Commit f725fe5b authored by Matt Caswell's avatar Matt Caswell
Browse files

Fix a RUN_ONCE bug 



We have a number of instances where there are multiple "init" functions for
a single CRYPTO_ONCE variable, e.g. to load config automatically or to not
load config automatically. Unfortunately the RUN_ONCE mechanism was not
correctly giving the right return value where an alternative init function
was being used.

Reviewed-by: default avatarTim Hudson <tjh@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/7983)
parent d6399c85

crypto/init.c

+25 −13
Original line number Diff line number Diff line
@@ -177,12 +177,6 @@ DEFINE_RUN_ONCE_STATIC(ossl_init_load_crypto_nodelete) 


static CRYPTO_ONCE load_crypto_strings = CRYPTO_ONCE_STATIC_INIT;

static int load_crypto_strings_inited = 0;

DEFINE_RUN_ONCE_STATIC(ossl_init_no_load_crypto_strings)

{

    /* Do nothing in this case */

    return 1;

}



DEFINE_RUN_ONCE_STATIC(ossl_init_load_crypto_strings)

{

    int ret = 1;
@@ -201,6 +195,13 @@ DEFINE_RUN_ONCE_STATIC(ossl_init_load_crypto_strings) 
    return ret;

}



DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_load_crypto_strings,

                           ossl_init_load_crypto_strings)

{

    /* Do nothing in this case */

    return 1;

}



static CRYPTO_ONCE add_all_ciphers = CRYPTO_ONCE_STATIC_INIT;

DEFINE_RUN_ONCE_STATIC(ossl_init_add_all_ciphers)

{
@@ -218,6 +219,13 @@ DEFINE_RUN_ONCE_STATIC(ossl_init_add_all_ciphers) 
    return 1;

}



DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_add_all_ciphers,

                           ossl_init_add_all_ciphers)

{

    /* Do nothing */

    return 1;

}



static CRYPTO_ONCE add_all_digests = CRYPTO_ONCE_STATIC_INIT;

DEFINE_RUN_ONCE_STATIC(ossl_init_add_all_digests)

{
@@ -235,7 +243,8 @@ DEFINE_RUN_ONCE_STATIC(ossl_init_add_all_digests) 
    return 1;

}



DEFINE_RUN_ONCE_STATIC(ossl_init_no_add_algs)

DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_add_all_digests,

                           ossl_init_add_all_digests)

{

    /* Do nothing */

    return 1;
@@ -255,7 +264,7 @@ DEFINE_RUN_ONCE_STATIC(ossl_init_config) 
    config_inited = 1;

    return 1;

}

DEFINE_RUN_ONCE_STATIC(ossl_init_no_config)

DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_config, ossl_init_config)

{

#ifdef OPENSSL_INIT_DEBUG

    fprintf(stderr,
@@ -595,8 +604,9 @@ int OPENSSL_init_crypto(uint64_t opts, const OPENSSL_INIT_SETTINGS *settings) 
        return 0;



    if ((opts & OPENSSL_INIT_NO_LOAD_CRYPTO_STRINGS)

            && !RUN_ONCE(&load_crypto_strings,

                         ossl_init_no_load_crypto_strings))

            && !RUN_ONCE_ALT(&load_crypto_strings,

                             ossl_init_no_load_crypto_strings,

                             ossl_init_load_crypto_strings))

        return 0;



    if ((opts & OPENSSL_INIT_LOAD_CRYPTO_STRINGS)
@@ -604,7 +614,8 @@ int OPENSSL_init_crypto(uint64_t opts, const OPENSSL_INIT_SETTINGS *settings) 
        return 0;



    if ((opts & OPENSSL_INIT_NO_ADD_ALL_CIPHERS)

            && !RUN_ONCE(&add_all_ciphers, ossl_init_no_add_algs))

            && !RUN_ONCE_ALT(&add_all_ciphers, ossl_init_no_add_all_ciphers,

                             ossl_init_add_all_ciphers))

        return 0;



    if ((opts & OPENSSL_INIT_ADD_ALL_CIPHERS)
@@ -612,7 +623,8 @@ int OPENSSL_init_crypto(uint64_t opts, const OPENSSL_INIT_SETTINGS *settings) 
        return 0;



    if ((opts & OPENSSL_INIT_NO_ADD_ALL_DIGESTS)

            && !RUN_ONCE(&add_all_digests, ossl_init_no_add_algs))

            && !RUN_ONCE_ALT(&add_all_digests, ossl_init_no_add_all_digests,

                             ossl_init_add_all_digests))

        return 0;



    if ((opts & OPENSSL_INIT_ADD_ALL_DIGESTS)
@@ -624,7 +636,7 @@ int OPENSSL_init_crypto(uint64_t opts, const OPENSSL_INIT_SETTINGS *settings) 
        return 0;



    if ((opts & OPENSSL_INIT_NO_LOAD_CONFIG)

            && !RUN_ONCE(&config, ossl_init_no_config))

            && !RUN_ONCE_ALT(&config, ossl_init_no_config, ossl_init_config))

        return 0;



    if (opts & OPENSSL_INIT_LOAD_CONFIG) {

include/internal/thread_once.h

+92 −0
Original line number Diff line number Diff line
@@ -9,6 +9,20 @@ 


#include <openssl/crypto.h>



/*

 * DEFINE_RUN_ONCE: Define an initialiser function that should be run exactly

 * once. It takes no arguments and returns and int result (1 for success or

 * 0 for failure). Typical usage might be:

 *

 * DEFINE_RUN_ONCE(myinitfunc)

 * {

 *     do_some_initialisation();

 *     if (init_is_successful())

 *         return 1;

 *

 *     return 0;

 * }

 */

#define DEFINE_RUN_ONCE(init)                   \

    static int init(void);                     \

    int init##_ossl_ret_ = 0;                   \
@@ -17,10 +31,30 @@ 
        init##_ossl_ret_ = init();              \

    }                                           \

    static int init(void)



/*

 * DECLARE_RUN_ONCE: Declare an initialiser function that should be run exactly

 * once that has been defined in another file via DEFINE_RUN_ONCE().

