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Declare mbedtls_debug_print_msg as printf-like

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We were not getting any warnings on printf format errors, as we do not
explicitly use printf anywhere in the code. Thankfully there is a way
to mark a function as having printf behaviour so that its inputs can be
checked in the same way as printf would be.

Signed-off-by: Paul Elliott <paul.elliott@arm.com>
This commit is contained in:
Paul Elliott 2020-12-09 14:38:01 +00:00
parent ea32d55623
commit 4e589701d8
2 changed files with 21 additions and 1 deletions
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21
include/mbedtls/debug.h
View file

@ -80,6 +80,25 @@
#endif /* MBEDTLS_DEBUG_C */
/**
* \def MBEDTLS_PRINTF_ATTRIBUTE
*
* Mark a function as having printf attributes, and thus enable checking
* via -wFormat and other flags. This does nothing in windows builds as the
* windows compiler does not support it.
*
* Module: library/debug.c
* Caller:
*
* This module provides debugging functions.
*/
#if (defined(_WIN32) || defined(_WIN64))
#define MBEDTLS_PRINTF_ATTRIBUTE(string_index, first_to_check)
#else
#define MBEDTLS_PRINTF_ATTRIBUTE(string_index, first_to_check) \
__attribute__((format (printf, string_index, first_to_check)))
#endif
#ifdef __cplusplus
extern "C" {
#endif
@ -118,7 +137,7 @@ void mbedtls_debug_set_threshold( int threshold );
*/
void mbedtls_debug_print_msg( const mbedtls_ssl_context *ssl, int level,
const char *file, int line,
const char *format, ... );
const char *format, ... ) MBEDTLS_PRINTF_ATTRIBUTE(5, 6);
/**
* \brief Print the return value of a function to the debug output. This

1
library/debug.c
View file

@ -74,6 +74,7 @@ static inline void debug_send_line( const mbedtls_ssl_context *ssl, int level,
#endif
}
MBEDTLS_PRINTF_ATTRIBUTE(5, 6)
void mbedtls_debug_print_msg( const mbedtls_ssl_context *ssl, int level,
const char *file, int line,
const char *format, ... )