[Bug libc/29770] New: prctl does not match manual page ABI on powerpc64le-linux-gnu

["fweimer at redhat dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=29770

            Bug ID: 29770
           Summary: prctl does not match manual page ABI on
                    powerpc64le-linux-gnu
           Product: glibc
           Version: unspecified
            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: ---
            Target: powerpc64le-linux-gnu
             Flags: security-

On powerpc64le-linux-gnu, since

commit ff026950e280bc3e9487b41b460fb31bc5b57721
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Thu Apr 30 10:42:43 2020 -0700

    Add a C wrapper for prctl [BZ #25896]

    Add a C wrapper to pass arguments in

    /* Control process execution.  */
    extern int prctl (int __option, ...) __THROW;

    to prctl syscall:

    extern int prctl (int, unsigned long int, unsigned long int,
                      unsigned long int, unsigned long int);

the glibc ABI no longer matches what is documented in the manual page, which
mentions the second prototype only. Calls through the non-variadic prototype do
not set up a parameter save area, and use of the area by the glibc
implementation corrupts the stack in the caller.

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