[lldb-dev] Cannot use system debugserver for testing

Mon Jul 22 07:34:22 PDT 2019

Well, SIP is turned off and I experience the same with a binary I just
built:
```
egbomrt at msmarple ~/llvm2/build/release_assert $ csrutil status
System Integrity Protection status: disabled.
egbomrt at msmarple ~/llvm2/build/release_assert $ ./bin/lldb ~/a.out
(lldb) target create "/Users/egbomrt/a.out"
Current executable set to '/Users/egbomrt/a.out' (x86_64).
(lldb) r
error: process exited with status -1 (Error 1)
(lldb) ^D
egbomrt at msmarple ~/llvm2/build/release_assert $ ls -la ~/a.out
-rwxr-xr-x  1 egbomrt  admin  8736 Júl 22 16:16 /Users/egbomrt/a.out
egbomrt at msmarple ~/llvm2/build/release_assert $
```

On Mon, Jul 22, 2019 at 4:29 PM Stefan Gränitz <stefan.graenitz at gmail.com>
wrote:

> egbomrt at msmarple ~/llvm2/build/release_assert $ ./bin/lldb /bin/ls
> (lldb) target create "/bin/ls"
> Current executable set to '/bin/ls' (x86_64).
> (lldb) r
> *error: process exited with status -1 (Error 1)*
>
> I don't think this is related to debugserver codesigning. If you really
> need to debug system binaries, you may need to disable SIP.
>
> On 22/07/2019 16:14, Gábor Márton wrote:
>
> I am still struggling with this issue. Now I decided to work with the
> codesigned version of the debugserver, becasue I had an error when I tried
> to use the system debugserver.
> So I've run scripts/macos-setup-codesign.sh
> After a reboot and fresh build (I have removed the CMakeCache.txt and the
> whole build dir) I have the debugserver signed:
> ```
> $ codesign -dvvvv ~/llvm2/build/release_assert/bin/debugserver
> Executable=/Users/egbomrt/llvm2/build/release_assert/bin/debugserver
> Identifier=com.apple.debugserver
> Format=Mach-O thin (x86_64)
> CodeDirectory v=20100 size=38534 flags=0x0(none) hashes=1197+5
> location=embedded
> VersionPlatform=1
> VersionMin=658944
> VersionSDK=658944
> Hash type=sha256 size=32
> CandidateCDHash sha256=7b475cfa7127c84281ceb206093d13dd464dad74
> Hash choices=sha256
> Page size=4096
> CDHash=7b475cfa7127c84281ceb206093d13dd464dad74
> Signature size=1611
> Authority=lldb_codesign
> Signed Time=2019. Jul 22. 15:26:29
> Info.plist entries=6
> TeamIdentifier=not set
> Sealed Resources=none
> Internal requirements count=1 size=100
> $
> ```
>
> So far so good.
> But then when I try to use lldb I have permission problems:
> ```
> egbomrt at msmarple ~/llvm2/build/release_assert $ ./bin/lldb /bin/ls
> (lldb) target create "/bin/ls"
> Current executable set to '/bin/ls' (x86_64).
> (lldb) r
> *error: process exited with status -1 (Error 1)*
> (lldb) ^D
> egbomrt at msmarple ~/llvm2/build/release_assert $
> ```
>
> However, as root I can use lldb:
> ```
> egbomrt at msmarple ~/llvm2/build/release_assert $ sudo ./bin/lldb /bin/ls
> (lldb) target create "/bin/ls"
> Current executable set to '/bin/ls' (x86_64).
> (lldb) r
> Process 28052 launched: '/bin/ls' (x86_64)
> .ninja_deps                     compile_commands.json
> .ninja_log                      docs
> CMakeCache.txt                  examples
> CMakeDoxyfile.in                include
> ...
> Process 28052 exited with status = 0 (0x00000000)
> (lldb) ^D
> egbomrt at msmarple ~/llvm2/build/release_assert $
> ```
>
> Is it possible to codesign in a way that a regular user can run the built
> debugserver? Or what else could be the reason behind this permission
