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2020-09-02
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| 06:40 | • Ticket [e01f02a121] Segfault under wish at first tls::import, not under tclsh status still Open with 5 other changes artifact: a7a9eea528 user: anonymous | |
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2020-09-01
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| 09:44 | • Ticket [e01f02a121]: 6 changes artifact: bb8c278bf2 user: anonymous | |
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2020-08-20
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| 21:05 | • New ticket [e01f02a121]. artifact: 00a4ef8dc2 user: anonymous | |
| Ticket Hash: | e01f02a12180ac37cdb96ec16d0e03f89033cd77 | |||
| Title: | Segfault under wish at first tls::import, not under tclsh | |||
| Status: | Open | Type: | Build Problem | |
| Severity: | Critical | Priority: | Immediate | |
| Subsystem: | Resolution: | Open | ||
| Last Modified: | 2020-09-02 06:40:21 | |||
| Version Found In: | 1.7.21 | |||
| User Comments: | ||||
anonymous added on 2020-08-20 21:05:05:
Built TclTLS 1.7.21 on MacOS 10.6, against Tcl 8.6.10 and OpenSSL 1.1.1g.
Building went okay (once I figured out I need to make sure gen_dh_params
finds up the right version of the openssl program), and make test works.
Then I try the following minimal https operation:
% package require tls
1.7.21
% package require http
2.9.1
% http::register https 443 [list ::tls::socket -autoservername true -require true -cafile /usr/local/ssl/cert.pem]
443 {::tls::socket -autoservername true -require true -cafile /usr/local/ssl/cert.pem}
% set tok [http::geturl https://www.tcl-lang.org/]
Under tclsh, that works fine.
Under wish, it segfaults! Consistently.
More detailed breakdown, with debug build of tcltls:
----------- Begin output:
% package require tls
./tls.c:1779:Tls_Init():Called
./tls.c:1897:TlsLibInit():Called
./tlsBIO.c:53:BIO_new_tcl():BIO_new_tcl() called
./tlsBIO.c:66:BIO_new_tcl():Asked to setup a NULL state, just creating the initial configuration
1.7.21
% package require http
2.9.1
% http::register https 443 [list ::tls::socket -autoservername true -require true -cafile /usr/local/ssl/cert.pem]
443 {::tls::socket -autoservername true -require true -cafile /usr/local/ssl/cert.pem}
% set tok [http::geturl https://www.tcl-lang.org/]
./tls.c:759:ImportObjCmd():Called
./tls.c:1093:CTX_Init():Called
/usr/local/bin/wish: line 2: 67253 Segmentation fault "$(dirname $0)/../../../Library/Frameworks/Tk.framework/Versions/8.6/Resources/Wish.app/Contents/MacOS/Wish" "$@"
----------- End output.
----------- Begin crash report:
Process: Wish [67253]
Path: /usr/local/bin/../../../Library/Frameworks/Tk.framework/Versions/8.6/Resources/Wish.app/Contents/MacOS/Wish
Identifier: com.tcltk.wish
Version: 8.6.10 (8.6.10)
Code Type: X86-64 (Native)
Parent Process: sh [67251]
Date/Time: 2020-08-19 11:21:01.998 +0200
OS Version: Mac OS X 10.6.8 (10K549)
Report Version: 6
