#!/bin/bash # udelay() test script # # Test is executed by writing and reading to /sys/kernel/debug/udelay_test # and exercises a variety of delays to ensure that udelay() is delaying # at least as long as requested (as compared to ktime). # # Copyright (C) 2014 Google, Inc. # # This software is licensed under the terms of the GNU General Public # License version 2, as published by the Free Software Foundation, and # may be copied, distributed, and modified under those terms. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. MODULE_NAME=udelay_test UDELAY_PATH=/sys/kernel/debug/udelay_test setup() { /sbin/modprobe -q $MODULE_NAME tmp_file=`mktemp` } test_one() { delay=$1 echo $delay > $UDELAY_PATH tee -a $tmp_file < $UDELAY_PATH } cleanup() { if [ -f $tmp_file ]; then rm $tmp_file fi /sbin/modprobe -q -r $MODULE_NAME } trap cleanup EXIT setup # Delay for a variety of times. # 1..200, 200..500 (by 10), 500..2000 (by 100) for (( delay = 1; delay < 200; delay += 1 )); do test_one $delay done for (( delay = 200; delay < 500; delay += 10 )); do test_one $delay done for (( delay = 500; delay <= 2000; delay += 100 )); do test_one $delay done # Search for failures count=`grep -c FAIL $tmp_file` if [ $? -eq "0" ]; then echo "ERROR: $count delays failed to delay long enough" retcode=1 fi exit $retcode obias Klauser
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authorTejun Heo <tj@kernel.org>2017-01-26 16:47:28 -0500
committerTejun Heo <tj@kernel.org>2017-01-26 16:47:28 -0500
commit07cd12945551b63ecb1a349d50a6d69d1d6feb4a (patch)
tree75f65eba7eac9277971082a2d5a4cf1370562c0c /net/packet/internal.h
parent7ce7d89f48834cefece7804d38fc5d85382edf77 (diff)
cgroup: don't online subsystems before cgroup_name/path() are operational
While refactoring cgroup creation, a5bca2152036 ("cgroup: factor out cgroup_create() out of cgroup_mkdir()") incorrectly onlined subsystems before the new cgroup is associated with it kernfs_node. This is fine for cgroup proper but cgroup_name/path() depend on the associated kernfs_node and if a subsystem makes the new cgroup_subsys_state visible, which they're allowed to after onlining, it can lead to NULL dereference. The current code performs cgroup creation and subsystem onlining in cgroup_create() and cgroup_mkdir() makes the cgroup and subsystems visible afterwards. There's no reason to online the subsystems early and we can simply drop cgroup_apply_control_enable() call from cgroup_create() so that the subsystems are onlined and made visible at the same time. Signed-off-by: Tejun Heo <tj@kernel.org> Reported-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru> Fixes: a5bca2152036 ("cgroup: factor out cgroup_create() out of cgroup_mkdir()") Cc: stable@vger.kernel.org # v4.6+
Diffstat (limited to 'net/packet/internal.h')