#!/bin/sh if [ `id -u` -ne 0 ]; then echo "$0: must be root to install the selinux policy" exit 1 fi SF=`which setfiles` if [ $? -eq 1 ]; then if [ -f /sbin/setfiles ]; then SF="/usr/setfiles" else echo "no selinux tools installed: setfiles" exit 1 fi fi cd mdp CP=`which checkpolicy` VERS=`$CP -V | awk '{print $1}'` ./mdp policy.conf file_contexts $CP -o policy.$VERS policy.conf mkdir -p /etc/selinux/dummy/policy mkdir -p /etc/selinux/dummy/contexts/files cp file_contexts /etc/selinux/dummy/contexts/files cp dbus_contexts /etc/selinux/dummy/contexts cp policy.$VERS /etc/selinux/dummy/policy FC_FILE=/etc/selinux/dummy/contexts/files/file_contexts if [ ! -d /etc/selinux ]; then mkdir -p /etc/selinux fi if [ ! -f /etc/selinux/config ]; then cat > /etc/selinux/config << EOF SELINUX=enforcing SELINUXTYPE=dummy EOF else TYPE=`cat /etc/selinux/config | grep "^SELINUXTYPE" | tail -1 | awk -F= '{ print $2 '}` if [ "eq$TYPE" != "eqdummy" ]; then selinuxenabled if [ $? -eq 0 ]; then echo "SELinux already enabled with a non-dummy policy." echo "Exiting. Please install policy by hand if that" echo "is what you REALLY want." exit 1 fi mv /etc/selinux/config /etc/selinux/config.mdpbak grep -v "^SELINUXTYPE" /etc/selinux/config.mdpbak >> /etc/selinux/config echo "SELINUXTYPE=dummy" >> /etc/selinux/config fi fi cd /etc/selinux/dummy/contexts/files $SF file_contexts / mounts=`cat /proc/$$/mounts | egrep "ext2|ext3|xfs|jfs|ext4|ext4dev|gfs2" | awk '{ print $2 '}` $SF file_contexts $mounts dodev=`cat /proc/$$/mounts | grep "/dev "` if [ "eq$dodev" != "eq" ]; then mount --move /dev /mnt $SF file_contexts /dev mount --move /mnt /dev fi efs/?h=nds-private-remove&id=966d2b04e070bc040319aaebfec09e0144dc3341'>refslogtreecommitdiff
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authorDouglas Miller <dougmill@linux.vnet.ibm.com>2017-01-28 06:42:20 -0600
committerTejun Heo <tj@kernel.org>2017-01-28 07:49:42 -0500
commit966d2b04e070bc040319aaebfec09e0144dc3341 (patch)
tree4b96156e3d1dd4dfd6039b7c219c9dc4616da52d /sound/soc/cirrus/edb93xx.c
parent1b1bc42c1692e9b62756323c675a44cb1a1f9dbd (diff)
percpu-refcount: fix reference leak during percpu-atomic transition
percpu_ref_tryget() and percpu_ref_tryget_live() should return "true" IFF they acquire a reference. But the return value from atomic_long_inc_not_zero() is a long and may have high bits set, e.g. PERCPU_COUNT_BIAS, and the return value of the tryget routines is bool so the reference may actually be acquired but the routines return "false" which results in a reference leak since the caller assumes it does not need to do a corresponding percpu_ref_put(). This was seen when performing CPU hotplug during I/O, as hangs in blk_mq_freeze_queue_wait where percpu_ref_kill (blk_mq_freeze_queue_start) raced with percpu_ref_tryget (blk_mq_timeout_work). Sample stack trace: __switch_to+0x2c0/0x450 __schedule+0x2f8/0x970 schedule+0x48/0xc0 blk_mq_freeze_queue_wait+0x94/0x120 blk_mq_queue_reinit_work+0xb8/0x180 blk_mq_queue_reinit_prepare+0x84/0xa0 cpuhp_invoke_callback+0x17c/0x600 cpuhp_up_callbacks+0x58/0x150 _cpu_up+0xf0/0x1c0 do_cpu_up+0x120/0x150 cpu_subsys_online+0x64/0xe0 device_online+0xb4/0x120 online_store+0xb4/0xc0 dev_attr_store+0x68/0xa0 sysfs_kf_write+0x80/0xb0 kernfs_fop_write+0x17c/0x250 __vfs_write+0x6c/0x1e0 vfs_write+0xd0/0x270 SyS_write+0x6c/0x110 system_call+0x38/0xe0 Examination of the queue showed a single reference (no PERCPU_COUNT_BIAS, and __PERCPU_REF_DEAD, __PERCPU_REF_ATOMIC set) and no requests. However, conditions at the time of the race are count of PERCPU_COUNT_BIAS + 0 and __PERCPU_REF_DEAD and __PERCPU_REF_ATOMIC set. The fix is to make the tryget routines use an actual boolean internally instead of the atomic long result truncated to a int. Fixes: e625305b3907 percpu-refcount: make percpu_ref based on longs instead of ints Link: https://bugzilla.kernel.org/show_bug.cgi?id=190751 Signed-off-by: Douglas Miller <dougmill@linux.vnet.ibm.com> Reviewed-by: Jens Axboe <axboe@fb.com> Signed-off-by: Tejun Heo <tj@kernel.org> Fixes: e625305b3907 ("percpu-refcount: make percpu_ref based on longs instead of ints") Cc: stable@vger.kernel.org # v3.18+
Diffstat (limited to 'sound/soc/cirrus/edb93xx.c')