mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-31 00:17:44 +00:00
7228918b34
As documented, the setup_indirect structure is nested inside
the setup_data structures in the setup_data list. The code currently
accesses the fields inside the setup_indirect structure but only
the sizeof(struct setup_data) is being memremapped. No crash
occurred but this is just due to how the area is remapped under the
covers.
Properly memremap both the setup_data and setup_indirect structures
in these cases before accessing them.
Fixes: b3c72fc9a7
("x86/boot: Introduce setup_indirect")
Signed-off-by: Ross Philipson <ross.philipson@oracle.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/1645668456-22036-2-git-send-email-ross.philipson@oracle.com
401 lines
7.9 KiB
C
401 lines
7.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Architecture specific sysfs attributes in /sys/kernel
|
|
*
|
|
* Copyright (C) 2007, Intel Corp.
|
|
* Huang Ying <ying.huang@intel.com>
|
|
* Copyright (C) 2013, 2013 Red Hat, Inc.
|
|
* Dave Young <dyoung@redhat.com>
|
|
*/
|
|
|
|
#include <linux/kobject.h>
|
|
#include <linux/string.h>
|
|
#include <linux/sysfs.h>
|
|
#include <linux/init.h>
|
|
#include <linux/stat.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/io.h>
|
|
|
|
#include <asm/setup.h>
|
|
|
|
static ssize_t version_show(struct kobject *kobj,
|
|
struct kobj_attribute *attr, char *buf)
|
|
{
|
|
return sprintf(buf, "0x%04x\n", boot_params.hdr.version);
|
|
}
|
|
|
|
static struct kobj_attribute boot_params_version_attr = __ATTR_RO(version);
|
|
|
|
static ssize_t boot_params_data_read(struct file *fp, struct kobject *kobj,
|
|
struct bin_attribute *bin_attr,
|
|
char *buf, loff_t off, size_t count)
|
|
{
|
|
memcpy(buf, (void *)&boot_params + off, count);
|
|
return count;
|
|
}
|
|
|
|
static struct bin_attribute boot_params_data_attr = {
|
|
.attr = {
|
|
.name = "data",
|
|
.mode = S_IRUGO,
|
|
},
|
|
.read = boot_params_data_read,
|
|
.size = sizeof(boot_params),
|
|
};
|
|
|
|
static struct attribute *boot_params_version_attrs[] = {
|
|
&boot_params_version_attr.attr,
|
|
NULL,
|
|
};
|
|
|
|
static struct bin_attribute *boot_params_data_attrs[] = {
|
|
&boot_params_data_attr,
|
|
NULL,
|
|
};
|
|
|
|
static const struct attribute_group boot_params_attr_group = {
|
|
.attrs = boot_params_version_attrs,
|
|
.bin_attrs = boot_params_data_attrs,
|
|
};
|
|
|
|
static int kobj_to_setup_data_nr(struct kobject *kobj, int *nr)
|
|
{
|
|
const char *name;
|
|
|
|
name = kobject_name(kobj);
|
|
return kstrtoint(name, 10, nr);
|
|
}
|
|
|
|
static int get_setup_data_paddr(int nr, u64 *paddr)
|
|
{
|
|
int i = 0;
|
|
struct setup_data *data;
|
|
u64 pa_data = boot_params.hdr.setup_data;
|
|
|
|
while (pa_data) {
|
|
if (nr == i) {
|
|
*paddr = pa_data;
|
|
return 0;
|
|
}
|
|
data = memremap(pa_data, sizeof(*data), MEMREMAP_WB);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
|
|
pa_data = data->next;
|
|
memunmap(data);
|
|
i++;
|
|
}
