Any restriction on Mac that binaries running from root dirs like /usr/libexec/ cannot load dylib's at run-time?
Hi all,
Is there any restriction on Mac OS X 10.6/10.7 that binaries running from root directories like /usr/libexec/ cannot load dylib's at run-time using dlopen() or NSAddImage()?
I am trying to run a binary like "sample" from a directory inside /usr/libexec/ which tries to load a dylib like "sample.dylib" which is present in the same directory as "sample".
It resulted in a segmentation fault with the following error and stack-trace.
Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: KERN_INVALID_ADDRESS at address: 0x0000000000003430
0x0000000000003430 in ?? ()
Using gdb, I could find out that the program crashed inside dlopen() (the path passed to dlopen() being a simple filename like "sample.dylib").
The dlopen() at the top of the stack-trace pasted below gets called around 10 times; it does not crash during this 2nd level dlopen() any-time.
#0 0x00007fff81be9e93 in dlopen ()
#1 0x00007fff82838f7f in map_images_nolock ()
#2 0x00007fff82821bc0 in map_images ()
#3 0x00007fff5fc039b9 in __dyld__ZN4dyldL18notifyBatchPartialE17dyld_image_statesbPFPKcS0_jPK15dyld_imag e_infoE ()
#4 0x00007fff5fc0c839 in __dyld__ZN11ImageLoader4linkERKNS_11LinkContextEbbRKNS_10RPathChainE ()
#5 0x00007fff5fc04d48 in __dyld__ZN4dyld4linkEP11ImageLoaderbRKNS0_10RPathChainE ()
#6 0x00007fff5fc08f68 in __dyld_dlopen ()
#7 0x00007fff81be9ec0 in dlopen ()
#8 0x000000010002694f in AAA ()
#9 0x0000000100026730 in XXX ()
#10 0x0000000100026494 in YYY ()
#15 0x00000001000566a9 in main (argc=7, argv=0x7fff5fbff810) at ../../main.c:50
After this 2nd level dlopen() gets called 10-15 times, the stack will unwind from map_images_nolock () till __dyld_dlopen (). But when it tries to finish all the instructions inside __dyld_dlopen () and step out of it, the program crashes with the EXC_BAD_ACCESS signal.
Please find below the final stack-traces obtained during debugging when I put breakpoints for AAA() and dlopen() and went on stepping inside till the program crashed.
(gdb) bt
#0 0x00007fff5fc04d48 in __dyld__ZN4dyld4linkEP11ImageLoaderbRKNS0_10RPathChainE ()
#1 0x00007fff5fc08f68 in __dyld_dlopen ()
#2 0x00007fff81be9ec0 in dlopen ()
#3 0x000000010002694f in AAA ()
#4 0x0000000100026730 in XXX ()
#5 0x000000010002663c in YYY ()
#11 0x00000001000566a9 in main (argc=7, argv=0x7fff5fbff7f0) at main.c:50
(gdb) step
Single stepping until exit from function __dyld__ZN4dyld4linkEP11ImageLoaderbRKNS0_10RPathChainE,
which has no line number information.
0x00007fff5fc08f68 in __dyld_dlopen ()
(gdb) bt
#0 0x00007fff5fc08f68 in __dyld_dlopen ()
#1 0x00007fff81be9ec0 in dlopen ()
#2 0x000000010002694f in AAA ()
#3 0x0000000100026730 in XXX ()
#4 0x000000010002663c in YYY ()
#10 0x00000001000566a9 in main (argc=7, argv=0x7fff5fbff7f0) at ../../main.c:50
(gdb) step
Single stepping until exit from function __dyld_dlopen,
which has no line number information.
Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: KERN_INVALID_ADDRESS at address: 0x0000000000003430
0x0000000000003430 in ?? ()
To summarise:
For some reason, a user wants to install a product and its binaries under /usr/libexec/.
This binary tries to dynamically load a dylib using dlopen("sample.dylib", RTLD_LAZY | RTLD_LOCAL).
It looks like, the dynamic linker then opens dependent dylibs and runs module initialisers. Then crashes when returning (which sounds like a trashed stack).
Can anyone please tell me whether there is some OS-imposed restriction or OS bug which can explain this type of behaviour?
(Note: The crash does not occur if the binary and dylib are installed under a normal user's home directory and run from there.)
Many thanks,
Vinay
The otool output for the binary and dylib are pasted below.
localhost:Latest dev$ otool -L /usr/libexec/Dipu/sample/sample
/usr/libexec/Dipu/sample/sample:
/System/Library/Frameworks/IOKit.framework/Versions/A/IOKit (compatibility version 1.0.0, current version 275.0.0)
/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation (compatibility version 150.0.0, current version 476.18.0)
/usr/lib/libstdc++.6.dylib (compatibility version 7.0.0, current version 7.4.0)
/usr/lib/libgcc_s.1.dylib (compatibility version 1.0.0, current version 1.0.0)
/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 111.1.4)
localhost:Latest dev$ otool -L /usr/libexec/Dipu/sample/sample.dylib
/usr/libexec/Dipu/sample/sample.dylib:
libProduct.dylib (compatibility version 1.0.0, current version 1.0.0)
/System/Library/Frameworks/Carbon.framework/Versions/A/Carbon (compatibility version 2.0.0, current version 136.0.0)
/System/Library/Frameworks/IOKit.framework/Versions/A/IOKit (compatibility version 1.0.0, current version 275.0.0)
/usr/lib/libstdc++.6.dylib (compatibility version 7.0.0, current version 7.4.0)
/usr/lib/libgcc_s.1.dylib (compatibility version 1.0.0, current version 1.0.0)
/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 111.1.4)
/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation (compatibility version 150.0.0, current version 476.18.0)
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