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Message-ID: Date: Mon, 14 Jan 2019 13:38:19 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.2.1 MIME-Version: 1.0 Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="------------ms050207060301000502010706" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This is a cryptographically signed message in MIME format. --------------ms050207060301000502010706 Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: de-DE Content-Transfer-Encoding: quoted-printable Hi, I've been playing around with uprobes today and found the following weird= =20 behaviour/output when using more than one string argument (or using the $= comm=20 argument). This was run on a v4.20 mainline build on Ubuntu 18.04. root@ubuntu1810:~# uname -a Linux ubuntu1810 4.20.0-042000-generic #201812232030 SMP Mon Dec 24 01:32= :58 UTC=20 2018 x86_64 x86_64 x86_64 GNU/Linux I'm trying to track calls to dlopen so I'm looking up the correct offset = in=20 libdl.so: root@ubuntu1810:/sys/kernel/debug/tracing# readelf -s=20 /lib/x86_64-linux-gnu/libdl-2.28.so | grep dlopen 34: 00000000000012a0 133 FUNC GLOBAL DEFAULT 14 dlopen@@GLIBC= _2.2.5 Then I'm creating a uprobe with two prints of $comm and two prints of the= first=20 argument to dlopen, and enable that probe. The '/root/test' program only = does a=20 dlopen("libc.so.6", RTLD_LAZY) in main(). root@ubuntu1810:/sys/kernel/debug/tracing# echo 'p:dlopen=20 /lib/x86_64-linux-gnu/libdl-2.28.so:0x12a0 $comm $comm +0(%di):string=20 +0(%di):string' > uprobe_events root@ubuntu1810:/sys/kernel/debug/tracing# echo 1 > events/uprobes/dlopen= /enable root@ubuntu1810:/sys/kernel/debug/tracing# /root/test The trace output looks like this: root@ubuntu1810:/sys/kernel/debug/tracing# cat trace # tracer: nop # # _-----=3D> irqs-off # / _----=3D> need-resched # | / _---=3D> hardirq/softirq # || / _--=3D> preempt-depth # ||| / delay # TASK-PID CPU# |||| TIMESTAMP FUNCTION # | | | |||| | | test-1617 [000] d... 1237.959168: dlopen: (0x7fbd5272e2a0)= =20 arg1=3D(fault) arg2=3D(fault) arg3=3D"libc.so.6libc.so.6" arg4=3D"libc.so= =2E6" That's very weird for two reasons: - fetching $comm seems to fail with an invalid pointer - arg3 contains the text twice (if I add another print of the argument, a= rg3=20 will contain the wanted string three times, arg4 two times and the last a= rgument=20 will contain it once). On the "standard" kernel shipped with Ubuntu 18.04 (4.18) printing $comm = works=20 but also "accumulates" (in lack of a better word) the later string argume= nts in=20 the earlier output arguments, so for the probe above arg1 would be=20 "testtestlibc.so.6libc.so.6", arg2 would be "testlibc.so.6libc.so.6" and = arg3/arg4 will be the same as in the output above. Is there anything in the documentation why multiple string outputs might = not=20 work with uprobes? Am I installing the uprobe wrong? Or is this a bug? I found that the kprobe selftest at=20 tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_string.tc contai= ns a=20 similar situation for kprobes (it prints the parameter two times) which w= orks=20 fine on the same system. Regards, Andreas --------------ms050207060301000502010706 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCC ELswggTVMIIDvaADAgECAghQTsb1PRG0ZDANBgkqhkiG9w0BAQsFADBxMQswCQYDVQQGEwJE RTEcMBoGA1UEChMTRGV1dHNjaGUgVGVsZWtvbSBBRzEfMB0GA1UECxMWVC1UZWxlU2VjIFRy dXN0IENlbnRlcjEjMCEGA1UEAxMaRGV1dHNjaGUgVGVsZWtvbSBSb290IENBIDIwHhcNMTQw NzIyMTIwODI2WhcNMTkwNzA5MjM1OTAwWjBaMQswCQYDVQQGEwJERTETMBEGA1UEChMKREZO LVZlcmVpbjEQMA4GA1UECxMHREZOLVBLSTEkMCIGA1UEAxMbREZOLVZlcmVpbiBQQ0EgR2xv YmFsIC0gRzAxMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA6ZvDZ4X5Da71jVTD llA1PWLpbkztlNcAW5UidNQg6zSP1uzAMQQLmYHiphTSUqAoI4SLdIkEXlvg4njBeMsWyyg1 OXstkEXQ7aAAeny/Sg4bAMOG6VwrMRF7DPOCJEOMHDiLamgAmu7cT3ir0sYTm3at7t4m6O8B r3QPwQmi9mvOvdPNFDBP9eXjpMhim4IaAycwDQJlYE3t0QkjKpY1WCfTdsZxtpAdxO3/NYZ9 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