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2024-10-09 244b2c5ca8b14627e4a17755e5922221e121c771 
 kernel/arch/sparc/vdso/vma.c
....@@ -1,7 +1,7 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /*
23  * Set up the VMAs to tell the VM about the vDSO.
34  * Copyright 2007 Andi Kleen, SUSE Labs.
4
- * Subject to the GPL, v.2
55  */
66 
77 /*
....@@ -16,6 +16,8 @@
1616 #include <linux/linkage.h>
1717 #include <linux/random.h>
1818 #include <linux/elf.h>
19
+#include <asm/cacheflush.h>
20
+#include <asm/spitfire.h>
1921 #include <asm/vdso.h>
2022 #include <asm/vvar.h>
2123 #include <asm/page.h>
....@@ -40,20 +42,221 @@
4042 
4143 struct vvar_data *vvar_data;
4244 
43
-#define	SAVE_INSTR_SIZE	4
45
+struct vdso_elfinfo32 {
46
+	Elf32_Ehdr	*hdr;
47
+	Elf32_Sym	*dynsym;
48
+	unsigned long	dynsymsize;
49
+	const char	*dynstr;
50
+	unsigned long	text;
51
+};
52
+
53
+struct vdso_elfinfo64 {
54
+	Elf64_Ehdr	*hdr;
55
+	Elf64_Sym	*dynsym;
56
+	unsigned long	dynsymsize;
57
+	const char	*dynstr;
58
+	unsigned long	text;
59
+};
60
+
61
+struct vdso_elfinfo {
62
+	union {
63
+		struct vdso_elfinfo32 elf32;
64
+		struct vdso_elfinfo64 elf64;
65
+	} u;
66
+};
67
+
68
+static void *one_section64(struct vdso_elfinfo64 *e, const char *name,
69
+			   unsigned long *size)
70
+{
71
+	const char *snames;
72
+	Elf64_Shdr *shdrs;
73
+	unsigned int i;
74
+
75
+	shdrs = (void *)e->hdr + e->hdr->e_shoff;
76
+	snames = (void *)e->hdr + shdrs[e->hdr->e_shstrndx].sh_offset;
77
+	for (i = 1; i < e->hdr->e_shnum; i++) {
78
+		if (!strcmp(snames+shdrs[i].sh_name, name)) {
79
+			if (size)
80
+				*size = shdrs[i].sh_size;
81
+			return (void *)e->hdr + shdrs[i].sh_offset;
82
+		}
83
+	}
84
+	return NULL;
85
+}
86
+
87
+static int find_sections64(const struct vdso_image *image, struct vdso_elfinfo *_e)
88
+{
89
+	struct vdso_elfinfo64 *e = &_e->u.elf64;
90
+
91
+	e->hdr = image->data;
92
+	e->dynsym = one_section64(e, ".dynsym", &e->dynsymsize);
93
+	e->dynstr = one_section64(e, ".dynstr", NULL);
94
+
95
+	if (!e->dynsym || !e->dynstr) {
96
+		pr_err("VDSO64: Missing symbol sections.\n");
97
+		return -ENODEV;
98
+	}
99
+	return 0;
100
+}
101
+
102
+static Elf64_Sym *find_sym64(const struct vdso_elfinfo64 *e, const char *name)
103
+{
104
+	unsigned int i;
105
+
106
+	for (i = 0; i < (e->dynsymsize / sizeof(Elf64_Sym)); i++) {
107
+		Elf64_Sym *s = &e->dynsym[i];
108
+		if (s->st_name == 0)
109
+			continue;
110
+		if (!strcmp(e->dynstr + s->st_name, name))
111
+			return s;
112
+	}
113
+	return NULL;
114
+}
115
+
116
+static int patchsym64(struct vdso_elfinfo *_e, const char *orig,
117
+		      const char *new)
118
+{
119
+	struct vdso_elfinfo64 *e = &_e->u.elf64;
120
+	Elf64_Sym *osym = find_sym64(e, orig);
121
+	Elf64_Sym *nsym = find_sym64(e, new);
122
+
123
+	if (!nsym || !osym) {
124
+		pr_err("VDSO64: Missing symbols.\n");
125
+		return -ENODEV;
126
+	}
127
+	osym->st_value = nsym->st_value;
128
+	osym->st_size = nsym->st_size;
129
+	osym->st_info = nsym->st_info;
130
+	osym->st_other = nsym->st_other;
131
+	osym->st_shndx = nsym->st_shndx;
132
+
133
+	return 0;
134
+}