Interval Since Last Report: 84517688 sec
Crashes Since Last Report: 808
Per-App Interval Since Last Report: 62722 sec
Per-App Crashes Since Last Report: 5
Anonymous UUID: 1739C455-2439-487D-9ED0-2084ED6CAF3F
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x0000000000000000
Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Thread 0 Crashed: Dispatch queue: com.apple.main-thread
0 libSystem.B.dylib 0x00007fff870ed7ee pthread_rwlock_wrlock + 50
1 libcrypto.1.1.dylib 0x00000001150661ec CRYPTO_atomic_add + 44
2 libcrypto.1.1.dylib 0x0000000114f77041 DH_up_ref + 33
3 libcrypto.1.1.dylib 0x0000000114fff028 EVP_PKEY_set1_DH + 104
4 libssl.1.1.dylib 0x0000000114d454f2 ssl3_ctx_ctrl + 1538
5 tcltls.dylib 0x00000001006351c3 ImportObjCmd + 2963 (.tls.c:1265)
6 Tcl 0x000000010018496f Tcl_ListMathFuncs + 3856
7 Tcl 0x000000010017e279 TclNRRunCallbacks + 58
8 Tcl 0x0000000100202fa3 Tcl_RecordAndEvalObj + 499
9 Tcl 0x0000000100203003 Tcl_RecordAndEval + 70
10 Tk 0x000000010002c91a TkPointerEvent + 19546
11 Tcl 0x000000010020d98c Tcl_NotifyChannel + 219
12 Tcl 0x0000000100272f3d Tcl_Sleep + 923
13 Tcl 0x0000000100226605 Tcl_ServiceEvent + 147
14 Tcl 0x00000001002268f5 Tcl_DoOneEvent + 314
15 Tk 0x000000010001ee29 Tk_MainLoop + 24
16 Tk 0x000000010002d24a Tk_MainEx + 2067
17 Wish 0x0000000100005141 0x100000000 + 20801
18 Wish 0x000000010000507c 0x100000000 + 20604
Thread 1: Dispatch queue: com.apple.libdispatch-manager
0 libSystem.B.dylib 0x00007fff870a5c0a kevent + 10
1 libSystem.B.dylib 0x00007fff870a7add _dispatch_mgr_invoke + 154
2 libSystem.B.dylib 0x00007fff870a77b4 _dispatch_queue_invoke + 185
3 libSystem.B.dylib 0x00007fff870a72de _dispatch_worker_thread2 + 252
4 libSystem.B.dylib 0x00007fff870a6c08 _pthread_wqthread + 353
5 libSystem.B.dylib 0x00007fff870a6aa5 start_wqthread + 13
Thread 2:
0 libSystem.B.dylib 0x00007fff870d0932 select$DARWIN_EXTSN + 10
1 Tcl 0x0000000100273f38 Tcl_InitNotifier + 1582
2 libSystem.B.dylib 0x00007fff870c5fd6 _pthread_start + 331
3 libSystem.B.dylib 0x00007fff870c5e89 thread_start + 13
Thread 0 crashed with X86 Thread State (64-bit):
rax: 0x0000000000000000 rbx: 0x0000000000000000 rcx: 0x0000000000000000 rdx: 0x00007fff5fbfc5fc
rdi: 0x0000000000000000 rsi: 0x0000000000000001 rbp: 0x00007fff5fbfc5b0 rsp: 0x00007fff5fbfc570
r8: 0x0000000114f14aa0 r9: 0x00000001004fc0a4 r10: 0x0000000000000015 r11: 0x0000000100495c80
r12: 0x00000001004977a8 r13: 0x0000000000000001 r14: 0x00007fff70c83cc0 r15: 0x0000000100878a10
rip: 0x00007fff870ed7ee rfl: 0x0000000000010246 cr2: 0x0000000000000000
Binary Images:
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0x7fff86cae000 - 0x7fff86ccffe7 libPng.dylib ??? (???) <D8EC7740-EE32-865A-2F75-C9EDE2135510> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ImageIO.framework/Versions/A/Resources/libPng.dylib
0x7fff86cd0000 - 0x7fff86d3afe7 libvMisc.dylib 268.0.1 (compatibility 1.0.0) <AF0EA96D-000F-8C12-B952-CB7E00566E08> /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libvMisc.dylib
