Commit 1b6e75ee authored Feb 06, 2016 by Oleg Drokin Committed by Rafael J. Wysocki Mar 09, 2016

ACPI / EC: Deny write access unless requested by module param



In debugfs it's not enough to just set file mode to read-only to
deny write access to a file, instead just don't provide
the write method unless write access is really requested.

Signed-off-by: Oleg Drokin <green@linuxhacker.ru>
Acked-by: Thomas Renninger <trenn@suse.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

parent f6cede5b

drivers/acpi/ec_sys.c

+3 −0

Original line number	Original line	Diff line number	Diff line
	@@ -73,6 +73,9 @@ static ssize_t acpi_ec_write_io(struct file f, const char __user buf,
	loff_t init_off = *off;		loff_t init_off = *off;
	int err = 0;		int err = 0;

			if (!write_support)
			return -EINVAL;

	if (*off >= EC_SPACE_SIZE)		if (*off >= EC_SPACE_SIZE)
	return 0;		return 0;
	if (*off + count >= EC_SPACE_SIZE) {		if (*off + count >= EC_SPACE_SIZE) {