[Qemu-devel] [Bug 1299190] Re: Access to /proc/self/exe in linux-user mode

[Peter Maydell]

Some nits:
 The "(CPUArchState *)" cast isn't necessary
 We should use exec_path, not ts->bprm->argv[0] (the guest argv[0] isn't 
necessarily the executable path)
 We don't want to call path() here -- exec_path is a host path, and only guest 
filename paths need to go through path().

Looking a little more closely at the logic in main.c I wonder if we
actually want:

   if (is_proc_myself(pathname, "exe")) {
        execfd = qemu_getauxval(AT_EXECFD);
        if (execfd) {
             return execfd;
        }
        return get_errno(open(exec_path, flags, mode));
    }

Also if you'd like us to apply your patches we'll need at least a
"Signed-off-by: " line from you.

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https://bugs.launchpad.net/bugs/1299190

Title:
  Access to /proc/self/exe in linux-user mode

Status in QEMU:
  New

Bug description:
  This is based on a recent bug in GCC Bugzilla:
  http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60681

  It looks like libbacktrace (GCC runtime library used for obtaining
  stack traces) uses /proc/self/exe for error reporting. Currently this
  is mapped to qemu-arm which effectively disables libbacktrace on
  linux-user.

  It seems that QEMU already supports /proc/self/{maps,stat,auxv} so
  addition of /proc/self/exe may be trivial.

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