0x7fff8708c000 - 0x7fff8724dfef libSystem.B.dylib 125.2.11 (compatibility 1.0.0) <9AB4F1D1-89DC-0E8A-DC8E-A4FE4D69DB69> /usr/lib/libSystem.B.dylib
0x7fff8724e000 - 0x7fff87275ff7 libJPEG.dylib ??? (???) <08758593-6436-B29E-1DA8-F15597835EC1> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ImageIO.framework/Versions/A/Resources/libJPEG.dylib
0x7fff87276000 - 0x7fff87277ff7 com.apple.audio.units.AudioUnit 1.6.7 (1.6.7) <49B723D1-85F8-F86C-2331-F586C56D68AF> /System/Library/Frameworks/AudioUnit.framework/Versions/A/AudioUnit
0x7fff8741a000 - 0x7fff87427fe7 libCSync.A.dylib 545.0.0 (compatibility 64.0.0) <1C35FA50-9C70-48DC-9E8D-2054F7A266B1> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/CoreGraphics.framework/Versions/A/Resources/libCSync.A.dylib
0x7fff875e9000 - 0x7fff87666fef libstdc++.6.dylib 7.9.0 (compatibility 7.0.0) <35ECA411-2C08-FD7D-11B1-1B7A04921A5C> /usr/lib/libstdc++.6.dylib
0x7fff87667000 - 0x7fff876a8fff com.apple.SystemConfiguration 1.10.8 (1.10.2) <78D48D27-A9C4-62CA-2803-D0BBED82855A> /System/Library/Frameworks/SystemConfiguration.framework/Versions/A/SystemConfiguration
0x7fff87713000 - 0x7fff87773fe7 com.apple.framework.IOKit 2.0 (???) <4F071EF0-8260-01E9-C641-830E582FA416> /System/Library/Frameworks/IOKit.framework/Versions/A/IOKit
0x7fff87774000 - 0x7fff87831fff com.apple.CoreServices.OSServices 359.2 (359.2) <BBB8888E-18DE-5D09-3C3A-F4C029EC7886> /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/OSServices.framework/Versions/A/OSServices
0x7fff878fa000 - 0x7fff87ab8fff libicucore.A.dylib 40.0.0 (compatibility 1.0.0) <97A75BFB-0DB6-6F44-36B0-97B7F7208ABB> /usr/lib/libicucore.A.dylib
0x7fff87c9c000 - 0x7fff87cdafe7 libFontRegistry.dylib ??? (???) <395D7C0D-36B5-B353-0DC8-51ABC0B1C030> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ATS.framework/Versions/A/Resources/libFontRegistry.dylib
0x7fff87d37000 - 0x7fff88731ff7 com.apple.AppKit 6.6.8 (1038.36) <4CFBE04C-8FB3-B0EA-8DDB-7E7D10E9D251> /System/Library/Frameworks/AppKit.framework/Versions/C/AppKit
0x7fff88732000 - 0x7fff88848ff7 libxml2.2.dylib 10.3.0 (compatibility 10.0.0) <3814FCF9-92B9-A6AB-E76A-F7021894AA3F> /usr/lib/libxml2.2.dylib
0x7fff88849000 - 0x7fff888fefe7 com.apple.ink.framework 1.3.3 (107) <8C36373C-5473-3A6A-4972-BC29D504250F> /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/Ink.framework/Versions/A/Ink
0x7fff8894a000 - 0x7fff89154fe7 libBLAS.dylib 219.0.0 (compatibility 1.0.0) <2F26CDC7-DAE9-9ABE-6806-93BBBDA20DA0> /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libBLAS.dylib
0x7fff89398000 - 0x7fff893e1fef libGLU.dylib ??? (???) <B0F4CA55-445F-E901-0FCF-47B3B4BAE6E2> /System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGLU.dylib
0x7fff89583000 - 0x7fff89587ff7 libmathCommon.A.dylib 315.0.0 (compatibility 1.0.0) <95718673-FEEE-B6ED-B127-BCDBDB60D4E5> /usr/lib/system/libmathCommon.A.dylib
