q@mail.gmail.com> (raw)
In-Reply-To: <20211113203732.2098220-1-dmalcolm@redhat.com>

On Sat, Nov 13, 2021 at 9:37 PM David Malcolm <dmalcolm@redhat.com> wrote:
>
>   #define __user __attribute__((untrusted))
>
> where my patched GCC treats
>   T *
> vs
>   T __attribute__((untrusted)) *
> as being different types and thus the C frontend can complain (even without
> -fanalyzer) about e.g.:

This one sounds similar to the `Untrusted<T>` wrapper I suggested for
the Rust side -- we would have a method to "extract and trust" the
value (instead of a cast).

> Patch 2 in the kit adds:
>   __attribute__((returns_zero_on_success))
> and
>   __attribute__((returns_nonzero_on_success))
> as hints to the analyzer that it's worth bifurcating the analysis of
> such functions (to explore failure vs success, and thus to better
> explore error-handling paths).  It's also a hint to the human reader of
> the source code.

These two sound quite nice to have for most C projects. Would it be
useful to generalize to different values than 0/non-0? e.g.
`returns_on_success(0)` and `returns_on_failure(0)`.

Cheers,
Miguel

  parent reply	other threads:[~2021-11-14 13:54 UTC|newest]

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-13 20:37 [PATCH 0/6] RFC: adding support to GCC for detecting trust boundaries David Malcolm
2021-11-13 20:37 ` [PATCH 1a/6] RFC: Implement "#pragma GCC custom_address_space" David Malcolm
2021-11-13 20:37 ` [PATCH 1b/6] Add __attribute__((untrusted)) David Malcolm
2021-12-09 22:54   ` Martin Sebor
2022-01-06 15:10     ` David Malcolm
2022-01-06 18:59       ` Martin Sebor
2021-11-13 20:37 ` [PATCH 2/6] Add returns_zero_on_success/failure attributes David Malcolm
2021-11-15  7:03   ` Prathamesh Kulkarni
2021-11-15 14:45     ` Peter Zijlstra
2021-11-15 22:30       ` David Malcolm
2021-11-15 22:12     ` David Malcolm
2021-11-17  9:23       ` Prathamesh Kulkarni
2021-11-17 22:43         ` Joseph Myers
2021-11-18 20:08           ` Segher Boessenkool
2021-11-18 23:45             ` David Malcolm
2021-11-19 21:52               ` Segher Boessenkool
2021-11-18 23:34           ` David Malcolm
2021-12-06 18:34             ` Martin Sebor
2021-11-18 23:15         ` David Malcolm
2021-11-13 20:37 ` [PATCH 4a/6] analyzer: implement region::untrusted_p in terms of custom address spaces David Malcolm
2021-11-13 20:37 ` [PATCH 4b/6] analyzer: implement region::untrusted_p in terms of __attribute__((untrusted)) David Malcolm
2021-11-13 20:37 ` [PATCH 5/6] analyzer: use region::untrusted_p in taint detection David Malcolm
2021-11-13 20:37 ` [PATCH 6/6] Add __attribute__ ((tainted)) David Malcolm
2022-01-06 14:08   ` PING (C/C++): " David Malcolm
2022-01-10 21:36     ` PING^2 " David Malcolm
2022-01-12  4:36       ` Jason Merrill
2022-01-12 15:33         ` David Malcolm
2022-01-13 19:08           ` Jason Merrill
2022-01-14  1:25             ` [committed] Add __attribute__ ((tainted_args)) David Malcolm
2021-11-13 23:20 ` [PATCH 0/6] RFC: adding support to GCC for detecting trust boundaries Peter Zijlstra
2021-11-14  2:54   ` David Malcolm
2021-11-14 13:54 ` Miguel Ojeda [this message]
2021-12-06 18:12 ` Martin Sebor
2021-12-06 19:40   ` Segher Boessenkool
2021-12-09  0:06     ` David Malcolm
2021-12-09  0:41       ` Segher Boessenkool
2021-12-09 16:42     ` Martin Sebor
2021-12-09 23:40       ` Segher Boessenkool
2021-12-08 23:11   ` David Malcolm

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