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Diffstat (limited to 'fs/proc/base.c')
-rw-r--r--fs/proc/base.c148
1 files changed, 85 insertions, 63 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c
index 699f085d4de7..a2541f5204af 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -98,6 +98,7 @@
#include <linux/resctrl.h>
#include <linux/cn_proc.h>
#include <linux/ksm.h>
+#include <uapi/linux/lsm.h>
#include <trace/events/oom.h>
#include "internal.h"
#include "fd.h"
@@ -181,10 +182,10 @@ struct pid_entry {
NOD(NAME, (S_IFREG|(MODE)), \
NULL, &proc_single_file_operations, \
{ .proc_show = show } )
-#define ATTR(LSM, NAME, MODE) \
+#define ATTR(LSMID, NAME, MODE) \
NOD(NAME, (S_IFREG|(MODE)), \
NULL, &proc_pid_attr_operations, \
- { .lsm = LSM })
+ { .lsmid = LSMID })
/*
* Count the number of hardlinks for the pid_entry table, excluding the .
@@ -416,7 +417,7 @@ 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)
@@ -861,12 +862,9 @@ static int __mem_open(struct inode *inode, struct file *file, unsigned int mode)
static int mem_open(struct inode *inode, struct file *file)
{
- int ret = __mem_open(inode, file, PTRACE_MODE_ATTACH);
-
- /* OK to pass negative loff_t, we can catch out-of-range */
- file->f_mode |= FMODE_UNSIGNED_OFFSET;
-
- return ret;
+ if (WARN_ON_ONCE(!(file->f_op->fop_flags & FOP_UNSIGNED_OFFSET)))
+ return -EINVAL;
+ return __mem_open(inode, file, PTRACE_MODE_ATTACH);
}
static bool proc_mem_foll_force(struct file *file, struct mm_struct *mm)
@@ -990,6 +988,7 @@ static const struct file_operations proc_mem_operations = {
.write = mem_write,
.open = mem_open,
.release = mem_release,
+ .fop_flags = FOP_UNSIGNED_OFFSET,
};
static int environ_open(struct inode *inode, struct file *file)
@@ -1212,11 +1211,10 @@ err_unlock:
static ssize_t oom_adj_write(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
- char buffer[PROC_NUMBUF];
+ char buffer[PROC_NUMBUF] = {};
int oom_adj;
int err;
- memset(buffer, 0, sizeof(buffer));
if (count > sizeof(buffer) - 1)
count = sizeof(buffer) - 1;
if (copy_from_user(buffer, buf, count)) {
@@ -1272,11 +1270,10 @@ 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)
{
- char buffer[PROC_NUMBUF];
+ char buffer[PROC_NUMBUF] = {};
int oom_score_adj;
int err;
- memset(buffer, 0, sizeof(buffer));
if (count > sizeof(buffer) - 1)
count = sizeof(buffer) - 1;
if (copy_from_user(buffer, buf, count)) {
@@ -1417,13 +1414,13 @@ static ssize_t proc_fault_inject_write(struct file * file,
const char __user * buf, size_t count, loff_t *ppos)
{
struct task_struct *task;
- char buffer[PROC_NUMBUF];
+ char buffer[PROC_NUMBUF] = {};
int make_it_fail;
int rv;
if (!capable(CAP_SYS_RESOURCE))
return -EPERM;
- memset(buffer, 0, sizeof(buffer));
+
if (count > sizeof(buffer) - 1)
count = sizeof(buffer) - 1;
if (copy_from_user(buffer, buf, count))
@@ -1568,11 +1565,10 @@ sched_autogroup_write(struct file *file, const char __user *buf,
{
struct inode *inode = file_inode(file);
struct task_struct *p;
- char buffer[PROC_NUMBUF];
+ char buffer[PROC_NUMBUF] = {};
int nice;
int err;
- memset(buffer, 0, sizeof(buffer));
if (count > sizeof(buffer) - 1)
count = sizeof(buffer) - 1;
if (copy_from_user(buffer, buf, count))
@@ -1725,10 +1721,9 @@ static ssize_t comm_write(struct file *file, const char __user *buf,
{
struct inode *inode = file_inode(file);
struct task_struct *p;
- char buffer[TASK_COMM_LEN];
+ char buffer[TASK_COMM_LEN] = {};
const size_t maxlen = sizeof(buffer) - 1;
- memset(buffer, 0, sizeof(buffer));
if (copy_from_user(buffer, buf, count > maxlen ? maxlen : count))
return -EFAULT;
@@ -1940,8 +1935,6 @@ void proc_pid_evict_inode(struct proc_inode *ei)
hlist_del_init_rcu(&ei->sibling_inodes);
spin_unlock(&pid->lock);
}
-
- put_pid(pid);
}
struct inode *proc_pid_make_inode(struct super_block *sb,
@@ -1961,7 +1954,7 @@ struct inode *proc_pid_make_inode(struct super_block *sb,
ei = PROC_I(inode);
inode->i_mode = mode;
inode->i_ino = get_next_ino();
