Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 782 insertions, 0 deletions

diff --git a/drivers/firmware/efi/test/efi_test.c b/drivers/firmware/efi/test/efi_test.c
new file mode 100644
index 000000000..47d67bb0a
--- /dev/null
+++ b/drivers/firmware/efi/test/efi_test.c
@@ -0,0 +1,782 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * EFI Test Driver for Runtime Services
+ *
+ * Copyright(C) 2012-2016 Canonical Ltd.
+ *
+ * This driver exports EFI runtime services interfaces into userspace, which
+ * allow to use and test UEFI runtime services provided by firmware.
+ *
+ */
+
+#include <linux/miscdevice.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/proc_fs.h>
+#include <linux/efi.h>
+#include <linux/security.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+
+#include "efi_test.h"
+
+MODULE_AUTHOR("Ivan Hu <ivan.hu@canonical.com>");
+MODULE_DESCRIPTION("EFI Test Driver");
+MODULE_LICENSE("GPL");
+
+/*
+ * Count the bytes in 'str', including the terminating NULL.
+ *
+ * Note this function returns the number of *bytes*, not the number of
+ * ucs2 characters.
+ */
+static inline size_t user_ucs2_strsize(efi_char16_t  __user *str)
+{
+	efi_char16_t *s = str, c;
+	size_t len;
+
+	if (!str)
+		return 0;
+
+	/* Include terminating NULL */
+	len = sizeof(efi_char16_t);
+
+	if (get_user(c, s++)) {
+		/* Can't read userspace memory for size */
+		return 0;
+	}
+
+	while (c != 0) {
+		if (get_user(c, s++)) {
+			/* Can't read userspace memory for size */
+			return 0;
+		}
+		len += sizeof(efi_char16_t);
+	}
+	return len;
+}
+
+/*
+ * Allocate a buffer and copy a ucs2 string from user space into it.
+ */
+static inline int
+copy_ucs2_from_user_len(efi_char16_t **dst, efi_char16_t __user *src,
+			size_t len)
+{
+	efi_char16_t *buf;
+
+	if (!src) {
+		*dst = NULL;
+		return 0;
+	}
+
+	buf = memdup_user(src, len);
+	if (IS_ERR(buf)) {
+		*dst = NULL;
+		return PTR_ERR(buf);
+	}
+	*dst = buf;
+
+	return 0;
+}
+
+/*
+ * Count the bytes in 'str', including the terminating NULL.
+ *
+ * Just a wrap for user_ucs2_strsize
+ */
+static inline int
+get_ucs2_strsize_from_user(efi_char16_t __user *src, size_t *len)
+{
+	*len = user_ucs2_strsize(src);
+	if (*len == 0)
+		return -EFAULT;
+
+	return 0;
+}
+
+/*
+ * Calculate the required buffer allocation size and copy a ucs2 string
+ * from user space into it.
+ *
+ * This function differs from copy_ucs2_from_user_len() because it
+ * calculates the size of the buffer to allocate by taking the length of
+ * the string 'src'.
+ *
+ * If a non-zero value is returned, the caller MUST NOT access 'dst'.
+ *
+ * It is the caller's responsibility to free 'dst'.
+ */
+static inline int
+copy_ucs2_from_user(efi_char16_t **dst, efi_char16_t __user *src)
+{
+	size_t len;
+
+	len = user_ucs2_strsize(src);
+	if (len == 0)
+		return -EFAULT;
+	return copy_ucs2_from_user_len(dst, src, len);
+}
+
+/*
+ * Copy a ucs2 string to a user buffer.
+ *
+ * This function is a simple wrapper around copy_to_user() that does
+ * nothing if 'src' is NULL, which is useful for reducing the amount of
+ * NULL checking the caller has to do.
+ *
+ * 'len' specifies the number of bytes to copy.
