linuxkpi: Add strndup_user

Reviewed by: hselasky, markj Differential Revision: https://reviews.freebsd.org/D36350 Sponsored by: Google, Inc. (GSoC 2022)
2022-09-20 19:38:37 +02:00 · 2022-09-20 19:38:37 +02:00 · a11195df34
commit a11195df34
parent a06eeeaa1d
1 changed files with 9 additions and 0 deletions
--- a/sys/compat/linuxkpi/common/include/linux/string.h
+++ b/sys/compat/linuxkpi/common/include/linux/string.h
@ -98,6 +98,15 @@ kmemdup(const void *src, size_t len, gfp_t gfp)
 	return (dst);
 }

+static inline char *
+strndup_user(const char __user *ustr, long n)
+{
+	if (n < 1)
+		return (ERR_PTR(-EINVAL));
+
+	return (memdup_user_nul(ustr, n - 1));
+}
+
 static inline char *
 kstrdup(const char *string, gfp_t gfp)
 {