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linux/drivers/acpi/acpica/nsaccess.c
Bob Moore 927a6abf02 ACPICA: iASL: Enhance error detection 
Enhance error detection by validating that all name_seg elements
within a name_path actually exist. The previous behavior was spotty
at best, and such errors could be improperly ignored at compile
time (never at runtime, however). There are two new error messages.

Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Erik Schmauss <erik.schmauss@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2018-11-08 18:41:47 +01:00

715 lines
19 KiB
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// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/*******************************************************************************
*
* Module Name: nsaccess - Top-level functions for accessing ACPI namespace
*
******************************************************************************/
#include <acpi/acpi.h>
#include "accommon.h"
#include "amlcode.h"
#include "acnamesp.h"
#include "acdispat.h"
#ifdef ACPI_ASL_COMPILER
#include "acdisasm.h"
#endif
#define _COMPONENT ACPI_NAMESPACE
ACPI_MODULE_NAME("nsaccess")
/*******************************************************************************
*
* FUNCTION: acpi_ns_root_initialize
*
* PARAMETERS: None
*
* RETURN: Status
*
* DESCRIPTION: Allocate and initialize the default root named objects
*
* MUTEX: Locks namespace for entire execution
*
******************************************************************************/
acpi_status acpi_ns_root_initialize(void)
{
acpi_status status;
const struct acpi_predefined_names *init_val = NULL;
struct acpi_namespace_node *new_node;
union acpi_operand_object *obj_desc;
acpi_string val = NULL;
ACPI_FUNCTION_TRACE(ns_root_initialize);
status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/*
* The global root ptr is initially NULL, so a non-NULL value indicates
* that acpi_ns_root_initialize() has already been called; just return.
*/
if (acpi_gbl_root_node) {
status = AE_OK;
goto unlock_and_exit;
}
/*
* Tell the rest of the subsystem that the root is initialized
* (This is OK because the namespace is locked)
*/
acpi_gbl_root_node = &acpi_gbl_root_node_struct;
/* Enter the pre-defined names in the name table */
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Entering predefined entries into namespace\n"));
for (init_val = acpi_gbl_pre_defined_names; init_val->name; init_val++) {
/* _OSI is optional for now, will be permanent later */
if (!strcmp(init_val->name, "_OSI")
&& !acpi_gbl_create_osi_method) {
continue;
}
status =
acpi_ns_lookup(NULL, ACPI_CAST_PTR(char, init_val->name),
init_val->type, ACPI_IMODE_LOAD_PASS2,
ACPI_NS_NO_UPSEARCH, NULL, &new_node);
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status,
"Could not create predefined name %s",
init_val->name));
continue;
}
/*
* Name entered successfully. If entry in pre_defined_names[] specifies
* an initial value, create the initial value.
*/
if (init_val->val) {
status = acpi_os_predefined_override(init_val, &val);
if (ACPI_FAILURE(status)) {
ACPI_ERROR((AE_INFO,
"Could not override predefined %s",
init_val->name));
}
if (!val) {
val = init_val->val;
}
/*
* Entry requests an initial value, allocate a
* descriptor for it.
*/
obj_desc =
acpi_ut_create_internal_object(init_val->type);
if (!obj_desc) {
status = AE_NO_MEMORY;
goto unlock_and_exit;
}
/*
* Convert value string from table entry to
* internal representation. Only types actually
* used for initial values are implemented here.
