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Diffstat (limited to 'fs/proc/base.c')
-rw-r--r--fs/proc/base.c88
1 files changed, 46 insertions, 42 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c
index 0edf14a9840e..c667702dc69b 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -416,7 +416,7 @@ static const struct file_operations proc_pid_cmdline_ops = {
#ifdef CONFIG_KALLSYMS
/*
* Provides a wchan file via kallsyms in a proper one-value-per-file format.
- * Returns the resolved symbol. If that fails, simply return the address.
+ * Returns the resolved symbol to user space.
*/
static int proc_pid_wchan(struct seq_file *m, struct pid_namespace *ns,
struct pid *pid, struct task_struct *task)
@@ -827,7 +827,13 @@ static const struct file_operations proc_single_file_operations = {
.release = single_release,
};
-
+/*
+ * proc_mem_open() can return errno, NULL or mm_struct*.
+ *
+ * - Returns NULL if the task has no mm (PF_KTHREAD or PF_EXITING)
+ * - Returns mm_struct* on success
+ * - Returns error code on failure
+ */
struct mm_struct *proc_mem_open(struct inode *inode, unsigned int mode)
{
struct task_struct *task = get_proc_task(inode);
@@ -854,8 +860,8 @@ static int __mem_open(struct inode *inode, struct file *file, unsigned int mode)
{
struct mm_struct *mm = proc_mem_open(inode, mode);
- if (IS_ERR(mm))
- return PTR_ERR(mm);
+ if (IS_ERR_OR_NULL(mm))
+ return mm ? PTR_ERR(mm) : -ESRCH;
file->private_data = mm;
return 0;
@@ -1489,7 +1495,6 @@ static const struct file_operations proc_fail_nth_operations = {
#endif
-#ifdef CONFIG_SCHED_DEBUG
/*
* Print out various scheduling related per-task fields:
*/
@@ -1539,8 +1544,6 @@ static const struct file_operations proc_pid_sched_operations = {
.release = single_release,
};
-#endif
-
#ifdef CONFIG_SCHED_AUTOGROUP
/*
* Print out autogroup related information:
@@ -2058,7 +2061,8 @@ void pid_update_inode(struct task_struct *task, struct inode *inode)
* performed a setuid(), etc.
*
*/
-static int pid_revalidate(struct dentry *dentry, unsigned int flags)
+static int pid_revalidate(struct inode *dir, const struct qstr *name,
+ struct dentry *dentry, unsigned int flags)
{
struct inode *inode;
struct task_struct *task;
@@ -2123,7 +2127,7 @@ bool proc_fill_cache(struct file *file, struct dir_context *ctx,
unsigned type = DT_UNKNOWN;
ino_t ino = 1;
- child = d_hash_and_lookup(dir, &qname);
+ child = try_lookup_noperm(&qname, dir);
if (!child) {
DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq);
child = d_alloc_parallel(dir, &qname, &wq);
@@ -2191,7 +2195,8 @@ static int dname_to_vma_addr(struct dentry *dentry,
return 0;
}
-static int map_files_d_revalidate(struct dentry *dentry, unsigned int flags)
+static int map_files_d_revalidate(struct inode *dir, const struct qstr *name,
+ struct dentry *dentry, unsigned int flags)
{
unsigned long vm_start, vm_end;
bool exact_vma_exists = false;
@@ -2495,11 +2500,9 @@ static const struct file_operations proc_map_files_operations = {
#if defined(CONFIG_CHECKPOINT_RESTORE) && defined(CONFIG_POSIX_TIMERS)
struct timers_private {
- struct pid *pid;
- struct task_struct *task;
- struct sighand_struct *sighand;
- struct pid_namespace *ns;
- unsigned long flags;
+ struct pid *pid;
+ struct task_struct *task;
+ struct pid_namespace *ns;
};
static void *timers_start(struct seq_file *m, loff_t *pos)
@@ -2510,54 +2513,48 @@ static void *timers_start(struct seq_file *m, loff_t *pos)
if (!tp->task)
return ERR_PTR(-ESRCH);
- tp->sighand = lock_task_sighand(tp->task, &tp->flags);
- if (!tp->sighand)
- return ERR_PTR(-ESRCH);
