linux-hardening - [PATCH 0/4] fortify: Use __builtin_dynamic_object

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Date:   Tue, 20 Sep 2022 12:21:58 -0700
From:   Kees Cook <keescook@...omium.org>
To:     linux-hardening@...r.kernel.org
Cc:     Kees Cook <keescook@...omium.org>,
        Siddhesh Poyarekar <siddhesh@...plt.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Arnd Bergmann <arnd@...db.de>, Juergen Gross <jgross@...e.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Tom Rix <trix@...hat.com>, Miguel Ojeda <ojeda@...nel.org>,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev
Subject: [PATCH 0/4] fortify: Use __builtin_dynamic_object_size() when available

Hi,

This adjusts CONFIG_FORTIFY_SOURCE's coverage to include greater runtime
size checking from GCC and Clang's __builtin_dynamic_object_size(), which
the compilers can track either via code flow or from __alloc_size() hints.

Thanks,

-Kees

Kees Cook (4):
  x86/entry: Work around Clang __bdos() bug
  fortify: Explicitly check bounds are compile-time constants
  fortify: Convert to struct vs member helpers
  fortify: Use __builtin_dynamic_object_size() when available

 arch/x86/xen/enlighten_pv.c         |   3 +-
 drivers/misc/lkdtm/heap.c           |   1 +
 include/linux/compiler_attributes.h |   5 ++
 include/linux/fortify-string.h      | 125 ++++++++++++++++------------
 4 files changed, 81 insertions(+), 53 deletions(-)

-- 
2.34.1