*/
switch (init_val->type) {
case ACPI_TYPE_METHOD:
obj_desc->method.param_count =
(u8) ACPI_TO_INTEGER(val);
obj_desc->common.flags |= AOPOBJ_DATA_VALID;
#if defined (ACPI_ASL_COMPILER)
/* Save the parameter count for the iASL compiler */
new_node->value = obj_desc->method.param_count;
#else
/* Mark this as a very SPECIAL method */
obj_desc->method.info_flags =
ACPI_METHOD_INTERNAL_ONLY;
obj_desc->method.dispatch.implementation =
acpi_ut_osi_implementation;
#endif
break;
case ACPI_TYPE_INTEGER:
obj_desc->integer.value = ACPI_TO_INTEGER(val);
break;
case ACPI_TYPE_STRING:
/* Build an object around the static string */
obj_desc->string.length = (u32)strlen(val);
obj_desc->string.pointer = val;
obj_desc->common.flags |= AOPOBJ_STATIC_POINTER;
break;
case ACPI_TYPE_MUTEX:
obj_desc->mutex.node = new_node;
obj_desc->mutex.sync_level =
(u8) (ACPI_TO_INTEGER(val) - 1);
/* Create a mutex */
status =
acpi_os_create_mutex(&obj_desc->mutex.
os_mutex);
if (ACPI_FAILURE(status)) {
acpi_ut_remove_reference(obj_desc);
goto unlock_and_exit;
}
/* Special case for ACPI Global Lock */
if (strcmp(init_val->name, "_GL_") == 0) {
acpi_gbl_global_lock_mutex = obj_desc;
/* Create additional counting semaphore for global lock */
status =
acpi_os_create_semaphore(1, 0,
&acpi_gbl_global_lock_semaphore);
if (ACPI_FAILURE(status)) {
acpi_ut_remove_reference
(obj_desc);
goto unlock_and_exit;
}
}
break;
default:
ACPI_ERROR((AE_INFO,
"Unsupported initial type value 0x%X",
init_val->type));
acpi_ut_remove_reference(obj_desc);
obj_desc = NULL;
continue;
}
/* Store pointer to value descriptor in the Node */
status = acpi_ns_attach_object(new_node, obj_desc,
obj_desc->common.type);
/* Remove local reference to the object */
acpi_ut_remove_reference(obj_desc);
}
}
unlock_and_exit:
(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
/* Save a handle to "_GPE", it is always present */
if (ACPI_SUCCESS(status)) {
status = acpi_ns_get_node(NULL, "\\_GPE", ACPI_NS_NO_UPSEARCH,
&acpi_gbl_fadt_gpe_device);
}
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_lookup
*
* PARAMETERS: scope_info - Current scope info block
* pathname - Search pathname, in internal format
* (as represented in the AML stream)
* type - Type associated with name
* interpreter_mode - IMODE_LOAD_PASS2 => add name if not found
* flags - Flags describing the search restrictions
* walk_state - Current state of the walk
* return_node - Where the Node is placed (if found
* or created successfully)
*
* RETURN: Status
*
* DESCRIPTION: Find or enter the passed name in the name space.
* Log an error if name not found in Exec mode.
*
* MUTEX: Assumes namespace is locked.
*
******************************************************************************/
acpi_status
acpi_ns_lookup(union acpi_generic_state *scope_info,
char *pathname,
acpi_object_type type,
acpi_interpreter_mode interpreter_mode,
u32 flags,
struct acpi_walk_state *walk_state,
struct acpi_namespace_node **return_node)
{
acpi_status status;
char *path = pathname;
char *external_path;
struct acpi_namespace_node *prefix_node;
struct acpi_namespace_node *current_node = NULL;
struct acpi_namespace_node *this_node = NULL;
u32 num_segments;
u32 num_carats;
acpi_name simple_name;
acpi_object_type type_to_check_for;
acpi_object_type this_search_type;
u32 search_parent_flag = ACPI_NS_SEARCH_PARENT;
u32 local_flags;
acpi_interpreter_mode local_interpreter_mode;
ACPI_FUNCTION_TRACE(ns_lookup);
if (!return_node) {
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
local_flags = flags &
~(ACPI_NS_ERROR_IF_FOUND | ACPI_NS_OVERRIDE_IF_FOUND |
ACPI_NS_SEARCH_PARENT);
*return_node = ACPI_ENTRY_NOT_FOUND;
acpi_gbl_ns_lookup_count++;
if (!acpi_gbl_root_node) {
return_ACPI_STATUS(AE_NO_NAMESPACE);
}
/* Get the prefix scope. A null scope means use the root scope */
if ((!scope_info) || (!scope_info->scope.node)) {
ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
"Null scope prefix, using root node (%p)\n",
acpi_gbl_root_node));
prefix_node = acpi_gbl_root_node;
} else {
prefix_node = scope_info->scope.node;
if (ACPI_GET_DESCRIPTOR_TYPE(prefix_node) !=
ACPI_DESC_TYPE_NAMED) {
ACPI_ERROR((AE_INFO, "%p is not a namespace node [%s]",
prefix_node,
acpi_ut_get_descriptor_name(prefix_node)));
return_ACPI_STATUS(AE_AML_INTERNAL);
}
if (!(flags & ACPI_NS_PREFIX_IS_SCOPE)) {
/*
* This node might not be a actual "scope" node (such as a
* Device/Method, etc.) It could be a Package or other object
* node. Backup up the tree to find the containing scope node.
