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Use strerror_r()/strerror_s() instead of strerror() where possible

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The function strerror() is not thread safe. We should use strerror_r()
where possible, or strerror_s() on Windows.

RT#2267

Reviewed-by: Richard Levitte <levitte@openssl.org>
This commit is contained in:
Matt Caswell 2016-05-23 13:52:29 +01:00
parent a93e0e78db
commit 7d37818dac
4 changed files with 37 additions and 7 deletions
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8
crypto/dso/dso_dl.c
View File

@ -66,8 +66,10 @@ static int dl_load(DSO *dso)
(dso->flags & DSO_FLAG_NO_NAME_TRANSLATION ? 0 :
DYNAMIC_PATH), 0L);
if (ptr == NULL) {
char errbuf[160];
DSOerr(DSO_F_DL_LOAD, DSO_R_LOAD_FAILED);
ERR_add_error_data(4, "filename(", filename, "): ", strerror(errno));
if (openssl_strerror_r(errno, errbuf, sizeof(errbuf)))
ERR_add_error_data(4, "filename(", filename, "): ", errbuf);
goto err;
}
if (!sk_push(dso->meth_data, (char *)ptr)) {
@ -130,8 +132,10 @@ static DSO_FUNC_TYPE dl_bind_func(DSO *dso, const char *symname)
return (NULL);
}
if (shl_findsym(&ptr, symname, TYPE_UNDEFINED, &sym) < 0) {
char errbuf[160];
DSOerr(DSO_F_DL_BIND_FUNC, DSO_R_SYM_FAILURE);
ERR_add_error_data(4, "symname(", symname, "): ", strerror(errno));
if (openssl_strerror_r(errno, errbuf, sizeof(errbuf)))
ERR_add_error_data(4, "symname(", symname, "): ", errbuf);
return (NULL);
}
return ((DSO_FUNC_TYPE)sym);

6
crypto/err/err.c
View File

@ -220,12 +220,8 @@ static void build_SYS_str_reasons(void)
str->error = (unsigned long)i;
if (str->string == NULL) {
char (*dest)[LEN_SYS_STR_REASON] = &(strerror_tab[i - 1]);
char *src = strerror(i);
if (src != NULL) {
strncpy(*dest, src, sizeof(*dest));
(*dest)[sizeof(*dest) - 1] = '\0';
if (openssl_strerror_r(i, *dest, sizeof(*dest)))
str->string = *dest;
}
}
if (str->string == NULL)
str->string = "unknown";

2
crypto/include/internal/cryptlib.h
View File

@ -67,6 +67,8 @@ void OPENSSL_showfatal(const char *fmta, ...);
extern int OPENSSL_NONPIC_relocated;
void crypto_cleanup_all_ex_data_int(void);
int openssl_strerror_r(int errnum, char *buf, size_t buflen);
#ifdef __cplusplus
}
#endif

28
crypto/o_str.c
View File

@ -258,3 +258,31 @@ char *OPENSSL_buf2hexstr(const unsigned char *buffer, long len)
return tmp;
}
int openssl_strerror_r(int errnum, char *buf, size_t buflen)
{
#if defined(OPENSSL_SYS_WINDOWS)
if (strerror_s(buf, buflen, errnum) == EINVAL)
return 0;
return 1;
#elif (_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600) && !_GNU_SOURCE
/*
* We can use "real" strerror_r. The OpenSSL version differs in that it
* gives 1 on success and 0 on failure for consistency with other OpenSSL
* functions. Real strerror_r does it the other way around
*/
return !strerror_r(errnum, buf, buflen);
#else
char *err;
/* Fall back to non-thread safe strerror()...its all we can do */
if (buflen < 2)
return 0;
err = strerror(errnum);
/* Can this ever happen? */
if (err == NULL)
return 0;
strncpy(buf, err, buflen - 1);
buf[buflen - 1] = '\0';
return 1;
#endif
}