[Bug runtime/10381] New: sdt.h macros create relocatable addresses in non-writable allocated .probes section

[mjw at redhat dot com]

This causes selinux memory protection failures:

SELinux is preventing uprobesgcc-O0de from loading
/usr/local/build/systemtap-obj/testsuite/libuprobeslibgcc-O0default-debug.so
which requires text relocation.

Which look like:

./myexe: error while loading shared libraries: libmylib.so: cannot open shared
object file: No such file or directory

Where mylib.c just has the innocent looking:

STAP_PROBE1(test, lib_main, 1);

This seems to be caused by the fact that we are taking the address of the
generated label (&&label) and store that in the .probes section. Which seem to
result in R_X86_64_RELATIVE relocations in the .probes section, which is
insegment 0 which is LOADed with just R E, not W.

-- 
           Summary: sdt.h macros create relocatable addresses in non-
                    writable allocated .probes section
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: runtime
        AssignedTo: systemtap at sources dot redhat dot com
        ReportedBy: mjw at redhat dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=10381

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