[Bug malloc/17730] thread-local storage is sometimes improperly free()'d after being __libc_memalign()'d

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https://sourceware.org/bugzilla/show_bug.cgi?id=17730

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=a0d47f487fe250c63cc21e9608b85bc02dc2a006

commit a0d47f487fe250c63cc21e9608b85bc02dc2a006
Author: Stefan Liebler <stli@linux.vnet.ibm.com>
Date:   Tue Sep 6 14:44:15 2016 +0200

    S390: Support PLT and GOT references in check-localplt.

    on s390x the test elf/check-localplt is failing after recent commits:
    "elf: Do not use memalign for TCB/TLS blocks allocation [BZ #17730]"
    "elf: Avoid using memalign for TLS allocations [BZ #17730]"
    "elf: dl-minimal malloc needs to respect fundamental alignment"
    due to "Missing required PLT reference: ld.so: __libc_memalign".

    After the commits __libc_memalign is only called in elf/dl-minimal.c in
    malloc() function in ld.so and gcc -O2/-O3 leads to R_390_GLOB_DAT
    instead of R_390_JMP_SLOT. __libc_memalign is called via
    function-pointer loaded from GOT instead of calling via a plt-stub. In
    this case there is the R_390_GLOB_DAT relocation in section .rela.dyn
    instead of R_390_JMP_SLOT in .rela.plt.
    This patch marks ld.so: __libc_memalign with R_390_GLOB_DAT in
    localplt.data to allow both relocations.
    If build with -fno-optimize-sibling-calls or on s390(31bit) a
    R_390_JMP_SLOT is generated.

    ChangeLog:

        * sysdeps/unix/sysv/linux/s390/localplt.data: Mark
        ld.so: __libc_memalign with "+ RELA R_390_GLOB_DAT".

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

Summary of changes:
 ChangeLog                                  |    5 +++++
 sysdeps/unix/sysv/linux/s390/localplt.data |    9 ++++++++-
 2 files changed, 13 insertions(+), 1 deletions(-)

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