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timerfd_create() and do_timerfd_settime() evaluate capable(CAP_WAKE_ALARM) unconditionally although CAP_WAKE_ALARM is only required for CLOCK_REALTIME_ALARM and CLOCK_BOOTTIME_ALARM. This can cause extraneous audit messages when using a LSM such as SELinux, incorrectly causes PF_SUPERPRIV to be set even when no privilege was exercised, and is inefficient. Flip the order of the tests in both functions so that we only call capable() if the capability is truly required for the operation. Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov> Cc: linux-security-module@vger.kernel.org Cc: selinux@tycho.nsa.gov Link: http://lkml.kernel.org/r/1487344439-22293-1-git-send-email-sds@tycho.nsa.gov Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.