4 files changed, 239 insertions, 61 deletions

diff --git a/fs/proc/base.c b/fs/proc/base.c
index 965d4bde3a3b..3b42c1418f31 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -2989,9 +2989,9 @@ static const struct pid_entry tgid_base_stuff[] = {
         INF("cmdline",    S_IRUGO, proc_pid_cmdline),
         ONE("stat",       S_IRUGO, proc_tgid_stat),
         ONE("statm",      S_IRUGO, proc_pid_statm),
-        REG("maps",       S_IRUGO, proc_maps_operations),
+        REG("maps",       S_IRUGO, proc_pid_maps_operations),
 #ifdef CONFIG_NUMA
-        REG("numa_maps",  S_IRUGO, proc_numa_maps_operations),
+        REG("numa_maps",  S_IRUGO, proc_pid_numa_maps_operations),
 #endif
         REG("mem",        S_IRUSR|S_IWUSR, proc_mem_operations),
         LNK("cwd",        proc_cwd_link),
@@ -3002,7 +3002,7 @@ static const struct pid_entry tgid_base_stuff[] = {
         REG("mountstats", S_IRUSR, proc_mountstats_operations),
 #ifdef CONFIG_PROC_PAGE_MONITOR
         REG("clear_refs", S_IWUSR, proc_clear_refs_operations),
-        REG("smaps",      S_IRUGO, proc_smaps_operations),
+        REG("smaps",      S_IRUGO, proc_pid_smaps_operations),
         REG("pagemap",    S_IRUGO, proc_pagemap_operations),
 #endif
 #ifdef CONFIG_SECURITY
@@ -3348,9 +3348,9 @@ static const struct pid_entry tid_base_stuff[] = {
         INF("cmdline",   S_IRUGO, proc_pid_cmdline),
         ONE("stat",      S_IRUGO, proc_tid_stat),
         ONE("statm",     S_IRUGO, proc_pid_statm),
-        REG("maps",      S_IRUGO, proc_maps_operations),
+        REG("maps",      S_IRUGO, proc_tid_maps_operations),
 #ifdef CONFIG_NUMA
-        REG("numa_maps", S_IRUGO, proc_numa_maps_operations),
+        REG("numa_maps", S_IRUGO, proc_tid_numa_maps_operations),
 #endif
         REG("mem",       S_IRUSR|S_IWUSR, proc_mem_operations),
         LNK("cwd",       proc_cwd_link),
@@ -3360,7 +3360,7 @@ static const struct pid_entry tid_base_stuff[] = {
         REG("mountinfo",  S_IRUGO, proc_mountinfo_operations),
 #ifdef CONFIG_PROC_PAGE_MONITOR
         REG("clear_refs", S_IWUSR, proc_clear_refs_operations),
-        REG("smaps",     S_IRUGO, proc_smaps_operations),
+        REG("smaps",     S_IRUGO, proc_tid_smaps_operations),
         REG("pagemap",    S_IRUGO, proc_pagemap_operations),
 #endif
 #ifdef CONFIG_SECURITY
diff --git a/fs/proc/internal.h b/fs/proc/internal.h
index 292577531ad1..c44efe19798f 100644
--- a/fs/proc/internal.h
+++ b/fs/proc/internal.h
@@ -53,9 +53,12 @@ extern int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns,
                                 struct pid *pid, struct task_struct *task);
 extern loff_t mem_lseek(struct file *file, loff_t offset, int orig);
 
-extern const struct file_operations proc_maps_operations;
-extern const struct file_operations proc_numa_maps_operations;
-extern const struct file_operations proc_smaps_operations;
+extern const struct file_operations proc_pid_maps_operations;
+extern const struct file_operations proc_tid_maps_operations;
+extern const struct file_operations proc_pid_numa_maps_operations;
+extern const struct file_operations proc_tid_numa_maps_operations;
+extern const struct file_operations proc_pid_smaps_operations;
+extern const struct file_operations proc_tid_smaps_operations;
 extern const struct file_operations proc_clear_refs_operations;
 extern const struct file_operations proc_pagemap_operations;
 extern const struct file_operations proc_net_operations;
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index c7e3a163295c..9694cc283511 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -209,16 +209,20 @@ static int do_maps_open(struct inode *inode, struct file *file,
         return ret;
 }
 
