add boot partition size

hc

2023-12-11 d2ccde1c8e90d38cee87a1b0309ad2827f3fd30d

 kernel/include/linux/string.h
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@@ -62,6 +62,7 @@
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 #ifndef __HAVE_ARCH_STRCHRNUL
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 extern char * strchrnul(const char *,int);
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 #endif
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+extern char * strnchrnul(const char *, size_t, int);
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 #ifndef __HAVE_ARCH_STRNCHR
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 extern char * strnchr(const char *, size_t, int);
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 #endif
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@@ -135,6 +136,13 @@
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 		return memset64((uint64_t *)p, (uintptr_t)v, n);
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 }
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+extern void **__memcat_p(void **a, void **b);
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+#define memcat_p(a, b) ({					\
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+	BUILD_BUG_ON_MSG(!__same_type(*(a), *(b)),		\
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+			 "type mismatch in memcat_p()");	\
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+	(typeof(*a) *)__memcat_p((void **)(a), (void **)(b));	\
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+})
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+
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 #ifndef __HAVE_ARCH_MEMCPY
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 extern void * memcpy(void *,const void *,__kernel_size_t);
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 #endif
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@@ -153,20 +161,13 @@
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 #ifndef __HAVE_ARCH_MEMCHR
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 extern void * memchr(const void *,int,__kernel_size_t);
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 #endif
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-#ifndef __HAVE_ARCH_MEMCPY_MCSAFE
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-static inline __must_check unsigned long memcpy_mcsafe(void *dst,
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-		const void *src, size_t cnt)
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-{
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-	memcpy(dst, src, cnt);
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-	return 0;
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-}
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-#endif
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 #ifndef __HAVE_ARCH_MEMCPY_FLUSHCACHE
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 static inline void memcpy_flushcache(void *dst, const void *src, size_t cnt)
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 {
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 	memcpy(dst, src, cnt);
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 }
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 #endif
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+
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 void *memchr_inv(const void *s, int c, size_t n);
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 char *strreplace(char *s, char old, char new);
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@@ -222,7 +223,26 @@
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 }
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 size_t memweight(const void *ptr, size_t bytes);
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-void memzero_explicit(void *s, size_t count);
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+
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+/**
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+ * memzero_explicit - Fill a region of memory (e.g. sensitive
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+ *		      keying data) with 0s.
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+ * @s: Pointer to the start of the area.
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+ * @count: The size of the area.
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+ *
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+ * Note: usually using memset() is just fine (!), but in cases
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+ * where clearing out _local_ data at the end of a scope is
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+ * necessary, memzero_explicit() should be used instead in
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+ * order to prevent the compiler from optimising away zeroing.
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+ *
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+ * memzero_explicit() doesn't need an arch-specific version as
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+ * it just invokes the one of memset() implicitly.
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+ */
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+static inline void memzero_explicit(void *s, size_t count)
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+{
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+	memset(s, 0, count);
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+	barrier_data(s);
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+}
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 /**
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  * kbasename - return the last part of a pathname.
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@@ -246,7 +266,7 @@
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 #if !defined(__NO_FORTIFY) && defined(__OPTIMIZE__) && defined(CONFIG_FORTIFY_SOURCE)
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-#ifdef CONFIG_KASAN
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+#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
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 extern void *__underlying_memchr(const void *p, int c, __kernel_size_t size) __RENAME(memchr);
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 extern int __underlying_memcmp(const void *p, const void *q, __kernel_size_t size) __RENAME(memcmp);
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 extern void *__underlying_memcpy(void *p, const void *q, __kernel_size_t size) __RENAME(memcpy);
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@@ -494,4 +514,25 @@
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 		memcpy(dest, src, dest_len);
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 }
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+/**
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+ * str_has_prefix - Test if a string has a given prefix
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+ * @str: The string to test
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+ * @prefix: The string to see if @str starts with
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+ *
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+ * A common way to test a prefix of a string is to do:
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+ *  strncmp(str, prefix, sizeof(prefix) - 1)
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+ *
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+ * But this can lead to bugs due to typos, or if prefix is a pointer
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+ * and not a constant. Instead use str_has_prefix().
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+ *
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+ * Returns:
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+ * * strlen(@prefix) if @str starts with @prefix
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+ * * 0 if @str does not start with @prefix
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+ */
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+static __always_inline size_t str_has_prefix(const char *str, const char *prefix)
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+{
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+	size_t len = strlen(prefix);
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+	return strncmp(str, prefix, len) == 0 ? len : 0;
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+}
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+
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 #endif /* _LINUX_STRING_H_ */