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int __init get_setup_data_size(int nr, size_t *size)
|
|
{
|
|
u64 pa_data = boot_params.hdr.setup_data, pa_next;
|
|
struct setup_indirect *indirect;
|
|
struct setup_data *data;
|
|
int i = 0;
|
|
u32 len;
|
|
|
|
while (pa_data) {
|
|
data = memremap(pa_data, sizeof(*data), MEMREMAP_WB);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
pa_next = data->next;
|
|
|
|
if (nr == i) {
|
|
if (data->type == SETUP_INDIRECT) {
|
|
len = sizeof(*data) + data->len;
|
|
memunmap(data);
|
|
data = memremap(pa_data, len, MEMREMAP_WB);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
|
|
indirect = (struct setup_indirect *)data->data;
|
|
|
|
if (indirect->type != SETUP_INDIRECT)
|
|
*size = indirect->len;
|
|
else
|
|
*size = data->len;
|
|
} else {
|
|
*size = data->len;
|
|
}
|
|
|
|
memunmap(data);
|
|
return 0;
|
|
}
|
|
|
|
pa_data = pa_next;
|
|
memunmap(data);
|
|
i++;
|
|
}
|
|
return -EINVAL;
|
|
}
|
|
|
|
static ssize_t type_show(struct kobject *kobj,
|
|
struct kobj_attribute *attr, char *buf)
|
|
{
|
|
struct setup_indirect *indirect;
|
|
struct setup_data *data;
|
|
int nr, ret;
|
|
u64 paddr;
|
|
u32 len;
|
|
|
|
ret = kobj_to_setup_data_nr(kobj, &nr);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = get_setup_data_paddr(nr, &paddr);
|
|
if (ret)
|
|
return ret;
|
|
data = memremap(paddr, sizeof(*data), MEMREMAP_WB);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
|
|
if (data->type == SETUP_INDIRECT) {
|
|
len = sizeof(*data) + data->len;
|
|
memunmap(data);
|
|
data = memremap(paddr, len, MEMREMAP_WB);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
|
|
indirect = (struct setup_indirect *)data->data;
|
|
|
|
ret = sprintf(buf, "0x%x\n", indirect->type);
|
|
} else {
|
|
ret = sprintf(buf, "0x%x\n", data->type);
|
|
}
|
|
|
|
memunmap(data);
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t setup_data_data_read(struct file *fp,
|
|
struct kobject *kobj,
|
|
struct bin_attribute *bin_attr,
|
|
char *buf,
|
|
loff_t off, size_t count)
|
|
{
|
|
struct setup_indirect *indirect;
|
|
struct setup_data *data;
|
|
int nr, ret = 0;
|
|
u64 paddr, len;
|
|
void *p;
|
|
|
|
ret = kobj_to_setup_data_nr(kobj, &nr);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = get_setup_data_paddr(nr, &paddr);
|
|
if (ret)
|
|
return ret;
|
|
data = memremap(paddr, sizeof(*data), MEMREMAP_WB);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
|
|
if (data->type == SETUP_INDIRECT) {
|
|
len = sizeof(*data) + data->len;
|
|
memunmap(data);
|
|
data = memremap(paddr, len, MEMREMAP_WB);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
|
|
indirect = (struct setup_indirect *)data->data;
|
|
|
|
if (indirect->type != SETUP_INDIRECT) {
|
|
paddr = indirect->addr;
|
|
len = indirect->len;
|
|
} else {
|
|
/*
|
|
* Even though this is technically undefined, return
|
|
* the data as though it is a normal setup_data struct.
|
|
* This will at least allow it to be inspected.
