The patch titled
Subject: string.h: move fortified functions definitions in a dedicated header.
has been added to the -mm tree. Its filename is
stringh-move-fortified-functions-definitions-in-a-dedicated-header.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/stringh-move-fortified-functions-definitions-in-a-dedicated-header.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/stringh-move-fortified-functions-definitions-in-a-dedicated-header.patch
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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Francis Laniel <laniel_francis@xxxxxxxxxxxxxxxxxxx>
Subject: string.h: move fortified functions definitions in a dedicated header.
This patch adds fortify-string.h to contain fortified functions
definitions. Thus, the code is more separated and compile time is
approximately 1% faster for people who do not set CONFIG_FORTIFY_SOURCE.
Link: https://lkml.kernel.org/r/20210111092141.22946-1-laniel_francis@xxxxxxxxxxxxxxxxxxx
Link: https://lkml.kernel.org/r/20210111092141.22946-2-laniel_francis@xxxxxxxxxxxxxxxxxxx
Signed-off-by: Francis Laniel <laniel_francis@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/fortify-string.h | 302 +++++++++++++++++++++++++++++++
include/linux/string.h | 282 ----------------------------
2 files changed, 303 insertions(+), 281 deletions(-)
--- /dev/null
+++ a/include/linux/fortify-string.h
@@ -0,0 +1,302 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_FORTIFY_STRING_H_
+#define _LINUX_FORTIFY_STRING_H_
+
+
+#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
+extern void *__underlying_memchr(const void *p, int c, __kernel_size_t size) __RENAME(memchr);
+extern int __underlying_memcmp(const void *p, const void *q, __kernel_size_t size) __RENAME(memcmp);
+extern void *__underlying_memcpy(void *p, const void *q, __kernel_size_t size) __RENAME(memcpy);
+extern void *__underlying_memmove(void *p, const void *q, __kernel_size_t size) __RENAME(memmove);
+extern void *__underlying_memset(void *p, int c, __kernel_size_t size) __RENAME(memset);
+extern char *__underlying_strcat(char *p, const char *q) __RENAME(strcat);
+extern char *__underlying_strcpy(char *p, const char *q) __RENAME(strcpy);
+extern __kernel_size_t __underlying_strlen(const char *p) __RENAME(strlen);
+extern char *__underlying_strncat(char *p, const char *q, __kernel_size_t count) __RENAME(strncat);
+extern char *__underlying_strncpy(char *p, const char *q, __kernel_size_t size) __RENAME(strncpy);
+#else
+#define __underlying_memchr __builtin_memchr
+#define __underlying_memcmp __builtin_memcmp
+#define __underlying_memcpy __builtin_memcpy
+#define __underlying_memmove __builtin_memmove
+#define __underlying_memset __builtin_memset
+#define __underlying_strcat __builtin_strcat
+#define __underlying_strcpy __builtin_strcpy
+#define __underlying_strlen __builtin_strlen
+#define __underlying_strncat __builtin_strncat
+#define __underlying_strncpy __builtin_strncpy
+#endif
+
+__FORTIFY_INLINE char *strncpy(char *p, const char *q, __kernel_size_t size)
+{
+ size_t p_size = __builtin_object_size(p, 1);
+
+ if (__builtin_constant_p(size) && p_size < size)
+ __write_overflow();
+ if (p_size < size)