-static void show_map_vma(struct seq_file *m, struct vm_area_struct *vma)
+static void
+show_map_vma(struct seq_file *m, struct vm_area_struct *vma, int is_pid)
 {
         struct mm_struct *mm = vma->vm_mm;
         struct file *file = vma->vm_file;
+        struct proc_maps_private *priv = m->private;
+        struct task_struct *task = priv->task;
         vm_flags_t flags = vma->vm_flags;
         unsigned long ino = 0;
         unsigned long long pgoff = 0;
         unsigned long start, end;
         dev_t dev = 0;
         int len;
+        const char *name = NULL;
 
         if (file) {
                 struct inode *inode = vma->vm_file->f_path.dentry->d_inode;
@@ -252,36 +256,57 @@ static void show_map_vma(struct seq_file *m, struct vm_area_struct *vma)
         if (file) {
                 pad_len_spaces(m, len);
                 seq_path(m, &file->f_path, "\n");
-        } else {
-                const char *name = arch_vma_name(vma);
-                if (!name) {
-                        if (mm) {
-                                if (vma->vm_start <= mm->brk &&
-                                                vma->vm_end >= mm->start_brk) {
-                                        name = "[heap]";
-                                } else if (vma->vm_start <= mm->start_stack &&
-                                           vma->vm_end >= mm->start_stack) {
-                                        name = "[stack]";
-                                }
+                goto done;
+        }
+
+        name = arch_vma_name(vma);
+        if (!name) {
+                pid_t tid;
+
+                if (!mm) {
+                        name = "[vdso]";
+                        goto done;
+                }
+
+                if (vma->vm_start <= mm->brk &&
+                    vma->vm_end >= mm->start_brk) {
+                        name = "[heap]";
+                        goto done;
+                }
+
+                tid = vm_is_stack(task, vma, is_pid);
+
+                if (tid != 0) {
+                        /*
+                         * Thread stack in /proc/PID/task/TID/maps or
+                         * the main process stack.
+                         */
+                        if (!is_pid || (vma->vm_start <= mm->start_stack &&
+                            vma->vm_end >= mm->start_stack)) {
+                                name = "[stack]";
                         } else {
-                                name = "[vdso]";
+                                /* Thread stack in /proc/PID/maps */
+                                pad_len_spaces(m, len);
+                                seq_printf(m, "[stack:%d]", tid);
                         }
                 }
-                if (name) {
-                        pad_len_spaces(m, len);
-                        seq_puts(m, name);
-                }
+        }
+
+done:
+        if (name) {
+                pad_len_spaces(m, len);
+                seq_puts(m, name);
         }
         seq_putc(m, '\n');
 }
 
-static int show_map(struct seq_file *m, void *v)
+static int show_map(struct seq_file *m, void *v, int is_pid)
 {
         struct vm_area_struct *vma = v;
         struct proc_maps_private *priv = m->private;
         struct task_struct *task = priv->task;
 
-        show_map_vma(m, vma);
+        show_map_vma(m, vma, is_pid);
 
         if (m->count < m->size)  /* vma is copied successfully */
                 m->version = (vma != get_gate_vma(task->mm))
@@ -289,20 +314,49 @@ static int show_map(struct seq_file *m, void *v)
         return 0;
 }
 