> problem?
>
> Thanks,
> Gabor
>
> On Fri, Jul 19, 2019 at 11:47 PM Stefan Gränitz <stefan.graenitz at gmail.com>
> wrote:
>
>> Hi Gábor, I am sorry this caused an issue for you. Good that apparently
>> it's resolved now.
>>
>> Did you reconfigure an existing build-tree? Your observations would make
>> sense in this context, because the change affects CMake cached variables.
>> This is unfortunate, but can not always be avoided. If this happens again
>> (or to anyone else), a clean build seems to be a good first step.
>>
>> Best,
>> Stefan
>>
>> On 19/07/2019 19:36, Gábor Márton wrote:
>>
>> Actually, it is embarrassing (perhaps for macOS and not for me) that
>> after a reboot the problem is gone.
>> Perhaps after "sudo /usr/sbin/DevToolsSecurity --enable" a reboot is
>> required, but could not find anything official about that.
>>
>> On Fri, Jul 19, 2019 at 7:20 PM Gábor Márton <martongabesz at gmail.com>
>> wrote:
>>
>>> This might not be related to the debugserver, I just realized that I
>>> get
>>> "error: process exited with status -1 (Error 1)"
>>> even with the simplest main.c.
>>> This may be some kind of security issue on mac OS...
>>> Though I've checked and I have SIP disabled and I have executed "sudo
>>> /usr/sbin/DevToolsSecurity --enable".
>>>
>>> On Fri, Jul 19, 2019 at 4:46 PM Gábor Márton <martongabesz at gmail.com>
>>> wrote:
>>>
>>>> Hi Stefan,
>>>>
>>>> Since the commit
>>>> "[CMake] Always build debugserver on Darwin and allow tests to use the
>>>> system's one"
>>>> I cannot use the system debugserver for testing.
>>>> I receive the following error message from lldb when I execute "ninja
>>>> check-lldb":
>>>> ```
>>>> runCmd: run
>>>> runCmd failed!
>>>> error: process exited with status -1 (Error 1)
>>>> ```
>>>>
>>>> I do set up "-DLLDB_USE_SYSTEM_DEBUGSERVER=ON" with cmake so I see
>>>> ```
>>>> -- LLDB tests use out-of-tree debugserver:
>>>> /Library/Developer/CommandLineTools/Library/PrivateFrameworks/LLDB.framework/Resources/debugserver
>>>> ```
>>>>
>>>> Also, I have inspected the following test output
>>>> ```
>>>> Command invoked: /usr/bin/python
>>>> /Users/egbomrt/llvm2/git/llvm/tools/lldb/test/dotest.py -q --arch=x86_64 -s
>>>> /Users/egbomrt/llvm2/build/release_assert/lldb-test-traces --build-dir
>>>> /Users/egbomrt/llvm2/build/release_assert/lldb-test-build.noindex -S nm -u
>>>> CXXFLAGS -u CFLAGS --executable
>>>> /Users/egbomrt/llvm2/build/release_assert/./bin/lldb --dsymutil
>>>> /Users/egbomrt/llvm2/build/release_assert/./bin/dsymutil --filecheck
>>>> /Users/egbomrt/llvm2/build/release_assert/./bin/FileCheck -C
>>>> /Users/egbomrt/llvm2/build/release_assert/bin/clang --codesign-identity -
>>>> --out-of-tree-debugserver --arch x86_64 -t --env TERM=vt100 -p
>>>> TestCModules.py --results-port 49931 -S nm --inferior -p TestCModules.py
>>>> /Users/egbomrt/llvm2/git/llvm/tools/lldb/packages/Python/lldbsuite/test/lang/c/modules
>>>> --event-add-entries worker_index=0:int
>>>>   1 out of 736 test suites processed - TestCModules.py
>>>> ```
>>>> so it seems like the argument for --out-of-tree-debugserver is
>>>> missing...
>>>>
>>>> Could you please advise?
>>>>
>>>> Thank you,
>>>> Gabor
>>>>
>>> -- https://flowcrypt.com/pub/stefan.graenitz@gmail.com
>>
>> -- https://flowcrypt.com/pub/stefan.graenitz@gmail.com
>
>
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