+ */
+static inline int
+copy_ucs2_to_user_len(efi_char16_t __user *dst, efi_char16_t *src, size_t len)
+{
+	if (!src)
+		return 0;
+
+	return copy_to_user(dst, src, len);
+}
+
+static long efi_runtime_get_variable(unsigned long arg)
+{
+	struct efi_getvariable __user *getvariable_user;
+	struct efi_getvariable getvariable;
+	unsigned long datasize = 0, prev_datasize, *dz;
+	efi_guid_t vendor_guid, *vd = NULL;
+	efi_status_t status;
+	efi_char16_t *name = NULL;
+	u32 attr, *at;
+	void *data = NULL;
+	int rv = 0;
+
+	getvariable_user = (struct efi_getvariable __user *)arg;
+
+	if (copy_from_user(&getvariable, getvariable_user,
+			   sizeof(getvariable)))
+		return -EFAULT;
+	if (getvariable.data_size &&
+	    get_user(datasize, getvariable.data_size))
+		return -EFAULT;
+	if (getvariable.vendor_guid) {
+		if (copy_from_user(&vendor_guid, getvariable.vendor_guid,
+					sizeof(vendor_guid)))
+			return -EFAULT;
+		vd = &vendor_guid;
+	}
+
+	if (getvariable.variable_name) {
+		rv = copy_ucs2_from_user(&name, getvariable.variable_name);
+		if (rv)
+			return rv;
+	}
+
+	at = getvariable.attributes ? &attr : NULL;
+	dz = getvariable.data_size ? &datasize : NULL;
+
+	if (getvariable.data_size && getvariable.data) {
+		data = kmalloc(datasize, GFP_KERNEL);
+		if (!data) {
+			kfree(name);
+			return -ENOMEM;
+		}
+	}
+
+	prev_datasize = datasize;
+	status = efi.get_variable(name, vd, at, dz, data);
+	kfree(name);
+
+	if (put_user(status, getvariable.status)) {
+		rv = -EFAULT;
+		goto out;
+	}
+
+	if (status != EFI_SUCCESS) {
+		if (status == EFI_BUFFER_TOO_SMALL) {
+			if (dz && put_user(datasize, getvariable.data_size)) {
+				rv = -EFAULT;
+				goto out;
+			}
+		}
+		rv = -EINVAL;
+		goto out;
+	}
+
+	if (prev_datasize < datasize) {
+		rv = -EINVAL;
+		goto out;
+	}
+
+	if (data) {
+		if (copy_to_user(getvariable.data, data, datasize)) {
+			rv = -EFAULT;
+			goto out;
+		}
+	}
+
+	if (at && put_user(attr, getvariable.attributes)) {
+		rv = -EFAULT;
+		goto out;
+	}
+
+	if (dz && put_user(datasize, getvariable.data_size))
+		rv = -EFAULT;
+
+out:
+	kfree(data);
+	return rv;
+
+}
+
+static long efi_runtime_set_variable(unsigned long arg)
+{
+	struct efi_setvariable __user *setvariable_user;
+	struct efi_setvariable setvariable;
+	efi_guid_t vendor_guid;
+	efi_status_t status;
+	efi_char16_t *name = NULL;
+	void *data;
+	int rv = 0;
+
+	setvariable_user = (struct efi_setvariable __user *)arg;
+
+	if (copy_from_user(&setvariable, setvariable_user, sizeof(setvariable)))
+		return -EFAULT;
+	if (copy_from_user(&vendor_guid, setvariable.vendor_guid,
+				sizeof(vendor_guid)))
+		return -EFAULT;
+
+	if (setvariable.variable_name) {
+		rv = copy_ucs2_from_user(&name, setvariable.variable_name);
+		if (rv)
+			return rv;
+	}
+
+	data = memdup_user(setvariable.data, setvariable.data_size);
+	if (IS_ERR(data)) {
+		kfree(name);
+		return PTR_ERR(data);
+	}
+
+	status = efi.set_variable(name, &vendor_guid,
+				setvariable.attributes,
+				setvariable.data_size, data);
+
+	if (put_user(status, setvariable.status)) {
+		rv = -EFAULT;
+		goto out;
+	}
+
+	rv = status == EFI_SUCCESS ? 0 : -EINVAL;
