linux-hardening - [GIT PULL] Enable -Wstringop-overflow globally

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Message-ID: <Za6JwRpknVIlfhPF@work>
Date: Mon, 22 Jan 2024 09:29:05 -0600
From: "Gustavo A. R. Silva" <gustavoars@...nel.org>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Kees Cook <keescook@...omium.org>, linux-hardening@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>
Subject: [GIT PULL] Enable -Wstringop-overflow globally

The following changes since commit 6613476e225e090cc9aad49be7fa504e290dd33d:

  Linux 6.8-rc1 (2024-01-21 14:11:32 -0800)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux.git tags/Wstringop-overflow-for-6.8-rc2

for you to fetch changes up to a5e0ace04fbf56c1794b1a2fa7a93672753b3fc7:

  init: Kconfig: Disable -Wstringop-overflow for GCC-11 (2024-01-21 17:45:31 -0600)

----------------------------------------------------------------
Enable -Wstringop-overflow globally

Hi Linus,

Please, pull the following patches that enable -Wstringop-overflow,
globally. These patches have been baking in linux-next for a whole
development cycle.

I waited for the release of -rc1 to run a final build-test on top of
it before sending this pull request. Fortunatelly, after building
358 kernels overnight (basically all supported archs with a wide
variety of configs), no more warnings have surfaced! :)

Thus, we are in a good position to enable this compiler option for
all versions of GCC that support it, with the exception of GCC-11,
which appears to have some issues with this option[1].

[1] https://lore.kernel.org/lkml/b3c99290-40bc-426f-b3d2-1aa903f95c4e@embeddedor.com/

Thanks
--
Gustavo

----------------------------------------------------------------
Gustavo A. R. Silva (2):
      Makefile: Enable -Wstringop-overflow globally
      init: Kconfig: Disable -Wstringop-overflow for GCC-11

 Makefile                   |  4 ++++
 init/Kconfig               | 12 ++++++++++++
 scripts/Makefile.extrawarn |  2 --
 3 files changed, 16 insertions(+), 2 deletions(-)