[PATCH for-next 24/25] string.h: Introduce memset_startat() for wiping trailing members and padding

[Kees Cook <keescook@chromium.org>]

A common idiom in kernel code is to wipe the contents of a structure
starting from a given member. These open-coded cases are usually difficult
to read and very sensitive to struct layout changes. Like memset_after(),
introduce a new helper, memset_startat() that takes the target struct
instance, the byte to write, and the member name where zeroing should
start.

Note that this doesn't zero padding preceding the target member. For
those cases, memset_after() should be used on the preceding member.

Signed-off-by: Kees Cook <keescook@chromium.org>
---
 include/linux/string.h | 18 ++++++++++++++++++
 lib/test_memcpy.c      | 11 +++++++++++
 2 files changed, 29 insertions(+)

diff --git a/include/linux/string.h b/include/linux/string.h
index d593de2635ba..38acc436dba2 100644
--- a/include/linux/string.h
+++ b/include/linux/string.h
@@ -288,6 +288,24 @@ static inline void memcpy_and_pad(void *dest, size_t dest_len,
 	       sizeof(*(obj)) - offsetofend(typeof(*(obj)), member));	\
 })
 
+/**
+ * memset_startat - Set a value starting at a member to the end of a struct
+ *
+ * @obj: Address of target struct instance
+ * @v: Byte value to repeatedly write
+ * @member: struct member to start writing at
+ *
+ * Note that if there is padding between the prior member and the target
+ * member, memset_after() should be used to clear the prior padding.
+ */
+#define memset_startat(obj, v, member)					\
+({									\
+	u8 *__ptr = (u8 *)(obj);					\
+	typeof(v) __val = (v);						\
+	memset(__ptr + offsetof(typeof(*(obj)), member), __val,		\
+	       sizeof(*(obj)) - offsetof(typeof(*(obj)), member));	\
+})
+
 /**
  * str_has_prefix - Test if a string has a given prefix
  * @str: The string to test
diff --git a/lib/test_memcpy.c b/lib/test_memcpy.c
index 3b485de8c885..fb5deaf04418 100644
--- a/lib/test_memcpy.c
+++ b/lib/test_memcpy.c
@@ -222,6 +222,13 @@ static void memset_test(struct kunit *test)
 			  0x72, 0x72, 0x72, 0x72, 0x72, 0x72, 0x72, 0x72,
 			},
 	};
+	struct some_bytes startat = {
+		.data = { 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30,
+			  0x79, 0x79, 0x79, 0x79, 0x79, 0x79, 0x79, 0x79,
+			  0x79, 0x79, 0x79, 0x79, 0x79, 0x79, 0x79, 0x79,
+			  0x79, 0x79, 0x79, 0x79, 0x79, 0x79, 0x79, 0x79,
+			},
+	};
 	struct some_bytes dest = { };
 	int count, value;
 	u8 *ptr;
@@ -258,6 +265,10 @@ static void memset_test(struct kunit *test)
 	memset_after(&dest, 0x72, three);
 	compare("memset_after()", dest, after);
 
+	/* Verify memset_startat() */
+	dest = control;
+	memset_startat(&dest, 0x79, four);
+	compare("memset_startat()", dest, startat);
 #undef TEST_OP
 }
 
-- 
2.30.2