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-rw-r--r--lib/kstrtox.c26
1 files changed, 26 insertions, 0 deletions
diff --git a/lib/kstrtox.c b/lib/kstrtox.c
index a235f3cc471c..2dbae88090ac 100644
--- a/lib/kstrtox.c
+++ b/lib/kstrtox.c
@@ -17,6 +17,7 @@
#include <linux/math64.h>
#include <linux/module.h>
#include <linux/types.h>
+#include <asm/uaccess.h>
static inline char _tolower(const char c)
{
@@ -222,3 +223,28 @@ int kstrtos8(const char *s, unsigned int base, s8 *res)
return 0;
}
EXPORT_SYMBOL(kstrtos8);
+
+#define kstrto_from_user(f, g, type) \
+int f(const char __user *s, size_t count, unsigned int base, type *res) \
+{ \
+ /* sign, base 2 representation, newline, terminator */ \
+ char buf[1 + sizeof(type) * 8 + 1 + 1]; \
+ \
+ count = min(count, sizeof(buf) - 1); \
+ if (copy_from_user(buf, s, count)) \
+ return -EFAULT; \
+ buf[count] = '\0'; \
+ return g(buf, base, res); \
+} \
+EXPORT_SYMBOL(f)
+
+kstrto_from_user(kstrtoull_from_user, kstrtoull, unsigned long long);
+kstrto_from_user(kstrtoll_from_user, kstrtoll, long long);
+kstrto_from_user(kstrtoul_from_user, kstrtoul, unsigned long);
+kstrto_from_user(kstrtol_from_user, kstrtol, long);
+kstrto_from_user(kstrtouint_from_user, kstrtouint, unsigned int);
+kstrto_from_user(kstrtoint_from_user, kstrtoint, int);
+kstrto_from_user(kstrtou16_from_user, kstrtou16, u16);
+kstrto_from_user(kstrtos16_from_user, kstrtos16, s16);
+kstrto_from_user(kstrtou8_from_user, kstrtou8, u8);
+kstrto_from_user(kstrtos8_from_user, kstrtos8, s8);