linux-kernel - [PATCH 0/4 v5] fortify: Add Clang support

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Message-Id: <20220202003033.704951-1-keescook@chromium.org>
Date:   Tue,  1 Feb 2022 16:30:29 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     Miguel Ojeda <ojeda@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nathan Chancellor <nathan@...nel.org>,
        George Burgess IV <gbiv@...gle.com>,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev,
        linux-hardening@...r.kernel.org,
        linux-security-module@...r.kernel.org
Subject: [PATCH 0/4 v5] fortify: Add Clang support

Hi,

So, after looking at v4 at little longer I decided that it is just too
invasive. After spending time researching the primary issue that needed to
be worked around (__builtin_object_size(p, 1) not working from inlines),
I got some help from gbiv to use some Clang-specific attributes to get the
same effect.

I think the result is much less invasive, and it even lets us easily
expand size verification coverage into non-inlines if we ever want to.

Please take a look. :)

-Kees

v1: https://lore.kernel.org/linux-hardening/20210727205855.411487-61-keescook@chromium.org/
v2: https://lore.kernel.org/linux-hardening/20210818060533.3569517-64-keescook@chromium.org/
v3: https://lore.kernel.org/linux-hardening/20211213223331.135412-18-keescook@chromium.org/
v4: https://lore.kernel.org/linux-hardening/20220130182204.420775-1-keescook@chromium.org/
v5: - rewritten to use Clang attributes

Kees Cook (4):
  Compiler Attributes: Add Clang's __pass_object_size
  Compiler Attributes: Add __overloadable
  Compiler Attributes: Add __diagnose_as
  fortify: Add Clang support

 include/linux/compiler_attributes.h | 29 ++++++++++++++++
 include/linux/fortify-string.h      | 52 ++++++++++++++++++++---------
 security/Kconfig                    |  2 +-
 3 files changed, 67 insertions(+), 16 deletions(-)

-- 
2.30.2