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Posted to dev@qpid.apache.org by "Jiri Daněk (Jira)" <ji...@apache.org> on 2019/10/19 19:09:00 UTC
[jira] [Updated] (PROTON-2122) Hardcoded limit of 16 sasl
mechanisms is insufficient on macOS
[ https://issues.apache.org/jira/browse/PROTON-2122?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jiri Daněk updated PROTON-2122:
-------------------------------
Environment: macOS 10.14 (was: macOS 10.4)
> Hardcoded limit of 16 sasl mechanisms is insufficient on macOS
> --------------------------------------------------------------
>
> Key: PROTON-2122
> URL: https://issues.apache.org/jira/browse/PROTON-2122
> Project: Qpid Proton
> Issue Type: Bug
> Components: proton-c
> Affects Versions: proton-c-0.29.0
> Environment: macOS 10.14
> Reporter: Jiri Daněk
> Priority: Major
>
> On macOS, any time a SASL exchange happens in tests, e.g. {{cpp-example-container}} or qpid dispatch tests, or when {{cpp/examples/simple_send}} connects to {{cpp/examples/broker}}, the broker crashes with the following stack trace
> {noformat}
> Thread 1 Crashed:
> 0 libsystem_kernel.dylib 0x00007fff697c62c6 __pthread_kill + 10
> 1 libsystem_pthread.dylib 0x00007fff69881bf1 pthread_kill + 284
> 2 libsystem_c.dylib 0x00007fff69730745 __abort + 144
> 3 libsystem_c.dylib 0x00007fff69730ff3 __stack_chk_fail + 205
> 4 libqpid-proton-core.10.dylib 0x0000000106d81f89 pni_post_sasl_frame + 1321
> 5 ??? 0x00007fd57acb59bb 0 + 140554864908731
> {noformat}
> AddressSanitizer (Valgrind does not run on most recent macOS releases) points out the reason.
> {noformat}
> $ ../cmake-build-debug/cpp/examples/broker
> broker listening on 5672
> =================================================================
> ==42793==ERROR: AddressSanitizer: stack-buffer-overflow on address 0x70000c4bcbe0 at pc 0x0001013663e1 bp 0x70000c4bc830 sp 0x70000c4bc828
> WRITE of size 8 at 0x70000c4bcbe0 thread T3
> #0 0x1013663e0 in pni_split_mechs sasl.c:443
> #1 0x1013646ea in pni_post_sasl_frame sasl.c:480
> #2 0x101357fad in pn_output_write_sasl sasl.c:677
> #3 0x101323909 in transport_produce transport.c:2751
> #4 0x10131ffd3 in pn_transport_pending transport.c:3030
> #5 0x1012b8755 in pn_connection_driver_write_buffer connection_driver.c:120
> #6 0x10120240f in leader_process_pconnection libuv.c:909
> #7 0x1011f8b48 in leader_lead_lh libuv.c:1008
> #8 0x1011f94f3 in pn_proactor_wait libuv.c:1062
> #9 0x10188c55d in proton::container::impl::thread() proactor_container_impl.cpp:753
> #10 0x1018bca31 in void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, void (proton::container::impl::*)(), proton::container::impl*> >(void*) thread:352
> #11 0x7fff6987f2ea in _pthread_body (libsystem_pthread.dylib:x86_64+0x32ea)
> #12 0x7fff69882248 in _pthread_start (libsystem_pthread.dylib:x86_64+0x6248)
> #13 0x7fff6987e40c in thread_start (libsystem_pthread.dylib:x86_64+0x240c)
> Address 0x70000c4bcbe0 is located in stack of thread T3 at offset 192 in frame
> #0 0x101363ccf in pni_post_sasl_frame sasl.c:462
> This frame has 3 object(s):
> [32, 48) 'out' (line 464)
> [64, 192) 'mechs' (line 475) <== Memory access at offset 192 overflows this variable
> [224, 228) 'count' (line 478)
> HINT: this may be a false positive if your program uses some custom stack unwind mechanism, swapcontext or vfork
> (longjmp and C++ exceptions *are* supported)
> Thread T3 created by T0 here:
> #0 0x101f5dadd in wrap_pthread_create (libclang_rt.asan_osx_dynamic.dylib:x86_64+0x56add)
> #1 0x1018bc4ab in std::__1::thread::thread<void (proton::container::impl::*)(), proton::container::impl*, void>(void (proton::container::impl::*&&)(), proton::container::impl*&&) thread:368
> #2 0x10188da97 in proton::container::impl::run(int) proactor_container_impl.cpp:802
> #3 0x100f0223c in main broker.cpp:427
> #4 0x7fff6968b3d4 in start (libdyld.dylib:x86_64+0x163d4)
> SUMMARY: AddressSanitizer: stack-buffer-overflow sasl.c:443 in pni_split_mechs
> Shadow bytes around the buggy address:
> 0x1e0001897920: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 0x1e0001897930: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 0x1e0001897940: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 0x1e0001897950: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 0x1e0001897960: 00 00 00 00 f1 f1 f1 f1 00 00 f2 f2 00 00 00 00
> =>0x1e0001897970: 00 00 00 00 00 00 00 00 00 00 00 00[f2]f2 f2 f2
> 0x1e0001897980: 04 f3 f3 f3 00 00 00 00 00 00 00 00 00 00 00 00
> 0x1e0001897990: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 0x1e00018979a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 0x1e00018979b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 0x1e00018979c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> Shadow byte legend (one shadow byte represents 8 application bytes):
> Addressable: 00
> Partially addressable: 01 02 03 04 05 06 07
> Heap left redzone: fa
> Freed heap region: fd
> Stack left redzone: f1
> Stack mid redzone: f2
> Stack right redzone: f3
> Stack after return: f5
> Stack use after scope: f8
> Global redzone: f9
> Global init order: f6
> Poisoned by user: f7
> Container overflow: fc
> Array cookie: ac
> Intra object redzone: bb
> ASan internal: fe
> Left alloca redzone: ca
> Right alloca redzone: cb
> Shadow gap: cc
> ==42793==ABORTING
> Abort trap: 6
> {noformat}
> The problem is that {{mechlist}} is (on my machine)
> {noformat}
> "SRP SRP GS2-IAKERB GS2-KRB5 SCRAM-SHA-1 SCRAM-SHA-256 SCRAM-SHA-256 SCRAM-SHA-1 GS2-KRB5 GS2-IAKERB GSS-SPNEGO GSSAPI GSS-SPNEGO GSSAPI DIGEST-MD5 DIGEST-MD5 OTP OTP NTLM CRAM-MD5 NTLM CRAM-MD5 ANONYMOUS ANONYMOUS"
> {noformat}
> which is over the limit of 16.
> This is not a security issue, because the mechanism list is created on server based on what cyrus-sasl mechs are installed. It is not based on data sent over the network.
> cc [~astitcher], [~rkieley]
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