Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
From:   Kees Cook <keescook@chromium.org>
To:     Vlastimil Babka <vbabka@suse.cz>
Cc:     Kees Cook <keescook@chromium.org>, David Gow <davidgow@google.com>,
        Christoph Lameter <cl@linux.com>,
        Pekka Enberg <penberg@kernel.org>,
        David Rientjes <rientjes@google.com>,
        Joonsoo Kim <iamjoonsoo.kim@lge.com>,
        Roman Gushchin <roman.gushchin@linux.dev>,
        Hyeonggon Yoo <42.hyeyoo@gmail.com>,
        Rasmus Villemoes <rasmus.villemoes@prevas.dk>,
        Guenter Roeck <linux@roeck-us.net>,
        Andy Shevchenko <andriy.shevchenko@intel.com>,
        Paolo Abeni <pabeni@redhat.com>,
        Geert Uytterhoeven <geert@linux-m68k.org>,
        Nathan Chancellor <nathan@kernel.org>,
        Nick Desaulniers <ndesaulniers@google.com>,
        Tom Rix <trix@redhat.com>, linux-kernel@vger.kernel.org,
        linux-mm@kvack.org, linux-hardening@vger.kernel.org,
        llvm@lists.linux.dev
Subject: [PATCH 0/6] slab: Provide full coverage for __alloc_size attribute
Date:   Tue,  1 Nov 2022 15:33:08 -0700
Message-Id: <20221101222520.never.109-kees@kernel.org>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

Hi,

This is a series to work around a deficiency in GCC (>=11) and Clang
(<16) where the __alloc_size attribute does not apply to inlines. :(
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96503

This manifests as reduced overflow detection coverage for many allocation
sites under CONFIG_FORTIFY_SOURCE=y, where the allocation size was
not actually being propagated to __builtin_dynamic_object_size(). In
addition to working around the issue, expand use of __alloc_size (and
__realloc_size) to more places and provide KUnit tests to validate all
the covered allocator APIs.

-Kees

Kees Cook (6):
  slab: Clean up SLOB vs kmalloc() definition
  slab: Remove special-casing of const 0 size allocations
  slab: Provide functional __alloc_size() hints to kmalloc_trace*()
  string: Add __realloc_size hint to kmemdup()
  driver core: Add __alloc_size hint to devm allocators
  kunit/fortify: Validate __alloc_size attribute results

 include/linux/device.h         |   7 +-
 include/linux/fortify-string.h |   2 +-
 include/linux/slab.h           |  36 ++---
 include/linux/string.h         |   2 +-
 lib/Makefile                   |   1 +
 lib/fortify_kunit.c            | 255 +++++++++++++++++++++++++++++++++
 mm/slab_common.c               |  14 ++
 7 files changed, 296 insertions(+), 21 deletions(-)

-- 
2.34.1