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From: "wcohen at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: systemtap@sourceware.org
Subject: [Bug runtime/29076] user_string_quoted() doesn't properly generate
 strings in .rodata on x86_64 machines
Date: Wed, 20 Apr 2022 18:17:05 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29076

--- Comment #5 from William Cohen <wcohen at redhat dot com> ---
The mlockall allows the access to the string in the readonly section.

[wcohen@fedora x86_ro_string]$ cat acct6.c
#include <unistd.h>
#include <string.h>
#include <sys/mman.h>

char *a=3D"foobar";
char buffer[32];

int main()
{
  mlockall(MCL_CURRENT);
  acct(a);
  strcpy (&buffer[0], a);
  acct(&buffer[0]);
  acct((char *)-1);
  return 0;
}
[wcohen@fedora x86_ro_string]$ gcc -o acct6 -O2 acct6.c
[wcohen@fedora x86_ro_string]$ sudo stap -c ./acct6 sys_acct.stp=20
kprobe.function("__x64_sys_acct")?("foobar")
kprobe.function("__x64_sys_acct")?("foobar")
kprobe.function("__x64_sys_acct")?(0xffffffffffffffff)

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