+
+out:
+	kfree(data);
+	kfree(name);
+
+	return rv;
+}
+
+static long efi_runtime_get_time(unsigned long arg)
+{
+	struct efi_gettime __user *gettime_user;
+	struct efi_gettime  gettime;
+	efi_status_t status;
+	efi_time_cap_t cap;
+	efi_time_t efi_time;
+
+	gettime_user = (struct efi_gettime __user *)arg;
+	if (copy_from_user(&gettime, gettime_user, sizeof(gettime)))
+		return -EFAULT;
+
+	status = efi.get_time(gettime.time ? &efi_time : NULL,
+			      gettime.capabilities ? &cap : NULL);
+
+	if (put_user(status, gettime.status))
+		return -EFAULT;
+
+	if (status != EFI_SUCCESS)
+		return -EINVAL;
+
+	if (gettime.capabilities) {
+		efi_time_cap_t __user *cap_local;
+
+		cap_local = (efi_time_cap_t *)gettime.capabilities;
+		if (put_user(cap.resolution, &(cap_local->resolution)) ||
+			put_user(cap.accuracy, &(cap_local->accuracy)) ||
+			put_user(cap.sets_to_zero, &(cap_local->sets_to_zero)))
+			return -EFAULT;
+	}
+	if (gettime.time) {
+		if (copy_to_user(gettime.time, &efi_time, sizeof(efi_time_t)))
+			return -EFAULT;
+	}
+
+	return 0;
+}
+
+static long efi_runtime_set_time(unsigned long arg)
+{
+	struct efi_settime __user *settime_user;
+	struct efi_settime settime;
+	efi_status_t status;
+	efi_time_t efi_time;
+
+	settime_user = (struct efi_settime __user *)arg;
+	if (copy_from_user(&settime, settime_user, sizeof(settime)))
+		return -EFAULT;
+	if (copy_from_user(&efi_time, settime.time,
+					sizeof(efi_time_t)))
+		return -EFAULT;
+	status = efi.set_time(&efi_time);
+
+	if (put_user(status, settime.status))
+		return -EFAULT;
+
+	return status == EFI_SUCCESS ? 0 : -EINVAL;
+}
+
+static long efi_runtime_get_waketime(unsigned long arg)
+{
+	struct efi_getwakeuptime __user *getwakeuptime_user;
+	struct efi_getwakeuptime getwakeuptime;
+	efi_bool_t enabled, pending;
+	efi_status_t status;
+	efi_time_t efi_time;
+
+	getwakeuptime_user = (struct efi_getwakeuptime __user *)arg;
+	if (copy_from_user(&getwakeuptime, getwakeuptime_user,
+				sizeof(getwakeuptime)))
+		return -EFAULT;
+
+	status = efi.get_wakeup_time(
+		getwakeuptime.enabled ? (efi_bool_t *)&enabled : NULL,
+		getwakeuptime.pending ? (efi_bool_t *)&pending : NULL,
+		getwakeuptime.time ? &efi_time : NULL);
+
+	if (put_user(status, getwakeuptime.status))
+		return -EFAULT;
+
+	if (status != EFI_SUCCESS)
+		return -EINVAL;
+
+	if (getwakeuptime.enabled && put_user(enabled,
+						getwakeuptime.enabled))
+		return -EFAULT;
+
+	if (getwakeuptime.time) {
+		if (copy_to_user(getwakeuptime.time, &efi_time,
+				sizeof(efi_time_t)))
+			return -EFAULT;
+	}
+
+	return 0;
+}
+
+static long efi_runtime_set_waketime(unsigned long arg)
+{
+	struct efi_setwakeuptime __user *setwakeuptime_user;
+	struct efi_setwakeuptime setwakeuptime;
+	efi_bool_t enabled;
+	efi_status_t status;
+	efi_time_t efi_time;
+
+	setwakeuptime_user = (struct efi_setwakeuptime __user *)arg;
+
+	if (copy_from_user(&setwakeuptime, setwakeuptime_user,
+				sizeof(setwakeuptime)))
+		return -EFAULT;
+
+	enabled = setwakeuptime.enabled;
+	if (setwakeuptime.time) {
+		if (copy_from_user(&efi_time, setwakeuptime.time,
+					sizeof(efi_time_t)))
+			return -EFAULT;