135
+
136
+static void *one_section32(struct vdso_elfinfo32 *e, const char *name,
137
+			   unsigned long *size)
138
+{
139
+	const char *snames;
140
+	Elf32_Shdr *shdrs;
141
+	unsigned int i;
142
+
143
+	shdrs = (void *)e->hdr + e->hdr->e_shoff;
144
+	snames = (void *)e->hdr + shdrs[e->hdr->e_shstrndx].sh_offset;
145
+	for (i = 1; i < e->hdr->e_shnum; i++) {
146
+		if (!strcmp(snames+shdrs[i].sh_name, name)) {
147
+			if (size)
148
+				*size = shdrs[i].sh_size;
149
+			return (void *)e->hdr + shdrs[i].sh_offset;
150
+		}
151
+	}
152
+	return NULL;
153
+}
154
+
155
+static int find_sections32(const struct vdso_image *image, struct vdso_elfinfo *_e)
156
+{
157
+	struct vdso_elfinfo32 *e = &_e->u.elf32;
158
+
159
+	e->hdr = image->data;
160
+	e->dynsym = one_section32(e, ".dynsym", &e->dynsymsize);
161
+	e->dynstr = one_section32(e, ".dynstr", NULL);
162
+
163
+	if (!e->dynsym || !e->dynstr) {
164
+		pr_err("VDSO32: Missing symbol sections.\n");
165
+		return -ENODEV;
166
+	}
167
+	return 0;
168
+}
169
+
170
+static Elf32_Sym *find_sym32(const struct vdso_elfinfo32 *e, const char *name)
171
+{
172
+	unsigned int i;
173
+
174
+	for (i = 0; i < (e->dynsymsize / sizeof(Elf32_Sym)); i++) {
175
+		Elf32_Sym *s = &e->dynsym[i];
176
+		if (s->st_name == 0)
177
+			continue;
178
+		if (!strcmp(e->dynstr + s->st_name, name))
179
+			return s;
180
+	}
181
+	return NULL;
182
+}
183
+
184
+static int patchsym32(struct vdso_elfinfo *_e, const char *orig,
185
+		      const char *new)
186
+{
187
+	struct vdso_elfinfo32 *e = &_e->u.elf32;
188
+	Elf32_Sym *osym = find_sym32(e, orig);
189
+	Elf32_Sym *nsym = find_sym32(e, new);
190
+
191
+	if (!nsym || !osym) {
192
+		pr_err("VDSO32: Missing symbols.\n");
193
+		return -ENODEV;
194
+	}
195
+	osym->st_value = nsym->st_value;
196
+	osym->st_size = nsym->st_size;
197
+	osym->st_info = nsym->st_info;
198
+	osym->st_other = nsym->st_other;
199
+	osym->st_shndx = nsym->st_shndx;
200
+
201
+	return 0;
202
+}
203
+
204
+static int find_sections(const struct vdso_image *image, struct vdso_elfinfo *e,
205
+			 bool elf64)
206
+{
207
+	if (elf64)
208
+		return find_sections64(image, e);
209
+	else
210
+		return find_sections32(image, e);
211
+}
212
+
213
+static int patch_one_symbol(struct vdso_elfinfo *e, const char *orig,
214
+			    const char *new_target, bool elf64)
215
+{
216
+	if (elf64)
217
+		return patchsym64(e, orig, new_target);
218
+	else
219
+		return patchsym32(e, orig, new_target);
220
+}
221
+
222
+static int stick_patch(const struct vdso_image *image, struct vdso_elfinfo *e, bool elf64)
223
+{
224
+	int err;
225
+
226
+	err = find_sections(image, e, elf64);
227
+	if (err)
228
+		return err;
229
+
230
+	err = patch_one_symbol(e,
231
+			       "__vdso_gettimeofday",
232
+			       "__vdso_gettimeofday_stick", elf64);
233
+	if (err)
234
+		return err;
235
+
236
+	return patch_one_symbol(e,
237
+				"__vdso_clock_gettime",
238
+				"__vdso_clock_gettime_stick", elf64);
239
+	return 0;
240
+}
44241 
45242 /*
46243  * Allocate pages for the vdso and vvar, and copy in the vdso text from the
47244  * kernel image.
