linux-hardening - [PATCH v3 0/8] Add __alloc

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Date:   Thu, 30 Sep 2021 15:26:56 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Kees Cook <keescook@...omium.org>, Joe Perches <joe@...ches.com>,
        Miguel Ojeda <ojeda@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Andy Whitcroft <apw@...onical.com>,
        Dwaipayan Ray <dwaipayanray1@...il.com>,
        Lukas Bulwahn <lukas.bulwahn@...il.com>,
        Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Daniel Micay <danielmicay@...il.com>,
        Dennis Zhou <dennis@...nel.org>, Tejun Heo <tj@...nel.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        clang-built-linux@...glegroups.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org,
        linux-hardening@...r.kernel.org
Subject: [PATCH v3 0/8] Add __alloc_size()

Hi Andrew,

This is a refresh of the __alloc_size series you have in -mm
currently. This addresses the issues[1] Linus had with attribute
location and the redundant use of __malloc. These are meant to replace
the following patches:

compiler-attributes-add-__alloc_size-for-better-bounds-checking.patch
compiler-attributes-add-__alloc_size-for-better-bounds-checking-fix.patch
checkpatch-add-__alloc_size-to-known-attribute.patch
slab-clean-up-function-declarations.patch
slab-add-__alloc_size-attributes-for-better-bounds-checking.patch
mm-page_alloc-add-__alloc_size-attributes-for-better-bounds-checking.patch
percpu-add-__alloc_size-attributes-for-better-bounds-checking.patch
mm-vmalloc-add-__alloc_size-attributes-for-better-bounds-checking.patch
rapidio-avoid-bogus-__alloc_size-warning.patch

Thanks!

-Kees

[1] https://lore.kernel.org/mm-commits/CAHk-=wgfbSyW6QYd5rmhSHRoOQ=ZvV+jLn1U8U4nBDgBuaOAjQ@mail.gmail.com/

v3:
- move attribute logic around to better handle GCC's weird behavior
- merge __malloc into the __alloc_size macro (Linus)
- refactor attribute positions (Linus)
v2: https://lore.kernel.org/lkml/20210818214021.2476230-1-keescook@chromium.org
v1: https://lore.kernel.org/lkml/20210818050841.2226600-1-keescook@chromium.org

Original cover letter:

GCC and Clang both use the "alloc_size" attribute to assist with bounds
checking around the use of allocation functions. Add the attribute,
adjust the Makefile to silence needless warnings, and add the hints to
the allocators where possible. These changes have been in use for a
while now in GrapheneOS.

Kees Cook (8):
  rapidio: Avoid bogus __alloc_size warning
  Compiler Attributes: add __alloc_size() for better bounds checking
  slab: Clean up function prototypes
  slab: Add __alloc_size attributes for better bounds checking
  mm/kvmalloc: Add __alloc_size attributes for better bounds checking
  mm/vmalloc: Add __alloc_size attributes for better bounds checking
  mm/page_alloc: Add __alloc_size attributes for better bounds checking
  percpu: Add __alloc_size attributes for better bounds checking

 Makefile                                 | 15 ++++
 drivers/rapidio/devices/rio_mport_cdev.c |  9 ++-
 include/linux/compiler-gcc.h             |  8 ++
 include/linux/compiler_attributes.h      | 10 +++
 include/linux/compiler_types.h           | 12 +++
 include/linux/gfp.h                      |  4 +-
 include/linux/mm.h                       | 16 ++--
 include/linux/percpu.h                   |  6 +-
 include/linux/slab.h                     | 99 +++++++++++++-----------
 include/linux/vmalloc.h                  | 22 +++---
 scripts/checkpatch.pl                    |  3 +-
 11 files changed, 128 insertions(+), 76 deletions(-)

-- 
2.30.2