kernel/params.c: use scnprintf() instead of sprintf()

For some strings (e.g. version string), they are permitted to be larger than PAGE_SIZE (although meaningless), so recommend to use scnprintf() instead of sprintf().

Signed-off-by Chen Gang <[email protected]>

---
 kernel/params.c |    7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)

kernel/params.c +4 -3

index 1f228a3..4da300f 100644
@@ -241,7 +241,8 @@ int parse_args(const char *doing,
 	}								\
 	int param_get_##name(char *buffer, const struct kernel_param *kp) \
 	{								\
-		return sprintf(buffer, format, *((type *)kp->arg));	\
+		return scnprintf(buffer, PAGE_SIZE, format,		\
+				*((type *)kp->arg));			\
 	}								\
 	struct kernel_param_ops param_ops_##name = {			\
 		.set = param_set_##name,				\

@@ -285,7 +286,7 @@ EXPORT_SYMBOL(param_set_charp);
 
 int param_get_charp(char *buffer, const struct kernel_param *kp)
 {
-	return sprintf(buffer, "%s", *((char **)kp->arg));
+	return scnprintf(buffer, PAGE_SIZE, "%s", *((char **)kp->arg));
 }
 EXPORT_SYMBOL(param_get_charp);
 

@@ -827,7 +828,7 @@ ssize_t __modver_version_show(struct module_attribute *mattr,
 	struct module_version_attribute *vattr =
 		container_of(mattr, struct module_version_attribute, mattr);
 
-	return sprintf(buf, "%s\n", vattr->version);
+	return scnprintf(buf, PAGE_SIZE, "%s\n", vattr->version);
 }
 
 extern const struct module_version_attribute *__start___modver[];

Signature · 1 line

1.7.7.6

Quoted 3 lines · Chen Gang

For some strings (e.g. version string), they are permitted to be larger than PAGE_SIZE (although meaningless), so recommend to use scnprintf() instead of sprintf().

Applied.

Thanks,
Rusty.

Quoted 40 lines

Signed-off-by Chen Gang <[email protected]>

---
 kernel/params.c |    7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)

kernel/params.c +4 -3

index 1f228a3..4da300f 100644
@@ -241,7 +241,8 @@ int parse_args(const char *doing,
 	}								\
 	int param_get_##name(char *buffer, const struct kernel_param *kp) \
 	{								\
-		return sprintf(buffer, format, *((type *)kp->arg));	\
+		return scnprintf(buffer, PAGE_SIZE, format,		\
+				*((type *)kp->arg));			\
 	}								\
 	struct kernel_param_ops param_ops_##name = {			\
 		.set = param_set_##name,				\

@@ -285,7 +286,7 @@ EXPORT_SYMBOL(param_set_charp);
 
 int param_get_charp(char *buffer, const struct kernel_param *kp)
 {
-	return sprintf(buffer, "%s", *((char **)kp->arg));
+	return scnprintf(buffer, PAGE_SIZE, "%s", *((char **)kp->arg));
 }
 EXPORT_SYMBOL(param_get_charp);
 

@@ -827,7 +828,7 @@ ssize_t __modver_version_show(struct module_attribute *mattr,
 	struct module_version_attribute *vattr =
 		container_of(mattr, struct module_version_attribute, mattr);
 
-	return sprintf(buf, "%s\n", vattr->version);
+	return scnprintf(buf, PAGE_SIZE, "%s\n", vattr->version);
 }
 
 extern const struct module_version_attribute *__start___modver[];

Signature · 1 line

1.7.7.6