Create the kstrtobool_from_user helper and moves strtobool logic into
the new kstrtobool (matching all the other kstrto* functions). Provides
an inline wrapper for existing strtobool callers.
Signed-off-by: Kees Cook <keesc...@chromium.org>
---
include/linux/kernel.h | 3 +++
include/linux/string.h | 6 +++++-
lib/kstrtox.c | 35 +++++++++++++++++++++++++++++++++++
lib/string.c | 29 -----------------------------
4 files changed, 43 insertions(+), 30 deletions(-)
diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index f31638c6e873..cdc25f47a23f 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -357,6 +357,7 @@ int __must_check kstrtou16(const char *s, unsigned int
base, u16 *res);
int __must_check kstrtos16(const char *s, unsigned int base, s16 *res);
int __must_check kstrtou8(const char *s, unsigned int base, u8 *res);
int __must_check kstrtos8(const char *s, unsigned int base, s8 *res);
+int __must_check kstrtobool(const char *s, unsigned int base, bool *res);
int __must_check kstrtoull_from_user(const char __user *s, size_t count,
unsigned int base, unsigned long long *res);
int __must_check kstrtoll_from_user(const char __user *s, size_t count,
unsigned int base, long long *res);
@@ -368,6 +369,8 @@ int __must_check kstrtou16_from_user(const char __user *s,
size_t count, unsigne
int __must_check kstrtos16_from_user(const char __user *s, size_t count,
unsigned int base, s16 *res);
int __must_check kstrtou8_from_user(const char __user *s, size_t count,
unsigned int base, u8 *res);
int __must_check kstrtos8_from_user(const char __user *s, size_t count,
unsigned int base, s8 *res);
+int __must_check kstrtobool_from_user(const char __user *s, size_t count,
+ unsigned int base, bool *res);
static inline int __must_check kstrtou64_from_user(const char __user *s,
size_t count, unsigned int base, u64 *res)
{
diff --git a/include/linux/string.h b/include/linux/string.h
index 9eebc66d957a..d2fb21b1081d 100644
--- a/include/linux/string.h
+++ b/include/linux/string.h
@@ -128,7 +128,11 @@ extern char **argv_split(gfp_t gfp, const char *str, int
*argcp);
extern void argv_free(char **argv);
extern bool sysfs_streq(const char *s1, const char *s2);
-extern int strtobool(const char *s, bool *res);
+extern int kstrtobool(const char *s, unsigned int base, bool *res);
+static inline int strtobool(const char *s, bool *res)
+{
+ return kstrtobool(s, 0, res);
+}
#ifdef CONFIG_BINARY_PRINTF
int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args);
diff --git a/lib/kstrtox.c b/lib/kstrtox.c
index 94be244e8441..e18f088704d7 100644
--- a/lib/kstrtox.c
+++ b/lib/kstrtox.c
@@ -321,6 +321,40 @@ int kstrtos8(const char *s, unsigned int base, s8 *res)
}
EXPORT_SYMBOL(kstrtos8);
+/**
+ * kstrtobool - convert common user inputs into boolean values
+ * @s: input string
+ * @base: ignored
+ * @res: result
+ *
+ * This routine returns 0 iff the first character is one of 'Yy1Nn0'.
+ * Otherwise it will return -EINVAL. Value pointed to by res is
+ * updated upon finding a match.
+ */
+int kstrtobool(const char *s, unsigned int base, bool *res)
+{
+ if (!s)
+ return -EINVAL;
+
+ switch (s[0]) {
+ case 'y':
+ case 'Y':
+ case '1':
+ *res = true;
+ return 0;
+ case 'n':
+ case 'N':
+ case '0':
+ *res = false;
+ return 0;
+ default:
+ break;
+ }
+
+ return -EINVAL;
+}
+EXPORT_SYMBOL(kstrtobool);
+
#define kstrto_from_user(f, g, type) \
int f(const char __user *s, size_t count, unsigned int base, type *res)
\
{ \
@@ -345,3 +379,4 @@ 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);
+kstrto_from_user(kstrtobool_from_user, kstrtobool, bool);
diff --git a/lib/string.c b/lib/string.c
index 0323c0d5629a..1a90db9bc6e1 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -630,35 +630,6 @@ bool sysfs_streq(const char *s1, const char *s2)
}
EXPORT_SYMBOL(sysfs_streq);
-/**
- * strtobool - convert common user inputs into boolean values
- * @s: input string
- * @res: result
- *
- * This routine returns 0 iff the first character is one of 'Yy1Nn0'.
- * Otherwise it will return -EINVAL. Value pointed to by res is
- * updated upon finding a match.
- */
-int strtobool(const char *s, bool *res)
-{
- switch (s[0]) {
- case 'y':
- case 'Y':
- case '1':
- *res = true;
- break;
- case 'n':
- case 'N':
- case '0':
- *res = false;
- break;
- default:
- return -EINVAL;
- }
- return 0;
-}
-EXPORT_SYMBOL(strtobool);
-
#ifndef __HAVE_ARCH_MEMSET
/**
* memset - Fill a region of memory with the given value
--
2.6.3
