Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

[cascardo/linux.git] / fs / proc / base.c

diff --git a/fs/proc/base.c b/fs/proc/base.c
index 029161d..c2964d8 100644 (file)
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -400,23 +400,6 @@ static const struct file_operations proc_pid_cmdline_ops = {
        .llseek = generic_file_llseek,
 };
 
-static int proc_pid_auxv(struct seq_file *m, struct pid_namespace *ns,
-                        struct pid *pid, struct task_struct *task)
-{
-       struct mm_struct *mm = mm_access(task, PTRACE_MODE_READ_FSCREDS);
-       if (mm && !IS_ERR(mm)) {
-               unsigned int nwords = 0;
-               do {
-                       nwords += 2;
-               } while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */
-               seq_write(m, mm->saved_auxv, nwords * sizeof(mm->saved_auxv[0]));
-               mmput(mm);
-               return 0;
-       } else
-               return PTR_ERR(mm);
-}
-
-
 #ifdef CONFIG_KALLSYMS
 /*
  * Provides a wchan file via kallsyms in a proper one-value-per-file format.
@@ -483,7 +466,7 @@ static int proc_pid_stack(struct seq_file *m, struct pid_namespace *ns,
                save_stack_trace_tsk(task, &trace);
 
                for (i = 0; i < trace.nr_entries; i++) {
-                       seq_printf(m, "[<%pK>] %pS\n",
+                       seq_printf(m, "[<%pK>] %pB\n",
                                   (void *)entries[i], (void *)entries[i]);
                }
                unlock_trace(task);
@@ -709,7 +692,7 @@ int proc_setattr(struct dentry *dentry, struct iattr *attr)
        if (attr->ia_valid & ATTR_MODE)
                return -EPERM;
 
-       error = inode_change_ok(inode, attr);
+       error = setattr_prepare(dentry, attr);
        if (error)
                return error;
 
@@ -1014,6 +997,30 @@ static const struct file_operations proc_environ_operations = {
        .release        = mem_release,
 };
 
+static int auxv_open(struct inode *inode, struct file *file)
+{
+       return __mem_open(inode, file, PTRACE_MODE_READ_FSCREDS);
+}
+
+static ssize_t auxv_read(struct file *file, char __user *buf,
+                       size_t count, loff_t *ppos)
+{
+       struct mm_struct *mm = file->private_data;
+       unsigned int nwords = 0;
+       do {
+               nwords += 2;
+       } while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */
+       return simple_read_from_buffer(buf, count, ppos, mm->saved_auxv,
+                                      nwords * sizeof(mm->saved_auxv[0]));
+}
+
+static const struct file_operations proc_auxv_operations = {
+       .open           = auxv_open,
+       .read           = auxv_read,
+       .llseek         = generic_file_llseek,
+       .release        = mem_release,
+};
+
 static ssize_t oom_adj_read(struct file *file, char __user *buf, size_t count,
                            loff_t *ppos)
 {
@@ -2280,16 +2287,27 @@ static ssize_t timerslack_ns_write(struct file *file, const char __user *buf,
        if (!p)
                return -ESRCH;
 
-       if (ptrace_may_access(p, PTRACE_MODE_ATTACH_FSCREDS)) {
-               task_lock(p);
-               if (slack_ns == 0)
-                       p->timer_slack_ns = p->default_timer_slack_ns;
-               else
-                       p->timer_slack_ns = slack_ns;
-               task_unlock(p);
-       } else
-               count = -EPERM;
+       if (p != current) {
+               if (!capable(CAP_SYS_NICE)) {
+                       count = -EPERM;
+                       goto out;
+               }
+
+               err = security_task_setscheduler(p);
+               if (err) {
+                       count = err;
+                       goto out;
+               }
+       }
+
+       task_lock(p);
+       if (slack_ns == 0)
+               p->timer_slack_ns = p->default_timer_slack_ns;
+       else
+               p->timer_slack_ns = slack_ns;
+       task_unlock(p);
 
+out:
        put_task_struct(p);
 
        return count;
@@ -2299,19 +2317,28 @@ static int timerslack_ns_show(struct seq_file *m, void *v)
 {
        struct inode *inode = m->private;
        struct task_struct *p;
-       int err =  0;
+       int err = 0;
 
        p = get_proc_task(inode);
        if (!p)
                return -ESRCH;
 
-       if (ptrace_may_access(p, PTRACE_MODE_ATTACH_FSCREDS)) {
-               task_lock(p);
-               seq_printf(m, "%llu\n", p->timer_slack_ns);
-               task_unlock(p);
-       } else
-               err = -EPERM;
+       if (p != current) {
+
+               if (!capable(CAP_SYS_NICE)) {
+                       err = -EPERM;
+                       goto out;
+               }
+               err = security_task_getscheduler(p);
+               if (err)
+                       goto out;
+       }
 
+       task_lock(p);
+       seq_printf(m, "%llu\n", p->timer_slack_ns);
+       task_unlock(p);
+
+out:
        put_task_struct(p);
 
        return err;
@@ -2822,7 +2849,7 @@ static const struct pid_entry tgid_base_stuff[] = {
        DIR("net",        S_IRUGO|S_IXUGO, proc_net_inode_operations, proc_net_operations),
 #endif
        REG("environ",    S_IRUSR, proc_environ_operations),
-       ONE("auxv",       S_IRUSR, proc_pid_auxv),
+       REG("auxv",       S_IRUSR, proc_auxv_operations),
        ONE("status",     S_IRUGO, proc_pid_status),
        ONE("personality", S_IRUSR, proc_pid_personality),
        ONE("limits",     S_IRUGO, proc_pid_limits),
@@ -3210,7 +3237,7 @@ static const struct pid_entry tid_base_stuff[] = {
        DIR("net",        S_IRUGO|S_IXUGO, proc_net_inode_operations, proc_net_operations),
 #endif
        REG("environ",   S_IRUSR, proc_environ_operations),
-       ONE("auxv",      S_IRUSR, proc_pid_auxv),
+       REG("auxv",      S_IRUSR, proc_auxv_operations),
        ONE("status",    S_IRUGO, proc_pid_status),
        ONE("personality", S_IRUSR, proc_pid_personality),
        ONE("limits",    S_IRUGO, proc_pid_limits),