cpuset_common_seq_show operations atomicity is currently guarded by callback_lock. Since these operations are initiated by userspace holding a raw_spin_lock is not wise.
Convert the function to use cpuset_mutex to fix the problem. Signed-off-by: Juri Lelli <[email protected]> --- kernel/cgroup/cpuset.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c index cb5ff6ca5d2c..91ef48bbc08d 100644 --- a/kernel/cgroup/cpuset.c +++ b/kernel/cgroup/cpuset.c @@ -2444,7 +2444,7 @@ static int cpuset_common_seq_show(struct seq_file *sf, void *v) cpuset_filetype_t type = seq_cft(sf)->private; int ret = 0; - raw_spin_lock_irq(&callback_lock); + mutex_lock(&cpuset_mutex); switch (type) { case FILE_CPULIST: @@ -2466,7 +2466,7 @@ static int cpuset_common_seq_show(struct seq_file *sf, void *v) ret = -EINVAL; } - raw_spin_unlock_irq(&callback_lock); + mutex_unlock(&cpuset_mutex); return ret; } -- 2.17.2
