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new primitive: vmemdup_user()

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similar to memdup_user(), but does *not* guarantee that result will
be physically contiguous; use only in cases where that's not a requirement
and free it with kvfree().

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2018-01-07 13:06:15 -05:00
parent 6c2c97a24f
commit 50fd2f298b
2 changed files with 29 additions and 1 deletions
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1
include/linux/string.h
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@ -11,6 +11,7 @@
extern char *strndup_user(const char __user *, long);
extern void *memdup_user(const void __user *, size_t);
extern void *vmemdup_user(const void __user *, size_t);
extern void *memdup_user_nul(const void __user *, size_t);
/*