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2023-12-11 d2ccde1c8e90d38cee87a1b0309ad2827f3fd30d 
 kernel/arch/arm64/mm/pageattr.c
....@@ -1,14 +1,6 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /*
23  * Copyright (c) 2014, The Linux Foundation. All rights reserved.
3
- *
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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 and
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- * only version 2 as published by the Free Software Foundation.
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- *
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- * This program is distributed in the hope that it will be useful,
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- * but WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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- * GNU General Public License for more details.
124  */
135 #include <linux/kernel.h>
146 #include <linux/mm.h>
....@@ -16,7 +8,7 @@
168 #include <linux/sched.h>
179 #include <linux/vmalloc.h>
1810 
19
-#include <asm/pgtable.h>
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+#include <asm/cacheflush.h>
2012 #include <asm/set_memory.h>
2113 #include <asm/tlbflush.h>
2214 
....@@ -25,8 +17,9 @@
2517 	pgprot_t clear_mask;
2618 };
2719 
28
-static int change_page_range(pte_t *ptep, pgtable_t token, unsigned long addr,
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-			void *data)
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+bool rodata_full __ro_after_init = IS_ENABLED(CONFIG_RODATA_FULL_DEFAULT_ENABLED);
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+
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+static int change_page_range(pte_t *ptep, unsigned long addr, void *data)
3023 {
3124 	struct page_change_data *cdata = data;
3225 	pte_t pte = READ_ONCE(*ptep);
....@@ -61,9 +54,10 @@
6154 				pgprot_t set_mask, pgprot_t clear_mask)
6255 {
6356 	unsigned long start = addr;
64
-	unsigned long size = PAGE_SIZE*numpages;
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+	unsigned long size = PAGE_SIZE * numpages;
6558 	unsigned long end = start + size;
6659 	struct vm_struct *area;
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+	int i;
6761 
6862 	if (!PAGE_ALIGNED(addr)) {
6963 		start &= PAGE_MASK;
....@@ -93,6 +87,24 @@
9387 	if (!numpages)
9488 		return 0;
9589 
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+	/*
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+	 * If we are manipulating read-only permissions, apply the same
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+	 * change to the linear mapping of the pages that back this VM area.
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+	 */
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+	if (rodata_full && (pgprot_val(set_mask) == PTE_RDONLY ||
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+			    pgprot_val(clear_mask) == PTE_RDONLY)) {
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+		for (i = 0; i < area->nr_pages; i++) {
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+			__change_memory_common((u64)page_address(area->pages[i]),
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+					       PAGE_SIZE, set_mask, clear_mask);
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+		}
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+	}
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+
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+	/*
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+	 * Get rid of potentially aliasing lazily unmapped vm areas that may
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+	 * have permissions set that deviate from the ones we are setting here.
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+	 */
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+	vm_unmap_aliases();
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+
96108 	return __change_memory_common(start, size, set_mask, clear_mask);
97109 }
98110 
....@@ -114,17 +126,15 @@
114126 {
115127 	return change_memory_common(addr, numpages,
116128 					__pgprot(PTE_PXN),
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-					__pgprot(0));
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+					__pgprot(PTE_MAYBE_GP));
118130 }
119
-EXPORT_SYMBOL_GPL(set_memory_nx);
120131 
121132 int set_memory_x(unsigned long addr, int numpages)
122133 {
123134 	return change_memory_common(addr, numpages,
124
-					__pgprot(0),
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+					__pgprot(PTE_MAYBE_GP),
125136 					__pgprot(PTE_PXN));
126137 }
127
-EXPORT_SYMBOL_GPL(set_memory_x);
128138 
129139 int set_memory_valid(unsigned long addr, int numpages, int enable)
130140 {
....@@ -138,17 +148,48 @@
138148 					__pgprot(PTE_VALID));
139149 }
140150 
141
-#ifdef CONFIG_DEBUG_PAGEALLOC
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+int set_direct_map_invalid_noflush(struct page *page)
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+{
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+	struct page_change_data data = {
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+		.set_mask = __pgprot(0),
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+		.clear_mask = __pgprot(PTE_VALID),
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+	};
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+
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+	if (!rodata_full)
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+		return 0;
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+
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+	return apply_to_page_range(&init_mm,
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+				   (unsigned long)page_address(page),
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+				   PAGE_SIZE, change_page_range, &data);
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+}
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+
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+int set_direct_map_default_noflush(struct page *page)
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+{
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+	struct page_change_data data = {
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+		.set_mask = __pgprot(PTE_VALID | PTE_WRITE),
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+		.clear_mask = __pgprot(PTE_RDONLY),
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+	};
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+
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+	if (!rodata_full)
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+		return 0;
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+
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+	return apply_to_page_range(&init_mm,
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+				   (unsigned long)page_address(page),
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+				   PAGE_SIZE, change_page_range, &data);
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+}
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+
142181 void __kernel_map_pages(struct page *page, int numpages, int enable)
143182 {
183
+	if (!debug_pagealloc_enabled() && !rodata_full)
184
+		return;
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+
144186 	set_memory_valid((unsigned long)page_address(page), numpages, enable);
145187 }
146
-#ifdef CONFIG_HIBERNATION
188
+
147189 /*
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- * When built with CONFIG_DEBUG_PAGEALLOC and CONFIG_HIBERNATION, this function
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- * is used to determine if a linear map page has been marked as not-valid by
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- * CONFIG_DEBUG_PAGEALLOC. Walk the page table and check the PTE_VALID bit.
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- * This is based on kern_addr_valid(), which almost does what we need.
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+ * This function is used to determine if a linear map page has been marked as
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+ * not-valid. Walk the page table and check the PTE_VALID bit. This is based
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+ * on kern_addr_valid(), which almost does what we need.
152193  *
153194  * Because this is only called on the kernel linear map,  p?d_sect() implies
154195  * p?d_present(). When debug_pagealloc is enabled, sections mappings are
....@@ -157,16 +198,24 @@
157198 bool kernel_page_present(struct page *page)
158199 {
159200 	pgd_t *pgdp;
201
+	p4d_t *p4dp;
160202 	pud_t *pudp, pud;
161203 	pmd_t *pmdp, pmd;
162204 	pte_t *ptep;
163205 	unsigned long addr = (unsigned long)page_address(page);
164206 
207
+	if (!debug_pagealloc_enabled() && !rodata_full)
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+		return true;
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+
165210 	pgdp = pgd_offset_k(addr);
166211 	if (pgd_none(READ_ONCE(*pgdp)))
167212 		return false;
168213 
169
-	pudp = pud_offset(pgdp, addr);
214
+	p4dp = p4d_offset(pgdp, addr);
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+	if (p4d_none(READ_ONCE(*p4dp)))
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+		return false;
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+
218
+	pudp = pud_offset(p4dp, addr);
170219 	pud = READ_ONCE(*pudp);
171220 	if (pud_none(pud))
172221 		return false;
....@@ -183,5 +232,3 @@
183232 	ptep = pte_offset_kernel(pmdp, addr);
184233 	return pte_valid(READ_ONCE(*ptep));
185234 }
186
-#endif /* CONFIG_HIBERNATION */
187
-#endif /* CONFIG_DEBUG_PAGEALLOC */