+ fortify_panic(__func__);
+ return __underlying_strncpy(p, q, size);
+}
+
+__FORTIFY_INLINE char *strcat(char *p, const char *q)
+{
+ size_t p_size = __builtin_object_size(p, 1);
+
+ if (p_size == (size_t)-1)
+ return __underlying_strcat(p, q);
+ if (strlcat(p, q, p_size) >= p_size)
+ fortify_panic(__func__);
+ return p;
+}
+
+__FORTIFY_INLINE __kernel_size_t strlen(const char *p)
+{
+ __kernel_size_t ret;
+ size_t p_size = __builtin_object_size(p, 1);
+
+ /* Work around gcc excess stack consumption issue */
+ if (p_size == (size_t)-1 ||
+ (__builtin_constant_p(p[p_size - 1]) && p[p_size - 1] == '\0'))
+ return __underlying_strlen(p);
+ ret = strnlen(p, p_size);
+ if (p_size <= ret)
+ fortify_panic(__func__);
+ return ret;
+}
+
+extern __kernel_size_t __real_strnlen(const char *, __kernel_size_t) __RENAME(strnlen);
+__FORTIFY_INLINE __kernel_size_t strnlen(const char *p, __kernel_size_t maxlen)
+{
+ size_t p_size = __builtin_object_size(p, 1);
+ __kernel_size_t ret = __real_strnlen(p, maxlen < p_size ? maxlen : p_size);
+
+ if (p_size <= ret && maxlen != ret)
+ fortify_panic(__func__);
+ return ret;
+}
+
+/* defined after fortified strlen to reuse it */
+extern size_t __real_strlcpy(char *, const char *, size_t) __RENAME(strlcpy);
+__FORTIFY_INLINE size_t strlcpy(char *p, const char *q, size_t size)
+{
+ size_t ret;
+ size_t p_size = __builtin_object_size(p, 1);
+ size_t q_size = __builtin_object_size(q, 1);
+
+ if (p_size == (size_t)-1 && q_size == (size_t)-1)
+ return __real_strlcpy(p, q, size);
+ ret = strlen(q);
+ if (size) {
+ size_t len = (ret >= size) ? size - 1 : ret;
+
+ if (__builtin_constant_p(len) && len >= p_size)
+ __write_overflow();
+ if (len >= p_size)
+ fortify_panic(__func__);
+ __underlying_memcpy(p, q, len);
+ p[len] = '\0';
+ }
+ return ret;
+}
+
+/* defined after fortified strnlen to reuse it */
+extern ssize_t __real_strscpy(char *, const char *, size_t) __RENAME(strscpy);
+__FORTIFY_INLINE ssize_t strscpy(char *p, const char *q, size_t size)
+{
+ size_t len;
+ /* Use string size rather than possible enclosing struct size. */
+ size_t p_size = __builtin_object_size(p, 1);
+ size_t q_size = __builtin_object_size(q, 1);
+
+ /* If we cannot get size of p and q default to call strscpy. */
+ if (p_size == (size_t) -1 && q_size == (size_t) -1)
+ return __real_strscpy(p, q, size);
+
+ /*
+ * If size can be known at compile time and is greater than
+ * p_size, generate a compile time write overflow error.
+ */
+ if (__builtin_constant_p(size) && size > p_size)
+ __write_overflow();
+
+ /*
+ * This call protects from read overflow, because len will default to q
+ * length if it smaller than size.
+ */
+ len = strnlen(q, size);
+ /*
+ * If len equals size, we will copy only size bytes which leads to
+ * -E2BIG being returned.
+ * Otherwise we will copy len + 1 because of the final '\O'.
+ */
+ len = len == size ? size : len + 1;
+
+ /*
+ * Generate a runtime write overflow error if len is greater than
+ * p_size.
+ */
+ if (len > p_size)
+ fortify_panic(__func__);
+
+ /*
+ * We can now safely call vanilla strscpy because we are protected from:
+ * 1. Read overflow thanks to call to strnlen().
+ * 2. Write overflow thanks to above ifs.