0x7fff8958e000 - 0x7fff89662fe7 com.apple.CFNetwork 454.12.4 (454.12.4) <C83E2BA1-1818-B3E8-5334-860AD21D1C80> /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/CFNetwork.framework/Versions/A/CFNetwork
0x7fff8975c000 - 0x7fff8975cff7 com.apple.vecLib 3.6 (vecLib 3.6) <96FB6BAD-5568-C4E0-6FA7-02791A58B584> /System/Library/Frameworks/vecLib.framework/Versions/A/vecLib
0x7fff89798000 - 0x7fff89798ff7 com.apple.Accelerate.vecLib 3.6 (vecLib 3.6) <4CCE5D69-F1B3-8FD3-1483-E0271DB2CCF3> /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/vecLib
0x7fff89b74000 - 0x7fff89c04fff com.apple.SearchKit 1.3.0 (1.3.0) <45BA1053-9196-3C2F-2421-AFF5E09627CC> /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/SearchKit.framework/Versions/A/SearchKit
0x7fff89e43000 - 0x7fff89e47ff7 libCGXType.A.dylib 545.0.0 (compatibility 64.0.0) <DB710299-B4D9-3714-66F7-5D2964DE585B> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/CoreGraphics.framework/Versions/A/Resources/libCGXType.A.dylib
0x7fff89eb1000 - 0x7fff89eb7ff7 com.apple.DiskArbitration 2.3 (2.3) <AAB5CC56-334A-3C60-3C27-54E8F34D754E> /System/Library/Frameworks/DiskArbitration.framework/Versions/A/DiskArbitration
0x7fff89ec6000 - 0x7fff89ffbfff com.apple.audio.toolbox.AudioToolbox 1.6.7 (1.6.7) <F4814A13-E557-59AF-30FF-E62929367933> /System/Library/Frameworks/AudioToolbox.framework/Versions/A/AudioToolbox
0x7fff89ffc000 - 0x7fff8a012fe7 com.apple.MultitouchSupport.framework 207.11 (207.11) <8233CE71-6F8D-8B3C-A0E1-E123F6406163> /System/Library/PrivateFrameworks/MultitouchSupport.framework/Versions/A/MultitouchSupport
0x7fff8a013000 - 0x7fff8a01afff com.apple.OpenDirectory 10.6 (10.6) <4FF6AD25-0916-B21C-9E88-2CC42D90EAC7> /System/Library/Frameworks/OpenDirectory.framework/Versions/A/OpenDirectory
0x7fff8a01b000 - 0x7fff8a032fff com.apple.ImageCapture 6.1 (6.1) <79AB2131-2A6C-F351-38A9-ED58B25534FD> /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/ImageCapture.framework/Versions/A/ImageCapture
0x7fff8a056000 - 0x7fff8a106fff edu.mit.Kerberos 6.5.11 (6.5.11) <085D80F5-C9DC-E252-C21B-03295E660C91> /System/Library/Frameworks/Kerberos.framework/Versions/A/Kerberos
0x7fff8a111000 - 0x7fff8a13cff7 libxslt.1.dylib 3.24.0 (compatibility 3.0.0) <3630A97F-55C1-3F34-CA63-3847653C9645> /usr/lib/libxslt.1.dylib
0x7fff8a13d000 - 0x7fff8a160fff com.apple.opencl 12.3.6 (12.3.6) <42FA5783-EB80-1168-4015-B8C68F55842F> /System/Library/Frameworks/OpenCL.framework/Versions/A/OpenCL
0x7fff8a17d000 - 0x7fff8a182fff libGIF.dylib ??? (???) <3BAD0DE8-8151-68B0-2244-A4541C738972> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ImageIO.framework/Versions/A/Resources/libGIF.dylib
0x7fff8a183000 - 0x7fff8a199fef libbsm.0.dylib ??? (???) <0321D32C-9FE1-3919-E03E-2530A0C1191B> /usr/lib/libbsm.0.dylib
0x7fff8a1f9000 - 0x7fff8a1fcff7 libCoreVMClient.dylib ??? (???) <75819794-3B7A-8944-D004-7EA6DD7CE836> /System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libCoreVMClient.dylib
0x7fff8a1fd000 - 0x7fff8a237fff libcups.2.dylib 2.8.0 (compatibility 2.0.0) <4F2A4397-89BD-DEAC-4971-EE838FFA0964> /usr/lib/libcups.2.dylib
