Sean,
Thanks for the tip.
This lends credence to my suspicion that the change in behavior came in
snv83 with the direct bindings change, which also changed most
libraries to lazyload. As a result, most libraries are now not yet
loaded when dtrace does its initial probe scan, and hence the
descriptions for libraries will now usually fail.
Perhaps the description of the -Z flag should note its particular
value for plugins and lazyloaded libraries.
-JZ
> From [EMAIL PROTECTED] Tue May 20 16:11:30 2008
>
> John Zolnowsky x69422/408-404-5064 stated:
> < In investigating a hang in kcfd, I wanted to find the call path to
> < libxml2's xmlInitParser() routine. So, under snv89, I invoked dtrace:
> <
> < # dtrace -n 'pid$target::xmlInitParser:entry { ustack(); }' \
> < -c 'elfsign verify -v /usr/lib/security/pkcs11_kernel.so.1'
> < dtrace: invalid probe specifier pid$target::xmlInitParser:entry { ustack();
> }: probe description pid2794::xmlInitParser:entry does not match any probes
> < elfsign: verification of /usr/lib/security/pkcs11_kernel.so.1 passed.
> < ...
> <
> < Specifying the libxml2.so.2 module doesn't help. Removing the function
> < name altogether does result in a probe at libxml2.so.2`xmlInitParser,
> < but I have to search through an exhaustive list of all function calls.
> < How do I narrow my probe specification?
>
> Adding the -Z flag may help.
> dtrace(1M): 'Permit probe descriptions that match zero probes.'
>
> Without -Z, same error as you.
>
> $ dtrace -n 'pid$target::xmlInitParser:entry { ustack(); }' -c 'elfsign
> verify -v /usr/lib/security/pkcs11_kernel.so.1 '
> dtrace: invalid probe specifier pid$target::xmlInitParser:entry { ustack();
> }: probe description pid3654::xmlInitParser:entry does not match any probes
> elfsign: verification of /usr/lib/security/pkcs11_kernel.so.1 passed.
> format: rsa_sha1.
> signer: O=Sun Microsystems Inc, OU=Solaris Cryptographic Framework, CN=SunOS
> 5.10.
> signed on: Tue Apr 29 10:25:51 2008.
>
> With -Z the probe fires, even though matched 0 probes.
>
> $ dtrace -Z -n 'pid$target::xmlInitParser:entry { ustack(); }' -c 'elfsign
> verify -v /usr/lib/security/pkcs11_kernel.so.1 '
> dtrace: description 'pid$target::xmlInitParser:entry ' matched 0 probes
> elfsign: verification of /usr/lib/security/pkcs11_kernel.so.1 passed.
> format: rsa_sha1.
> signer: O=Sun Microsystems Inc, OU=Solaris Cryptographic Framework, CN=SunOS
> 5.10.
> signed on: Tue Apr 29 10:25:51 2008.
> dtrace: pid 3656 has exited
> CPU ID FUNCTION:NAME
> 0 79006 xmlInitParser:entry
> libxml2.so.2`xmlInitParser
> libxml2.so.2`xmlParseDocument+0x1c
> libxml2.so.2`xmlDoRead+0x6b
> libxml2.so.2`xmlCtxtReadFile+0x55
> libkmf.so.1`kmf_get_policy+0x63
> libkmf.so.1`kmf_set_policy+0x6a
> libkmf.so.1`kmf_initialize+0xf1
> libkmf.so.1`KMF_Initialize+0x21
> libelfsign.so.1`elfcertlib_init+0x2f
> libelfsign.so.1`elfsign_begin+0xac
> elfsign`getelfobj+0x22
> elfsign`do_verify+0x20
> elfsign`main+0x568
> elfsign`_start+0x7a
>
>
>
>
> <
> < Thanks -JZ
> < _______________________________________________
> < dtrace-discuss mailing list
> < [email protected]
>
> --
> Sean.
> .
>
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