1 #include <linux/slab.h>
2 #include <linux/string.h>
3 #include <linux/module.h>
5 #include <asm/uaccess.h>
8 * kstrdup - allocate space for and copy an existing string
10 * @s: the string to duplicate
11 * @gfp: the GFP mask used in the kmalloc() call when allocating memory
13 char *kstrdup(const char *s
, gfp_t gfp
)
22 buf
= kmalloc_track_caller(len
, gfp
);
27 EXPORT_SYMBOL(kstrdup
);
30 * kmemdup - duplicate region of memory
32 * @src: memory region to duplicate
33 * @len: memory region length
34 * @gfp: GFP mask to use
36 void *kmemdup(const void *src
, size_t len
, gfp_t gfp
)
40 p
= kmalloc_track_caller(len
, gfp
);
45 EXPORT_SYMBOL(kmemdup
);
48 * krealloc - reallocate memory. The contents will remain unchanged.
49 * @p: object to reallocate memory for.
50 * @new_size: how many bytes of memory are required.
51 * @flags: the type of memory to allocate.
53 * The contents of the object pointed to are preserved up to the
54 * lesser of the new and old sizes. If @p is %NULL, krealloc()
55 * behaves exactly like kmalloc(). If @size is 0 and @p is not a
56 * %NULL pointer, the object pointed to is freed.
58 void *krealloc(const void *p
, size_t new_size
, gfp_t flags
)
63 if (unlikely(!new_size
)) {
72 ret
= kmalloc_track_caller(new_size
, flags
);
74 memcpy(ret
, p
, min(new_size
, ks
));
79 EXPORT_SYMBOL(krealloc
);
82 * strndup_user - duplicate an existing string from user space
84 * @s: The string to duplicate
85 * @n: Maximum number of bytes to copy, including the trailing NUL.
87 char *strndup_user(const char __user
*s
, long n
)
92 length
= strnlen_user(s
, n
);
95 return ERR_PTR(-EFAULT
);
98 return ERR_PTR(-EINVAL
);
100 p
= kmalloc(length
, GFP_KERNEL
);
103 return ERR_PTR(-ENOMEM
);
105 if (copy_from_user(p
, s
, length
)) {
107 return ERR_PTR(-EFAULT
);
110 p
[length
- 1] = '\0';
114 EXPORT_SYMBOL(strndup_user
);
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