2 #include <linux/slab.h>
3 #include <linux/string.h>
4 #include <linux/module.h>
6 #include <linux/sched.h>
7 #include <asm/uaccess.h>
10 * kstrdup - allocate space for and copy an existing string
11 * @s: the string to duplicate
12 * @gfp: the GFP mask used in the kmalloc() call when allocating memory
14 char *kstrdup(const char *s
, gfp_t gfp
)
23 buf
= kmalloc_track_caller(len
, gfp
);
28 EXPORT_SYMBOL(kstrdup
);
31 * kstrndup - allocate space for and copy an existing string
32 * @s: the string to duplicate
33 * @max: read at most @max chars from @s
34 * @gfp: the GFP mask used in the kmalloc() call when allocating memory
36 char *kstrndup(const char *s
, size_t max
, gfp_t gfp
)
44 len
= strnlen(s
, max
);
45 buf
= kmalloc_track_caller(len
+1, gfp
);
52 EXPORT_SYMBOL(kstrndup
);
55 * kmemdup - duplicate region of memory
57 * @src: memory region to duplicate
58 * @len: memory region length
59 * @gfp: GFP mask to use
61 void *kmemdup(const void *src
, size_t len
, gfp_t gfp
)
65 p
= kmalloc_track_caller(len
, gfp
);
70 EXPORT_SYMBOL(kmemdup
);
73 * krealloc - reallocate memory. The contents will remain unchanged.
74 * @p: object to reallocate memory for.
75 * @new_size: how many bytes of memory are required.
76 * @flags: the type of memory to allocate.
78 * The contents of the object pointed to are preserved up to the
79 * lesser of the new and old sizes. If @p is %NULL, krealloc()
80 * behaves exactly like kmalloc(). If @size is 0 and @p is not a
81 * %NULL pointer, the object pointed to is freed.
83 void *krealloc(const void *p
, size_t new_size
, gfp_t flags
)
88 if (unlikely(!new_size
)) {
99 ret
= kmalloc_track_caller(new_size
, flags
);
106 EXPORT_SYMBOL(krealloc
);
109 * strndup_user - duplicate an existing string from user space
110 * @s: The string to duplicate
111 * @n: Maximum number of bytes to copy, including the trailing NUL.
113 char *strndup_user(const char __user
*s
, long n
)
118 length
= strnlen_user(s
, n
);
121 return ERR_PTR(-EFAULT
);
124 return ERR_PTR(-EINVAL
);
126 p
= kmalloc(length
, GFP_KERNEL
);
129 return ERR_PTR(-ENOMEM
);
131 if (copy_from_user(p
, s
, length
)) {
133 return ERR_PTR(-EFAULT
);
136 p
[length
- 1] = '\0';
140 EXPORT_SYMBOL(strndup_user
);
142 #ifndef HAVE_ARCH_PICK_MMAP_LAYOUT
143 void arch_pick_mmap_layout(struct mm_struct
*mm
)
145 mm
->mmap_base
= TASK_UNMAPPED_BASE
;
146 mm
->get_unmapped_area
= arch_get_unmapped_area
;
147 mm
->unmap_area
= arch_unmap_area
;
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