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<a id="changeset-link" style="font-size:14px;font-weight:600;color:#0068FF;font-size: 14px; color: #0068FF; font-weight: 600;" href="https://github.com/ovsrobot/ovs/commit/5b8730f3ad61">5b8730f CHANGESET →</a>
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<p id="commit-message" style="margin:0px;font-family:cousine, monospace;font-size:14px;line-height:22px;font-family: cousine, monospace; font-size: 14px; text-align: left; line-height: 22px;">stream_ssl: fix important memory leak in ssl_connect() function<br><br>While checking valgrind reports after running "make check-valgrind" I have noticed<br>reports for several tests similar to the following:<br><br>....<br>==5345== Memcheck, a memory error detector<br>==5345== Copyright (C) 2002-2015, and GNU GPL'd, by Julian Seward et al.<br>==5345== Using Valgrind-3.11.0 and LibVEX; rerun with -h for copyright info<br>==5345== Command: ovsdb-client --private-key=/home/damijan.skvarc/doma/ovs/tests/testpki-privkey.pem --certificate=/home/damijan.skvarc/doma/ovs/tests/testpki-cert.pem --ca-cert=/home/damijan.skvarc/doma/ovs/tests/testpki-cacert.pem transact ssl:127.0.0.1:40111 \ \ \ ["ordinals",<br>==5345== \ \ \ \ \ \ {"op":\ "update",<br>==5345== \ \ \ \ \ \ \ "table":\ "ordinals",<br>==5345== \ \ \ \ \ \ \ "where":\ [["number",\ "==",\ 1]],<br>==5345== \ \ \ \ \ \ \ "row":\ {"number":\ 2,\ "name":\ "old\ two"}},<br>==5345== \ \ \ \ \ \ {"op":\ "update",<br>==5345== \ \ \ \ \ \ \ "table":\ "ordinals",<br>==5345== \ \ \ \ \ \ \ "where":\ [["name",\ "==",\ "two"]],<br>==5345== \ \ \ \ \ \ \ "row":\ {"number":\ 1,\ "name":\ "old\ one"}}]<br>==5345== Parent PID: 5344<br>==5345==<br>==5345==<br>==5345== HEAP SUMMARY:<br>==5345== in use at exit: 116,551 bytes in 3,341 blocks<br>==5345== total heap usage: 5,134 allocs, 1,793 frees, 412,290 bytes allocated<br>==5345==<br>==5345== 6,221 (184 direct, 6,037 indirect) bytes in 1 blocks are definitely lost in loss record 498 of 500<br>==5345== at 0x4C2DB8F: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)<br>==5345== by 0x5105E77: CRYPTO_malloc (in /lib/x86_64-linux-gnu/libcrypto.so.1.0.0)<br>==5345== by 0x51E1D23: ??? (in /lib/x86_64-linux-gnu/libcrypto.so.1.0.0)<br>==5345== by 0x51E4861: ??? (in /lib/x86_64-linux-gnu/libcrypto.so.1.0.0)<br>==5345== by 0x51E5414: ASN1_item_ex_d2i (in /lib/x86_64-linux-gnu/libcrypto.so.1.0.0)<br>==5345== by 0x51E546A: ASN1_item_d2i (in /lib/x86_64-linux-gnu/libcrypto.so.1.0.0)<br>==5345== by 0x4E56B27: ??? (in /lib/x86_64-linux-gnu/libssl.so.1.0.0)<br>==5345== by 0x4E5BA11: ??? (in /lib/x86_64-linux-gnu/libssl.so.1.0.0)<br>==5345== by 0x4E65145: ??? (in /lib/x86_64-linux-gnu/libssl.so.1.0.0)<br>==5345== by 0x4522DF: ssl_connect (stream-ssl.c:530)<br>==5345== by 0x443D38: scs_connecting (stream.c:315)<br>==5345== by 0x443D38: stream_connect (stream.c:338)<br>==5345== by 0x443FA1: stream_open_block (stream.c:266)<br>==5345== by 0x40AB79: open_jsonrpc (ovsdb-client.c:507)<br>==5345== by 0x40AB79: open_rpc (ovsdb-client.c:143)<br>==5345== by 0x40B06B: do_transact__ (ovsdb-client.c:871)<br>==5345== by 0x40B245: do_transact (ovsdb-client.c:893)<br>==5345== by 0x405F76: main (ovsdb-client.c:282)<br>==5345==<br>==5345== LEAK SUMMARY:<br>==5345== definitely lost: 184 bytes in 1 blocks<br>==5345== indirectly lost: 6,037 bytes in 117 blocks<br>==5345== possibly lost: 0 bytes in 0 blocks<br>==5345== still reachable: 110,330 bytes in 3,223 blocks<br>==5345== suppressed: 0 bytes in 0 blocks<br>==5345== Reachable blocks (those to which a pointer was found) are not shown.<br>==5345== To see them, rerun with: --leak-check=full --show-leak-kinds=all<br>==5345==<br>==5345== For counts of detected and suppressed errors, rerun with: -v<br>==5345== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 0 from 0)<br>....