[Bug runtime/29076] New: user_string_quoted() doesn't properly generate strings in .rodata on x86_64 machines

["wcohen at redhat dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=29076

            Bug ID: 29076
           Summary: user_string_quoted() doesn't properly generate strings
                    in .rodata on x86_64 machines
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: runtime
          Assignee: systemtap at sourceware dot org
          Reporter: wcohen at redhat dot com
  Target Milestone: ---

Created attachment 14073
  --> https://sourceware.org/bugzilla/attachment.cgi?id=14073&action=edit
User-space and systemtap script showing issue with .rodata strings

When triaging the testsuite systemtap.syscall/syscall.exp failures I found that
strings that were stored in the .rodata section were not properly printed on
x86_64 fedora 35 machine.  In their place was the pointer value passed in for
the string location.

Have a little example demonstrating the issue in x86_ro_string.tar.gz:
$ uname -a
Linux fedora 5.16.20-200.fc35.x86_64 #1 SMP PREEMPT Wed Apr 13 22:09:20 UTC
2022 x86_64 x86_64 x86_64 GNU/Linux
$ gcc -o acct2 -O2 acct2.c
$ sudo stap -c ./acct2 sys_acct.stp 
[sudo] password for wcohen: 
kprobe.function("__x64_sys_acct")?(0x402010)
kprobe.function("__x64_sys_acct")?("foobar")
kprobe.function("__x64_sys_acct")?(0xffffffffffffffff)

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