0x7fff8a238000 - 0x7fff8a24afe7 libsasl2.2.dylib 3.15.0 (compatibility 3.0.0) <30FE378B-99FE-8C7C-06D0-A3AA0A0A70D4> /usr/lib/libsasl2.2.dylib
0x7fff8a267000 - 0x7fff8a269fff com.apple.print.framework.Print 6.1 (237.1) <CA8564FB-B366-7413-B12E-9892DA3C6157> /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/Print.framework/Versions/A/Print
0x7fff8a4b1000 - 0x7fff8a5d0ff7 libcrypto.0.9.8.dylib 0.9.8 (compatibility 0.9.8) <0CE8D59B-D0C7-1DCE-3654-37F27F61BEFA> /usr/lib/libcrypto.0.9.8.dylib
0x7fff8a67b000 - 0x7fff8a7b9fff com.apple.CoreData 102.1 (251) <9DFE798D-AA52-6A9A-924A-DA73CB94D81A> /System/Library/Frameworks/CoreData.framework/Versions/A/CoreData
0x7fff8a7ba000 - 0x7fff8a7cbff7 libz.1.dylib 1.2.3 (compatibility 1.0.0) <97019C74-161A-3488-41EC-A6CA8738418C> /usr/lib/libz.1.dylib
0x7fff8a7d5000 - 0x7fff8a7d8ff7 com.apple.securityhi 4.0 (36638) <AEF55AF1-54D3-DB8D-27A7-E16192E0045A> /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/SecurityHI.framework/Versions/A/SecurityHI
0x7fff8a7d9000 - 0x7fff8a7d9ff7 com.apple.Cocoa 6.6 (???) <C69E895A-1C66-3DA9-5F63-8BE85DB9C4E1> /System/Library/Frameworks/Cocoa.framework/Versions/A/Cocoa
0x7fffffe00000 - 0x7fffffe01fff libSystem.B.dylib ??? (???) <9AB4F1D1-89DC-0E8A-DC8E-A4FE4D69DB69> /usr/lib/libSystem.B.dylib
Model: MacBookPro7,1, BootROM MBP71.0039.B0B, 2 processors, Intel Core 2 Duo, 2.4 GHz, 4 GB, SMC 1.62f7
Graphics: NVIDIA GeForce 320M, NVIDIA GeForce 320M, PCI, 256 MB
Memory Module: global_name
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x8D), Broadcom BCM43xx 1.0 (5.10.131.42.4)
Bluetooth: Version 2.4.5f3, 2 service, 12 devices, 1 incoming serial ports
Network Service: AirPort, AirPort, en1
Serial ATA Device: HL-DT-ST DVDRW GS23N
USB Device: Built-in iSight, 0x05ac (Apple Inc.), 0x8507, 0x24600000 / 2
USB Device: USB to ATA/ATAPI Bridge, 0x357d, 0x7788, 0x26400000 / 3
USB Device: Internal Memory Card Reader, 0x05ac (Apple Inc.), 0x8403, 0x26100000 / 2
USB Device: BRCM2046 Hub, 0x0a5c (Broadcom Corp.), 0x4500, 0x06600000 / 4
USB Device: Bluetooth USB Host Controller, 0x05ac (Apple Inc.), 0x8213, 0x06610000 / 5
USB Device: IR Receiver, 0x05ac (Apple Inc.), 0x8242, 0x06500000 / 3
USB Device: Apple Internal Keyboard / Trackpad, 0x05ac (Apple Inc.), 0x0237, 0x06300000 / 2
----------- End crash report.
As far as I can tell, what is going on here is that OpenSSL wants to
increase the refcount on those darn DH params (or maybe part thereof),
seeks to acquire a lock on that refcount, and then crashes.
It's worth noticing openssl-1.1.1g/include/internal/refcount.h contains
a number of implementations of the CRYPTO_UP_REF and CRYPTO_DOWN_REF
operations, most of which don't seem to use the final lock parameter
of these macros, but my compiler ends up using the very last definition,
which calls various pthread_??? functions with that as argument, so
someone forgetting to initialise that lock could handily explain what
is going wrong here.
