]>
Commit | Line | Data |
---|---|---|
30992c97 MM |
1 | #include <linux/slab.h> |
2 | #include <linux/string.h> | |
3 | #include <linux/module.h> | |
96840aa0 DA |
4 | #include <linux/err.h> |
5 | #include <asm/uaccess.h> | |
30992c97 MM |
6 | |
7 | /** | |
40c07ae8 | 8 | * __kzalloc - allocate memory. The memory is set to zero. |
30992c97 MM |
9 | * @size: how many bytes of memory are required. |
10 | * @flags: the type of memory to allocate. | |
11 | */ | |
40c07ae8 | 12 | void *__kzalloc(size_t size, gfp_t flags) |
30992c97 | 13 | { |
871751e2 | 14 | void *ret = ____kmalloc(size, flags); |
30992c97 MM |
15 | if (ret) |
16 | memset(ret, 0, size); | |
17 | return ret; | |
18 | } | |
40c07ae8 | 19 | EXPORT_SYMBOL(__kzalloc); |
30992c97 MM |
20 | |
21 | /* | |
22 | * kstrdup - allocate space for and copy an existing string | |
23 | * | |
24 | * @s: the string to duplicate | |
25 | * @gfp: the GFP mask used in the kmalloc() call when allocating memory | |
26 | */ | |
27 | char *kstrdup(const char *s, gfp_t gfp) | |
28 | { | |
29 | size_t len; | |
30 | char *buf; | |
31 | ||
32 | if (!s) | |
33 | return NULL; | |
34 | ||
35 | len = strlen(s) + 1; | |
871751e2 | 36 | buf = ____kmalloc(len, gfp); |
30992c97 MM |
37 | if (buf) |
38 | memcpy(buf, s, len); | |
39 | return buf; | |
40 | } | |
41 | EXPORT_SYMBOL(kstrdup); | |
96840aa0 | 42 | |
1a2f67b4 AD |
43 | /** |
44 | * kmemdup - duplicate region of memory | |
45 | * | |
46 | * @src: memory region to duplicate | |
47 | * @len: memory region length | |
48 | * @gfp: GFP mask to use | |
49 | */ | |
50 | void *kmemdup(const void *src, size_t len, gfp_t gfp) | |
51 | { | |
52 | void *p; | |
53 | ||
54 | p = ____kmalloc(len, gfp); | |
55 | if (p) | |
56 | memcpy(p, src, len); | |
57 | return p; | |
58 | } | |
59 | EXPORT_SYMBOL(kmemdup); | |
60 | ||
96840aa0 DA |
61 | /* |
62 | * strndup_user - duplicate an existing string from user space | |
63 | * | |
64 | * @s: The string to duplicate | |
65 | * @n: Maximum number of bytes to copy, including the trailing NUL. | |
66 | */ | |
67 | char *strndup_user(const char __user *s, long n) | |
68 | { | |
69 | char *p; | |
70 | long length; | |
71 | ||
72 | length = strnlen_user(s, n); | |
73 | ||
74 | if (!length) | |
75 | return ERR_PTR(-EFAULT); | |
76 | ||
77 | if (length > n) | |
78 | return ERR_PTR(-EINVAL); | |
79 | ||
80 | p = kmalloc(length, GFP_KERNEL); | |
81 | ||
82 | if (!p) | |
83 | return ERR_PTR(-ENOMEM); | |
84 | ||
85 | if (copy_from_user(p, s, length)) { | |
86 | kfree(p); | |
87 | return ERR_PTR(-EFAULT); | |
88 | } | |
89 | ||
90 | p[length - 1] = '\0'; | |
91 | ||
92 | return p; | |
93 | } | |
94 | EXPORT_SYMBOL(strndup_user); |