48245  */
49246 int __init init_vdso_image(const struct vdso_image *image,
50
-		struct vm_special_mapping *vdso_mapping)
247
+			   struct vm_special_mapping *vdso_mapping, bool elf64)
51248 {
52
-	int i;
53
-	struct page *dp, **dpp = NULL;
54
-	int dnpages = 0;
55
-	struct page *cp, **cpp = NULL;
56249 	int cnpages = (image->size) / PAGE_SIZE;
250
+	struct page *dp, **dpp = NULL;
251
+	struct page *cp, **cpp = NULL;
252
+	struct vdso_elfinfo ei;
253
+	int i, dnpages = 0;
254
+
255
+	if (tlb_type != spitfire) {
256
+		int err = stick_patch(image, &ei, elf64);
257
+		if (err)
258
+			return err;
259
+	}
57260 
58261 	/*
59262 	 * First, the vdso text.  This is initialied data, an integral number of
....@@ -67,22 +270,6 @@
67270 
68271 	if (!cpp)
69272 		goto oom;
70
-
71
-	if (vdso_fix_stick) {
72
-		/*
73
-		 * If the system uses %tick instead of %stick, patch the VDSO
74
-		 * with instruction reading %tick instead of %stick.
75
-		 */
76
-		unsigned int j, k = SAVE_INSTR_SIZE;
77
-		unsigned char *data = image->data;
78
-
79
-		for (j = image->sym_vread_tick_patch_start;
80
-		     j < image->sym_vread_tick_patch_end; j++) {
81
-
82
-			data[image->sym_vread_tick + k] = data[j];
83
-			k++;
84
-		}
85
-	}
86273 
87274 	for (i = 0; i < cnpages; i++) {
88275 		cp = alloc_page(GFP_KERNEL);
....@@ -146,13 +333,13 @@
146333 {
147334 	int err = 0;
148335 #ifdef CONFIG_SPARC64
149
-	err = init_vdso_image(&vdso_image_64_builtin, &vdso_mapping64);
336
+	err = init_vdso_image(&vdso_image_64_builtin, &vdso_mapping64, true);
150337 	if (err)
151338 		return err;
152339 #endif
153340 
154341 #ifdef CONFIG_COMPAT
155
-	err = init_vdso_image(&vdso_image_32_builtin, &vdso_mapping32);
342
+	err = init_vdso_image(&vdso_image_32_builtin, &vdso_mapping32, false);
156343 #endif
157344 	return err;
158345 
....@@ -179,7 +366,7 @@
179366 	unsigned long text_start, addr = 0;
180367 	int ret = 0;
181368 
182
-	down_write(&mm->mmap_sem);
369
+	mmap_write_lock(mm);
183370 
184371 	/*
185372 	 * First, get an unmapped region: then randomize it, and make sure that
....@@ -235,7 +422,7 @@
235422 	if (ret)
236423 		current->mm->context.vdso = NULL;
237424 
238
-	up_write(&mm->mmap_sem);
425
+	mmap_write_unlock(mm);
239426 	return ret;
240427 }
241428