[Bug libc/22457] New: Generic preadv/pwritev incorrectly calls __posix_memalign

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=22457

            Bug ID: 22457
           Summary: Generic preadv/pwritev incorrectly calls
                    __posix_memalign
           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: ---
            Target: Hurd

An interposed malloc will not override __posix_memalign, so these functions
free an invalid pointer.

This is not a problem on Linux because the system calls are always used.

My advice would be to replace these functions with an ENOSYS stub until Hurd
implements them.

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