Commit c2b3db24 authored by Matt Caswell's avatar Matt Caswell
Browse files

Implement OPENSSL_INIT_NO_ATEXIT 



Reviewed-by: default avatarTim Hudson <tjh@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/7983)
parent f725fe5b

crypto/init.c

+32 −4
Original line number Diff line number Diff line
@@ -100,10 +100,6 @@ DEFINE_RUN_ONCE_STATIC(ossl_init_base) 
        return 0;

    if ((init_lock = CRYPTO_THREAD_lock_new()) == NULL)

        goto err;

#ifndef OPENSSL_SYS_UEFI

    if (atexit(OPENSSL_cleanup) != 0)

        goto err;

#endif

    OPENSSL_cpuid_setup();



    destructor_key.value = key;
@@ -121,6 +117,30 @@ err: 
    return 0;

}



static CRYPTO_ONCE register_atexit = CRYPTO_ONCE_STATIC_INIT;

DEFINE_RUN_ONCE_STATIC(ossl_init_register_atexit)

{

# ifdef OPENSSL_INIT_DEBUG

    fprintf(stderr, "OPENSSL_INIT: ossl_init_register_atexit()\n");

# endif

#ifndef OPENSSL_SYS_UEFI

    if (atexit(OPENSSL_cleanup) != 0)

        return 0;

#endif



    return 1;

}



DEFINE_RUN_ONCE_STATIC_ALT(ossl_init_no_register_atexit,

                           ossl_init_register_atexit)

{

#ifdef OPENSSL_INIT_DEBUG

    fprintf(stderr, "OPENSSL_INIT: ossl_init_no_register_atexit ok!\n");

#endif

    /* Do nothing in this case */

    return 1;

}



static CRYPTO_ONCE load_crypto_nodelete = CRYPTO_ONCE_STATIC_INIT;

DEFINE_RUN_ONCE_STATIC(ossl_init_load_crypto_nodelete)

{
@@ -598,6 +618,14 @@ int OPENSSL_init_crypto(uint64_t opts, const OPENSSL_INIT_SETTINGS *settings) 
    if (!RUN_ONCE(&base, ossl_init_base))

        return 0;



    if ((opts & OPENSSL_INIT_NO_ATEXIT) != 0) {

        if (!RUN_ONCE_ALT(&register_atexit, ossl_init_no_register_atexit,

                          ossl_init_register_atexit))

            return 0;

    } else if (!RUN_ONCE(&register_atexit, ossl_init_register_atexit)) {

        return 0;

    }



    if (!(opts & OPENSSL_INIT_BASE_ONLY)

            && !RUN_ONCE(&load_crypto_nodelete,

                         ossl_init_load_crypto_nodelete))

doc/man3/OPENSSL_init_crypto.pod

+8 −1
Original line number Diff line number Diff line
@@ -33,7 +33,7 @@ As of version 1.1.0 OpenSSL will automatically allocate all resources that it 
needs so no explicit initialisation is required. Similarly it will also

automatically deinitialise as required.



However, there way be situations when explicit initialisation is desirable or

However, there may be situations when explicit initialisation is desirable or

needed, for example when some non-default initialisation is required. The

function OPENSSL_init_crypto() can be used for this purpose for

libcrypto (see also L<OPENSSL_init_ssl(3)> for the libssl
@@ -157,6 +157,13 @@ engines. This not a default option. 
With this option the library will register its fork handlers.

See OPENSSL_fork_prepare(3) for details.



=item OPENSSL_INIT_NO_ATEXIT



By default OpenSSL will attempt to clean itself up when the process exits via an

"atexit" handler. Using this option suppresses that behaviour. This means that

the application will have to clean up OpenSSL explicitly using

OPENSSL_cleanup().



=back



Multiple options may be combined together in a single call to

include/openssl/crypto.h

+1 −0
Original line number Diff line number Diff line
@@ -377,6 +377,7 @@ int CRYPTO_memcmp(const void * in_a, const void * in_b, size_t len); 
/* OPENSSL_INIT_ZLIB                         0x00010000L */

# define OPENSSL_INIT_ATFORK                 0x00020000L

/* OPENSSL_INIT_BASE_ONLY                    0x00040000L */

# define OPENSSL_INIT_NO_ATEXIT              0x00080000L

/* OPENSSL_INIT flag range 0xfff00000 reserved for OPENSSL_init_ssl() */

/* Max OPENSSL_INIT flag value is 0x80000000 */