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Stephen Smalley fec839cf17 libselinux: simplify procattr cache 
https://github.com/systemd/systemd/issues/475 identified a problem
in libselinux with using getpid(3) rather than getpid(2) due to direct
use of the clone() system call by systemd.  We could change libselinux
to use getpid(2) instead, but this would impose a getpid(2) system call
overhead on each get*con() or set*con() call.  Rather than do this,
we can instead simplify the procattr cache and get rid of the
caching of the pid and tid entirely, along with the atfork handler.
With commit 3430519109 ("use
/proc/thread-self when available"), we only need the tid when
on Linux < 3.17, so we can just always call gettid() in that case (as
done prior to the procattr cache) and drop the cached tid. The cached
pid and atfork handlers were only needed to reset the cached tid, so
those can also be dropped. The rest of the cached attributes are not
reset by the kernel on fork, only on exec, so we do not need to
flush them upon fork/clone.

Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
2015-07-20 12:56:01 -04:00
checkpolicy Update checkpolicy and libsepol ChangeLogs. 2015-06-15 09:23:20 -04:00
libselinux libselinux: simplify procattr cache 2015-07-20 12:56:01 -04:00
libsemanage Updated libsemanage ChangeLog. 2015-07-06 11:08:33 -04:00
libsepol Updated libsepol ChangeLog. 2015-07-16 09:37:15 -04:00
policycoreutils Updated policycoreutils ChangeLog. 2015-07-16 13:11:01 -04:00
scripts Add secilc to release script. 2015-03-31 12:41:28 -04:00
secilc Updated libsepol and secilc ChangeLogs. 2015-06-22 10:04:26 -04:00
sepolgen Updated sepolgen ChangeLog. 2015-07-16 13:11:14 -04:00
.gitignore global: gitignore: add a couple of more editor backup filetypes 2013-02-01 12:14:57 -05:00
Android.mk Add empty top level Android.mk / CleanSpec.mk files 2015-04-16 07:54:09 -04:00
CleanSpec.mk Add empty top level Android.mk / CleanSpec.mk files 2015-04-16 07:54:09 -04:00
Makefile libsepol: Move secilc out of libsepol 2015-03-31 12:31:38 -04:00
README Add further build dependencies. 2015-02-23 09:08:13 -05:00

README 

Please submit all bug reports and patches to selinux@tycho.nsa.gov.
Subscribe via selinux-join@tycho.nsa.gov.

Build dependencies on Fedora:
yum install audit-libs-devel bison bzip2-devel dbus-devel dbus-glib-devel flex flex-devel flex-static glib2-devel libcap-devel libcap-ng-devel pam-devel pcre-devel python-devel setools-devel swig ustr-devel

To build and install everything under a private directory, run:
make DESTDIR=~/obj install install-pywrap

To install as the default system libraries and binaries
(overwriting any previously installed ones - dangerous!),
on x86_64, run:
make LIBDIR=/usr/lib64 SHLIBDIR=/lib64 install install-pywrap relabel
or on x86 (32-bit), run:
make install install-pywrap relabel

This may render your system unusable if the upstream SELinux userspace
lacks library functions or other dependencies relied upon by your
distribution.  If it breaks, you get to keep both pieces.