[PATCH v2 0/7] Add __alloc_size() for better bounds checking

Kees Cook
2021-08-18T21:40:39Z

Hi,

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.

To build without warnings, this series needs a couple small fixes for
allmodconfig, which I sent separately:
https://lore.kernel.org/lkml/20210818174855.2307828-5-keescook@chromium.org/
https://lore.kernel.org/lkml/20210818044252.1533634-1-keescook@chromium.org/
https://lore.kernel.org/lkml/20210818043912.1466447-1-keescook@chromium.org/

I figure I can take this via my "overflow" series, or it could go via
-mm?

-Kees

v2:
- clean up slab function declarations (joe)
- update checkpatch.pl attribute regex (joe)
- explain the Makefile changes better (ojeda, nathan)
v1: https://lore.kernel.org/lkml/20210818050841.2226600-1-keescook@chromium.org

Kees Cook (7):
Compiler Attributes: Add __alloc_size() for better bounds checking
checkpatch: Add __alloc_size() to known $Attribute
slab: Clean up function declarations
slab: 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
mm/vmalloc: Add __alloc_size attributes for better bounds checking

Makefile | 6 ++-
include/linux/compiler_attributes.h | 6 +++
include/linux/gfp.h | 2 +
include/linux/percpu.h | 3 ++
include/linux/slab.h | 84 +++++++++++++++++------------
include/linux/vmalloc.h | 11 ++++
scripts/checkpatch.pl | 3 +-
7 files changed, 80 insertions(+), 35 deletions(-)

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2.30.2