- inode->i_mtime = inode->i_atime = inode_set_ctime_current(inode);
+ simple_inode_init_ts(inode);
inode->i_op = &proc_def_inode_operations;
/*
@@ -2277,7 +2270,7 @@ static int map_files_get_link(struct dentry *dentry, struct path *path)
rc = -ENOENT;
vma = find_exact_vma(mm, vm_start, vm_end);
if (vma && vma->vm_file) {
- *path = vma->vm_file->f_path;
+ *path = *file_user_path(vma->vm_file);
path_get(path);
rc = 0;
}
@@ -2340,8 +2333,8 @@ proc_map_files_instantiate(struct dentry *dentry,
inode->i_op = &proc_map_files_link_inode_operations;
inode->i_size = 64;
- d_set_d_op(dentry, &tid_map_files_dentry_operations);
- return d_splice_alias(inode, dentry);
+ return proc_splice_unmountable(inode, dentry,
+ &tid_map_files_dentry_operations);
}
static struct dentry *proc_map_files_lookup(struct inode *dir,
@@ -2520,13 +2513,13 @@ static void *timers_start(struct seq_file *m, loff_t *pos)
if (!tp->sighand)
return ERR_PTR(-ESRCH);
- return seq_list_start(&tp->task->signal->posix_timers, *pos);
+ return seq_hlist_start(&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_list_next(v, &tp->task->signal->posix_timers, pos);
+ return seq_hlist_next(v, &tp->task->signal->posix_timers, pos);
}
static void timers_stop(struct seq_file *m, void *v)
@@ -2555,7 +2548,7 @@ static int show_timer(struct seq_file *m, void *v)
[SIGEV_THREAD] = "thread",
};
- timer = list_entry((struct list_head *)v, struct k_itimer, list);
+ timer = hlist_entry((struct hlist_node *)v, struct k_itimer, list);
notify = timer->it_sigev_notify;
seq_printf(m, "ID: %d\n", timer->it_id);
@@ -2633,10 +2626,11 @@ static ssize_t timerslack_ns_write(struct file *file, const char __user *buf,
}
task_lock(p);
- if (slack_ns == 0)
- p->timer_slack_ns = p->default_timer_slack_ns;
- else
- p->timer_slack_ns = slack_ns;
+ if (rt_or_dl_task_policy(p))
+ slack_ns = 0;
+ else if (slack_ns == 0)
+ slack_ns = p->default_timer_slack_ns;
+ p->timer_slack_ns = slack_ns;
task_unlock(p);
out:
@@ -2789,7 +2783,7 @@ static ssize_t proc_pid_attr_read(struct file * file, char __user * buf,
if (!task)
return -ESRCH;
- length = security_getprocattr(task, PROC_I(inode)->op.lsm,
+ length = security_getprocattr(task, PROC_I(inode)->op.lsmid,
file->f_path.dentry->d_name.name,
&p);
put_task_struct(task);
@@ -2847,7 +2841,7 @@ static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf,
if (rv < 0)
goto out_free;
- rv = security_setprocattr(PROC_I(inode)->op.lsm,
+ rv = security_setprocattr(PROC_I(inode)->op.lsmid,
file->f_path.dentry->d_name.name, page,
count);
mutex_unlock(&current->signal->cred_guard_mutex);
@@ -2896,27 +2890,27 @@ static const struct inode_operations proc_##LSM##_attr_dir_inode_ops = { \
#ifdef CONFIG_SECURITY_SMACK
static const struct pid_entry smack_attr_dir_stuff[] = {
- ATTR("smack", "current", 0666),
+ ATTR(LSM_ID_SMACK, "current", 0666),
};
LSM_DIR_OPS(smack);
#endif
#ifdef CONFIG_SECURITY_APPARMOR
static const struct pid_entry apparmor_attr_dir_stuff[] = {
- ATTR("apparmor", "current", 0666),
- ATTR("apparmor", "prev", 0444),
- ATTR("apparmor", "exec", 0666),
+ ATTR(LSM_ID_APPARMOR, "current", 0666),
+ ATTR(LSM_ID_APPARMOR, "prev", 0444),
+ ATTR(LSM_ID_APPARMOR, "exec", 0666),
};
LSM_DIR_OPS(apparmor);
#endif
static const struct pid_entry attr_dir_stuff[] = {
- ATTR(NULL, "current", 0666),
- ATTR(NULL, "prev", 0444),
- ATTR(NULL, "exec", 0666),
- ATTR(NULL, "fscreate", 0666),
- ATTR(NULL, "keycreate", 0666),
- ATTR(NULL, "sockcreate", 0666),
+ ATTR(LSM_ID_UNDEF, "current", 0666),
+ ATTR(LSM_ID_UNDEF, "prev", 0444),
+ ATTR(LSM_ID_UNDEF, "exec", 0666),
+ ATTR(LSM_ID_UNDEF, "fscreate", 0666),
+ ATTR(LSM_ID_UNDEF, "keycreate", 0666),
+ ATTR(LSM_ID_UNDEF, "sockcreate", 0666),
#ifdef CONFIG_SECURITY_SMACK
DIR("smack", 0555,
proc_smack_attr_dir_inode_ops, proc_smack_attr_dir_ops),
@@ -3035,8 +3029,7 @@ static const struct file_operations proc_coredump_filter_operations = {
#ifdef CONFIG_TASK_IO_ACCOUNTING
