The patch titled
Subject: proc/maps: make vm_is_stack() logic namespace-friendly
has been added to the -mm tree. Its filename is
proc-maps-make-vm_is_stack-logic-namespace-friendly.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/proc-maps-make-vm_is_stack-logic-namespace-friendly.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/proc-maps-make-vm_is_stack-logic-namespace-friendly.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
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------------------------------------------------------
From: Oleg Nesterov <oleg@xxxxxxxxxx>
Subject: proc/maps: make vm_is_stack() logic namespace-friendly
- Rename vm_is_stack() to task_of_stack() and change it to return
"struct task_struct *" rather than the global (and thus wrong in
general) pid_t.
- Add the new pid_of_stack() helper which calls task_of_stack() and
uses the right namespace to report the correct pid_t.
Unfortunately we need to define this helper twice, in task_mmu.c
and in task_nommu.c. perhaps it makes sense to add fs/proc/util.c
and move at least pid_of_stack/task_of_stack there to avoid the
code duplication.
- Change show_map_vma() and show_numa_map() to use the new helper.
Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Cyrill Gorcunov <gorcunov@xxxxxxxxxx>
Cc: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
Cc: Greg Ungerer <gerg@xxxxxxxxxxx>
Cc: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/proc/task_mmu.c | 25 +++++++++++++++++++++----
fs/proc/task_nommu.c | 21 ++++++++++++++++++++-
include/linux/mm.h | 4 ++--
mm/util.c | 23 ++++++++---------------
4 files changed, 51 insertions(+), 22 deletions(-)
diff -puN fs/proc/task_mmu.c~proc-maps-make-vm_is_stack-logic-namespace-friendly fs/proc/task_mmu.c
--- a/fs/proc/task_mmu.c~proc-maps-make-vm_is_stack-logic-namespace-friendly
+++ a/fs/proc/task_mmu.c
@@ -262,13 +262,31 @@ static int do_maps_open(struct inode *in
sizeof(struct proc_maps_private));
}
+static pid_t pid_of_stack(struct proc_maps_private *priv,
+ struct vm_area_struct *vma, bool is_pid)
+{
+ struct inode *inode = priv->inode;
+ struct task_struct *task;
+ pid_t ret = 0;
+
+ rcu_read_lock();
+ task = pid_task(proc_pid(inode), PIDTYPE_PID);
+ if (task) {
+ task = task_of_stack(task, vma, is_pid);
+ if (task)
+ ret = task_pid_nr_ns(task, inode->i_sb->s_fs_info);
+ }
+ rcu_read_unlock();
+
+ return ret;
+}
+
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;
@@ -333,8 +351,7 @@ show_map_vma(struct seq_file *m, struct
goto done;
}
- tid = vm_is_stack(task, vma, is_pid);
-
+ tid = pid_of_stack(priv, vma, is_pid);
if (tid != 0) {
/*
* Thread stack in /proc/PID/task/TID/maps or
@@ -1438,7 +1455,7 @@ static int show_numa_map(struct seq_file
} else if (vma->vm_start <= mm->brk && vma->vm_end >= mm->start_brk) {
seq_puts(m, " heap");
} else {
- pid_t tid = vm_is_stack(task, vma, is_pid);
+ pid_t tid = pid_of_stack(proc_priv, vma, is_pid);
if (tid != 0) {
/*
* Thread stack in /proc/PID/task/TID/maps or
diff -puN fs/proc/task_nommu.c~proc-maps-make-vm_is_stack-logic-namespace-friendly fs/proc/task_nommu.c
--- a/fs/proc/task_nommu.c~proc-maps-make-vm_is_stack-logic-namespace-friendly
+++ a/fs/proc/task_nommu.c
@@ -123,6 +123,25 @@ unsigned long task_statm(struct mm_struc
return size;
}
+static pid_t pid_of_stack(struct proc_maps_private *priv,
+ struct vm_area_struct *vma, bool is_pid)
+{
+ struct inode *inode = priv->inode;
+ struct task_struct *task;
+ pid_t ret = 0;
+
+ rcu_read_lock();
+ task = pid_task(proc_pid(inode), PIDTYPE_PID);
+ if (task) {
+ task = task_of_stack(task, vma, is_pid);
+ if (task)
+ ret = task_pid_nr_ns(task, inode->i_sb->s_fs_info);
+ }
+ rcu_read_unlock();
+
+ return ret;
+}
+
/*
* display a single VMA to a sequenced file
*/
@@ -163,7 +182,7 @@ static int nommu_vma_show(struct seq_fil
seq_pad(m, ' ');
seq_path(m, &file->f_path, "");
} else if (mm) {
- pid_t tid = vm_is_stack(priv->task, vma, is_pid);
+ pid_t tid = pid_of_stack(priv, vma, is_pid);
if (tid != 0) {
seq_pad(m, ' ');
diff -puN include/linux/mm.h~proc-maps-make-vm_is_stack-logic-namespace-friendly include/linux/mm.h
--- a/include/linux/mm.h~proc-maps-make-vm_is_stack-logic-namespace-friendly
+++ a/include/linux/mm.h
@@ -1248,8 +1248,8 @@ static inline int stack_guard_page_end(s
!vma_growsup(vma->vm_next, addr);
}
-extern pid_t
-vm_is_stack(struct task_struct *task, struct vm_area_struct *vma, int in_group);
+extern struct task_struct *task_of_stack(struct task_struct *task,
+ struct vm_area_struct *vma, bool in_group);
extern unsigned long move_page_tables(struct vm_area_struct *vma,
unsigned long old_addr, struct vm_area_struct *new_vma,
diff -puN mm/util.c~proc-maps-make-vm_is_stack-logic-namespace-friendly mm/util.c
--- a/mm/util.c~proc-maps-make-vm_is_stack-logic-namespace-friendly
+++ a/mm/util.c
@@ -200,32 +200,25 @@ static int vm_is_stack_for_task(struct t
/*
* Check if the vma is being used as a stack.
