[Bug server/17056] New: gdbserver assumes 32-bit binary if /proc/PID/exe can't be read

["qartis at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=17056

            Bug ID: 17056
           Summary: gdbserver assumes 32-bit binary if /proc/PID/exe can't
                    be read
           Product: gdb
           Version: 7.7
            Status: NEW
          Severity: normal
          Priority: P2
         Component: server
          Assignee: unassigned at sourceware dot org
          Reporter: qartis at gmail dot com

Under some circuimstances, executables packed with UPX (prior to version 3.05)
may have an invalid /proc/PID/exe link, which causes gdbserver to assume the
executable is 32-bit. This only happens when gdbserver is attaching to an
existing (64-bit) process -- gdbserver reports the correct target architecture
if it spawns the executable itself.

(gdb) target remote 1.2.3.4:1337
warning: Selected architecture i386:x86-64 is not compatible with reported
target architecture i386

A temporary workaround is to add the following at the top of
linux_pid_exe_is_elf_64_file(), which forces gdbserver to assume the process is
64-bit:

    *machine = EM_X86_64;
    return 1;

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