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author | Laura Abbott <lauraa@codeaurora.org> | 2014-08-19 20:41:43 +0100 |
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committer | Will Deacon <will.deacon@arm.com> | 2014-09-08 14:39:18 +0100 |
commit | 11d91a770f1fff44dafdf88d6089a3451f99c9b6 (patch) | |
tree | db7874516b61d7df4d85e4529b9ea6e1033624e6 /arch/arm64/mm/pageattr.c | |
parent | b6d4f2800b7bad654caf00654f4bff21594ef838 (diff) | |
download | linux-11d91a770f1fff44dafdf88d6089a3451f99c9b6.tar.gz linux-11d91a770f1fff44dafdf88d6089a3451f99c9b6.tar.bz2 linux-11d91a770f1fff44dafdf88d6089a3451f99c9b6.zip |
arm64: Add CONFIG_DEBUG_SET_MODULE_RONX support
In a similar fashion to other architecture, add the infrastructure
and Kconfig to enable DEBUG_SET_MODULE_RONX support. When
enabled, module ranges will be marked read-only/no-execute as
appropriate.
Signed-off-by: Laura Abbott <lauraa@codeaurora.org>
[will: fixed off-by-one in module end check]
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/mm/pageattr.c')
-rw-r--r-- | arch/arm64/mm/pageattr.c | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/arch/arm64/mm/pageattr.c b/arch/arm64/mm/pageattr.c new file mode 100644 index 000000000000..75e744e4cec5 --- /dev/null +++ b/arch/arm64/mm/pageattr.c @@ -0,0 +1,96 @@ +/* + * Copyright (c) 2014, The Linux Foundation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only version 2 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. + */ +#include <linux/kernel.h> +#include <linux/mm.h> +#include <linux/module.h> +#include <linux/sched.h> + +#include <asm/pgtable.h> +#include <asm/tlbflush.h> + +struct page_change_data { + pgprot_t set_mask; + pgprot_t clear_mask; +}; + +static int change_page_range(pte_t *ptep, pgtable_t token, unsigned long addr, + void *data) +{ + struct page_change_data *cdata = data; + pte_t pte = *ptep; + + pte = clear_pte_bit(pte, cdata->clear_mask); + pte = set_pte_bit(pte, cdata->set_mask); + + set_pte(ptep, pte); + return 0; +} + +static int change_memory_common(unsigned long addr, int numpages, + pgprot_t set_mask, pgprot_t clear_mask) +{ + unsigned long start = addr; + unsigned long size = PAGE_SIZE*numpages; + unsigned long end = start + size; + int ret; + struct page_change_data data; + + if (!IS_ALIGNED(addr, PAGE_SIZE)) { + addr &= PAGE_MASK; + WARN_ON_ONCE(1); + } + + if (!is_module_address(start) || !is_module_address(end - 1)) + return -EINVAL; + + data.set_mask = set_mask; + data.clear_mask = clear_mask; + + ret = apply_to_page_range(&init_mm, start, size, change_page_range, + &data); + + flush_tlb_kernel_range(start, end); + return ret; +} + +int set_memory_ro(unsigned long addr, int numpages) +{ + return change_memory_common(addr, numpages, + __pgprot(PTE_RDONLY), + __pgprot(PTE_WRITE)); +} +EXPORT_SYMBOL_GPL(set_memory_ro); + +int set_memory_rw(unsigned long addr, int numpages) +{ + return change_memory_common(addr, numpages, + __pgprot(PTE_WRITE), + __pgprot(PTE_RDONLY)); +} +EXPORT_SYMBOL_GPL(set_memory_rw); + +int set_memory_nx(unsigned long addr, int numpages) +{ + return change_memory_common(addr, numpages, + __pgprot(PTE_PXN), + __pgprot(0)); +} +EXPORT_SYMBOL_GPL(set_memory_nx); + +int set_memory_x(unsigned long addr, int numpages) +{ + return change_memory_common(addr, numpages, + __pgprot(0), + __pgprot(PTE_PXN)); +} +EXPORT_SYMBOL_GPL(set_memory_x); |