diff options
| -rw-r--r-- | toolchain/musl/patches/040-Add-format-attribute-to-some-function-declarations.patch | 209 |
1 files changed, 209 insertions, 0 deletions
diff --git a/toolchain/musl/patches/040-Add-format-attribute-to-some-function-declarations.patch b/toolchain/musl/patches/040-Add-format-attribute-to-some-function-declarations.patch new file mode 100644 index 0000000..1d61d92 --- /dev/null +++ b/toolchain/musl/patches/040-Add-format-attribute-to-some-function-declarations.patch @@ -0,0 +1,209 @@ +From e6683d001a95d7c3d4d992496f00f77e01fcd268 Mon Sep 17 00:00:00 2001 +From: Hauke Mehrtens <hauke@hauke-m.de> +Date: Sun, 22 Nov 2015 15:04:23 +0100 +Subject: [PATCH v2] Add format attribute to some function declarations + +GCC and Clang are able to check the format arguments given to a +function and warn the user if there is a error in the format arguments +or if there is a potential uncontrolled format string security problem +in the code. GCC does this automatically for some functions like +printf(), but it is also possible to annotate other functions in a way +that it will check them too. This feature is used by glibc for many +functions. This patch adds the attribute to the some functions of musl +expect for these functions where gcc automatically adds it. + +GCC automatically adds checks for these functions: printf, fprintf, +sprintf, scanf, fscanf, sscanf, strftime, vprintf, vfprintf and +vsprintf. + +The documentation from gcc is here: +https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html + +The documentation from Clang is here: +http://clang.llvm.org/docs/AttributeReference.html#format-gnu-format + +Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de> +--- + include/err.h | 26 +++++++++++++++++--------- + include/monetary.h | 12 ++++++++++-- + include/stdio.h | 29 ++++++++++++++++++++--------- + include/syslog.h | 12 ++++++++++-- + 4 files changed, 57 insertions(+), 22 deletions(-) + +diff --git a/include/err.h b/include/err.h +index 9f5cb6b..a5e3cde 100644 +--- a/include/err.h ++++ b/include/err.h +@@ -8,15 +8,23 @@ + extern "C" { + #endif + +-void warn(const char *, ...); +-void vwarn(const char *, va_list); +-void warnx(const char *, ...); +-void vwarnx(const char *, va_list); +- +-_Noreturn void err(int, const char *, ...); +-_Noreturn void verr(int, const char *, va_list); +-_Noreturn void errx(int, const char *, ...); +-_Noreturn void verrx(int, const char *, va_list); ++#if __GNUC__ >= 3 ++#define __fp(x, y) __attribute__ ((__format__ (__printf__, x, y))) ++#else ++#define __fp(x, y) ++#endif ++ ++void warn(const char *, ...) __fp(1, 2); ++void vwarn(const char *, va_list) __fp(1, 0); ++void warnx(const char *, ...) __fp(1, 2); ++void vwarnx(const char *, va_list) __fp(1, 0); ++ ++_Noreturn void err(int, const char *, ...) __fp(2, 3); ++_Noreturn void verr(int, const char *, va_list) __fp(2, 0); ++_Noreturn void errx(int, const char *, ...) __fp(2, 3); ++_Noreturn void verrx(int, const char *, va_list) __fp(2, 0); ++ ++#undef __fp + + #ifdef __cplusplus + } +diff --git a/include/monetary.h b/include/monetary.h +index a91fa56..85c4d23 100644 +--- a/include/monetary.h ++++ b/include/monetary.h +@@ -13,8 +13,16 @@ extern "C" { + + #include <bits/alltypes.h> + +-ssize_t strfmon(char *__restrict, size_t, const char *__restrict, ...); +-ssize_t strfmon_l(char *__restrict, size_t, locale_t, const char *__restrict, ...); ++#if __GNUC__ >= 3 ++#define __fsfm(x, y) __attribute__ ((__format__ (__strfmon__, x, y))) ++#else ++#define __fsfm(x, y) ++#endif ++ ++ssize_t strfmon(char *__restrict, size_t, const char *__restrict, ...) __fsfm(3, 4); ++ssize_t strfmon_l(char *__restrict, size_t, locale_t, const char *__restrict, ...) __fsfm(4, 5); ++ ++#undef __fsfm + + #ifdef __cplusplus + } +diff --git a/include/stdio.h b/include/stdio.h +index 884d2e6..17ca68e 100644 +--- a/include/stdio.h ++++ b/include/stdio.h +@@ -21,6 +21,14 @@ extern "C" { + + #include <bits/alltypes.h> + ++#if __GNUC__ >= 3 ++#define __fp(x, y) __attribute__ ((__format__ (__printf__, x, y))) ++#define __fs(x, y) __attribute__ ((__format__ (__scanf__, x, y))) ++#else ++#define __fp(x, y) ++#define __fs(x, y) ++#endif ++ + #ifdef __cplusplus + #define NULL 0L + #else +@@ -102,19 +110,19 @@ int puts(const char *); + int printf(const char *__restrict, ...); + int fprintf(FILE *__restrict, const char *__restrict, ...); + int sprintf(char *__restrict, const char *__restrict, ...); +-int snprintf(char *__restrict, size_t, const char *__restrict, ...); ++int snprintf(char *__restrict, size_t, const char *__restrict, ...) __fp(3, 4); + + int vprintf(const char *__restrict, __isoc_va_list); + int vfprintf(FILE *__restrict, const char *__restrict, __isoc_va_list); + int vsprintf(char *__restrict, const char *__restrict, __isoc_va_list); +-int vsnprintf(char *__restrict, size_t, const char *__restrict, __isoc_va_list); ++int vsnprintf(char *__restrict, size_t, const char *__restrict, __isoc_va_list) __fp(3, 0); + + int scanf(const char *__restrict, ...); + int fscanf(FILE *__restrict, const char *__restrict, ...); + int sscanf(const char *__restrict, const char *__restrict, ...); +-int vscanf(const char *__restrict, __isoc_va_list); +-int vfscanf(FILE *__restrict, const char *__restrict, __isoc_va_list); +-int vsscanf(const char *__restrict, const char *__restrict, __isoc_va_list); ++int vscanf(const char *__restrict, __isoc_va_list) __fs(1, 0); ++int vfscanf(FILE *__restrict, const char *__restrict, __isoc_va_list) __fs(2, 0); ++int vsscanf(const char *__restrict, const char *__restrict, __isoc_va_list) __fs(2, 0); + + void perror(const char *); + +@@ -135,8 +143,8 @@ int pclose(FILE *); + int fileno(FILE *); + int fseeko(FILE *, off_t, int); + off_t ftello(FILE *); +-int dprintf(int, const char *__restrict, ...); +-int vdprintf(int, const char *__restrict, __isoc_va_list); ++int dprintf(int, const char *__restrict, ...) __fp(2, 3); ++int vdprintf(int, const char *__restrict, __isoc_va_list) __fp(2, 0); + void flockfile(FILE *); + int ftrylockfile(FILE *); + void funlockfile(FILE *); +@@ -175,8 +183,8 @@ int fileno_unlocked(FILE *); + int getw(FILE *); + int putw(int, FILE *); + char *fgetln(FILE *, size_t *); +-int asprintf(char **, const char *, ...); +-int vasprintf(char **, const char *, __isoc_va_list); ++int asprintf(char **, const char *, ...) __fp(2, 3); ++int vasprintf(char **, const char *, __isoc_va_list) __fp(2, 0); + #endif + + #ifdef _GNU_SOURCE +@@ -184,6 +192,9 @@ char *fgets_unlocked(char *, int, FILE *); + int fputs_unlocked(const char *, FILE *); + #endif + ++#undef __fp ++#undef __fs ++ + #if defined(_LARGEFILE64_SOURCE) || defined(_GNU_SOURCE) + #define tmpfile64 tmpfile + #define fopen64 fopen +diff --git a/include/syslog.h b/include/syslog.h +index 5b4d296..33b549d 100644 +--- a/include/syslog.h ++++ b/include/syslog.h +@@ -56,16 +56,22 @@ extern "C" { + #define LOG_NOWAIT 0x10 + #define LOG_PERROR 0x20 + ++#if __GNUC__ >= 3 ++#define __fp(x, y) __attribute__ ((__format__ (__printf__, x, y))) ++#else ++#define __fp(x, y) ++#endif ++ + void closelog (void); + void openlog (const char *, int, int); + int setlogmask (int); +-void syslog (int, const char *, ...); ++void syslog (int, const char *, ...) __fp(2, 3); + + #if defined(_GNU_SOURCE) || defined(_BSD_SOURCE) + #define _PATH_LOG "/dev/log" + #define __NEED_va_list + #include <bits/alltypes.h> +-void vsyslog (int, const char *, va_list); ++void vsyslog (int, const char *, va_list) __fp(2, 0); + #if defined(SYSLOG_NAMES) + #define INTERNAL_NOPRI 0x10 + #define INTERNAL_MARK (LOG_NFACILITIES<<3) +@@ -93,6 +99,8 @@ typedef struct { + #endif + #endif + ++#undef __fp ++ + #ifdef __cplusplus + } + #endif +-- +2.7.0.rc3 + |