<br><br>This report was extracted from "index uniqueness checking" test and complains about<br>leaking memory in ovsdb-client application. The problem is not huge, since ovsdb-client<br>is CLI tool which is constantly reinvoked/restarted, thus leaked memory is not accumulated.<br><br>More problematic issue is that for the same test valgrind reports the similar problem also for<br>ovsdb-server:<br><br>....<br>==5290== Memcheck, a memory error detector<br>==5290== Copyright (C) 2002-2015, and GNU GPL'd, by Julian Seward et al.<br>==5290== Using Valgrind-3.11.0 and LibVEX; rerun with -h for copyright info<br>==5290== Command: ovsdb-server --log-file --detach --no-chdir --pidfile --private-key=/home/damijan.skvarc/doma/ovs/tests/testpki-privkey2.pem --certificate=/home/damijan.skvarc/doma/ovs/tests/testpki-cert2.pem --ca-cert=/home/damijan.skvarc/doma/ovs/tests/testpki-cacert.pem --remote=pssl:0:127.0.0.1 db<br>==5290== Parent PID: 5289<br>==5290==<br>==5292== Warning: noted but unhandled ioctl 0x2403 with no size/direction hints.<br>==5292== This could cause spurious value errors to appear.<br>==5292== See README_MISSING_SYSCALL_OR_IOCTL for guidance on writing a proper wrapper.<br>==5292== Warning: noted but unhandled ioctl 0x2400 with no size/direction hints.<br>==5292== This could cause spurious value errors to appear.<br>==5292== See README_MISSING_SYSCALL_OR_IOCTL for guidance on writing a proper wrapper.<br>==5290==<br>==5290== HEAP SUMMARY:<br>==5290== in use at exit: 2,066 bytes in 48 blocks<br>==5290== total heap usage: 87 allocs, 39 frees, 14,152 bytes allocated<br>==5290==<br>==5290== LEAK SUMMARY:<br>==5290== definitely lost: 0 bytes in 0 blocks<br>==5290== indirectly lost: 0 bytes in 0 blocks<br>==5290== possibly lost: 0 bytes in 0 blocks<br>==5290== still reachable: 2,066 bytes in 48 blocks<br>==5290== suppressed: 0 bytes in 0 blocks<br>==5290== Reachable blocks (those to which a pointer was found) are not shown.<br>==5290== To see them, rerun with: --leak-check=full --show-leak-kinds=all<br>==5290==<br>==5290== For counts of detected and suppressed errors, rerun with: -v<br>==5290== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 1 from 1)<br>==5292== Warning: noted but unhandled ioctl 0x2401 with no size/direction hints.<br>==5292== This could cause spurious value errors to appear.<br>==5292== See README_MISSING_SYSCALL_OR_IOCTL for guidance on writing a proper wrapper.<br>==5292==<br>==5292== HEAP SUMMARY:<br>==5292== in use at exit: 164,018 bytes in 4,252 blocks<br>==5292== total heap usage: 17,910 allocs, 13,658 frees, 1,907,468 bytes allocated<br>==5292==<br>==5292== 49,720 (1,472 direct, 48,248 indirect) bytes in 8 blocks are definitely lost in loss record 580 of 580<br>==5292== at 0x4C2DB8F: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)<br>==5292== by 0x5105E77: CRYPTO_malloc (in /lib/x86_64-linux-gnu/libcrypto.so.1.0.0)<br>==5292== by 0x51E1D23: ??? (in /lib/x86_64-linux-gnu/libcrypto.so.1.0.0)<br>==5292== by 0x51E4861: ??? (in /lib/x86_64-linux-gnu/libcrypto.so.1.0.0)<br>==5292== by 0x51E5414: ASN1_item_ex_d2i (in /lib/x86_64-linux-gnu/libcrypto.so.1.0.0)<br>==5292== by 0x51E546A: ASN1_item_d2i (in /lib/x86_64-linux-gnu/libcrypto.so.1.0.0)<br>==5292== by 0x4E53E00: ??? (in /lib/x86_64-linux-gnu/libssl.so.1.0.0)<br>==5292== by 0x4E55727: ??? (in /lib/x86_64-linux-gnu/libssl.so.1.0.0)<br>==5292== by 0x452C4B: ssl_connect (stream-ssl.c:530)<br>==5292== by 0x445B18: scs_connecting (stream.c:315)<br>==5292== by 0x445B18: stream_connect (stream.c:338)<br>==5292== by 0x445B91: stream_recv (stream.c:369)<br>==5292== by 0x432A9C: jsonrpc_recv.part.7 (jsonrpc.c:310)<br>==5292== by 0x433977: jsonrpc_recv (jsonrpc.c:1139)<br>==5292== by 0x433977: jsonrpc_session_recv (jsonrpc.c:1112)<br>==5292== by 