+ */
+ return __real_strscpy(p, q, len);
+}
+
+/* defined after fortified strlen and strnlen to reuse them */
+__FORTIFY_INLINE char *strncat(char *p, const char *q, __kernel_size_t count)
+{
+ size_t p_len, copy_len;
+ size_t p_size = __builtin_object_size(p, 1);
+ size_t q_size = __builtin_object_size(q, 1);
+
+ if (p_size == (size_t)-1 && q_size == (size_t)-1)
+ return __underlying_strncat(p, q, count);
+ p_len = strlen(p);
+ copy_len = strnlen(q, count);
+ if (p_size < p_len + copy_len + 1)
+ fortify_panic(__func__);
+ __underlying_memcpy(p + p_len, q, copy_len);
+ p[p_len + copy_len] = '\0';
+ return p;
+}
+
+__FORTIFY_INLINE void *memset(void *p, int c, __kernel_size_t size)
+{
+ size_t p_size = __builtin_object_size(p, 0);
+
+ if (__builtin_constant_p(size) && p_size < size)
+ __write_overflow();
+ if (p_size < size)
+ fortify_panic(__func__);
+ return __underlying_memset(p, c, size);
+}
+
+__FORTIFY_INLINE void *memcpy(void *p, const void *q, __kernel_size_t size)
+{
+ size_t p_size = __builtin_object_size(p, 0);
+ size_t q_size = __builtin_object_size(q, 0);
+
+ if (__builtin_constant_p(size)) {
+ if (p_size < size)
+ __write_overflow();
+ if (q_size < size)
+ __read_overflow2();
+ }
+ if (p_size < size || q_size < size)
+ fortify_panic(__func__);
+ return __underlying_memcpy(p, q, size);
+}
+
+__FORTIFY_INLINE void *memmove(void *p, const void *q, __kernel_size_t size)
+{
+ size_t p_size = __builtin_object_size(p, 0);
+ size_t q_size = __builtin_object_size(q, 0);
+
+ if (__builtin_constant_p(size)) {
+ if (p_size < size)
+ __write_overflow();
+ if (q_size < size)
+ __read_overflow2();
+ }
+ if (p_size < size || q_size < size)
+ fortify_panic(__func__);
+ return __underlying_memmove(p, q, size);
+}
+
+extern void *__real_memscan(void *, int, __kernel_size_t) __RENAME(memscan);
+__FORTIFY_INLINE void *memscan(void *p, int c, __kernel_size_t size)
+{
+ size_t p_size = __builtin_object_size(p, 0);
+
+ if (__builtin_constant_p(size) && p_size < size)
+ __read_overflow();
+ if (p_size < size)
+ fortify_panic(__func__);
+ return __real_memscan(p, c, size);
+}
+
+__FORTIFY_INLINE int memcmp(const void *p, const void *q, __kernel_size_t size)
+{
+ size_t p_size = __builtin_object_size(p, 0);
+ size_t q_size = __builtin_object_size(q, 0);
+
+ if (__builtin_constant_p(size)) {
+ if (p_size < size)
+ __read_overflow();
+ if (q_size < size)
+ __read_overflow2();
+ }
+ if (p_size < size || q_size < size)
+ fortify_panic(__func__);
+ return __underlying_memcmp(p, q, size);
+}
+
+__FORTIFY_INLINE void *memchr(const void *p, int c, __kernel_size_t size)
+{
+ size_t p_size = __builtin_object_size(p, 0);
+
+ if (__builtin_constant_p(size) && p_size < size)
+ __read_overflow();
+ if (p_size < size)
+ fortify_panic(__func__);
+ return __underlying_memchr(p, c, size);
+}
+
+void *__real_memchr_inv(const void *s, int c, size_t n) __RENAME(memchr_inv);
+__FORTIFY_INLINE void *memchr_inv(const void *p, int c, size_t size)
+{
+ size_t p_size = __builtin_object_size(p, 0);
+
+ if (__builtin_constant_p(size) && p_size < size)
+ __read_overflow();
+ if (p_size < size)
+ fortify_panic(__func__);
+ return __real_memchr_inv(p, c, size);
+}
+
+extern void *__real_kmemdup(const void *src, size_t len, gfp_t gfp) __RENAME(kmemdup);
+__FORTIFY_INLINE void *kmemdup(const void *p, size_t size, gfp_t gfp)
+{
+ size_t p_size = __builtin_object_size(p, 0);
+
+ if (__builtin_constant_p(size) && p_size < size)
+ __read_overflow();
+ if (p_size < size)
+ fortify_panic(__func__);
+ return __real_kmemdup(p, size, gfp);
+}
+