+
+		status = efi.set_wakeup_time(enabled, &efi_time);
+	} else
+		status = efi.set_wakeup_time(enabled, NULL);
+
+	if (put_user(status, setwakeuptime.status))
+		return -EFAULT;
+
+	return status == EFI_SUCCESS ? 0 : -EINVAL;
+}
+
+static long efi_runtime_get_nextvariablename(unsigned long arg)
+{
+	struct efi_getnextvariablename __user *getnextvariablename_user;
+	struct efi_getnextvariablename getnextvariablename;
+	unsigned long name_size, prev_name_size = 0, *ns = NULL;
+	efi_status_t status;
+	efi_guid_t *vd = NULL;
+	efi_guid_t vendor_guid;
+	efi_char16_t *name = NULL;
+	int rv = 0;
+
+	getnextvariablename_user = (struct efi_getnextvariablename __user *)arg;
+
+	if (copy_from_user(&getnextvariablename, getnextvariablename_user,
+			   sizeof(getnextvariablename)))
+		return -EFAULT;
+
+	if (getnextvariablename.variable_name_size) {
+		if (get_user(name_size, getnextvariablename.variable_name_size))
+			return -EFAULT;
+		ns = &name_size;
+		prev_name_size = name_size;
+	}
+
+	if (getnextvariablename.vendor_guid) {
+		if (copy_from_user(&vendor_guid,
+				getnextvariablename.vendor_guid,
+				sizeof(vendor_guid)))
+			return -EFAULT;
+		vd = &vendor_guid;
+	}
+
+	if (getnextvariablename.variable_name) {
+		size_t name_string_size = 0;
+
+		rv = get_ucs2_strsize_from_user(
+				getnextvariablename.variable_name,
+				&name_string_size);
+		if (rv)
+			return rv;
+		/*
+		 * The name_size may be smaller than the real buffer size where
+		 * variable name located in some use cases. The most typical
+		 * case is passing a 0 to get the required buffer size for the
+		 * 1st time call. So we need to copy the content from user
+		 * space for at least the string size of variable name, or else
+		 * the name passed to UEFI may not be terminated as we expected.
+		 */
+		rv = copy_ucs2_from_user_len(&name,
+				getnextvariablename.variable_name,
+				prev_name_size > name_string_size ?
+				prev_name_size : name_string_size);
+		if (rv)
+			return rv;
+	}
+
+	status = efi.get_next_variable(ns, name, vd);
+
+	if (put_user(status, getnextvariablename.status)) {
+		rv = -EFAULT;
+		goto out;
+	}
+
+	if (status != EFI_SUCCESS) {
+		if (status == EFI_BUFFER_TOO_SMALL) {
+			if (ns && put_user(*ns,
+				getnextvariablename.variable_name_size)) {
+				rv = -EFAULT;
+				goto out;
+			}
+		}
+		rv = -EINVAL;
+		goto out;
+	}
+
+	if (name) {
+		if (copy_ucs2_to_user_len(getnextvariablename.variable_name,
+						name, prev_name_size)) {
+			rv = -EFAULT;
+			goto out;
+		}
+	}
+
+	if (ns) {
+		if (put_user(*ns, getnextvariablename.variable_name_size)) {
+			rv = -EFAULT;
+			goto out;
+		}
+	}
+
+	if (vd) {
+		if (copy_to_user(getnextvariablename.vendor_guid, vd,
+							sizeof(efi_guid_t)))
+			rv = -EFAULT;
+	}
+
+out:
+	kfree(name);
+	return rv;
+}
+
+static long efi_runtime_get_nexthighmonocount(unsigned long arg)
+{
+	struct efi_getnexthighmonotoniccount __user *getnexthighmonocount_user;
+	struct efi_getnexthighmonotoniccount getnexthighmonocount;
+	efi_status_t status;
+	u32 count;
+
+	getnexthighmonocount_user = (struct
+			efi_getnexthighmonotoniccount __user *)arg;
+
