linux-kernel - [PATCH 0/6] slab: Provide full coverage for __alloc

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Date:   Tue,  1 Nov 2022 15:33:08 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Vlastimil Babka <vbabka@...e.cz>
Cc:     Kees Cook <keescook@...omium.org>, David Gow <davidgow@...gle.com>,
        Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Hyeonggon Yoo <42.hyeyoo@...il.com>,
        Rasmus Villemoes <rasmus.villemoes@...vas.dk>,
        Guenter Roeck <linux@...ck-us.net>,
        Andy Shevchenko <andriy.shevchenko@...el.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, linux-hardening@...r.kernel.org,
        llvm@...ts.linux.dev
Subject: [PATCH 0/6] slab: Provide full coverage for __alloc_size attribute

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