static int do_io_accounting(struct task_struct *task, struct seq_file *m, int whole)
{
- struct task_io_accounting acct = task->ioac;
- unsigned long flags;
+ struct task_io_accounting acct;
int result;
result = down_read_killable(&task->signal->exec_update_lock);
@@ -3048,15 +3041,28 @@ static int do_io_accounting(struct task_struct *task, struct seq_file *m, int wh
goto out_unlock;
}
- if (whole && lock_task_sighand(task, &flags)) {
- struct task_struct *t = task;
+ if (whole) {
+ struct signal_struct *sig = task->signal;
+ struct task_struct *t;
+ unsigned int seq = 1;
+ unsigned long flags;
+
+ rcu_read_lock();
+ do {
+ seq++; /* 2 on the 1st/lockless path, otherwise odd */
+ flags = read_seqbegin_or_lock_irqsave(&sig->stats_lock, &seq);
- task_io_accounting_add(&acct, &task->signal->ioac);
- while_each_thread(task, t)
- task_io_accounting_add(&acct, &t->ioac);
+ acct = sig->ioac;
+ __for_each_thread(sig, t)
+ task_io_accounting_add(&acct, &t->ioac);
- unlock_task_sighand(task, &flags);
+ } while (need_seqretry(&sig->stats_lock, seq));
+ done_seqretry_irqrestore(&sig->stats_lock, seq, flags);
+ rcu_read_unlock();
+ } else {
+ acct = task->ioac;
}
+
seq_printf(m,
"rchar: %llu\n"
"wchar: %llu\n"
@@ -3877,7 +3883,7 @@ static struct task_struct *first_tid(struct pid *pid, int tid, loff_t f_pos,
for_each_thread(task, pos) {
if (!nr--)
goto found;
- };
+ }
fail:
pos = NULL;
goto out;
@@ -3899,10 +3905,8 @@ static struct task_struct *next_tid(struct task_struct *start)
struct task_struct *pos = NULL;
rcu_read_lock();
if (pid_alive(start)) {
- pos = next_thread(start);
- if (thread_group_leader(pos))
- pos = NULL;
- else
+ pos = __next_thread(start);
+ if (pos)
get_task_struct(pos);
}
rcu_read_unlock();
@@ -3924,12 +3928,12 @@ static int proc_task_readdir(struct file *file, struct dir_context *ctx)
if (!dir_emit_dots(file, ctx))
return 0;
- /* f_version caches the tgid value that the last readdir call couldn't
- * return. lseek aka telldir automagically resets f_version to 0.
+ /* We cache the tgid value that the last readdir call couldn't
+ * return and lseek resets it to 0.
*/
ns = proc_pid_ns(inode->i_sb);
- tid = (int)file->f_version;
- file->f_version = 0;
+ tid = (int)(intptr_t)file->private_data;
+ file->private_data = NULL;
for (task = first_tid(proc_pid(inode), tid, ctx->pos - 2, ns);
task;
task = next_tid(task), ctx->pos++) {
@@ -3944,7 +3948,7 @@ static int proc_task_readdir(struct file *file, struct dir_context *ctx)
proc_task_instantiate, task, NULL)) {
/* returning this tgid failed, save it as the first
* pid for the next readir call */
- file->f_version = (u64)tid;
+ file->private_data = (void *)(intptr_t)tid;
put_task_struct(task);
break;
}
@@ -3969,6 +3973,24 @@ static int proc_task_getattr(struct mnt_idmap *idmap,
return 0;
}
+/*
+ * proc_task_readdir() set @file->private_data to a positive integer
+ * value, so casting that to u64 is safe. generic_llseek_cookie() will
+ * set @cookie to 0, so casting to an int is safe. The WARN_ON_ONCE() is
+ * here to catch any unexpected change in behavior either in
+ * proc_task_readdir() or generic_llseek_cookie().
+ */
+static loff_t proc_dir_llseek(struct file *file, loff_t offset, int whence)
+{
+ u64 cookie = (u64)(intptr_t)file->private_data;
+ loff_t off;
+
+ off = generic_llseek_cookie(file, offset, whence, &cookie);
+ WARN_ON_ONCE(cookie > INT_MAX);
+ file->private_data = (void *)(intptr_t)cookie; /* serialized by f_pos_lock */
+ return off;
+}
+
static const struct inode_operations proc_task_inode_operations = {
.lookup = proc_task_lookup,
.getattr = proc_task_getattr,
@@ -3979,7 +4001,7 @@ static const struct inode_operations proc_task_inode_operations = {
static const struct file_operations proc_task_operations = {
.read = generic_read_dir,
.iterate_shared = proc_task_readdir,
- .llseek = generic_file_llseek,
+ .llseek = proc_dir_llseek,
};
void __init set_proc_pid_nlink(void)
generated by cgit v1.2.3 (git 2.39.0) at 2025-08-29 14:16:36 +0300