+	if (copy_from_user(&getnexthighmonocount,
+			   getnexthighmonocount_user,
+			   sizeof(getnexthighmonocount)))
+		return -EFAULT;
+
+	status = efi.get_next_high_mono_count(
+		getnexthighmonocount.high_count ? &count : NULL);
+
+	if (put_user(status, getnexthighmonocount.status))
+		return -EFAULT;
+
+	if (status != EFI_SUCCESS)
+		return -EINVAL;
+
+	if (getnexthighmonocount.high_count &&
+	    put_user(count, getnexthighmonocount.high_count))
+		return -EFAULT;
+
+	return 0;
+}
+
+static long efi_runtime_reset_system(unsigned long arg)
+{
+	struct efi_resetsystem __user *resetsystem_user;
+	struct efi_resetsystem resetsystem;
+	void *data = NULL;
+
+	resetsystem_user = (struct efi_resetsystem __user *)arg;
+	if (copy_from_user(&resetsystem, resetsystem_user,
+						sizeof(resetsystem)))
+		return -EFAULT;
+	if (resetsystem.data_size != 0) {
+		data = memdup_user((void *)resetsystem.data,
+						resetsystem.data_size);
+		if (IS_ERR(data))
+			return PTR_ERR(data);
+	}
+
+	efi.reset_system(resetsystem.reset_type, resetsystem.status,
+				resetsystem.data_size, (efi_char16_t *)data);
+
+	kfree(data);
+	return 0;
+}
+
+static long efi_runtime_query_variableinfo(unsigned long arg)
+{
+	struct efi_queryvariableinfo __user *queryvariableinfo_user;
+	struct efi_queryvariableinfo queryvariableinfo;
+	efi_status_t status;
+	u64 max_storage, remaining, max_size;
+
+	queryvariableinfo_user = (struct efi_queryvariableinfo __user *)arg;
+
+	if (copy_from_user(&queryvariableinfo, queryvariableinfo_user,
+			   sizeof(queryvariableinfo)))
+		return -EFAULT;
+
+	status = efi.query_variable_info(queryvariableinfo.attributes,
+					 &max_storage, &remaining, &max_size);
+
+	if (put_user(status, queryvariableinfo.status))
+		return -EFAULT;
+
+	if (status != EFI_SUCCESS)
+		return -EINVAL;
+
+	if (put_user(max_storage,
+		     queryvariableinfo.maximum_variable_storage_size))
+		return -EFAULT;
+
+	if (put_user(remaining,
+		     queryvariableinfo.remaining_variable_storage_size))
+		return -EFAULT;
+
+	if (put_user(max_size, queryvariableinfo.maximum_variable_size))
+		return -EFAULT;
+
+	return 0;
+}
+
+static long efi_runtime_query_capsulecaps(unsigned long arg)
+{
+	struct efi_querycapsulecapabilities __user *qcaps_user;
+	struct efi_querycapsulecapabilities qcaps;
+	efi_capsule_header_t *capsules;
+	efi_status_t status;
+	u64 max_size;
+	int i, reset_type;
+	int rv = 0;
+
+	qcaps_user = (struct efi_querycapsulecapabilities __user *)arg;
+
+	if (copy_from_user(&qcaps, qcaps_user, sizeof(qcaps)))
+		return -EFAULT;
+
+	if (qcaps.capsule_count == ULONG_MAX)
+		return -EINVAL;
+
+	capsules = kcalloc(qcaps.capsule_count + 1,
+			   sizeof(efi_capsule_header_t), GFP_KERNEL);
+	if (!capsules)
+		return -ENOMEM;
+
+	for (i = 0; i < qcaps.capsule_count; i++) {
+		efi_capsule_header_t *c;
+		/*
+		 * We cannot dereference qcaps.capsule_header_array directly to
+		 * obtain the address of the capsule as it resides in the
+		 * user space
+		 */
+		if (get_user(c, qcaps.capsule_header_array + i)) {
+			rv = -EFAULT;
+			goto out;
+		}
+		if (copy_from_user(&capsules[i], c,
+				sizeof(efi_capsule_header_t))) {