*/
while (!acpi_ns_opens_scope(prefix_node->type) &&
prefix_node->type != ACPI_TYPE_ANY) {
prefix_node = prefix_node->parent;
}
}
}
/* Save type. TBD: may be no longer necessary */
type_to_check_for = type;
/*
* Begin examination of the actual pathname
*/
if (!pathname) {
/* A Null name_path is allowed and refers to the root */
num_segments = 0;
this_node = acpi_gbl_root_node;
path = "";
ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
"Null Pathname (Zero segments), Flags=%X\n",
flags));
} else {
/*
* Name pointer is valid (and must be in internal name format)
*
* Check for scope prefixes:
*
* As represented in the AML stream, a namepath consists of an
* optional scope prefix followed by a name segment part.
*
* If present, the scope prefix is either a Root Prefix (in
* which case the name is fully qualified), or one or more
* Parent Prefixes (in which case the name's scope is relative
* to the current scope).
*/
if (*path == (u8) AML_ROOT_PREFIX) {
/* Pathname is fully qualified, start from the root */
this_node = acpi_gbl_root_node;
search_parent_flag = ACPI_NS_NO_UPSEARCH;
/* Point to name segment part */
path++;
ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
"Path is absolute from root [%p]\n",
this_node));
} else {
/* Pathname is relative to current scope, start there */
ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
"Searching relative to prefix scope [%4.4s] (%p)\n",
acpi_ut_get_node_name(prefix_node),
prefix_node));
/*
* Handle multiple Parent Prefixes (carat) by just getting
* the parent node for each prefix instance.
*/
this_node = prefix_node;
num_carats = 0;
while (*path == (u8) AML_PARENT_PREFIX) {
/* Name is fully qualified, no search rules apply */
search_parent_flag = ACPI_NS_NO_UPSEARCH;
/*
* Point past this prefix to the name segment
* part or the next Parent Prefix
*/
path++;
/* Backup to the parent node */
num_carats++;
this_node = this_node->parent;
if (!this_node) {
/*
* Current scope has no parent scope. Externalize
* the internal path for error message.
*/
status =
acpi_ns_externalize_name
(ACPI_UINT32_MAX, pathname, NULL,
&external_path);
if (ACPI_SUCCESS(status)) {
ACPI_ERROR((AE_INFO,
"%s: Path has too many parent prefixes (^)",
external_path));
ACPI_FREE(external_path);
}
return_ACPI_STATUS(AE_NOT_FOUND);
}
}
if (search_parent_flag == ACPI_NS_NO_UPSEARCH) {
ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
"Search scope is [%4.4s], path has %u carat(s)\n",
acpi_ut_get_node_name
(this_node), num_carats));
}
}
/*
* Determine the number of ACPI name segments in this pathname.
*
* The segment part consists of either:
* - A Null name segment (0)
* - A dual_name_prefix followed by two 4-byte name segments
* - A multi_name_prefix followed by a byte indicating the
* number of segments and the segments themselves.
