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While stereotyped repetitions are frowned upon in literature, they serve a useful purpose in manual pages, because it is easier for the user to find certain information if it is always presented in the same way. For that reason, this commit harmonizes the varying formulations in the HISTORY section about which functions, flags, etc. were added in which OpenSSL version. It also attempts to make the pod files more grep friendly by avoiding to insert line breaks between the symbol names and the corresponding version number in which they were introduced (wherever possible). Some punctuation and typographical errors were fixed on the way. Reviewed-by: Tim Hudson <tjh@openssl.org> (Merged from https://github.com/openssl/openssl/pull/7854)
135 lines
4.9 KiB
Plaintext
135 lines
4.9 KiB
Plaintext
=pod
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=head1 NAME
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CRYPTO_secure_malloc_init, CRYPTO_secure_malloc_initialized,
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CRYPTO_secure_malloc_done, OPENSSL_secure_malloc, CRYPTO_secure_malloc,
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OPENSSL_secure_zalloc, CRYPTO_secure_zalloc, OPENSSL_secure_free,
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CRYPTO_secure_free, OPENSSL_secure_clear_free,
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CRYPTO_secure_clear_free, OPENSSL_secure_actual_size,
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CRYPTO_secure_used - secure heap storage
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=head1 SYNOPSIS
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#include <openssl/crypto.h>
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int CRYPTO_secure_malloc_init(size_t size, int minsize);
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int CRYPTO_secure_malloc_initialized();
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int CRYPTO_secure_malloc_done();
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void *OPENSSL_secure_malloc(size_t num);
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void *CRYPTO_secure_malloc(size_t num, const char *file, int line);
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void *OPENSSL_secure_zalloc(size_t num);
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void *CRYPTO_secure_zalloc(size_t num, const char *file, int line);
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void OPENSSL_secure_free(void* ptr);
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void CRYPTO_secure_free(void *ptr, const char *, int);
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void OPENSSL_secure_clear_free(void* ptr, size_t num);
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void CRYPTO_secure_clear_free(void *ptr, size_t num, const char *, int);
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size_t OPENSSL_secure_actual_size(const void *ptr);
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size_t CRYPTO_secure_used();
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=head1 DESCRIPTION
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In order to help protect applications (particularly long-running servers)
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from pointer overruns or underruns that could return arbitrary data from
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the program's dynamic memory area, where keys and other sensitive
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information might be stored, OpenSSL supports the concept of a "secure heap."
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The level and type of security guarantees depend on the operating system.
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It is a good idea to review the code and see if it addresses your
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threat model and concerns.
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If a secure heap is used, then private key B<BIGNUM> values are stored there.
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This protects long-term storage of private keys, but will not necessarily
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put all intermediate values and computations there.
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CRYPTO_secure_malloc_init() creates the secure heap, with the specified
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C<size> in bytes. The C<minsize> parameter is the minimum size to
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allocate from the heap. Both C<size> and C<minsize> must be a power
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of two.
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CRYPTO_secure_malloc_initialized() indicates whether or not the secure
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heap as been initialized and is available.
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CRYPTO_secure_malloc_done() releases the heap and makes the memory unavailable
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to the process if all secure memory has been freed.
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It can take noticeably long to complete.
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OPENSSL_secure_malloc() allocates C<num> bytes from the heap.
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If CRYPTO_secure_malloc_init() is not called, this is equivalent to
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calling OPENSSL_malloc().
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It is a macro that expands to
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CRYPTO_secure_malloc() and adds the C<__FILE__> and C<__LINE__> parameters.
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OPENSSL_secure_zalloc() and CRYPTO_secure_zalloc() are like
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OPENSSL_secure_malloc() and CRYPTO_secure_malloc(), respectively,
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except that they call memset() to zero the memory before returning.
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OPENSSL_secure_free() releases the memory at C<ptr> back to the heap.
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It must be called with a value previously obtained from
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OPENSSL_secure_malloc().
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If CRYPTO_secure_malloc_init() is not called, this is equivalent to
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calling OPENSSL_free().
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It exists for consistency with OPENSSL_secure_malloc() , and
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is a macro that expands to CRYPTO_secure_free() and adds the C<__FILE__>
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and C<__LINE__> parameters..
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OPENSSL_secure_clear_free() is similar to OPENSSL_secure_free() except
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that it has an additional C<num> parameter which is used to clear
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the memory if it was not allocated from the secure heap.
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If CRYPTO_secure_malloc_init() is not called, this is equivalent to
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calling OPENSSL_clear_free().
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OPENSSL_secure_actual_size() tells the actual size allocated to the
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pointer; implementations may allocate more space than initially
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requested, in order to "round up" and reduce secure heap fragmentation.
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CRYPTO_secure_used() returns the number of bytes allocated in the
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secure heap.
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=head1 RETURN VALUES
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CRYPTO_secure_malloc_init() returns 0 on failure, 1 if successful,
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and 2 if successful but the heap could not be protected by memory
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mapping.
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CRYPTO_secure_malloc_initialized() returns 1 if the secure heap is
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available (that is, if CRYPTO_secure_malloc_init() has been called,
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but CRYPTO_secure_malloc_done() has not been called or failed) or 0 if not.
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OPENSSL_secure_malloc() and OPENSSL_secure_zalloc() return a pointer into
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the secure heap of the requested size, or C<NULL> if memory could not be
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allocated.
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CRYPTO_secure_allocated() returns 1 if the pointer is in the secure heap, or 0 if not.
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CRYPTO_secure_malloc_done() returns 1 if the secure memory area is released, or 0 if not.
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OPENSSL_secure_free() and OPENSSL_secure_clear_free() return no values.
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=head1 SEE ALSO
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L<OPENSSL_malloc(3)>,
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L<BN_new(3)>
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=head1 HISTORY
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The OPENSSL_secure_clear_free() function was added in OpenSSL 1.1.0g.
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=head1 COPYRIGHT
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Copyright 2015-2016 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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