mirror of
https://github.com/torvalds/linux.git
synced 2024-11-10 22:21:40 +00:00
f9d94b57e3
As recently Smatch suggested, a couple of places in ASIHPI driver may expand the array directly from the user-space value with speculation: sound/pci/asihpi/hpimsginit.c:70 hpi_init_response() warn: potential spectre issue 'res_size' (local cap) sound/pci/asihpi/hpioctl.c:189 asihpi_hpi_ioctl() warn: potential spectre issue 'adapters' This patch puts array_index_nospec() for hardening against them. BugLink: https://marc.info/?l=linux-kernel&m=152411496503418&w=2 Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Cc: <stable@vger.kernel.org> Signed-off-by: Takashi Iwai <tiwai@suse.de>
132 lines
3.7 KiB
C
132 lines
3.7 KiB
C
/******************************************************************************
|
|
|
|
AudioScience HPI driver
|
|
Copyright (C) 1997-2014 AudioScience Inc. <support@audioscience.com>
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of version 2 of the GNU General Public License as
|
|
published by the Free Software Foundation;
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
|
|
Hardware Programming Interface (HPI) Utility functions.
|
|
|
|
(C) Copyright AudioScience Inc. 2007
|
|
*******************************************************************************/
|
|
|
|
#include "hpi_internal.h"
|
|
#include "hpimsginit.h"
|
|
#include <linux/nospec.h>
|
|
|
|
/* The actual message size for each object type */
|
|
static u16 msg_size[HPI_OBJ_MAXINDEX + 1] = HPI_MESSAGE_SIZE_BY_OBJECT;
|
|
/* The actual response size for each object type */
|
|
static u16 res_size[HPI_OBJ_MAXINDEX + 1] = HPI_RESPONSE_SIZE_BY_OBJECT;
|
|
/* Flag to enable alternate message type for SSX2 bypass. */
|
|
static u16 gwSSX2_bypass;
|
|
|
|
/** \internal
|
|
* initialize the HPI message structure
|
|
*/
|
|
static void hpi_init_message(struct hpi_message *phm, u16 object,
|
|
u16 function)
|
|
{
|
|
u16 size;
|
|
|
|
if ((object > 0) && (object <= HPI_OBJ_MAXINDEX)) {
|
|
object = array_index_nospec(object, HPI_OBJ_MAXINDEX + 1);
|
|
size = msg_size[object];
|
|
} else {
|
|
size = sizeof(*phm);
|
|
}
|
|
|
|
memset(phm, 0, size);
|
|
phm->size = size;
|
|
|
|
if (gwSSX2_bypass)
|
|
phm->type = HPI_TYPE_SSX2BYPASS_MESSAGE;
|
|
else
|
|
phm->type = HPI_TYPE_REQUEST;
|
|
phm->object = object;
|
|
phm->function = function;
|
|
phm->version = 0;
|
|
phm->adapter_index = HPI_ADAPTER_INDEX_INVALID;
|
|
/* Expect actual adapter index to be set by caller */
|
|
}
|
|
|
|
/** \internal
|
|
* initialize the HPI response structure
|
|
*/
|
|
void hpi_init_response(struct hpi_response *phr, u16 object, u16 function,
|
|
u16 error)
|
|
{
|
|
u16 size;
|
|
|
|
if ((object > 0) && (object <= HPI_OBJ_MAXINDEX)) {
|
|
object = array_index_nospec(object, HPI_OBJ_MAXINDEX + 1);
|
|
size = res_size[object];
|
|
} else {
|
|
size = sizeof(*phr);
|
|
}
|
|
|
|
memset(phr, 0, sizeof(*phr));
|
|
phr->size = size;
|
|
phr->type = HPI_TYPE_RESPONSE;
|
|
phr->object = object;
|
|
phr->function = function;
|
|
phr->error = error;
|
|
phr->specific_error = 0;
|
|
phr->version = 0;
|
|
}
|
|
|
|
void hpi_init_message_response(struct hpi_message *phm,
|
|
struct hpi_response *phr, u16 object, u16 function)
|
|
{
|
|
hpi_init_message(phm, object, function);
|
|
/* default error return if the response is
|
|
not filled in by the callee */
|
|
hpi_init_response(phr, object, function,
|
|
HPI_ERROR_PROCESSING_MESSAGE);
|
|
}
|
|
|
|
static void hpi_init_messageV1(struct hpi_message_header *phm, u16 size,
|
|
u16 object, u16 function)
|
|
{
|
|
memset(phm, 0, size);
|
|
if ((object > 0) && (object <= HPI_OBJ_MAXINDEX)) {
|
|
phm->size = size;
|
|
phm->type = HPI_TYPE_REQUEST;
|
|
phm->object = object;
|
|
phm->function = function;
|
|
phm->version = 1;
|
|
/* Expect adapter index to be set by caller */
|
|
}
|
|
}
|
|
|
|
void hpi_init_responseV1(struct hpi_response_header *phr, u16 size,
|
|
u16 object, u16 function)
|
|
{
|
|
(void)object;
|
|
(void)function;
|
|
memset(phr, 0, size);
|
|
phr->size = size;
|
|
phr->version = 1;
|
|
phr->type = HPI_TYPE_RESPONSE;
|
|
phr->error = HPI_ERROR_PROCESSING_MESSAGE;
|
|
}
|
|
|
|
void hpi_init_message_responseV1(struct hpi_message_header *phm, u16 msg_size,
|
|
struct hpi_response_header *phr, u16 res_size, u16 object,
|
|
u16 function)
|
|
{
|
|
hpi_init_messageV1(phm, msg_size, object, function);
|
|
hpi_init_responseV1(phr, res_size, object, function);
|
|
}
|