* If is_group is non-zero, check in the entire thread group or else
- * just check in the current task. Returns the pid of the task that
- * the vma is stack for.
+ * just check in the current task. Returns the task_struct of the task
+ * that the vma is stack for. Must be called under rcu_read_lock().
*/
-pid_t vm_is_stack(struct task_struct *task,
- struct vm_area_struct *vma, int in_group)
+struct task_struct *task_of_stack(struct task_struct *task,
+ struct vm_area_struct *vma, bool in_group)
{
- pid_t ret = 0;
-
if (vm_is_stack_for_task(task, vma))
- return task->pid;
+ return task;
if (in_group) {
struct task_struct *t;
- rcu_read_lock();
for_each_thread(task, t) {
- if (vm_is_stack_for_task(t, vma)) {
- ret = t->pid;
- goto done;
- }
+ if (vm_is_stack_for_task(t, vma))
+ return t;
}
-done:
- rcu_read_unlock();
}
- return ret;
+ return NULL;
}
#if defined(CONFIG_MMU) && !defined(HAVE_ARCH_PICK_MMAP_LAYOUT)
_
Patches currently in -mm which might be from oleg@xxxxxxxxxx are
prctl-pr_set_mm-introduce-pr_set_mm_map-operation-v4.patch
earlyprintk-re-enable-earlyprintk-calling-early_param.patch
fs-proc-task_mmuc-dont-use-task-mm-in-m_start-and-show_map.patch
fs-proc-task_mmuc-unify-simplify-do_maps_open-and-numa_maps_open.patch
proc-introduce-proc_mem_open.patch
fs-proc-task_mmuc-shift-mm_access-from-m_start-to-proc_maps_open.patch
fs-proc-task_mmuc-shift-mm_access-from-m_start-to-proc_maps_open-checkpatch-fixes.patch
fs-proc-task_mmuc-simplify-the-vma_stop-logic.patch
fs-proc-task_mmuc-simplify-the-vma_stop-logic-checkpatch-fixes.patch
fs-proc-task_mmuc-cleanup-the-tail_vma-horror-in-m_next.patch
fs-proc-task_mmuc-shift-priv-task-=-null-from-m_start-to-m_stop.patch
fs-proc-task_mmuc-kill-the-suboptimal-and-confusing-m-version-logic.patch
fs-proc-task_mmuc-simplify-m_start-to-make-it-readable.patch
fs-proc-task_mmuc-introduce-m_next_vma-helper.patch
fs-proc-task_mmuc-reintroduce-m-version-logic.patch
fs-proc-task_mmuc-update-m-version-in-the-main-loop-in-m_start.patch
fs-proc-task_nommuc-change-maps_open-to-use-__seq_open_private.patch
fs-proc-task_nommuc-shift-mm_access-from-m_start-to-proc_maps_open.patch
fs-proc-task_nommuc-shift-mm_access-from-m_start-to-proc_maps_open-checkpatch-fixes.patch
fs-proc-task_nommuc-dont-use-priv-task-mm.patch
proc-maps-replace-proc_maps_private-pid-with-struct-inode-inode.patch
proc-maps-make-vm_is_stack-logic-namespace-friendly.patch
ipc-shm-kill-the-historical-wrong-mm-start_stack-check.patch
linux-next.patch
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