// SPDX-License-Identifier: GPL-2.0-only/* * System calls implementing the Linux Security Module API. * *  Copyright (C) 2022 Casey Schaufler <casey@schaufler-ca.com> *  Copyright (C) 2022 Intel Corporation */ #include <asm/current.h>#include <linux/compiler_types.h>#include <linux/err.h>#include <linux/errno.h>#include <linux/security.h>#include <linux/stddef.h>#include <linux/syscalls.h>#include <linux/types.h>#include <linux/lsm_hooks.h>#include <uapi/linux/lsm.h> #include "lsm.h" /** * lsm_name_to_attr - map an LSM attribute name to its ID * @name: name of the attribute * * Returns the LSM attribute value associated with @name, or 0 if * there is no mapping. */u64 lsm_name_to_attr(const char *name){	if (!strcmp(name, "current"))		return LSM_ATTR_CURRENT;	if (!strcmp(name, "exec"))		return LSM_ATTR_EXEC;	if (!strcmp(name, "fscreate"))		return LSM_ATTR_FSCREATE;	if (!strcmp(name, "keycreate"))		return LSM_ATTR_KEYCREATE;	if (!strcmp(name, "prev"))		return LSM_ATTR_PREV;	if (!strcmp(name, "sockcreate"))		return LSM_ATTR_SOCKCREATE;	return LSM_ATTR_UNDEF;} /** * sys_lsm_set_self_attr - Set current task's security module attribute * @attr: which attribute to set * @ctx: the LSM contexts * @size: size of @ctx * @flags: reserved for future use * * Sets the calling task's LSM context. On success this function * returns 0. If the attribute specified cannot be set a negative * value indicating the reason for the error is returned. */SYSCALL_DEFINE4(lsm_set_self_attr, unsigned int, attr, struct lsm_ctx __user *,		ctx, u32, size, u32, flags){	int rc; 	rc = mutex_lock_interruptible(&current->signal->cred_guard_mutex);	if (rc < 0)		return rc;	rc = security_setselfattr(attr, ctx, size, flags);	mutex_unlock(&current->signal->cred_guard_mutex);	return rc;} /** * sys_lsm_get_self_attr - Return current task's security module attributes * @attr: which attribute to return * @ctx: the user-space destination for the information, or NULL * @size: pointer to the size of space available to receive the data * @flags: special handling options. LSM_FLAG_SINGLE indicates that only * attributes associated with the LSM identified in the passed @ctx be * reported. * * Returns the calling task's LSM contexts. On success this * function returns the number of @ctx array elements. This value * may be zero if there are no LSM contexts assigned. If @size is * insufficient to contain the return data -E2BIG is returned and * @size is set to the minimum required size. In all other cases * a negative value indicating the error is returned. */SYSCALL_DEFINE4(lsm_get_self_attr, unsigned int, attr, struct lsm_ctx __user *,		ctx, u32 __user *, size, u32, flags){	return security_getselfattr(attr, ctx, size, flags);} /** * sys_lsm_list_modules - Return a list of the active security modules * @ids: the LSM module ids * @size: pointer to size of @ids, updated on return * @flags: reserved for future use, must be zero * * Returns a list of the active LSM ids. On success this function * returns the number of @ids array elements. This value may be zero * if there are no LSMs active. If @size is insufficient to contain * the return data -E2BIG is returned and @size is set to the minimum * required size. In all other cases a negative value indicating the * error is returned. */SYSCALL_DEFINE3(lsm_list_modules, u64 __user *, ids, u32 __user *, size,		u32, flags){	u32 total_size = lsm_active_cnt * sizeof(*ids);	u32 usize;	int i; 	if (flags)		return -EINVAL; 	if (get_user(usize, size))		return -EFAULT; 	if (put_user(total_size, size) != 0)		return -EFAULT; 	if (usize < total_size)		return -E2BIG; 	for (i = 0; i < lsm_active_cnt; i++)		if (put_user(lsm_idlist[i]->id, ids++))			return -EFAULT; 	return lsm_active_cnt;}