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34cfb106d1
Currently the sram-exec functionality, which allows allocation of
executable memory and provides an API to move code to it, is only
selected in configs for the ARM architecture. Based on commit
5756e9dd0d ("ARM: 6640/1: Thumb-2: Symbol manipulation macros for
function body copying") simply copying a C function pointer address
using memcpy without consideration of alignment and Thumb is unsafe on
ARM platforms.
The aforementioned patch introduces the fncpy macro which is a safe way
to copy executable code on ARM platforms, so let's make use of that here
rather than the unsafe plain memcpy that was previously used by
sram_exec_copy. Now sram_exec_copy will move the code to "dst" and
return an address that is guaranteed to be safely callable.
In the future, architectures hoping to make use of the sram-exec
functionality must define an fncpy macro just as ARM has done to
guarantee or check for safe copying to executable memory before allowing
the arch to select CONFIG_SRAM_EXEC.
Acked-by: Tony Lindgren <tony@atomide.com>
Acked-by: Russell King <rmk+kernel@armlinux.org.uk>
Reviewed-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: Dave Gerlach <d-gerlach@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
120 lines
3.6 KiB
C
120 lines
3.6 KiB
C
/*
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* SRAM protect-exec region helper functions
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*
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* Copyright (C) 2017 Texas Instruments Incorporated - http://www.ti.com/
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* Dave Gerlach
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any
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* kind, whether express or implied; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/device.h>
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#include <linux/genalloc.h>
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#include <linux/mm.h>
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#include <linux/sram.h>
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#include <asm/fncpy.h>
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#include <asm/set_memory.h>
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#include "sram.h"
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static DEFINE_MUTEX(exec_pool_list_mutex);
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static LIST_HEAD(exec_pool_list);
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int sram_check_protect_exec(struct sram_dev *sram, struct sram_reserve *block,
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struct sram_partition *part)
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{
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unsigned long base = (unsigned long)part->base;
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unsigned long end = base + block->size;
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if (!PAGE_ALIGNED(base) || !PAGE_ALIGNED(end)) {
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dev_err(sram->dev,
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"SRAM pool marked with 'protect-exec' is not page aligned and will not be created.\n");
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return -ENOMEM;
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}
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return 0;
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}
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int sram_add_protect_exec(struct sram_partition *part)
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{
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mutex_lock(&exec_pool_list_mutex);
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list_add_tail(&part->list, &exec_pool_list);
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mutex_unlock(&exec_pool_list_mutex);
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return 0;
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}
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/**
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* sram_exec_copy - copy data to a protected executable region of sram
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*
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* @pool: struct gen_pool retrieved that is part of this sram
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* @dst: Destination address for the copy, that must be inside pool
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* @src: Source address for the data to copy
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* @size: Size of copy to perform, which starting from dst, must reside in pool
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*
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* Return: Address for copied data that can safely be called through function
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* pointer, or NULL if problem.
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*
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* This helper function allows sram driver to act as central control location
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* of 'protect-exec' pools which are normal sram pools but are always set
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* read-only and executable except when copying data to them, at which point
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* they are set to read-write non-executable, to make sure no memory is
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* writeable and executable at the same time. This region must be page-aligned
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* and is checked during probe, otherwise page attribute manipulation would
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* not be possible. Care must be taken to only call the returned address as
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* dst address is not guaranteed to be safely callable.
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*
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* NOTE: This function uses the fncpy macro to move code to the executable
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* region. Some architectures have strict requirements for relocating
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* executable code, so fncpy is a macro that must be defined by any arch
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* making use of this functionality that guarantees a safe copy of exec
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* data and returns a safe address that can be called as a C function
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* pointer.
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*/
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void *sram_exec_copy(struct gen_pool *pool, void *dst, void *src,
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size_t size)
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{
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struct sram_partition *part = NULL, *p;
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unsigned long base;
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int pages;
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void *dst_cpy;
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mutex_lock(&exec_pool_list_mutex);
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list_for_each_entry(p, &exec_pool_list, list) {
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if (p->pool == pool)
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part = p;
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}
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mutex_unlock(&exec_pool_list_mutex);
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if (!part)
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return NULL;
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if (!addr_in_gen_pool(pool, (unsigned long)dst, size))
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return NULL;
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base = (unsigned long)part->base;
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pages = PAGE_ALIGN(size) / PAGE_SIZE;
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mutex_lock(&part->lock);
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set_memory_nx((unsigned long)base, pages);
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set_memory_rw((unsigned long)base, pages);
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dst_cpy = fncpy(dst, src, size);
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set_memory_ro((unsigned long)base, pages);
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set_memory_x((unsigned long)base, pages);
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mutex_unlock(&part->lock);
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return dst_cpy;
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}
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EXPORT_SYMBOL_GPL(sram_exec_copy);
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