linux-kernel - [PATCH v2 0/2] slab: Provide full coverage for __alloc

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Date:   Thu, 17 Nov 2022 19:51:57 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Vlastimil Babka <vbabka@...e.cz>
Cc:     Kees Cook <keescook@...omium.org>,
        Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Hyeonggon Yoo <42.hyeyoo@...il.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-hardening@...r.kernel.org
Subject: [PATCH v2 0/2] slab: Provide full coverage for __alloc_size attribute

Hi,

These patches 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(). The problem
was in two halves: the trace wrapper (now fixed in -next), and const-0
special-casing (covered here).

Thanks,

-Kees

v2:
- drop trace wrapper refactoring -- handled differently now (vbabka)
- drop kunit/fortify test patch since it depends on other changes
- rebase
v1: https://lore.kernel.org/all/20221101222520.never.109-kees@kernel.org

Kees Cook (2):
  slab: Clean up SLOB vs kmalloc() definition
  slab: Remove special-casing of const 0 size allocations

 include/linux/slab.h | 28 ++++++++++++++--------------
 1 file changed, 14 insertions(+), 14 deletions(-)

-- 
2.34.1