+/* defined after fortified strlen and memcpy to reuse them */
+__FORTIFY_INLINE char *strcpy(char *p, const char *q)
+{
+ size_t p_size = __builtin_object_size(p, 1);
+ size_t q_size = __builtin_object_size(q, 1);
+ size_t size;
+
+ if (p_size == (size_t)-1 && q_size == (size_t)-1)
+ return __underlying_strcpy(p, q);
+ size = strlen(q) + 1;
+ /* test here to use the more stringent object size */
+ if (p_size < size)
+ fortify_panic(__func__);
+ memcpy(p, q, size);
+ return p;
+}
+
+/* Don't use these outside the FORITFY_SOURCE implementation */
+#undef __underlying_memchr
+#undef __underlying_memcmp
+#undef __underlying_memcpy
+#undef __underlying_memmove
+#undef __underlying_memset
+#undef __underlying_strcat
+#undef __underlying_strcpy
+#undef __underlying_strlen
+#undef __underlying_strncat
+#undef __underlying_strncpy
+
+#endif /* _LINUX_FORTIFY_STRING_H_ */
--- a/include/linux/string.h~stringh-move-fortified-functions-definitions-in-a-dedicated-header
+++ a/include/linux/string.h
@@ -266,287 +266,7 @@ void __read_overflow3(void) __compiletim
void __write_overflow(void) __compiletime_error("detected write beyond size of object passed as 1st parameter");
#if !defined(__NO_FORTIFY) && defined(__OPTIMIZE__) && defined(CONFIG_FORTIFY_SOURCE)
-
-#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
-extern void *__underlying_memchr(const void *p, int c, __kernel_size_t size) __RENAME(memchr);
-extern int __underlying_memcmp(const void *p, const void *q, __kernel_size_t size) __RENAME(memcmp);
-extern void *__underlying_memcpy(void *p, const void *q, __kernel_size_t size) __RENAME(memcpy);
-extern void *__underlying_memmove(void *p, const void *q, __kernel_size_t size) __RENAME(memmove);
-extern void *__underlying_memset(void *p, int c, __kernel_size_t size) __RENAME(memset);
-extern char *__underlying_strcat(char *p, const char *q) __RENAME(strcat);
-extern char *__underlying_strcpy(char *p, const char *q) __RENAME(strcpy);
-extern __kernel_size_t __underlying_strlen(const char *p) __RENAME(strlen);
-extern char *__underlying_strncat(char *p, const char *q, __kernel_size_t count) __RENAME(strncat);
-extern char *__underlying_strncpy(char *p, const char *q, __kernel_size_t size) __RENAME(strncpy);
-#else
-#define __underlying_memchr __builtin_memchr
-#define __underlying_memcmp __builtin_memcmp
-#define __underlying_memcpy __builtin_memcpy
-#define __underlying_memmove __builtin_memmove
-#define __underlying_memset __builtin_memset
-#define __underlying_strcat __builtin_strcat
-#define __underlying_strcpy __builtin_strcpy
-#define __underlying_strlen __builtin_strlen
-#define __underlying_strncat __builtin_strncat
-#define __underlying_strncpy __builtin_strncpy
-#endif
-
-__FORTIFY_INLINE char *strncpy(char *p, const char *q, __kernel_size_t size)
-{
- size_t p_size = __builtin_object_size(p, 1);
- if (__builtin_constant_p(size) && p_size < size)
- __write_overflow();
- if (p_size < size)
- fortify_panic(__func__);
- return __underlying_strncpy(p, q, size);
-}
-
-__FORTIFY_INLINE char *strcat(char *p, const char *q)
-{
- size_t p_size = __builtin_object_size(p, 1);
- if (p_size == (size_t)-1)
- return __underlying_strcat(p, q);
- if (strlcat(p, q, p_size) >= p_size)
- fortify_panic(__func__);
- return p;
-}
-
-__FORTIFY_INLINE __kernel_size_t strlen(const char *p)
-{
- __kernel_size_t ret;
- size_t p_size = __builtin_object_size(p, 1);
-
- /* Work around gcc excess stack consumption issue */
- if (p_size == (size_t)-1 ||
- (__builtin_constant_p(p[p_size - 1]) && p[p_size - 1] == '\0'))
- return __underlying_strlen(p);