* - A single 4-byte name segment
*
* Examine the name prefix opcode, if any, to determine the number of
* segments.
*/
switch (*path) {
case 0:
/*
* Null name after a root or parent prefixes. We already
* have the correct target node and there are no name segments.
*/
num_segments = 0;
type = this_node->type;
ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
"Prefix-only Pathname (Zero name segments), Flags=%X\n",
flags));
break;
case AML_DUAL_NAME_PREFIX:
/* More than one name_seg, search rules do not apply */
search_parent_flag = ACPI_NS_NO_UPSEARCH;
/* Two segments, point to first name segment */
num_segments = 2;
path++;
ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
"Dual Pathname (2 segments, Flags=%X)\n",
flags));
break;
case AML_MULTI_NAME_PREFIX:
/* More than one name_seg, search rules do not apply */
search_parent_flag = ACPI_NS_NO_UPSEARCH;
/* Extract segment count, point to first name segment */
path++;
num_segments = (u32) (u8) * path;
path++;
ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
"Multi Pathname (%u Segments, Flags=%X)\n",
num_segments, flags));
break;
default:
/*
* Not a Null name, no Dual or Multi prefix, hence there is
* only one name segment and Pathname is already pointing to it.
*/
num_segments = 1;
ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
"Simple Pathname (1 segment, Flags=%X)\n",
flags));
break;
}
ACPI_DEBUG_EXEC(acpi_ns_print_pathname(num_segments, path));
}
/*
* Search namespace for each segment of the name. Loop through and
* verify (or add to the namespace) each name segment.
*
* The object type is significant only at the last name
* segment. (We don't care about the types along the path, only
* the type of the final target object.)
*/
this_search_type = ACPI_TYPE_ANY;
current_node = this_node;
while (num_segments && current_node) {
num_segments--;
if (!num_segments) {
/* This is the last segment, enable typechecking */
this_search_type = type;
/*
* Only allow automatic parent search (search rules) if the caller
* requested it AND we have a single, non-fully-qualified name_seg
*/
if ((search_parent_flag != ACPI_NS_NO_UPSEARCH) &&
(flags & ACPI_NS_SEARCH_PARENT)) {
local_flags |= ACPI_NS_SEARCH_PARENT;
}
/* Set error flag according to caller */
if (flags & ACPI_NS_ERROR_IF_FOUND) {
local_flags |= ACPI_NS_ERROR_IF_FOUND;
}
/* Set override flag according to caller */
if (flags & ACPI_NS_OVERRIDE_IF_FOUND) {
local_flags |= ACPI_NS_OVERRIDE_IF_FOUND;
}
}
/* Handle opcodes that create a new name_seg via a full name_path */
local_interpreter_mode = interpreter_mode;
if ((flags & ACPI_NS_PREFIX_MUST_EXIST) && (num_segments > 0)) {
/* Every element of the path must exist (except for the final name_seg) */
local_interpreter_mode = ACPI_IMODE_EXECUTE;
}
/* Extract one ACPI name from the front of the pathname */
ACPI_MOVE_32_TO_32(&simple_name, path);
/* Try to find the single (4 character) ACPI name */
status =
acpi_ns_search_and_enter(simple_name, walk_state,
current_node,
local_interpreter_mode,
this_search_type, local_flags,
&this_node);
if (ACPI_FAILURE(status)) {
if (status == AE_NOT_FOUND) {
#if !defined ACPI_ASL_COMPILER /* Note: iASL reports this error by itself, not needed here */
if (flags & ACPI_NS_PREFIX_MUST_EXIST) {
acpi_os_printf(ACPI_MSG_BIOS_ERROR
"Object does not exist: %4.4s\n",
&simple_name);
}
#endif
/* Name not found in ACPI namespace */
ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
"Name [%4.4s] not found in scope [%4.4s] %p\n",
(char *)&simple_name,
(char *)&current_node->name,
current_node));
}
#ifdef ACPI_EXEC_APP
if ((status == AE_ALREADY_EXISTS) &&
(this_node->flags & ANOBJ_NODE_EARLY_INIT)) {
this_node->flags &= ~ANOBJ_NODE_EARLY_INIT;
status = AE_OK;
}
#endif
#ifdef ACPI_ASL_COMPILER
/*
* If this ACPI name already exists within the namespace as an
* external declaration, then mark the external as a conflicting
* declaration and proceed to process the current node as if it did
* not exist in the namespace. If this node is not processed as
* normal, then it could cause improper namespace resolution
* by failing to open a new scope.
