| From: |
| David Drysdale <drysdale@google.com> |
| To: |
| linux-kernel@vger.kernel.org, Alexander Viro <viro@zeniv.linux.org.uk>, Kees Cook <keescook@chromium.org> |
| Subject: |
| [PATCH 0/3] fs: add O_BENEATH flag to openat(2) |
| Date: |
| Mon, 3 Nov 2014 11:48:22 +0000 |
| Message-ID: |
| <1415015305-15494-1-git-send-email-drysdale@google.com> |
| Cc: |
| Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Meredydd Luff <meredydd@senatehouse.org>, Will Drewry <wad@chromium.org>, Jorge Lucangeli Obes <jorgelo@google.com>, Ricky Zhou <rickyz@google.com>, Lee Campbell <leecam@google.com>, Julien Tinnes <jln@google.com>, Mike Depinet <mdepinet@google.com>, James Morris <james.l.morris@oracle.com>, Andy Lutomirski <luto@amacapital.net>, Paolo Bonzini <pbonzini@redhat.com>, Paul Moore <paul@paul-moore.com>, Christoph Hellwig <hch@infradead.org>, "Eric W. Biederman" <ebiederm@xmission.com>, linux-api@vger.kernel.org, linux-security-module@vger.kernel.org, David Drysdale <drysdale@google.com> |
| Archive‑link: | |
Article |
This change adds a new O_BENEATH flag for openat(2) which restricts the
provided path, rejecting (with -EACCES) paths that are not beneath
the provided dfd.
This change was previously included as part of a larger patchset
(https://lkml.org/lkml/2014/7/25/426) for Capsicum support; however, it
is potentially useful as an independent change so I've pulled it out
separately here.
In particular, various folks from Chrome[OS] have indicated an interest
in having this functionality.
Changes since the version included in the Capsicum v2 patchset:
- Add tests of normal symlinks
- Fix man-page typo
- Update patch to 3.17
Changes from v1 to v2 of Capsicum patchset:
- renamed O_BENEATH_ONLY to O_BENEATH [Christoph Hellwig]
David Drysdale (2):
fs: add O_BENEATH flag to openat(2)
selftests: Add test of O_BENEATH & openat(2)
arch/alpha/include/uapi/asm/fcntl.h | 1 +
arch/parisc/include/uapi/asm/fcntl.h | 1 +
arch/sparc/include/uapi/asm/fcntl.h | 1 +
fs/fcntl.c | 5 +-
fs/namei.c | 43 ++++++---
fs/open.c | 4 +-
include/linux/namei.h | 1 +
include/uapi/asm-generic/fcntl.h | 4 +
tools/testing/selftests/Makefile | 1 +
tools/testing/selftests/openat/.gitignore | 3 +
tools/testing/selftests/openat/Makefile | 24 +++++
tools/testing/selftests/openat/openat.c | 149 ++++++++++++++++++++++++++++++
12 files changed, 220 insertions(+), 17 deletions(-)
create mode 100644 tools/testing/selftests/openat/.gitignore
create mode 100644 tools/testing/selftests/openat/Makefile
create mode 100644 tools/testing/selftests/openat/openat.c
--
2.1.0.rc2.206.gedb03e5
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