When reading /proc/pid/pagemap at an offset that
does not contain mapped pages, call pagemap_fill
to fill the buffer with -1 until either the end,
or a valid vma is encountered.
Signed-off-by: Dave Boutcher <[email protected]>
---
fs/proc/task_mmu.c | 10 ++++++----
1 files changed, 6 insertions(+), 4 deletions(-)
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 1f78cb4..3978f31 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -671,10 +671,12 @@ static ssize_t pagemap_read(struct file *file, char __user *buf,
ret = -EIO;
goto out_mm;
}
- vend = min(vma->vm_start - 1, end - 1) + 1;
- ret = pagemap_fill(&pm, vend);
- if (ret || !pm.count)
- break;
+ if (pm.next < vma->vm_start) {
+ vend = min(vma->vm_start - 1, end - 1) + 1;
+ pagemap_fill(&pm, vend);
+ continue;
+ }
+
vend = min(vma->vm_end - 1, end - 1) + 1;
ret = walk_page_range(mm, vma->vm_start, vend,
&pagemap_walk, &pm);
--
1.4.4.2
-
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