Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
112 lines
2.6 KiB
C
112 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2014, The Linux Foundation. All rights reserved.
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*/
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#include <linux/mm.h>
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#include <linux/module.h>
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#include <asm/tlbflush.h>
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#include <asm/set_memory.h>
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struct page_change_data {
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pgprot_t set_mask;
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pgprot_t clear_mask;
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};
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static int change_page_range(pte_t *ptep, unsigned long addr, void *data)
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{
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struct page_change_data *cdata = data;
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pte_t pte = *ptep;
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pte = clear_pte_bit(pte, cdata->clear_mask);
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pte = set_pte_bit(pte, cdata->set_mask);
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set_pte_ext(ptep, pte, 0);
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return 0;
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}
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static bool range_in_range(unsigned long start, unsigned long size,
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unsigned long range_start, unsigned long range_end)
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{
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return start >= range_start && start < range_end &&
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size <= range_end - start;
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}
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/*
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* This function assumes that the range is mapped with PAGE_SIZE pages.
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*/
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static int __change_memory_common(unsigned long start, unsigned long size,
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pgprot_t set_mask, pgprot_t clear_mask)
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{
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struct page_change_data data;
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int ret;
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data.set_mask = set_mask;
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data.clear_mask = clear_mask;
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ret = apply_to_page_range(&init_mm, start, size, change_page_range,
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&data);
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flush_tlb_kernel_range(start, start + size);
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return ret;
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}
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static int change_memory_common(unsigned long addr, int numpages,
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pgprot_t set_mask, pgprot_t clear_mask)
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{
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unsigned long start = addr & PAGE_MASK;
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unsigned long end = PAGE_ALIGN(addr) + numpages * PAGE_SIZE;
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unsigned long size = end - start;
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WARN_ON_ONCE(start != addr);
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if (!size)
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return 0;
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if (!range_in_range(start, size, MODULES_VADDR, MODULES_END) &&
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!range_in_range(start, size, VMALLOC_START, VMALLOC_END))
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return -EINVAL;
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return __change_memory_common(start, size, set_mask, clear_mask);
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}
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int set_memory_ro(unsigned long addr, int numpages)
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{
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return change_memory_common(addr, numpages,
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__pgprot(L_PTE_RDONLY),
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__pgprot(0));
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}
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int set_memory_rw(unsigned long addr, int numpages)
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{
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return change_memory_common(addr, numpages,
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__pgprot(0),
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__pgprot(L_PTE_RDONLY));
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}
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int set_memory_nx(unsigned long addr, int numpages)
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{
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return change_memory_common(addr, numpages,
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__pgprot(L_PTE_XN),
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__pgprot(0));
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}
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int set_memory_x(unsigned long addr, int numpages)
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{
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return change_memory_common(addr, numpages,
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__pgprot(0),
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__pgprot(L_PTE_XN));
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}
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int set_memory_valid(unsigned long addr, int numpages, int enable)
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{
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if (enable)
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return __change_memory_common(addr, PAGE_SIZE * numpages,
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__pgprot(L_PTE_VALID),
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__pgprot(0));
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else
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return __change_memory_common(addr, PAGE_SIZE * numpages,
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__pgprot(0),
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__pgprot(L_PTE_VALID));
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}
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