diff options
| -rw-r--r-- | fs/proc/base.c | 94 |
1 files changed, 43 insertions, 51 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c index f7dc1050387f..13a345952cc7 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -1037,7 +1037,47 @@ static ssize_t oom_adj_read(struct file *file, char __user *buf, size_t count, return simple_read_from_buffer(buf, count, ppos, buffer, len); } -static DEFINE_MUTEX(oom_adj_mutex); +static int __set_oom_adj(struct file *file, int oom_adj, bool legacy) +{ + static DEFINE_MUTEX(oom_adj_mutex); + struct task_struct *task; + int err = 0; + + task = get_proc_task(file_inode(file)); + if (!task) + return -ESRCH; + + mutex_lock(&oom_adj_mutex); + if (legacy) { + if (oom_adj < task->signal->oom_score_adj && + !capable(CAP_SYS_RESOURCE)) { + err = -EACCES; + goto err_unlock; + } + /* + * /proc/pid/oom_adj is provided for legacy purposes, ask users to use + * /proc/pid/oom_score_adj instead. + */ + pr_warn_once("%s (%d): /proc/%d/oom_adj is deprecated, please use /proc/%d/oom_score_adj instead.\n", + current->comm, task_pid_nr(current), task_pid_nr(task), + task_pid_nr(task)); + } else { + if ((short)oom_adj < task->signal->oom_score_adj_min && + !capable(CAP_SYS_RESOURCE)) { + err = -EACCES; + goto err_unlock; + } + } + + task->signal->oom_score_adj = oom_adj; + if (!legacy && has_capability_noaudit(current, CAP_SYS_RESOURCE)) + task->signal->oom_score_adj_min = (short)oom_adj; + trace_oom_score_adj_update(task); +err_unlock: + mutex_unlock(&oom_adj_mutex); + put_task_struct(task); + return err; +} /* * /proc/pid/oom_adj exists solely for backwards compatibility with previous @@ -1052,7 +1092,6 @@ static DEFINE_MUTEX(oom_adj_mutex); static ssize_t oom_adj_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { - struct task_struct *task; char buffer[PROC_NUMBUF]; int oom_adj; int err; @@ -1074,12 +1113,6 @@ static ssize_t oom_adj_write(struct file *file, const char __user *buf, goto out; } - task = get_proc_task(file_inode(file)); - if (!task) { - err = -ESRCH; - goto out; - } - /* * Scale /proc/pid/oom_score_adj appropriately ensuring that a maximum * value is always attainable. @@ -1089,26 +1122,7 @@ static ssize_t oom_adj_write(struct file *file, const char __user *buf, else oom_adj = (oom_adj * OOM_SCORE_ADJ_MAX) / -OOM_DISABLE; - mutex_lock(&oom_adj_mutex); - if (oom_adj < task->signal->oom_score_adj && - !capable(CAP_SYS_RESOURCE)) { - err = -EACCES; - goto err_unlock; - } - - /* - * /proc/pid/oom_adj is provided for legacy purposes, ask users to use - * /proc/pid/oom_score_adj instead. - */ - pr_warn_once("%s (%d): /proc/%d/oom_adj is deprecated, please use /proc/%d/oom_score_adj instead.\n", - current->comm, task_pid_nr(current), task_pid_nr(task), - task_pid_nr(task)); - - task->signal->oom_score_adj = oom_adj; - trace_oom_score_adj_update(task); -err_unlock: - mutex_unlock(&oom_adj_mutex); - put_task_struct(task); + err = __set_oom_adj(file, oom_adj, true); out: return err < 0 ? err : count; } @@ -1138,7 +1152,6 @@ static ssize_t oom_score_adj_read(struct file *file, char __user *buf, static ssize_t oom_score_adj_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { - struct task_struct *task; char buffer[PROC_NUMBUF]; int oom_score_adj; int err; @@ -1160,28 +1173,7 @@ static ssize_t oom_score_adj_write(struct file *file, const char __user *buf, goto out; } - task = get_proc_task(file_inode(file)); - if (!task) { - err = -ESRCH; - goto out; - } - - mutex_lock(&oom_adj_mutex); - if ((short)oom_score_adj < task->signal->oom_score_adj_min && - !capable(CAP_SYS_RESOURCE)) { - err = -EACCES; - goto err_unlock; - } - - task->signal->oom_score_adj = (short)oom_score_adj; - if (has_capability_noaudit(current, CAP_SYS_RESOURCE)) - task->signal->oom_score_adj_min = (short)oom_score_adj; - - trace_oom_score_adj_update(task); - -err_unlock: - mutex_unlock(&oom_adj_mutex); - put_task_struct(task); + err = __set_oom_adj(file, oom_score_adj, false); out: return err < 0 ? err : count; } |