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arm_addrenv: Add stubs for modifying permissions

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Adds stubs for up_addrenv_text_enable/disable_write. These don't have
to do anything as the ARM MMU allows setting access per mode. Currently
the settings for user .text area grants the kernel write access, but
revokes user write access.
This commit is contained in:
Ville Juven 2022-05-03 08:42:15 +03:00 committed by Masayuki Ishikawa
parent 9af8b740e6
commit 248b738f25
2 changed files with 76 additions and 1 deletions
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2
arch/arm/src/armv7-a/Make.defs
View File

@ -63,7 +63,7 @@ else
endif
ifeq ($(CONFIG_ARCH_ADDRENV),y)
CMN_CSRCS += arm_addrenv.c arm_addrenv_utils.c arm_pgalloc.c
CMN_CSRCS += arm_addrenv.c arm_addrenv_utils.c arm_addrenv_perms.c arm_pgalloc.c
ifeq ($(CONFIG_ARCH_STACK_DYNAMIC),y)
CMN_CSRCS += arm_addrenv_ustack.c
endif

75
arch/arm/src/armv7-a/arm_addrenv_perms.c Normal file
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@ -0,0 +1,75 @@
/****************************************************************************
* arch/arm/src/armv7-a/arm_addrenv_perms.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <nuttx/arch.h>
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: up_addrenv_text_enable_write
*
* Description:
* Temporarily enable write access to the .text section. This must be
* called prior to loading the process code into memory.
*
* Input Parameters:
* addrenv - The address environment to be modified.
*
* Returned Value:
* Zero (OK) on success; a negated errno value on failure.
*
****************************************************************************/
int up_addrenv_text_enable_write(group_addrenv_t *addrenv)
{
/* Nothing needs to be done */
return OK;
}
/****************************************************************************
* Name: up_addrenv_text_disable_write
*
* Description:
* Disable write access to the .text section. This must be called after the
* process code is loaded into memory.
*
* Input Parameters:
* addrenv - The address environment to be modified.
*
* Returned Value:
* Zero (OK) on success; a negated errno value on failure.
*
****************************************************************************/
int up_addrenv_text_disable_write(group_addrenv_t *addrenv)
{
/* Nothing needs to be done */
return OK;
}