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Commit d6f64b89 authored by Al Viro's avatar Al Viro
Browse files

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: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent ec6fd8a4

fs/proc/base.c

+4 −6
Original line number Diff line number Diff line
@@ -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;