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Date: Wed, 22 Nov 2017 09:01:44 +0100
From: Salvatore Mesoraca <s.mesoraca16@...il.com>
To: linux-kernel@...r.kernel.org
Cc: Kernel Hardening <kernel-hardening@...ts.openwall.com>,
linux-fsdevel@...r.kernel.org,
Salvatore Mesoraca <s.mesoraca16@...il.com>,
Alexander Viro <viro@...iv.linux.org.uk>,
Jann Horn <jannh@...gle.com>,
Kees Cook <keescook@...omium.org>,
Solar Designer <solar@...nwall.com>,
"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: [PATCH v3 0/2] Restrict dangerous open in sticky directories
This patch-set introduces two separate features aimed at restricting
dangerous open in world or group writable sticky directories.
The purpose is to prevent exploitable bugs in user-space programs
that don't access sticky directories in the proper way.
The first patch prevents the O_CREAT open of FIFOs and regular files
in world or group writable sticky directories, if they already exists
and are owned by someone else.
The second patch prevents O_CREAT open in world or group writable
sticky when the O_EXCL flag is not set, even if the file doesn't
exist yet.
More details can be found in the respective commit messages.
Changes in v3:
- Fixed format string for uid_t that is unsigned
(suggested by Jann Horn).
- Stop checking if file's and parent dir's owners match in
may_create_no_excl. This will allow to discover potential
vulnerabilities more easily.
Salvatore Mesoraca (2):
Protected FIFOs and regular files
Protected O_CREAT open in sticky directories
Documentation/sysctl/fs.txt | 66 +++++++++++++++++++++++++
fs/namei.c | 117 ++++++++++++++++++++++++++++++++++++++++++--
include/linux/fs.h | 3 ++
kernel/sysctl.c | 27 ++++++++++
4 files changed, 210 insertions(+), 3 deletions(-)
--
1.9.1
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