Whether that error would be on the part of OpenSSL or TclTLS, however,
I couldn't say. But all OpenSSL tests pass.
anonymous (claiming to be lars_h) added on 2020-09-01 09:44:20: Okay, I think I've diagnosed this now, though I don't know how to fix it. There doesn't seem to be an error in the TclTLS source code as such, so the fix is probably rather to adjust the build process -- figure out the right options to pass, and it should work. However I suspect TclTLS still needs improving because of this issue, since it does seem to be a more general vulnerability; it should be easy to make a hardened build, even if one does not make it the default. In short, the problem is that under Wish I'm getting two different versions of libcrypto loaded, and the dynamic linker is making TclTLS call some functions from one version and other functions from the other; since they are rather far from being binary compatible, a crash is only to be expected. tclsh avoids the problem by not loading the first version of libcrypto, so that all calls go to the second version against which TclTLS was actually built, *but*: should tclsh load any other library with a dependence upon the first libcrypto version before it loads TclTLS then the problem will surface also there. Right now TclTLS is vulnerable in that it depends on other parties not doing things it hadn't expected, instead of making sure that it gets what it requires. It might be argued that having different versions of a library in the same process is a big no-no, and that the fix is to update everything to use the same most recent version, but that is frankly impossible; the old libcrypto is being brought in by some system library (don't know which one, but the one next to it in the list is called TrustEvaluationAgent, which seems a plausible user) and this ain't linux -- we can't hope to go recompiling those. Moreover it might be remarked that the (long) list of shared libraries Wish loads includes a decade-old libsqlite3.dylib, but that has never been a problem for tclsqlite3, presumably because that links statically with the sqlite3 library. I see no reason why TclTLS couldn't have an option to do the same, but I cannot find anything in the documentation to that effect. Indeed, the documentation for OpenSSL 1.0.x strongly recommends linking statically against the library (for security reasons), though the OpenSSL 1.1.x documentation does not make this point (that I can see). I have however only been able to build TclTLS to link against the dylibs. Much longer, my investigation was as follows: I saw the program crash in pthread_rwlock_wrlock, called from the SSL_CTX_set_tmp_dh(ctx, dh); line in CTX_Init (tls.c around line 1260, but I've done some hacking to debug so my line numbers are off), with a KERN_INVALID_ADDRESS at 0x0000000000000000 So... a NULL pointer dereferencing. It turns out the pointer in question is dh->lock up in tls.c (or it would be, had the DH type not been opaque in tls.c, but it is a field in the struct that dh points to). What SSL_CTX_set_tmp_dh is doing at the time of the crash is that it is adjusting the refcount of those DH parameters, and the lock in question is protecting that refcount. The CRYPTO_UP_REF operation being used does have something like four different implementations, many of which don't need this lock at all (but not the last resort implementation via pthreads I end up with), so it would not be outrageous to suspect a bug in libcrypto where this field never gets initialised, but that is not what is going on. Some hacking to insert statements printing the value of dh->lock reveals that it is indeed NULL when run under Wish, but non-NULL when run under