- ret = strnlen(p, p_size);
- if (p_size <= ret)
- fortify_panic(__func__);
- return ret;
-}
-
-extern __kernel_size_t __real_strnlen(const char *, __kernel_size_t) __RENAME(strnlen);
-__FORTIFY_INLINE __kernel_size_t strnlen(const char *p, __kernel_size_t maxlen)
-{
- size_t p_size = __builtin_object_size(p, 1);
- __kernel_size_t ret = __real_strnlen(p, maxlen < p_size ? maxlen : p_size);
- if (p_size <= ret && maxlen != ret)
- fortify_panic(__func__);
- return ret;
-}
-
-/* defined after fortified strlen to reuse it */
-extern size_t __real_strlcpy(char *, const char *, size_t) __RENAME(strlcpy);
-__FORTIFY_INLINE size_t strlcpy(char *p, const char *q, size_t size)
-{
- size_t ret;
- size_t p_size = __builtin_object_size(p, 1);
- size_t q_size = __builtin_object_size(q, 1);
- if (p_size == (size_t)-1 && q_size == (size_t)-1)
- return __real_strlcpy(p, q, size);
- ret = strlen(q);
- if (size) {
- size_t len = (ret >= size) ? size - 1 : ret;
- if (__builtin_constant_p(len) && len >= p_size)
- __write_overflow();
- if (len >= p_size)
- fortify_panic(__func__);
- __underlying_memcpy(p, q, len);
- p[len] = '\0';
- }
- return ret;
-}
-
-/* defined after fortified strnlen to reuse it */
-extern ssize_t __real_strscpy(char *, const char *, size_t) __RENAME(strscpy);
-__FORTIFY_INLINE ssize_t strscpy(char *p, const char *q, size_t size)
-{
- size_t len;
- /* Use string size rather than possible enclosing struct size. */
- size_t p_size = __builtin_object_size(p, 1);
- size_t q_size = __builtin_object_size(q, 1);
-
- /* If we cannot get size of p and q default to call strscpy. */
- if (p_size == (size_t) -1 && q_size == (size_t) -1)
- return __real_strscpy(p, q, size);
-
- /*
- * If size can be known at compile time and is greater than
- * p_size, generate a compile time write overflow error.
- */
- if (__builtin_constant_p(size) && size > p_size)
- __write_overflow();
-
- /*
- * This call protects from read overflow, because len will default to q
- * length if it smaller than size.
- */
- len = strnlen(q, size);
- /*
- * If len equals size, we will copy only size bytes which leads to
- * -E2BIG being returned.
- * Otherwise we will copy len + 1 because of the final '\O'.
- */
- len = len == size ? size : len + 1;
-
- /*
- * Generate a runtime write overflow error if len is greater than
- * p_size.
- */
- if (len > p_size)
- fortify_panic(__func__);
-
- /*
- * We can now safely call vanilla strscpy because we are protected from:
- * 1. Read overflow thanks to call to strnlen().
- * 2. Write overflow thanks to above ifs.
- */
- return __real_strscpy(p, q, len);
-}
-
-/* defined after fortified strlen and strnlen to reuse them */
-__FORTIFY_INLINE char *strncat(char *p, const char *q, __kernel_size_t count)
-{
- size_t p_len, copy_len;
- size_t p_size = __builtin_object_size(p, 1);
- size_t q_size = __builtin_object_size(q, 1);
- if (p_size == (size_t)-1 && q_size == (size_t)-1)
- return __underlying_strncat(p, q, count);
- p_len = strlen(p);
- copy_len = strnlen(q, count);
- if (p_size < p_len + copy_len + 1)
- fortify_panic(__func__);
- __underlying_memcpy(p + p_len, q, copy_len);
- p[p_len + copy_len] = '\0';
- return p;
-}
-
-__FORTIFY_INLINE void *memset(void *p, int c, __kernel_size_t size)
-{
- size_t p_size = __builtin_object_size(p, 0);
- if (__builtin_constant_p(size) && p_size < size)
- __write_overflow();
- if (p_size < size)
- fortify_panic(__func__);
- return __underlying_memset(p, c, size);
-}
-
-__FORTIFY_INLINE void *memcpy(void *p, const void *q, __kernel_size_t size)
-{
