diff options
| author | Thomas Renninger <trenn@suse.de> | 2010-07-29 22:30:24 +0200 |
|---|---|---|
| committer | Matthew Garrett <mjg@redhat.com> | 2010-08-03 09:49:13 -0400 |
| commit | 500de3dd46ac9f9ae9d124634c68907b7d50d2cb (patch) | |
| tree | 4ba63c739c3363950a57d459e1fa5c3dcff4a9ab /drivers/acpi/ec_sys.c | |
| parent | de4f10466e9347a2f1bfe39e501539557bed2c4b (diff) | |
acpi ec_sys: Be more cautious about ec write access
- Set Kconfig option default n
- Only allow root to read/write io file (sever bug!)
- Introduce write support module param -> default off
- Properly clean up if any debugfs files cannot be created
Signed-off-by: Thomas Renninger <trenn@suse.de>
CC: mjg59@srcf.ucam.org
CC: platform-driver-x86@vger.kernel.org
CC: linux-acpi@vger.kernel.org
CC: astarikovskiy@suse.de
Signed-off-by: Matthew Garrett <mjg@redhat.com>
Diffstat (limited to 'drivers/acpi/ec_sys.c')
| -rw-r--r-- | drivers/acpi/ec_sys.c | 31 |
1 files changed, 24 insertions, 7 deletions
diff --git a/drivers/acpi/ec_sys.c b/drivers/acpi/ec_sys.c index 3ef978185c7..0e869b3f81c 100644 --- a/drivers/acpi/ec_sys.c +++ b/drivers/acpi/ec_sys.c @@ -17,6 +17,11 @@ MODULE_AUTHOR("Thomas Renninger <trenn@suse.de>"); MODULE_DESCRIPTION("ACPI EC sysfs access driver"); MODULE_LICENSE("GPL"); +static bool write_support; +module_param(write_support, bool, 0644); +MODULE_PARM_DESC(write_support, "Dangerous, reboot and removal of battery may " + "be needed."); + #define EC_SPACE_SIZE 256 struct sysdev_class acpi_ec_sysdev_class = { @@ -102,6 +107,8 @@ int acpi_ec_add_debugfs(struct acpi_ec *ec, unsigned int ec_device_count) { struct dentry *dev_dir; char name[64]; + mode_t mode = 0400; + if (ec_device_count == 0) { acpi_ec_debugfs_dir = debugfs_create_dir("ec", NULL); if (!acpi_ec_debugfs_dir) @@ -111,17 +118,27 @@ int acpi_ec_add_debugfs(struct acpi_ec *ec, unsigned int ec_device_count) sprintf(name, "ec%u", ec_device_count); dev_dir = debugfs_create_dir(name, acpi_ec_debugfs_dir); if (!dev_dir) { - if (ec_device_count == 0) - debugfs_remove_recursive(acpi_ec_debugfs_dir); - /* TBD: Proper cleanup for multiple ECs */ + if (ec_device_count != 0) + goto error; return -ENOMEM; } - debugfs_create_x32("gpe", 0444, dev_dir, (u32 *)&first_ec->gpe); - debugfs_create_bool("use_global_lock", 0444, dev_dir, - (u32 *)&first_ec->global_lock); - debugfs_create_file("io", 0666, dev_dir, ec, &acpi_ec_io_ops); + if (!debugfs_create_x32("gpe", 0444, dev_dir, (u32 *)&first_ec->gpe)) + goto error; + if (!debugfs_create_bool("use_global_lock", 0444, dev_dir, + (u32 *)&first_ec->global_lock)) + goto error; + + if (write_support) + mode = 0600; + if (!debugfs_create_file("io", mode, dev_dir, ec, &acpi_ec_io_ops)) + goto error; + return 0; + +error: + debugfs_remove_recursive(acpi_ec_debugfs_dir); + return -ENOMEM; } static int __init acpi_ec_sys_init(void) |