+static int show_pid_map(struct seq_file *m, void *v)
+{
+        return show_map(m, v, 1);
+}
+
+static int show_tid_map(struct seq_file *m, void *v)
+{
+        return show_map(m, v, 0);
+}
+
 static const struct seq_operations proc_pid_maps_op = {
         .start  = m_start,
         .next   = m_next,
         .stop   = m_stop,
-        .show   = show_map
+        .show   = show_pid_map
+};
+
+static const struct seq_operations proc_tid_maps_op = {
+        .start  = m_start,
+        .next   = m_next,
+        .stop   = m_stop,
+        .show   = show_tid_map
 };
 
-static int maps_open(struct inode *inode, struct file *file)
+static int pid_maps_open(struct inode *inode, struct file *file)
 {
         return do_maps_open(inode, file, &proc_pid_maps_op);
 }
 
-const struct file_operations proc_maps_operations = {
-        .open           = maps_open,
+static int tid_maps_open(struct inode *inode, struct file *file)
+{
+        return do_maps_open(inode, file, &proc_tid_maps_op);
+}
+
+const struct file_operations proc_pid_maps_operations = {
+        .open           = pid_maps_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = seq_release_private,
+};
+
+const struct file_operations proc_tid_maps_operations = {
+        .open           = tid_maps_open,
         .read           = seq_read,
         .llseek         = seq_lseek,
         .release        = seq_release_private,
@@ -416,7 +470,7 @@ static int smaps_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
         return 0;
 }
 
-static int show_smap(struct seq_file *m, void *v)
+static int show_smap(struct seq_file *m, void *v, int is_pid)
 {
         struct proc_maps_private *priv = m->private;
         struct task_struct *task = priv->task;
@@ -434,7 +488,7 @@ static int show_smap(struct seq_file *m, void *v)
         if (vma->vm_mm && !is_vm_hugetlb_page(vma))
                 walk_page_range(vma->vm_start, vma->vm_end, &smaps_walk);
 
-        show_map_vma(m, vma);
+        show_map_vma(m, vma, is_pid);
 
         seq_printf(m,
                    "Size:           %8lu kB\n"
@@ -473,20 +527,49 @@ static int show_smap(struct seq_file *m, void *v)
         return 0;
 }
 
+static int show_pid_smap(struct seq_file *m, void *v)
+{
+        return show_smap(m, v, 1);
+}
+
+static int show_tid_smap(struct seq_file *m, void *v)
+{
+        return show_smap(m, v, 0);
+}
+
 static const struct seq_operations proc_pid_smaps_op = {
         .start  = m_start,
         .next   = m_next,
         .stop   = m_stop,
-        .show   = show_smap
+        .show   = show_pid_smap
+};
+
+static const struct seq_operations proc_tid_smaps_op = {
+        .start  = m_start,
+        .next   = m_next,
+        .stop   = m_stop,
+        .show   = show_tid_smap
 };
 
-static int smaps_open(struct inode *inode, struct file *file)
+static int pid_smaps_open(struct inode *inode, struct file *file)
 {
         return do_maps_open(inode, file, &proc_pid_smaps_op);
 }
 
-const struct file_operations proc_smaps_operations = {
-        .open           = smaps_open,
+static int tid_smaps_open(struct inode *inode, struct file *file)
+{
+        return do_maps_open(inode, file, &proc_tid_smaps_op);
+}
+
+const struct file_operations proc_pid_smaps_operations = {
+        .open           = pid_smaps_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = seq_release_private,
+};
+
+const struct file_operations proc_tid_smaps_operations = {
+        .open           = tid_smaps_open,
         .read           = seq_read,
         .llseek         = seq_lseek,
         .release        = seq_release_private,
@@ -1039,7 +1122,7 @@ static int gather_hugetbl_stats(pte_t *pte, unsigned long hmask,
 /*
  * Display pages allocated per node and memory policy via /proc.
  */
-static int show_numa_map(struct seq_file *m, void *v)
+static int show_numa_map(struct seq_file *m, void *v, int is_pid)
 {
         struct numa_maps_private *numa_priv = m->private;
         struct proc_maps_private *proc_priv = &numa_priv->proc_maps;
@@ -1076,9 +1159,19 @@ static int show_numa_map(struct seq_file *m, void *v)
                 seq_path(m, &file->f_path, "\n\t= ");
         } else if (vma->vm_start <= mm->brk && vma->vm_end >= mm->start_brk) {
                 seq_printf(m, " heap");
-        } else if (vma->vm_start <= mm->start_stack &&
-                        vma->vm_end >= mm->start_stack) {
-                seq_printf(m, " stack");
+        } else {
+                pid_t tid = vm_is_stack(proc_priv->task, vma, is_pid);
+                if (tid != 0) {
+                        /*
+                         * Thread stack in /proc/PID/task/TID/maps or
+                         * the main process stack.
+                         */
+                        if (!is_pid || (vma->vm_start <= mm->start_stack &&
+                            vma->vm_end >= mm->start_stack))
+                                seq_printf(m, " stack");
+                        else
+                                seq_printf(m, " stack:%d", tid);
+                }
         }
 
