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

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

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=c45d78aac47db08bc8ea7641c5330cccaecd3ddb

commit c45d78aac47db08bc8ea7641c5330cccaecd3ddb
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date:   Wed Nov 22 18:02:20 2017 -0200

    posix: Fix generic p{read,write}v buffer allocation (BZ#22457)

    As described in BZ#22457 an interpose malloc can free an invalid
    pointer for fallback preadv implementation.  Fortunately this is
    just and issue on microblaze-linux-gnu running kernels older than
    3.15.  This patch fixes it by calling mmap/unmap instead of
    posix_memalign/ free.

    Checked on microblaze-linux-gnu check with run-built-tests=no and
    by using the sysdeps/posix implementation on x86_64-linux-gnu (just
    for sanity test where it shown no regression).

        [BZ #22457]
        * sysdeps/posix/preadv_common.c (PREADV): Use mmap/munmap instead of
        posix_memalign/free.
        * sysdeps/posix/pwritev_common.c (PWRITEV): Likewise.

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog                      |    7 +++++++
 sysdeps/posix/preadv_common.c  |    8 +++++---
 sysdeps/posix/pwritev_common.c |    8 +++++---
 3 files changed, 17 insertions(+), 6 deletions(-)

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