tclsh. Some more hacking in dh_params.h reveals that this is what that struct is like already when DH_new returns it. This could still be a matter of uninitialised memory just happening to have a fortuitous value in tclsh but not Wish, though to be sure one needs to see what DH_new (or rather the underlying DH_new_method, both living in openssl-1.1.1g/crypto/dh/dh_lib.c) is doing. This is where things get weird, because from RTFS that function has an explicit check whether lock is NULL, and will return NULL for the dh pointer if it is. Yet when run, DH_new is returning a non-NULL pointer for dh such that dh->lock is NULL. This should not happen. Might some later instruction in DH_new_method be overwriting the lock with garbage? Only way to tell is to bring out a debugger. That's where things get *really* weird. (In retrospect, working with this issue the first time one uses gdb is probably not ideal, but hey, I've learnt some gdb now! Good for me.) For some reason, gdb refuses to step into the DH_new function, complaining about there not being line number information available. In retrospect this could have been a clue, but I spend a lot of time fiddling with compiler options for debug information, hoping that this will do the trick. It might even have helped a bit, but eventually I'm down to stepping at the machine code level. The gdb list command is not showing anything that makes sense, but the disassemble command is my friend, once I refresh myself on the memnonics. What I see is … plausibly the DH_new_method function, but it looks like it has been optimised to hell and back, and indeed the crucial CRYPTO_THREAD_lock_new call is missing. But this libcrypto was compiled with -O0, so why would it be optimised?? Indeed, when running gdb on just libcrypto.1.1.dylib I get a disassembly looking the way I might expect (even overly roundabout). Even more strange, I get the same listing when I ask the gdb debugging Wish to disassemble DH_new_method So why isn't *that* the code that this process is running?? Then it hits me: the addresses don't match. The good DH_new_method is at 0x0000000114e7bfe0, but the one that gets called is at 0x00007fff8a4e6e90. gdb says both are called DH_new_method, but 0x00007fff8a4e6e90 is in libcrypto.0.9.8.dylib, whereas 0x0000000114e7bfe0 is in libcrypto.1.1.dylib, just like call that invokes the CRYPTO_UP_REF operation. Mystery solved, to some extent. Now I only need to figure out how to make TclTLS bind to the right instances of these symbols. It would help getting some input from people who actually know how all these things are supposed to fit together, instead of having to guess while randomly poking. anonymous (claiming to be lars_h) added on 2020-09-02 06:40:21: Huh, that was easier to solve than I thought. First, the easiest way of demonstrating that the symbol bindings are wrong is to set the environment variable DYLD_PRINT_BINDINGS. With that, and the default linker flags for shared-tcltls.dylib, we get (in the vicinity of DH_new): dyld: lazy forcedbind: tcltls.dylib:0x100742118 = libcrypto.0.9.8.dylib:_DH_free, *0x100742118 = 0x7FFF8A4E6D50 dyld: lazy forcedbind: tcltls.dylib:0x100742120 = libcrypto.0.9.8.dylib:_DH_new, *0x100742120 = 0x7FFF8A4E70D0 dyld: lazy forcedbind: tcltls.dylib:0x100742128 = libcrypto.1.1.dylib:_DH_set0_pqg, *0x100742128 = 0x114E7C52A dyld: lazy forcedbind: tcltls.dylib:0x100742130 = libcrypto.0.9.8.dylib:_ERR_clear_error, *0x100742130 = 0x7FFF8A52DB30 dyld: lazy forcedbind: tcltls.dylib:0x100742138 = libcrypto.0.9.8.dylib:_ERR_get_error, *0x100742138 = 0x7FFF8A52DB10 dyld: lazy forcedbind: tcltls.dylib:0x100742140 = libcrypto.0.9.8.dylib:_ERR_reason_error_string, *0x100742140 = 0x7FFF8A550810 dyld: lazy forcedbind: tcltls.dylib:0x100742148 = libcrypto.0.9.8.dylib:_EVP_PKEY_assign, *0x100742148 = 0x7FFF8A4BDBA0 dyld: lazy forcedbind: tcltls.dylib:0x100742150 = libcrypto.0.9.8.dylib:_EVP_PKEY_free, *0x100742150 = 0x7FFF8A4BDAD0 dyld: lazy forcedbind: tcltls.dylib:0x100742158 = libcrypto.0.9.8.dylib:_EVP_PKEY_new, *0x100742158 = 0x7FFF8A4BD410 dyld: lazy forcedbind: tcltls.dylib:0x100742160 = libcrypto.0.9.8.dylib:_EVP_md5, *0x100742160 = 0x7FFF8A4F6F50 dyld: lazy forcedbind: tcltls.dylib:0x100742168 = libcrypto.0.9.8.dylib:_EVP_sha1, *0x100742168 = 0x7FFF8A55B140 dyld: lazy forcedbind: tcltls.dylib:0x100742170 = libcrypto.1.1.dylib:_OPENSSL_init_crypto, *0x100742170 = 0x114F10356 dyld: lazy forcedbind: tcltls.dylib:0x100742178 = libssl.1.1.dylib:_OPENSSL_init_ssl, *0x100742178 = 0x114D244F9 dyld: lazy forcedbind: tcltls.dylib:0x100742180 = libcrypto.1.1.dylib:_OPENSSL_sk_num, *0x100742180 = 0x114F7B653 dyld: lazy forcedbind: tcltls.dylib:0x100742188 = libcrypto.1.1.dylib:_OPENSSL_sk_value, *0x100742188 = 0x114F7B67B Further up there are a lot more binding to libcrypto.1.1.dylib, so it's not as much 0.9.8 overall as this excerpt might suggest, but any amount of schizophrenic bindings is a crash waiting to happen. Now why are the bindings done in this crazy way? It turns out the standard LDFLAGS include -flat_namespace which literally means "don't pay attention to what library a symbol should be from, just grab the first symbol with the right name that comes along". Pretty much the source of these troubles, isn't it? Indeed, if removing that flag and the subsequent -undefined suppress from the LDFLAGS, tcltls still builds just fine, and the bindings now look sane: dyld: lazy forcedbind: tcltls.dylib:0x100642118 = libcrypto.1.1.dylib:_DH_free, *0x100642118 = 0x114F7C221 dyld: lazy forcedbind: tcltls.dylib:0x100642120 = libcrypto.1.1.dylib:_DH_new, *0x100642120 = 0x114F7BFD0 dyld: lazy forcedbind: tcltls.dylib:0x100642128 = libcrypto.1.1.dylib:_DH_set0_pqg, *0x100642128 = 0x114F7C52A dyld: lazy forcedbind: tcltls.dylib:0x100642130 = libcrypto.1.1.dylib:_ERR_clear_error, *0x100642130 = 0x114FE1ACE dyld: lazy forcedbind: tcltls.dylib:0x100642138 = libcrypto.1.1.dylib:_ERR_get_error, *0x100642138 = 0x114FE1BD4 dyld: lazy forcedbind: tcltls.dylib:0x100642140 = libcrypto.1.1.dylib:_ERR_reason_error_string, *0x100642140 = 0x114FE26A1 dyld: lazy forcedbind: tcltls.dylib:0x100642148 = libcrypto.1.1.dylib:_EVP_PKEY_assign, *0x100642148 = 0x11500686E dyld: lazy forcedbind: tcltls.dylib:0x100642150 = libcrypto.1.1.dylib:_EVP_PKEY_free, *0x100642150 = 0x115006DE8 dyld: lazy forcedbind: tcltls.dylib:0x100642158 = libcrypto.1.1.dylib:_EVP_PKEY_new, *0x100642158 = 0x115006002 dyld: lazy forcedbind: tcltls.dylib:0x100642160 = libcrypto.1.1.dylib:_EVP_md5, *0x100642160 = 0x115002E37 dyld: lazy forcedbind: tcltls.dylib:0x100642168 = libcrypto.1.1.dylib:_EVP_sha1, *0x100642168 = 0x11500353E dyld: lazy forcedbind: tcltls.dylib:0x100642170 = libcrypto.1.1.dylib:_OPENSSL_init_crypto, *0x100642170 = 0x115010356 dyld: lazy forcedbind: tcltls.dylib:0x100642178 = libssl.1.1.dylib:_OPENSSL_init_ssl, *0x100642178 = 0x114E244F9 dyld: lazy forcedbind: tcltls.dylib:0x100642180 = libcrypto.1.1.dylib:_OPENSSL_sk_num, *0x100642180 = 0x11507B653 dyld: lazy forcedbind: tcltls.dylib:0x100642188 = libcrypto.1.1.dylib:_OPENSSL_sk_value, *0x100642188 = 0x11507B67B Not a 0.9.8 in sight, and now I can have wish eval http::geturl https://www.tcl-lang.org/ without segfaulting. Promising, but maybe a proper fix should rather be in the Tcl build system, since that is what contributes the -flat_namespace. Time for another bug report, I suppose. | ||||