         if (is_vm_hugetlb_page(vma))
@@ -1121,21 +1214,39 @@ out:
         return 0;
 }
 
+static int show_pid_numa_map(struct seq_file *m, void *v)
+{
+        return show_numa_map(m, v, 1);
+}
+
+static int show_tid_numa_map(struct seq_file *m, void *v)
+{
+        return show_numa_map(m, v, 0);
+}
+
 static const struct seq_operations proc_pid_numa_maps_op = {
-        .start  = m_start,
-        .next   = m_next,
-        .stop   = m_stop,
-        .show   = show_numa_map,
+        .start  = m_start,
+        .next   = m_next,
+        .stop   = m_stop,
+        .show   = show_pid_numa_map,
 };
 
-static int numa_maps_open(struct inode *inode, struct file *file)
+static const struct seq_operations proc_tid_numa_maps_op = {
+        .start  = m_start,
+        .next   = m_next,
+        .stop   = m_stop,
+        .show   = show_tid_numa_map,
+};
+
+static int numa_maps_open(struct inode *inode, struct file *file,
+                          const struct seq_operations *ops)
 {
         struct numa_maps_private *priv;
         int ret = -ENOMEM;
         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
         if (priv) {
                 priv->proc_maps.pid = proc_pid(inode);
-                ret = seq_open(file, &proc_pid_numa_maps_op);
+                ret = seq_open(file, ops);
                 if (!ret) {
                         struct seq_file *m = file->private_data;
                         m->private = priv;
@@ -1146,8 +1257,25 @@ static int numa_maps_open(struct inode *inode, struct file *file)
         return ret;
 }
 
-const struct file_operations proc_numa_maps_operations = {
-        .open           = numa_maps_open,
+static int pid_numa_maps_open(struct inode *inode, struct file *file)
+{
+        return numa_maps_open(inode, file, &proc_pid_numa_maps_op);
+}
+
+static int tid_numa_maps_open(struct inode *inode, struct file *file)
+{
+        return numa_maps_open(inode, file, &proc_tid_numa_maps_op);
+}
+
+const struct file_operations proc_pid_numa_maps_operations = {
+        .open           = pid_numa_maps_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = seq_release_private,
+};
+
+const struct file_operations proc_tid_numa_maps_operations = {
+        .open           = tid_numa_maps_open,
         .read           = seq_read,
         .llseek         = seq_lseek,
         .release        = seq_release_private,
diff --git a/fs/proc/task_nommu.c b/fs/proc/task_nommu.c
index 980de547c070..74fe164d1b23 100644
--- a/fs/proc/task_nommu.c
+++ b/fs/proc/task_nommu.c
@@ -134,9 +134,11 @@ static void pad_len_spaces(struct seq_file *m, int len)
 /*
  * display a single VMA to a sequenced file
  */
-static int nommu_vma_show(struct seq_file *m, struct vm_area_struct *vma)
+static int nommu_vma_show(struct seq_file *m, struct vm_area_struct *vma,
+                          int is_pid)
 {
         struct mm_struct *mm = vma->vm_mm;
+        struct proc_maps_private *priv = m->private;
         unsigned long ino = 0;
         struct file *file;
         dev_t dev = 0;
@@ -168,10 +170,19 @@ static int nommu_vma_show(struct seq_file *m, struct vm_area_struct *vma)
                 pad_len_spaces(m, len);
                 seq_path(m, &file->f_path, "");
         } else if (mm) {
-                if (vma->vm_start <= mm->start_stack &&
-                        vma->vm_end >= mm->start_stack) {
+                pid_t tid = vm_is_stack(priv->task, vma, is_pid);
+
+                if (tid != 0) {
                         pad_len_spaces(m, len);
-                        seq_puts(m, "[stack]");
+                        /*
+                         * Thread stack in /proc/PID/task/TID/maps or
+                         * the main process stack.
+                         */
+                        if (!is_pid || (vma->vm_start <= mm->start_stack &&
+                            vma->vm_end >= mm->start_stack))
+                                seq_printf(m, "[stack]");
+                        else
+                                seq_printf(m, "[stack:%d]", tid);
                 }
         }
 
