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

[Peter Maydell]

That patch will copy the whole of the target executable into a temporary file 
without changing any of it -- the fake_open mechanism is really intended for 
cases where we need to return modified results. Wouldn't it be easier to just 
have something in do_open() that said:
    if (is_proc_myself(pathname, "exe")) {
        return get_errno(open(exec_path), flags, mode);
    }

That will then give the right behaviour for read-only executables and
other error-related corner cases.

(See also the logic in the readlink/readlinkat handling which already
specialcases /proc/self/exe using exec_path.)

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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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