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compiler.h: Introduce __must_be_byte_array()

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In preparation for adding stricter type checking to the str/mem*()
helpers, provide a way to check that a variable is a byte array
via __must_be_byte_array().

Suggested-by: Kent Overstreet <kent.overstreet@linux.dev>
Signed-off-by: Kees Cook <kees@kernel.org>
This commit is contained in:
Kees Cook
2025-02-05 12:48:07 -08:00
parent cb7380de9e
commit 20e5cc26e5
1 changed files with 7 additions and 1 deletions
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8
include/linux/compiler.h
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@@ -221,7 +221,13 @@ void ftrace_likely_update(struct ftrace_likely_data *f, int val,
#endif /* __CHECKER__ */
/* &a[0] degrades to a pointer: a different type from an array */
#define __must_be_array(a) __BUILD_BUG_ON_ZERO_MSG(__same_type((a), &(a)[0]), "must be array")
#define __is_array(a) (!__same_type((a), &(a)[0]))
#define __must_be_array(a) __BUILD_BUG_ON_ZERO_MSG(!__is_array(a), \
"must be array")
#define __is_byte_array(a) (__is_array(a) && sizeof((a)[0]) == 1)
#define __must_be_byte_array(a) __BUILD_BUG_ON_ZERO_MSG(!__is_byte_array(a), \
"must be byte array")
/* Require C Strings (i.e. NUL-terminated) lack the "nonstring" attribute. */
#define __must_be_cstr(p) \