1#include <linux/mm.h>
2#include <linux/slab.h>
3#include <linux/string.h>
4#include <linux/module.h>
5#include <linux/err.h>
6#include <linux/sched.h>
7#include <asm/uaccess.h>
8
9#define CREATE_TRACE_POINTS
10#include <trace/events/kmem.h>
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17char *kstrdup(const char *s, gfp_t gfp)
18{
19 size_t len;
20 char *buf;
21
22 if (!s)
23 return NULL;
24
25 len = strlen(s) + 1;
26 buf = kmalloc_track_caller(len, gfp);
27 if (buf)
28 memcpy(buf, s, len);
29 return buf;
30}
31EXPORT_SYMBOL(kstrdup);
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39char *kstrndup(const char *s, size_t max, gfp_t gfp)
40{
41 size_t len;
42 char *buf;
43
44 if (!s)
45 return NULL;
46
47 len = strnlen(s, max);
48 buf = kmalloc_track_caller(len+1, gfp);
49 if (buf) {
50 memcpy(buf, s, len);
51 buf[len] = '\0';
52 }
53 return buf;
54}
55EXPORT_SYMBOL(kstrndup);
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63
64void *kmemdup(const void *src, size_t len, gfp_t gfp)
65{
66 void *p;
67
68 p = kmalloc_track_caller(len, gfp);
69 if (p)
70 memcpy(p, src, len);
71 return p;
72}
73EXPORT_SYMBOL(kmemdup);
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83void *memdup_user(const void __user *src, size_t len)
84{
85 void *p;
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92 p = kmalloc_track_caller(len, GFP_KERNEL);
93 if (!p)
94 return ERR_PTR(-ENOMEM);
95
96 if (copy_from_user(p, src, len)) {
97 kfree(p);
98 return ERR_PTR(-EFAULT);
99 }
100
101 return p;
102}
103EXPORT_SYMBOL(memdup_user);
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115void *__krealloc(const void *p, size_t new_size, gfp_t flags)
116{
117 void *ret;
118 size_t ks = 0;
119
120 if (unlikely(!new_size))
121 return ZERO_SIZE_PTR;
122
123 if (p)
124 ks = ksize(p);
125
126 if (ks >= new_size)
127 return (void *)p;
128
129 ret = kmalloc_track_caller(new_size, flags);
130 if (ret && p)
131 memcpy(ret, p, ks);
132
133 return ret;
134}
135EXPORT_SYMBOL(__krealloc);
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148void *krealloc(const void *p, size_t new_size, gfp_t flags)
149{
150 void *ret;
151
152 if (unlikely(!new_size)) {
153 kfree(p);
154 return ZERO_SIZE_PTR;
155 }
156
157 ret = __krealloc(p, new_size, flags);
158 if (ret && p != ret)
159 kfree(p);
160
161 return ret;
162}
163EXPORT_SYMBOL(krealloc);
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175
176void kzfree(const void *p)
177{
178 size_t ks;
179 void *mem = (void *)p;
180
181 if (unlikely(ZERO_OR_NULL_PTR(mem)))
182 return;
183 ks = ksize(mem);
184 memset(mem, 0, ks);
185 kfree(mem);
186}
187EXPORT_SYMBOL(kzfree);
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193
194char *strndup_user(const char __user *s, long n)
195{
196 char *p;
197 long length;
198
199 length = strnlen_user(s, n);
200
201 if (!length)
202 return ERR_PTR(-EFAULT);
203
204 if (length > n)
205 return ERR_PTR(-EINVAL);
206
207 p = memdup_user(s, length);
208
209 if (IS_ERR(p))
210 return p;
211
212 p[length - 1] = '\0';
213
214 return p;
215}
216EXPORT_SYMBOL(strndup_user);
217
218#if defined(CONFIG_MMU) && !defined(HAVE_ARCH_PICK_MMAP_LAYOUT)
219void arch_pick_mmap_layout(struct mm_struct *mm)
220{
221 mm->mmap_base = TASK_UNMAPPED_BASE;
222 mm->get_unmapped_area = arch_get_unmapped_area;
223 mm->unmap_area = arch_unmap_area;
224}
225#endif
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232
233int __attribute__((weak)) __get_user_pages_fast(unsigned long start,
234 int nr_pages, int write, struct page **pages)
235{
236 return 0;
237}
238EXPORT_SYMBOL_GPL(__get_user_pages_fast);
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264int __attribute__((weak)) get_user_pages_fast(unsigned long start,
265 int nr_pages, int write, struct page **pages)
266{
267 struct mm_struct *mm = current->mm;
268 int ret;
269
270 down_read(&mm->mmap_sem);
271 ret = get_user_pages(current, mm, start, nr_pages,
272 write, 0, pages, NULL);
273 up_read(&mm->mmap_sem);
274
275 return ret;
276}
277EXPORT_SYMBOL_GPL(get_user_pages_fast);
278
279
280EXPORT_TRACEPOINT_SYMBOL(kmalloc);
281EXPORT_TRACEPOINT_SYMBOL(kmem_cache_alloc);
282EXPORT_TRACEPOINT_SYMBOL(kmalloc_node);
283EXPORT_TRACEPOINT_SYMBOL(kmem_cache_alloc_node);
284EXPORT_TRACEPOINT_SYMBOL(kfree);
285EXPORT_TRACEPOINT_SYMBOL(kmem_cache_free);
286