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<p class="MsoNormal">I used memory debug functions (such as CRYPTO_mem_leaks/CRYPTO_mem_leaks_fp) to check the memory leak. In the old version, such as openssl-1.0.2d, I can call CRYPTO_mem_leaks() functions any time in my application to dump the memory information.
But in OpenSSL-1.1.0, it will fail due to the new CRYPTO_mem_leaks() introduce the RUN_ONCE() function to initialize the memory lock and cleanup the locks at the end of the function.<o:p></o:p></p>
<p class="MsoNormal">My application is a multi-process application, parent process will perform the memory lock initialization once, so in child process the RUN_ONCE() function will never be performed. After I perform CRYPTO_mem_leaks(), at the end of this
function, the malloc_lock will be freed, so it will cause unexpected coredump if I insert CRYPTO_mem_leaks() function in my code. What I can do now is register this function to atexit(), when the process exit, CRYPTO_mem_leaks() will be performed to dump the
memory leakage information. <o:p></o:p></p>
<p class="MsoNormal">Is this behavior expected?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">int CRYPTO_mem_leaks(BIO *b)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">{<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> MEM_LEAK ml;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> /*<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> * OPENSSL_cleanup() will free the ex_data locks so we can't have any<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> * ex_data hanging around<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> */<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> bio_free_ex_data(b);<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> /* Ensure all resources are released */<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> OPENSSL_cleanup();<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-family:"Courier New";color:red"> if (!RUN_ONCE(&memdbg_init, do_memdbg_init))<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-family:"Courier New";color:red"> return -1;<o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_DISABLE);<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> ml.bio = b;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> ml.bytes = 0;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> ml.chunks = 0;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> if (mh != NULL)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> lh_MEM_doall_MEM_LEAK(mh, print_leak, &ml);<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> if (ml.chunks != 0) {<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> BIO_printf(b, "%ld bytes leaked in %d chunks\n", ml.bytes, ml.chunks);<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> } else {<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> /*<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> * Make sure that, if we found no leaks, memory-leak debugging itself<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> * does not introduce memory leaks (which might irritate external<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> * debugging tools). (When someone enables leak checking, but does not<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> * call this function, we declare it to be their fault.)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> */<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> int old_mh_mode;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> CRYPTO_THREAD_write_lock(malloc_lock);<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> /*<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> * avoid deadlock when lh_free() uses CRYPTO_mem_debug_free(), which uses<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> * mem_check_on<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> */<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> old_mh_mode = mh_mode;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> mh_mode = CRYPTO_MEM_CHECK_OFF;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> lh_MEM_free(mh);<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> mh = NULL;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> mh_mode = old_mh_mode;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> CRYPTO_THREAD_unlock(malloc_lock);<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> }<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_OFF);<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> /* Clean up locks etc */<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> CRYPTO_THREAD_cleanup_local(&appinfokey);<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> CRYPTO_THREAD_lock_free(malloc_lock);<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> CRYPTO_THREAD_lock_free(long_malloc_lock);<o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-family:"Courier New";color:red"> malloc_lock = NULL;<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-family:"Courier New";color:red"> long_malloc_lock = NULL;<o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="font-family:"Courier New""><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-indent:27.0pt"><span style="font-family:"Courier New""> return ml.chunks == 0 ? 1 : 0;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">}</span><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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