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[Bug libc/21752] New: __stack_chk_fail should do as little work as possible


https://sourceware.org/bugzilla/show_bug.cgi?id=21752

            Bug ID: 21752
           Summary: __stack_chk_fail should do as little work as possible
           Product: glibc
           Version: 2.26
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: fweimer at redhat dot com
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---
             Flags: security+

The fix for bug 12189 only removed the backtrace.  We still flush the stdio
streams, which can actually perform indirect function calls.  There might be
other things we should remove.  We should not call anything but write(v),
sigaction/sginal, getpid and kill.

Tagging security+ in accordance with bug 12189.

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