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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>
hifive-unleashed-5.1
Al Viro 2011-02-15 22:26:01 -05:00
parent ec6fd8a435
commit d6f64b89d7
1 changed files with 4 additions and 6 deletions
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10
fs/proc/base.c
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@ -919,20 +919,18 @@ static ssize_t environ_read(struct file *file, char __user *buf,
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;