+			rv = -EFAULT;
+			goto out;
+		}
+	}
+
+	qcaps.capsule_header_array = &capsules;
+
+	status = efi.query_capsule_caps((efi_capsule_header_t **)
+					qcaps.capsule_header_array,
+					qcaps.capsule_count,
+					&max_size, &reset_type);
+
+	if (put_user(status, qcaps.status)) {
+		rv = -EFAULT;
+		goto out;
+	}
+
+	if (status != EFI_SUCCESS) {
+		rv = -EINVAL;
+		goto out;
+	}
+
+	if (put_user(max_size, qcaps.maximum_capsule_size)) {
+		rv = -EFAULT;
+		goto out;
+	}
+
+	if (put_user(reset_type, qcaps.reset_type))
+		rv = -EFAULT;
+
+out:
+	kfree(capsules);
+	return rv;
+}
+
+static long efi_runtime_get_supported_mask(unsigned long arg)
+{
+	unsigned int __user *supported_mask;
+	int rv = 0;
+
+	supported_mask = (unsigned int *)arg;
+
+	if (put_user(efi.runtime_supported_mask, supported_mask))
+		rv = -EFAULT;
+
+	return rv;
+}
+
+static long efi_test_ioctl(struct file *file, unsigned int cmd,
+							unsigned long arg)
+{
+	switch (cmd) {
+	case EFI_RUNTIME_GET_VARIABLE:
+		return efi_runtime_get_variable(arg);
+
+	case EFI_RUNTIME_SET_VARIABLE:
+		return efi_runtime_set_variable(arg);
+
+	case EFI_RUNTIME_GET_TIME:
+		return efi_runtime_get_time(arg);
+
+	case EFI_RUNTIME_SET_TIME:
+		return efi_runtime_set_time(arg);
+
+	case EFI_RUNTIME_GET_WAKETIME:
+		return efi_runtime_get_waketime(arg);
+
+	case EFI_RUNTIME_SET_WAKETIME:
+		return efi_runtime_set_waketime(arg);
+
+	case EFI_RUNTIME_GET_NEXTVARIABLENAME:
+		return efi_runtime_get_nextvariablename(arg);
+
+	case EFI_RUNTIME_GET_NEXTHIGHMONOTONICCOUNT:
+		return efi_runtime_get_nexthighmonocount(arg);
+
+	case EFI_RUNTIME_QUERY_VARIABLEINFO:
+		return efi_runtime_query_variableinfo(arg);
+
+	case EFI_RUNTIME_QUERY_CAPSULECAPABILITIES:
+		return efi_runtime_query_capsulecaps(arg);
+
+	case EFI_RUNTIME_RESET_SYSTEM:
+		return efi_runtime_reset_system(arg);
+
+	case EFI_RUNTIME_GET_SUPPORTED_MASK:
+		return efi_runtime_get_supported_mask(arg);
+	}
+
+	return -ENOTTY;
+}
+
+static int efi_test_open(struct inode *inode, struct file *file)
+{
+	int ret = security_locked_down(LOCKDOWN_EFI_TEST);
+
+	if (ret)
+		return ret;
+
+	if (!capable(CAP_SYS_ADMIN))
+		return -EACCES;
+	/*
+	 * nothing special to do here
+	 * We do accept multiple open files at the same time as we
+	 * synchronize on the per call operation.
+	 */
+	return 0;
+}
+
+static int efi_test_close(struct inode *inode, struct file *file)
+{
+	return 0;
+}
+
+/*
+ *	The various file operations we support.
+ */
+static const struct file_operations efi_test_fops = {
+	.owner		= THIS_MODULE,
+	.unlocked_ioctl	= efi_test_ioctl,
+	.open		= efi_test_open,
+	.release	= efi_test_close,
+	.llseek		= no_llseek,
+};
+
+static struct miscdevice efi_test_dev = {
+	MISC_DYNAMIC_MINOR,
+	"efi_test",
+	&efi_test_fops
+};
+
+static int __init efi_test_init(void)
+{
+	int ret;
+
+	ret = misc_register(&efi_test_dev);
+	if (ret) {
+		pr_err("efi_test: can't misc_register on minor=%d\n",
+			MISC_DYNAMIC_MINOR);
+		return ret;
+	}
+
+	return 0;
+}
+
+static void __exit efi_test_exit(void)
+{
+	misc_deregister(&efi_test_dev);
+}
+
+module_init(efi_test_init);
+module_exit(efi_test_exit);