Date: Sat, 26 Jan 2013 13:54:55 +0100 From: magnum <john.magnum@...hmail.com> To: john-dev@...ts.openwall.com Subject: Office format bug Dhiru, According to Valgrind, the office format seem to read data from all over the place. Benchmarking: Office 2007/2010 (SHA-1) / 2013 (SHA-512), with AES [32/64 OpenSSL]... ==22939== Use of uninitialised value of size 8 ==22939== at 0x510B254: _x86_64_AES_decrypt_compact (aes-x86_64.s:577) ==22939== by 0x510B571: AES_decrypt (aes-x86_64.s:828) ==22939== by 0x7FEFFD60F: ??? ==22939== by 0x7FEFFD6AF: ??? ==22939== by 0x7FEFFD74F: ??? ==22939== by 0x7FEFFD487: ??? ==22939== by 0x1B806F31BFF453C9: ??? ==22939== by 0xD342D7A2989D9B7F: ??? ==22939== by 0x9A9C13A0008FA466: ??? ==22939== by 0x73F06698C26CEE8: ??? ==22939== by 0x491480AF3479AF71: ??? ==22939== by 0x5CD4A62CAB0D44C6: ??? ==22939== Uninitialised value was created by a heap allocation ==22939== at 0x4C2B3F8: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so) ==22939== by 0x546ABC: mem_alloc (memory.c:54) ==22939== by 0x546BBA: mem_alloc_tiny (memory.c:86) ==22939== by 0x546C95: mem_calloc_tiny (memory.c:100) ==22939== by 0x4E0574: init (mysql_netauth_fmt_plug.c:62) ==22939== by 0x53DDAA: fmt_init (formats.c:36) ==22939== by 0x536658: benchmark_all (bench.c:418) ==22939== by 0x542E62: john_run (john.c:685) ==22939== by 0x543601: main (john.c:956) ==22939== ... According to this, it reads an "uninitialized value" from mysql-netauth format's buffer space... not that I get how a calloc'ed buffer can be uninitialized. The above is from --test=0 under linux 64-bit, built with OMP but using only one thread. I am actually trying to find some format thrashing memory. Under OSX the krb5-23 format fails, only on OMP builds (but even when OMP_NUM_THREADS=1) and only during --test (all formats). And this problem goes away if I register the krb5 formats before the plugins, so it is one of the plugin formats that thrashes memory. The krb5-23 format is not the actual problem. And the above only seem to read, not write. magnum
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