|
|
*/
|
|
paddr += sizeof(*data);
|
|
len = data->len;
|
|
}
|
|
} else {
|
|
paddr += sizeof(*data);
|
|
len = data->len;
|
|
}
|
|
|
|
if (off > len) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
if (count > len - off)
|
|
count = len - off;
|
|
|
|
if (!count)
|
|
goto out;
|
|
|
|
ret = count;
|
|
p = memremap(paddr, len, MEMREMAP_WB);
|
|
if (!p) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
memcpy(buf, p + off, count);
|
|
memunmap(p);
|
|
out:
|
|
memunmap(data);
|
|
return ret;
|
|
}
|
|
|
|
static struct kobj_attribute type_attr = __ATTR_RO(type);
|
|
|
|
static struct bin_attribute data_attr __ro_after_init = {
|
|
.attr = {
|
|
.name = "data",
|
|
.mode = S_IRUGO,
|
|
},
|
|
.read = setup_data_data_read,
|
|
};
|
|
|
|
static struct attribute *setup_data_type_attrs[] = {
|
|
&type_attr.attr,
|
|
NULL,
|
|
};
|
|
|
|
static struct bin_attribute *setup_data_data_attrs[] = {
|
|
&data_attr,
|
|
NULL,
|
|
};
|
|
|
|
static const struct attribute_group setup_data_attr_group = {
|
|
.attrs = setup_data_type_attrs,
|
|
.bin_attrs = setup_data_data_attrs,
|
|
};
|
|
|
|
static int __init create_setup_data_node(struct kobject *parent,
|
|
struct kobject **kobjp, int nr)
|
|
{
|
|
int ret = 0;
|
|
size_t size;
|
|
struct kobject *kobj;
|
|
char name[16]; /* should be enough for setup_data nodes numbers */
|
|
snprintf(name, 16, "%d", nr);
|
|
|
|
kobj = kobject_create_and_add(name, parent);
|
|
if (!kobj)
|
|
return -ENOMEM;
|
|
|
|
ret = get_setup_data_size(nr, &size);
|
|
if (ret)
|
|
goto out_kobj;
|
|
|
|
data_attr.size = size;
|
|
ret = sysfs_create_group(kobj, &setup_data_attr_group);
|
|
if (ret)
|
|
goto out_kobj;
|
|
*kobjp = kobj;
|
|
|
|
return 0;
|
|
out_kobj:
|
|
kobject_put(kobj);
|
|
return ret;
|
|
}
|
|
|
|
static void __init cleanup_setup_data_node(struct kobject *kobj)
|
|
{
|
|
sysfs_remove_group(kobj, &setup_data_attr_group);
|
|
kobject_put(kobj);
|
|
}
|
|
|
|
static int __init get_setup_data_total_num(u64 pa_data, int *nr)
|
|
{
|
|
int ret = 0;
|
|
struct setup_data *data;
|
|
|
|
*nr = 0;
|
|
while (pa_data) {
|
|
*nr += 1;
|
|
data = memremap(pa_data, sizeof(*data), MEMREMAP_WB);
|
|
if (!data) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
pa_data = data->next;
|
|
memunmap(data);
|
|
}
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int __init create_setup_data_nodes(struct kobject *parent)
|
|
{
|
|
struct kobject *setup_data_kobj, **kobjp;
|
|
u64 pa_data;
|
|
int i, j, nr, ret = 0;
|
|
|
|
pa_data = boot_params.hdr.setup_data;
|
|
if (!pa_data)
|
|
return 0;
|
|
|
|
setup_data_kobj = kobject_create_and_add("setup_data", parent);
|
|
if (!setup_data_kobj) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
ret = get_setup_data_total_num(pa_data, &nr);
|
|
if (ret)
|
|
goto out_setup_data_kobj;
|
|
|
|
kobjp = kmalloc_array(nr, sizeof(*kobjp), GFP_KERNEL);
|
|
if (!kobjp) {
|
|
ret = -ENOMEM;
|
|
goto out_setup_data_kobj;
|
|
}
|
|
|
|
for (i = 0; i < nr; i++) {
|
|
ret = create_setup_data_node(setup_data_kobj, kobjp + i, i);
|
|
if (ret)
|
|
goto out_clean_nodes;
|
|
}
|
|
|
|
kfree(kobjp);
|
|
return 0;
|
|
|
|
out_clean_nodes:
|
|
for (j = i - 1; j >= 0; j--)
|
|
cleanup_setup_data_node(*(kobjp + j));
|
|
kfree(kobjp);
|
|
out_setup_data_kobj:
|
|
kobject_put(setup_data_kobj);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int __init boot_params_ksysfs_init(void)
|
|
{
|
|
int ret;
|
|
struct kobject *boot_params_kobj;
|
|
|
|
boot_params_kobj = kobject_create_and_add("boot_params",
|
|
kernel_kobj);
|
|
if (!boot_params_kobj) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
ret = sysfs_create_group(boot_params_kobj, &boot_params_attr_group);
|
|
if (ret)
|
|
goto out_boot_params_kobj;
|
|
|
|
ret = create_setup_data_nodes(boot_params_kobj);
|
|
if (ret)
|
|
goto out_create_group;
|
|
|
|
return 0;
|
|
out_create_group:
|
|
sysfs_remove_group(boot_params_kobj, &boot_params_attr_group);
|
|
out_boot_params_kobj:
|
|
kobject_put(boot_params_kobj);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
arch_initcall(boot_params_ksysfs_init);
|