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-rw-r--r--fs/proc/base.c30
1 files changed, 30 insertions, 0 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c
index dc5d5f51f3fe..6e50c8e65513 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -1047,6 +1047,21 @@ static ssize_t oom_adjust_write(struct file *file, const char __user *buf,
return -EACCES;
}
+ task_lock(task);
+ if (!task->mm) {
+ task_unlock(task);
+ unlock_task_sighand(task, &flags);
+ put_task_struct(task);
+ return -EINVAL;
+ }
+
+ if (oom_adjust != task->signal->oom_adj) {
+ if (oom_adjust == OOM_DISABLE)
+ atomic_inc(&task->mm->oom_disable_count);
+ if (task->signal->oom_adj == OOM_DISABLE)
+ atomic_dec(&task->mm->oom_disable_count);
+ }
+
/*
* Warn that /proc/pid/oom_adj is deprecated, see
* Documentation/feature-removal-schedule.txt.
@@ -1065,6 +1080,7 @@ static ssize_t oom_adjust_write(struct file *file, const char __user *buf,
else
task->signal->oom_score_adj = (oom_adjust * OOM_SCORE_ADJ_MAX) /
-OOM_DISABLE;
+ task_unlock(task);
unlock_task_sighand(task, &flags);
put_task_struct(task);
@@ -1133,6 +1149,19 @@ static ssize_t oom_score_adj_write(struct file *file, const char __user *buf,
return -EACCES;
}
+ task_lock(task);
+ if (!task->mm) {
+ task_unlock(task);
+ unlock_task_sighand(task, &flags);
+ put_task_struct(task);
+ return -EINVAL;
+ }
+ if (oom_score_adj != task->signal->oom_score_adj) {
+ if (oom_score_adj == OOM_SCORE_ADJ_MIN)
+ atomic_inc(&task->mm->oom_disable_count);
+ if (task->signal->oom_score_adj == OOM_SCORE_ADJ_MIN)
+ atomic_dec(&task->mm->oom_disable_count);
+ }
task->signal->oom_score_adj = oom_score_adj;
/*
* Scale /proc/pid/oom_adj appropriately ensuring that OOM_DISABLE is
@@ -1143,6 +1172,7 @@ static ssize_t oom_score_adj_write(struct file *file, const char __user *buf,
else
task->signal->oom_adj = (oom_score_adj * OOM_ADJUST_MAX) /
OOM_SCORE_ADJ_MAX;
+ task_unlock(task);
unlock_task_sighand(task, &flags);
put_task_struct(task);
return count;