[PATCH 0/4] Relocate execve() sanity checks

From: Kees Cook <keescook@chromium.org>
To: Al Viro <viro@zeniv.linux.org.uk>
Cc: Kees Cook <keescook@chromium.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>,
	Eric Biggers <ebiggers3@gmail.com>,
	Dmitry Vyukov <dvyukov@google.com>,
	linux-fsdevel@vger.kernel.org,
	linux-security-module@vger.kernel.org, linux-api@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH 0/4] Relocate execve() sanity checks
Date: Sun, 17 May 2020 22:54:53 -0700	[thread overview]
Message-ID: <20200518055457.12302-1-keescook@chromium.org> (raw)

Hi,

While looking at the code paths for the proposed O_MAYEXEC flag, I saw
some things that looked like they should be fixed up.

  exec: Change uselib(2) IS_SREG() failure to EACCES
	This just regularizes the return code on uselib(2).

  exec: Relocate S_ISREG() check
	This moves the S_ISREG() check even earlier than it was already.

  exec: Relocate path_noexec() check
	This adds the path_noexec() check to the same place as the
	S_ISREG() check.

  fs: Include FMODE_EXEC when converting flags to f_mode
	This seemed like an oversight, but I suspect there is some
	reason I couldn't find for why FMODE_EXEC doesn't get set in
	f_mode and just stays in f_flags.

Thanks!

-Kees

Kees Cook (4):
  exec: Change uselib(2) IS_SREG() failure to EACCES
  exec: Relocate S_ISREG() check
  exec: Relocate path_noexec() check
  fs: Include FMODE_EXEC when converting flags to f_mode

 fs/exec.c                | 13 +++++++++----
 fs/namei.c               |  5 +++++
 fs/open.c                |  6 ------
 include/linux/fs.h       |  3 ++-
 include/linux/fsnotify.h |  4 ++--
 5 files changed, 18 insertions(+), 13 deletions(-)

-- 
2.20.1