diff options
Diffstat (limited to 'security')
| -rw-r--r-- | security/apparmor/lsm.c | 49 |
1 files changed, 48 insertions, 1 deletions
diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c index 49d664ddff44..87500bde5a92 100644 --- a/security/apparmor/lsm.c +++ b/security/apparmor/lsm.c @@ -1336,9 +1336,16 @@ module_param_named(path_max, aa_g_path_max, aauint, S_IRUSR); bool aa_g_paranoid_load = true; module_param_named(paranoid_load, aa_g_paranoid_load, aabool, S_IRUGO); +static int param_get_aaintbool(char *buffer, const struct kernel_param *kp); +static int param_set_aaintbool(const char *val, const struct kernel_param *kp); +#define param_check_aaintbool param_check_int +static const struct kernel_param_ops param_ops_aaintbool = { + .set = param_set_aaintbool, + .get = param_get_aaintbool +}; /* Boot time disable flag */ static int apparmor_enabled __lsm_ro_after_init = 1; -module_param_named(enabled, apparmor_enabled, int, 0444); +module_param_named(enabled, apparmor_enabled, aaintbool, 0444); static int __init apparmor_enabled_setup(char *str) { @@ -1413,6 +1420,46 @@ static int param_get_aauint(char *buffer, const struct kernel_param *kp) return param_get_uint(buffer, kp); } +/* Can only be set before AppArmor is initialized (i.e. on boot cmdline). */ +static int param_set_aaintbool(const char *val, const struct kernel_param *kp) +{ + struct kernel_param kp_local; + bool value; + int error; + + if (apparmor_initialized) + return -EPERM; + + /* Create local copy, with arg pointing to bool type. */ + value = !!*((int *)kp->arg); + memcpy(&kp_local, kp, sizeof(kp_local)); + kp_local.arg = &value; + + error = param_set_bool(val, &kp_local); + if (!error) + *((int *)kp->arg) = *((bool *)kp_local.arg); + return error; +} + +/* + * To avoid changing /sys/module/apparmor/parameters/enabled from Y/N to + * 1/0, this converts the "int that is actually bool" back to bool for + * display in the /sys filesystem, while keeping it "int" for the LSM + * infrastructure. + */ +static int param_get_aaintbool(char *buffer, const struct kernel_param *kp) +{ + struct kernel_param kp_local; + bool value; + + /* Create local copy, with arg pointing to bool type. */ + value = !!*((int *)kp->arg); + memcpy(&kp_local, kp, sizeof(kp_local)); + kp_local.arg = &value; + + return param_get_bool(buffer, &kp_local); +} + static int param_get_audit(char *buffer, const struct kernel_param *kp) { if (!apparmor_enabled) |