-
- return seq_hlist_start(&tp->task->signal->posix_timers, *pos);
+ rcu_read_lock();
+ return seq_hlist_start_rcu(&tp->task->signal->posix_timers, *pos);
}
static void *timers_next(struct seq_file *m, void *v, loff_t *pos)
{
struct timers_private *tp = m->private;
- return seq_hlist_next(v, &tp->task->signal->posix_timers, pos);
+
+ return seq_hlist_next_rcu(v, &tp->task->signal->posix_timers, pos);
}
static void timers_stop(struct seq_file *m, void *v)
{
struct timers_private *tp = m->private;
- if (tp->sighand) {
- unlock_task_sighand(tp->task, &tp->flags);
- tp->sighand = NULL;
- }
-
if (tp->task) {
put_task_struct(tp->task);
tp->task = NULL;
+ rcu_read_unlock();
}
}
static int show_timer(struct seq_file *m, void *v)
{
- struct k_itimer *timer;
- struct timers_private *tp = m->private;
- int notify;
static const char * const nstr[] = {
- [SIGEV_SIGNAL] = "signal",
- [SIGEV_NONE] = "none",
- [SIGEV_THREAD] = "thread",
+ [SIGEV_SIGNAL] = "signal",
+ [SIGEV_NONE] = "none",
+ [SIGEV_THREAD] = "thread",
};
- timer = hlist_entry((struct hlist_node *)v, struct k_itimer, list);
- notify = timer->it_sigev_notify;
+ struct k_itimer *timer = hlist_entry((struct hlist_node *)v, struct k_itimer, list);
+ struct timers_private *tp = m->private;
+ int notify = timer->it_sigev_notify;
+
+ guard(spinlock_irq)(&timer->it_lock);
+ if (!posixtimer_valid(timer))
+ return 0;
seq_printf(m, "ID: %d\n", timer->it_id);
- seq_printf(m, "signal: %d/%px\n",
- timer->sigq.info.si_signo,
+ seq_printf(m, "signal: %d/%px\n", timer->sigq.info.si_signo,
timer->sigq.info.si_value.sival_ptr);
- seq_printf(m, "notify: %s/%s.%d\n",
- nstr[notify & ~SIGEV_THREAD_ID],
+ seq_printf(m, "notify: %s/%s.%d\n", nstr[notify & ~SIGEV_THREAD_ID],
(notify & SIGEV_THREAD_ID) ? "tid" : "pid",
pid_nr_ns(timer->it_pid, tp->ns));
seq_printf(m, "ClockID: %d\n", timer->it_clock);
@@ -3269,6 +3266,7 @@ static int proc_pid_ksm_stat(struct seq_file *m, struct pid_namespace *ns,
struct pid *pid, struct task_struct *task)
{
struct mm_struct *mm;
+ int ret = 0;
mm = get_task_mm(task);
if (mm) {
@@ -3276,6 +3274,16 @@ static int proc_pid_ksm_stat(struct seq_file *m, struct pid_namespace *ns,
seq_printf(m, "ksm_zero_pages %ld\n", mm_ksm_zero_pages(mm));
seq_printf(m, "ksm_merging_pages %lu\n", mm->ksm_merging_pages);
seq_printf(m, "ksm_process_profit %ld\n", ksm_process_profit(mm));
+ seq_printf(m, "ksm_merge_any: %s\n",
+ test_bit(MMF_VM_MERGE_ANY, &mm->flags) ? "yes" : "no");
+ ret = mmap_read_lock_killable(mm);
+ if (ret) {
+ mmput(mm);
+ return ret;
+ }
+ seq_printf(m, "ksm_mergeable: %s\n",
+ ksm_process_mergeable(mm) ? "yes" : "no");
+ mmap_read_unlock(mm);
mmput(mm);
}
@@ -3318,9 +3326,7 @@ static const struct pid_entry tgid_base_stuff[] = {
ONE("status", S_IRUGO, proc_pid_status),
ONE("personality", S_IRUSR, proc_pid_personality),
ONE("limits", S_IRUGO, proc_pid_limits),
-#ifdef CONFIG_SCHED_DEBUG
REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations),
-#endif
#ifdef CONFIG_SCHED_AUTOGROUP
REG("autogroup", S_IRUGO|S_IWUSR, proc_pid_sched_autogroup_operations),
#endif
@@ -3669,9 +3675,7 @@ static const struct pid_entry tid_base_stuff[] = {
ONE("status", S_IRUGO, proc_pid_status),
ONE("personality", S_IRUSR, proc_pid_personality),
ONE("limits", S_IRUGO, proc_pid_limits),
-#ifdef CONFIG_SCHED_DEBUG
REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations),
-#endif
NOD("comm", S_IFREG|S_IRUGO|S_IWUSR,
&proc_tid_comm_inode_operations,
&proc_pid_set_comm_operations, {}),
generated by cgit (git 2.34.1) at 2025-06-07 12:57:37 +0000