0x40CCE3: ovsdb_jsonrpc_session_run (jsonrpc-server.c:553)<br>==5292== by 0x40CCE3: ovsdb_jsonrpc_session_run_all (jsonrpc-server.c:586)<br>==5292== by 0x40CCE3: ovsdb_jsonrpc_server_run (jsonrpc-server.c:401)<br>==5292== by 0x40682E: main_loop (ovsdb-server.c:209)<br>==5292== by 0x40682E: main (ovsdb-server.c:460)<br>==5292==<br>==5292== LEAK SUMMARY:<br>==5292== definitely lost: 1,472 bytes in 8 blocks<br>==5292== indirectly lost: 48,248 bytes in 936 blocks<br>==5292== possibly lost: 0 bytes in 0 blocks<br>==5292== still reachable: 114,298 bytes in 3,308 blocks<br>==5292== suppressed: 0 bytes in 0 blocks<br>==5292== Reachable blocks (those to which a pointer was found) are not shown.<br>==5292== To see them, rerun with: --leak-check=full --show-leak-kinds=all<br>==5292==<br>==5292== For counts of detected and suppressed errors, rerun with: -v<br>==5292== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 1 from 1)<br>....<br><br>In this case ovsdb-server is running as daemon process (--detach option) and leaking memory is<br>accumulated whenever ovsdb-client is reconnected. Within observed test ovsdb-client CLI tool<br>connects 8 times to ovsdb-server. Leaked memory in ovsdb-client (for each invocation) is approx.<br>6K bytes, while leaked memory in ovsdb-server is aprox. 48Kbytes what is actually 8*6K. Thus per<br>each connection both ovsdb-client and ovsdb-server leak approx. 6K bytes.<br><br>I have done a small manual test to check if ovsdb-server is indeed accumulating leaked memory<br>by dumping ovsdb-server in a loop:<br><br>console1:<br>ovsdb-server \<br>--log-file \<br>--detach --no-chdir --pidfile \<br>--private-key=testpki-privkey2.pem \<br>--certificate=testpki-cert2.pem \<br>--ca-cert=testpki-cacert.pem \<br>--remote=pssl:0:127.0.0.1 \<br>db<br><br>while (true); do \<br>ovsdb-client \<br>--private-key=testpki-privkey.pem \<br>--certificate=testpki-cert.pem \<br>--ca-cert=testpki-cacert.pem \<br>dump ssl:127.0.0.1:42067; \<br>done<br><br>console2:<br>watch -n 0.5 'cat /proc/$(pidof ovsdb-server)/status | grep VmSize'<br><br>In console2 it was evidently seen ovsdb-server is constantly leaking memory. After a while<br>(i.e. after a certain number of reconnections) the OOM killer jumps out and kills ovsdb-server.<br><br>Very similar situation was already noticed and described in<br>https://github.com/openvswitch/ovs-issues/issues/168. There, the problem pops up while connecting<br>controller to ovs-vswitchd daemon.<br><br>Valgrind reports point to a problem in openssl library, however after studying openssl code for<br>a while I have found out the problem is actually in ovs. When connection through SSL channel is<br>taken place openssl library allocates memory for keeping track of certificate. Reference to this<br>memory works very similar as std::shared_ptr pointer in recent C++ dialects. i.e. when allocated<br>memory is referenced its reference counter is incremented and decremented after the memory is<br>derefered. When reference counter becomes zero allocated memory is automatically deallocated.<br><br>In openssl library environment certificate is retrieved by calling SSL_get_peer_certificate()<br>where its reference counter is incremented. After retrieved certificate is not used any more its<br>reference counter must be decremented by calling X509_free(). If not, allocated memory is never<br>freed despite the ssl connection is properly closed.<br><br>The problem was caused in stream-ssl.c in function ssl_connect(), which retrieves common peer name<br>by calling SSL_get_peer_certificate() function and without calling X509_free() function afterwards.<br><br>Signed-off-by: Damijan Skvarc <damjan.skvarc@gmail.com><br>Signed-off-by: 0-day Robot <robot@bytheb.org></p>
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