diff options
| author | Nicolas Pitre <nicolas.pitre@linaro.org> | 2016-11-11 00:10:10 -0500 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2016-11-16 09:26:35 +0100 |
| commit | baa73d9e478ff32d62f3f9422822b59dd9a95a21 (patch) | |
| tree | ec1ac1b90e4a6c6337acb564d7fb518418fc510f /security | |
| parent | 53d3eaa31508222e445b489f3c3ac4c63542a4ef (diff) | |
| download | lwn-baa73d9e478ff32d62f3f9422822b59dd9a95a21.tar.gz lwn-baa73d9e478ff32d62f3f9422822b59dd9a95a21.zip | |
posix-timers: Make them configurable
Some embedded systems have no use for them. This removes about
25KB from the kernel binary size when configured out.
Corresponding syscalls are routed to a stub logging the attempt to
use those syscalls which should be enough of a clue if they were
disabled without proper consideration. They are: timer_create,
timer_gettime: timer_getoverrun, timer_settime, timer_delete,
clock_adjtime, setitimer, getitimer, alarm.
The clock_settime, clock_gettime, clock_getres and clock_nanosleep
syscalls are replaced by simple wrappers compatible with CLOCK_REALTIME,
CLOCK_MONOTONIC and CLOCK_BOOTTIME only which should cover the vast
majority of use cases with very little code.
Signed-off-by: Nicolas Pitre <nico@linaro.org>
Acked-by: Richard Cochran <richardcochran@gmail.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: John Stultz <john.stultz@linaro.org>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Cc: Paul Bolle <pebolle@tiscali.nl>
Cc: linux-kbuild@vger.kernel.org
Cc: netdev@vger.kernel.org
Cc: Michal Marek <mmarek@suse.com>
Cc: Edward Cree <ecree@solarflare.com>
Link: http://lkml.kernel.org/r/1478841010-28605-7-git-send-email-nicolas.pitre@linaro.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'security')
| -rw-r--r-- | security/selinux/hooks.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index 09fd6108e421..38b79d797aaf 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -2525,7 +2525,8 @@ static void selinux_bprm_committing_creds(struct linux_binprm *bprm) rlim->rlim_cur = min(rlim->rlim_max, initrlim->rlim_cur); } task_unlock(current); - update_rlimit_cpu(current, rlimit(RLIMIT_CPU)); + if (IS_ENABLED(CONFIG_POSIX_TIMERS)) + update_rlimit_cpu(current, rlimit(RLIMIT_CPU)); } } @@ -2555,9 +2556,11 @@ static void selinux_bprm_committed_creds(struct linux_binprm *bprm) */ rc = avc_has_perm(osid, sid, SECCLASS_PROCESS, PROCESS__SIGINH, NULL); if (rc) { - memset(&itimer, 0, sizeof itimer); - for (i = 0; i < 3; i++) - do_setitimer(i, &itimer, NULL); + if (IS_ENABLED(CONFIG_POSIX_TIMERS)) { + memset(&itimer, 0, sizeof itimer); + for (i = 0; i < 3; i++) + do_setitimer(i, &itimer, NULL); + } spin_lock_irq(¤t->sighand->siglock); if (!fatal_signal_pending(current)) { flush_sigqueue(¤t->pending); |