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path: root/fs/proc/task_mmu.c
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Diffstat (limited to 'fs/proc/task_mmu.c')
-rw-r--r--fs/proc/task_mmu.c72
1 files changed, 38 insertions, 34 deletions
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 05053d701ac..c492449f3b4 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -602,11 +602,6 @@ static int pagemap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
return err;
}
-static struct mm_walk pagemap_walk = {
- .pmd_entry = pagemap_pte_range,
- .pte_hole = pagemap_pte_hole
-};
-
/*
* /proc/pid/pagemap - an array mapping virtual pages to pfns
*
@@ -641,6 +636,11 @@ static ssize_t pagemap_read(struct file *file, char __user *buf,
struct pagemapread pm;
int pagecount;
int ret = -ESRCH;
+ struct mm_walk pagemap_walk;
+ unsigned long src;
+ unsigned long svpfn;
+ unsigned long start_vaddr;
+ unsigned long end_vaddr;
if (!task)
goto out;
@@ -659,11 +659,15 @@ static ssize_t pagemap_read(struct file *file, char __user *buf,
if (!mm)
goto out_task;
- ret = -ENOMEM;
+
uaddr = (unsigned long)buf & PAGE_MASK;
uend = (unsigned long)(buf + count);
pagecount = (PAGE_ALIGN(uend) - uaddr) / PAGE_SIZE;
- pages = kmalloc(pagecount * sizeof(struct page *), GFP_KERNEL);
+ ret = 0;
+ if (pagecount == 0)
+ goto out_mm;
+ pages = kcalloc(pagecount, sizeof(struct page *), GFP_KERNEL);
+ ret = -ENOMEM;
if (!pages)
goto out_mm;
@@ -684,33 +688,33 @@ static ssize_t pagemap_read(struct file *file, char __user *buf,
pm.out = (u64 *)buf;
pm.end = (u64 *)(buf + count);
- if (!ptrace_may_attach(task)) {
- ret = -EIO;
- } else {
- unsigned long src = *ppos;
- unsigned long svpfn = src / PM_ENTRY_BYTES;
- unsigned long start_vaddr = svpfn << PAGE_SHIFT;
- unsigned long end_vaddr = TASK_SIZE_OF(task);
-
- /* watch out for wraparound */
- if (svpfn > TASK_SIZE_OF(task) >> PAGE_SHIFT)
- start_vaddr = end_vaddr;
-
- /*
- * The odds are that this will stop walking way
- * before end_vaddr, because the length of the
- * user buffer is tracked in "pm", and the walk
- * will stop when we hit the end of the buffer.
- */
- ret = walk_page_range(start_vaddr, end_vaddr,
- &pagemap_walk);
- if (ret == PM_END_OF_BUFFER)
- ret = 0;
- /* don't need mmap_sem for these, but this looks cleaner */
- *ppos += (char *)pm.out - buf;
- if (!ret)
- ret = (char *)pm.out - buf;
- }
+ pagemap_walk.pmd_entry = pagemap_pte_range;
+ pagemap_walk.pte_hole = pagemap_pte_hole;
+ pagemap_walk.mm = mm;
+ pagemap_walk.private = &pm;
+
+ src = *ppos;
+ svpfn = src / PM_ENTRY_BYTES;
+ start_vaddr = svpfn << PAGE_SHIFT;
+ end_vaddr = TASK_SIZE_OF(task);
+
+ /* watch out for wraparound */
+ if (svpfn > TASK_SIZE_OF(task) >> PAGE_SHIFT)
+ start_vaddr = end_vaddr;
+
+ /*
+ * The odds are that this will stop walking way
+ * before end_vaddr, because the length of the
+ * user buffer is tracked in "pm", and the walk
+ * will stop when we hit the end of the buffer.
+ */
+ ret = walk_page_range(start_vaddr, end_vaddr, &pagemap_walk);
+ if (ret == PM_END_OF_BUFFER)
+ ret = 0;
+ /* don't need mmap_sem for these, but this looks cleaner */
+ *ppos += (char *)pm.out - buf;
+ if (!ret)
+ ret = (char *)pm.out - buf;
out_pages:
for (; pagecount; pagecount--) {