close race in /proc/*/environ
Switch to mm_for_maps(). Maybe we ought to make it r--r--r--,
since we do checks on IO anyway...
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/proc/base.c b/fs/proc/base.c
index c282811..fc471b8 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -919,20 +919,18 @@
if (!task)
goto out_no_task;
- if (!ptrace_may_access(task, PTRACE_MODE_READ))
- goto out;
-
ret = -ENOMEM;
page = (char *)__get_free_page(GFP_TEMPORARY);
if (!page)
goto out;
- ret = 0;
- mm = get_task_mm(task);
- if (!mm)
+ mm = mm_for_maps(task);
+ ret = PTR_ERR(mm);
+ if (!mm || IS_ERR(mm))
goto out_free;
+ ret = 0;
while (count > 0) {
int this_len, retval, max_len;