@@ -182,11 +193,22 @@ static int nommu_vma_show(struct seq_file *m, struct vm_area_struct *vma)
 /*
  * display mapping lines for a particular process's /proc/pid/maps
  */
-static int show_map(struct seq_file *m, void *_p)
+static int show_map(struct seq_file *m, void *_p, int is_pid)
 {
         struct rb_node *p = _p;
 
-        return nommu_vma_show(m, rb_entry(p, struct vm_area_struct, vm_rb));
+        return nommu_vma_show(m, rb_entry(p, struct vm_area_struct, vm_rb),
+                              is_pid);
+}
+
+static int show_pid_map(struct seq_file *m, void *_p)
+{
+        return show_map(m, _p, 1);
+}
+
+static int show_tid_map(struct seq_file *m, void *_p)
+{
+        return show_map(m, _p, 0);
 }
 
 static void *m_start(struct seq_file *m, loff_t *pos)
@@ -240,10 +262,18 @@ static const struct seq_operations proc_pid_maps_ops = {
         .start  = m_start,
         .next   = m_next,
         .stop   = m_stop,
-        .show   = show_map
+        .show   = show_pid_map
+};
+
+static const struct seq_operations proc_tid_maps_ops = {
+        .start  = m_start,
+        .next   = m_next,
+        .stop   = m_stop,
+        .show   = show_tid_map
 };
 
-static int maps_open(struct inode *inode, struct file *file)
+static int maps_open(struct inode *inode, struct file *file,
+                     const struct seq_operations *ops)
 {
         struct proc_maps_private *priv;
         int ret = -ENOMEM;
@@ -251,7 +281,7 @@ static int maps_open(struct inode *inode, struct file *file)
         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
         if (priv) {
                 priv->pid = proc_pid(inode);
-                ret = seq_open(file, &proc_pid_maps_ops);
+                ret = seq_open(file, ops);
                 if (!ret) {
                         struct seq_file *m = file->private_data;
                         m->private = priv;
@@ -262,8 +292,25 @@ static int maps_open(struct inode *inode, struct file *file)
         return ret;
 }
 
-const struct file_operations proc_maps_operations = {
-        .open           = maps_open,
+static int pid_maps_open(struct inode *inode, struct file *file)
+{
+        return maps_open(inode, file, &proc_pid_maps_ops);
+}
+
+static int tid_maps_open(struct inode *inode, struct file *file)
+{
+        return maps_open(inode, file, &proc_tid_maps_ops);
+}
+
+const struct file_operations proc_pid_maps_operations = {
+        .open           = pid_maps_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = seq_release_private,
+};
+
+const struct file_operations proc_tid_maps_operations = {
+        .open           = tid_maps_open,
         .read           = seq_read,
         .llseek         = seq_lseek,
         .release        = seq_release_private,