#include <linux/mount.h>
#include <linux/seq_file.h>
#include <linux/highmem.h>
+#include <linux/ptrace.h>
#include <linux/pagemap.h>
#include <linux/mempolicy.h>
dev_t dev = 0;
int len;
+ if (maps_protect && !ptrace_may_attach(task))
+ return -EACCES;
+
if (file) {
struct inode *inode = vma->vm_file->f_path.dentry->d_inode;
dev = inode->i_sb->s_dev;
"Shared_Dirty: %8lu kB\n"
"Private_Clean: %8lu kB\n"
"Private_Dirty: %8lu kB\n"
- "Pgs_Referenced: %8lu kB\n",
+ "Referenced: %8lu kB\n",
(vma->vm_end - vma->vm_start) >> 10,
mss->resident >> 10,
mss->shared_clean >> 10,
return show_map_internal(m, v, NULL);
}
-static void smaps_one_pmd(struct vm_area_struct *vma, pmd_t *pmd,
- unsigned long addr, unsigned long end,
- void *private)
+static void smaps_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
+ unsigned long addr, unsigned long end,
+ void *private)
{
struct mem_size_stats *mss = private;
pte_t *pte, ptent;
cond_resched();
}
-static inline void for_each_pmd_in_pud(struct pmd_walker *walker, pud_t *pud,
- unsigned long addr, unsigned long end)
+static void clear_refs_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
+ unsigned long addr, unsigned long end,
+ void *private)
+{
+ pte_t *pte, ptent;
+ spinlock_t *ptl;
+ struct page *page;
+
+ pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
+ for (; addr != end; pte++, addr += PAGE_SIZE) {
+ ptent = *pte;
+ if (!pte_present(ptent))
+ continue;
+
+ page = vm_normal_page(vma, addr, ptent);
+ if (!page)
+ continue;
+
+ /* Clear accessed and referenced bits. */
+ ptep_test_and_clear_young(vma, addr, pte);
+ ClearPageReferenced(page);
+ }
+ pte_unmap_unlock(pte - 1, ptl);
+ cond_resched();
+}
+
+static inline void walk_pmd_range(struct pmd_walker *walker, pud_t *pud,
+ unsigned long addr, unsigned long end)
{
pmd_t *pmd;
unsigned long next;
}
}
-static inline void for_each_pud_in_pgd(struct pmd_walker *walker, pgd_t *pgd,
- unsigned long addr, unsigned long end)
+static inline void walk_pud_range(struct pmd_walker *walker, pgd_t *pgd,
+ unsigned long addr, unsigned long end)
{
pud_t *pud;
unsigned long next;
next = pud_addr_end(addr, end);
if (pud_none_or_clear_bad(pud))
continue;
- for_each_pmd_in_pud(walker, pud, addr, next);
+ walk_pmd_range(walker, pud, addr, next);
}
}
-static inline void for_each_pmd(struct vm_area_struct *vma,
- void (*action)(struct vm_area_struct *, pmd_t *,
- unsigned long, unsigned long,
- void *),
- void *private)
+/*
+ * walk_page_range - walk the page tables of a VMA with a callback
+ * @vma - VMA to walk
+ * @action - callback invoked for every bottom-level (PTE) page table
+ * @private - private data passed to the callback function
+ *
+ * Recursively walk the page table for the memory area in a VMA, calling
+ * a callback for every bottom-level (PTE) page table.
+ */
+static inline void walk_page_range(struct vm_area_struct *vma,
+ void (*action)(struct vm_area_struct *,
+ pmd_t *, unsigned long,
+ unsigned long, void *),
+ void *private)
{
unsigned long addr = vma->vm_start;
unsigned long end = vma->vm_end;
next = pgd_addr_end(addr, end);
if (pgd_none_or_clear_bad(pgd))
continue;
- for_each_pud_in_pgd(&walker, pgd, addr, next);
+ walk_pud_range(&walker, pgd, addr, next);
}
}
memset(&mss, 0, sizeof mss);
if (vma->vm_mm && !is_vm_hugetlb_page(vma))
- for_each_pmd(vma, smaps_one_pmd, &mss);
+ walk_page_range(vma, smaps_pte_range, &mss);
return show_map_internal(m, v, &mss);
}
+void clear_refs_smap(struct mm_struct *mm)
+{
+ struct vm_area_struct *vma;
+
+ down_read(&mm->mmap_sem);
+ for (vma = mm->mmap; vma; vma = vma->vm_next)
+ if (vma->vm_mm && !is_vm_hugetlb_page(vma))
+ walk_page_range(vma, clear_refs_pte_range, NULL);
+ flush_tlb_mm(mm);
+ up_read(&mm->mmap_sem);
+}
+
static void *m_start(struct seq_file *m, loff_t *pos)
{
struct proc_maps_private *priv = m->private;
#ifdef CONFIG_NUMA
extern int show_numa_map(struct seq_file *m, void *v);
+static int show_numa_map_checked(struct seq_file *m, void *v)
+{
+ struct proc_maps_private *priv = m->private;
+ struct task_struct *task = priv->task;
+
+ if (maps_protect && !ptrace_may_attach(task))
+ return -EACCES;
+
+ return show_numa_map(m, v);
+}
+
static struct seq_operations proc_pid_numa_maps_op = {
.start = m_start,
.next = m_next,
.stop = m_stop,
- .show = show_numa_map
+ .show = show_numa_map_checked
};
static int numa_maps_open(struct inode *inode, struct file *file)