 */

#define DECLARE_RUN_ONCE(init)                  \

    extern int init##_ossl_ret_;                \

    void init##_ossl_(void);



/*

 * DEFINE_RUN_ONCE_STATIC: Define an initialiser function that should be run

 * exactly once. This function will be declared as static within the file. It

 * takes no arguments and returns and int result (1 for success or 0 for

 * failure). Typical usage might be:

 *

 * DEFINE_RUN_ONCE_STATIC(myinitfunc)

 * {

 *     do_some_initialisation();

 *     if (init_is_successful())

 *         return 1;

 *

 *     return 0;

 * }

 */

#define DEFINE_RUN_ONCE_STATIC(init)            \

    static int init(void);                     \

    static int init##_ossl_ret_ = 0;            \
@@ -30,6 +64,46 @@ 
    }                                           \

    static int init(void)



/*

 * DEFINE_RUN_ONCE_STATIC_ALT: Define an alternative initialiser function. This

 * function will be declared as static within the file. It takes no arguments

 * and returns an int result (1 for success or 0 for failure). An alternative

 * initialiser function is expected to be associated with a primary initialiser

 * function defined via DEFINE_ONCE_STATIC where both functions use the same

 * CRYPTO_ONCE object to synchronise. Where an alternative initialiser function

 * is used only one of the primary or the alternative initialiser function will

 * ever be called - and that function will be called exactly once. Definitition

 * of an alternative initialiser function MUST occur AFTER the definition of the

 * primary initialiser function.

 *

 * Typical usage might be:

 *

 * DEFINE_RUN_ONCE_STATIC(myinitfunc)

 * {

 *     do_some_initialisation();

 *     if (init_is_successful())

 *         return 1;

 *

 *     return 0;

 * }

 *

 * DEFINE_RUN_ONCE_STATIC_ALT(myaltinitfunc, myinitfunc)

 * {

 *     do_some_alternative_initialisation();

 *     if (init_is_successful())

 *         return 1;

 *

 *     return 0;

 * }

 */

#define DEFINE_RUN_ONCE_STATIC_ALT(initalt, init) \

    static int initalt(void);                     \

    static void initalt##_ossl_(void)             \

    {                                             \

        init##_ossl_ret_ = initalt();             \

    }                                             \

    static int initalt(void)



/*

 * RUN_ONCE - use CRYPTO_THREAD_run_once, and check if the init succeeded

 * @once: pointer to static object of type CRYPTO_ONCE
@@ -43,3 +117,21 @@ 
 */

#define RUN_ONCE(once, init)                                            \

    (CRYPTO_THREAD_run_once(once, init##_ossl_) ? init##_ossl_ret_ : 0)



/*

 * RUN_ONCE_ALT - use CRYPTO_THREAD_run_once, to run an alternative initialiser

 *                function and check if that initialisation succeeded

 * @once:    pointer to static object of type CRYPTO_ONCE

 * @initalt: alternative initialiser function name that was previously given to

 *           DEFINE_RUN_ONCE_STATIC_ALT.  This function must return 1 for

 *           success or 0 for failure.

 * @init:    primary initialiser function name that was previously given to

 *           DEFINE_RUN_ONCE_STATIC.  This function must return 1 for success or

 *           0 for failure.

 *

 * The return value is 1 on success (*) or 0 in case of error.

 *

 * (*) by convention, since the init function must return 1 on success.

 */

#define RUN_ONCE_ALT(once, initalt, init)                               \

    (CRYPTO_THREAD_run_once(once, initalt##_ossl_) ? init##_ossl_ret_ : 0)

ssl/ssl_init.c

+4 −2
Original line number Diff line number Diff line
@@ -134,7 +134,8 @@ DEFINE_RUN_ONCE_STATIC(ossl_init_load_ssl_strings) 
    return 1;

}



DEFINE_RUN_ONCE_STATIC(ossl_init_no_load_ssl_strings)

DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_load_ssl_strings,

                           ossl_init_load_ssl_strings)

{

    /* Do nothing in this case */

    return 1;
@@ -207,7 +208,8 @@ int OPENSSL_init_ssl(uint64_t opts, const OPENSSL_INIT_SETTINGS * settings) 
        return 0;



    if ((opts & OPENSSL_INIT_NO_LOAD_SSL_STRINGS)

        && !RUN_ONCE(&ssl_strings, ossl_init_no_load_ssl_strings))

        && !RUN_ONCE_ALT(&ssl_strings, ossl_init_no_load_ssl_strings,

                         ossl_init_load_ssl_strings))

        return 0;



    if ((opts & OPENSSL_INIT_LOAD_SSL_STRINGS)