- size_t p_size = __builtin_object_size(p, 0);
- size_t q_size = __builtin_object_size(q, 0);
- if (__builtin_constant_p(size)) {
- if (p_size < size)
- __write_overflow();
- if (q_size < size)
- __read_overflow2();
- }
- if (p_size < size || q_size < size)
- fortify_panic(__func__);
- return __underlying_memcpy(p, q, size);
-}
-
-__FORTIFY_INLINE void *memmove(void *p, const void *q, __kernel_size_t size)
-{
- size_t p_size = __builtin_object_size(p, 0);
- size_t q_size = __builtin_object_size(q, 0);
- if (__builtin_constant_p(size)) {
- if (p_size < size)
- __write_overflow();
- if (q_size < size)
- __read_overflow2();
- }
- if (p_size < size || q_size < size)
- fortify_panic(__func__);
- return __underlying_memmove(p, q, size);
-}
-
-extern void *__real_memscan(void *, int, __kernel_size_t) __RENAME(memscan);
-__FORTIFY_INLINE void *memscan(void *p, int c, __kernel_size_t size)
-{
- size_t p_size = __builtin_object_size(p, 0);
- if (__builtin_constant_p(size) && p_size < size)
- __read_overflow();
- if (p_size < size)
- fortify_panic(__func__);
- return __real_memscan(p, c, size);
-}
-
-__FORTIFY_INLINE int memcmp(const void *p, const void *q, __kernel_size_t size)
-{
- size_t p_size = __builtin_object_size(p, 0);
- size_t q_size = __builtin_object_size(q, 0);
- if (__builtin_constant_p(size)) {
- if (p_size < size)
- __read_overflow();
- if (q_size < size)
- __read_overflow2();
- }
- if (p_size < size || q_size < size)
- fortify_panic(__func__);
- return __underlying_memcmp(p, q, size);
-}
-
-__FORTIFY_INLINE void *memchr(const void *p, int c, __kernel_size_t size)
-{
- size_t p_size = __builtin_object_size(p, 0);
- if (__builtin_constant_p(size) && p_size < size)
- __read_overflow();
- if (p_size < size)
- fortify_panic(__func__);
- return __underlying_memchr(p, c, size);
-}
-
-void *__real_memchr_inv(const void *s, int c, size_t n) __RENAME(memchr_inv);
-__FORTIFY_INLINE void *memchr_inv(const void *p, int c, size_t size)
-{
- size_t p_size = __builtin_object_size(p, 0);
- if (__builtin_constant_p(size) && p_size < size)
- __read_overflow();
- if (p_size < size)
- fortify_panic(__func__);
- return __real_memchr_inv(p, c, size);
-}
-
-extern void *__real_kmemdup(const void *src, size_t len, gfp_t gfp) __RENAME(kmemdup);
-__FORTIFY_INLINE void *kmemdup(const void *p, size_t size, gfp_t gfp)
-{
- size_t p_size = __builtin_object_size(p, 0);
- if (__builtin_constant_p(size) && p_size < size)
- __read_overflow();
- if (p_size < size)
- fortify_panic(__func__);
- return __real_kmemdup(p, size, gfp);
-}
-
-/* defined after fortified strlen and memcpy to reuse them */
-__FORTIFY_INLINE char *strcpy(char *p, const char *q)
-{
- size_t p_size = __builtin_object_size(p, 1);
- size_t q_size = __builtin_object_size(q, 1);
- size_t size;
- if (p_size == (size_t)-1 && q_size == (size_t)-1)
- return __underlying_strcpy(p, q);
- size = strlen(q) + 1;
- /* test here to use the more stringent object size */
- if (p_size < size)
- fortify_panic(__func__);
- memcpy(p, q, size);
- return p;
-}
-
-/* Don't use these outside the FORITFY_SOURCE implementation */
-#undef __underlying_memchr
-#undef __underlying_memcmp
-#undef __underlying_memcpy
-#undef __underlying_memmove
-#undef __underlying_memset
-#undef __underlying_strcat
-#undef __underlying_strcpy
-#undef __underlying_strlen
-#undef __underlying_strncat
-#undef __underlying_strncpy
+#include <linux/fortify-string.h>
#endif
/**
_
Patches currently in -mm which might be from laniel_francis@xxxxxxxxxxxxxxxxxxx are
stringh-move-fortified-functions-definitions-in-a-dedicated-header.patch