*/
if (acpi_gbl_disasm_flag &&
(status == AE_ALREADY_EXISTS) &&
((this_node->flags & ANOBJ_IS_EXTERNAL) ||
(walk_state
&& walk_state->opcode == AML_EXTERNAL_OP))) {
this_node->flags &= ~ANOBJ_IS_EXTERNAL;
this_node->type = (u8)this_search_type;
if (walk_state->opcode != AML_EXTERNAL_OP) {
acpi_dm_mark_external_conflict
(this_node);
}
break;
}
#endif
*return_node = this_node;
return_ACPI_STATUS(status);
}
/* More segments to follow? */
if (num_segments > 0) {
/*
* If we have an alias to an object that opens a scope (such as a
* device or processor), we need to dereference the alias here so
* that we can access any children of the original node (via the
* remaining segments).
*/
if (this_node->type == ACPI_TYPE_LOCAL_ALIAS) {
if (!this_node->object) {
return_ACPI_STATUS(AE_NOT_EXIST);
}
if (acpi_ns_opens_scope
(((struct acpi_namespace_node *)
this_node->object)->type)) {
this_node =
(struct acpi_namespace_node *)
this_node->object;
}
}
}
/* Special handling for the last segment (num_segments == 0) */
else {
/*
* Sanity typecheck of the target object:
*
* If 1) This is the last segment (num_segments == 0)
* 2) And we are looking for a specific type
* (Not checking for TYPE_ANY)
* 3) Which is not an alias
* 4) Which is not a local type (TYPE_SCOPE)
* 5) And the type of target object is known (not TYPE_ANY)
* 6) And target object does not match what we are looking for
*
* Then we have a type mismatch. Just warn and ignore it.
*/
if ((type_to_check_for != ACPI_TYPE_ANY) &&
(type_to_check_for != ACPI_TYPE_LOCAL_ALIAS) &&
(type_to_check_for != ACPI_TYPE_LOCAL_METHOD_ALIAS)
&& (type_to_check_for != ACPI_TYPE_LOCAL_SCOPE)
&& (this_node->type != ACPI_TYPE_ANY)
&& (this_node->type != type_to_check_for)) {
/* Complain about a type mismatch */
ACPI_WARNING((AE_INFO,
"NsLookup: Type mismatch on %4.4s (%s), searching for (%s)",
ACPI_CAST_PTR(char, &simple_name),
acpi_ut_get_type_name(this_node->
type),
acpi_ut_get_type_name
(type_to_check_for)));
}
/*
* If this is the last name segment and we are not looking for a
* specific type, but the type of found object is known, use that
* type to (later) see if it opens a scope.
*/
if (type == ACPI_TYPE_ANY) {
type = this_node->type;
}
}
/* Point to next name segment and make this node current */
path += ACPI_NAME_SIZE;
current_node = this_node;
}
/* Always check if we need to open a new scope */
if (!(flags & ACPI_NS_DONT_OPEN_SCOPE) && (walk_state)) {
/*
* If entry is a type which opens a scope, push the new scope on the
* scope stack.
*/
if (acpi_ns_opens_scope(type)) {
status =
acpi_ds_scope_stack_push(this_node, type,
walk_state);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
}
}
#ifdef ACPI_EXEC_APP
if (flags & ACPI_NS_EARLY_INIT) {
this_node->flags |= ANOBJ_NODE_EARLY_INIT;
}
#endif
*return_node = this_node;
return_ACPI_STATUS(AE_OK);
}
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