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[Bug dynamic-link/21598] i386 _dl_runtime_resolve/_dl_runtime_profile is incompatible with shadow stack


https://sourceware.org/bugzilla/show_bug.cgi?id=21598

--- Comment #37 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
This is an automated email from the git hooks/post-receive script. It was
generated because a ref change was pushed to the repository containing
the project "GNU C Library master sources".

The branch, hjl/cet/property has been created
        at  e116af67abeb80c18ff2176a1197eb6fdd394d53 (commit)

- Log -----------------------------------------------------------------
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=e116af67abeb80c18ff2176a1197eb6fdd394d53

commit e116af67abeb80c18ff2176a1197eb6fdd394d53
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Mon Aug 14 12:31:49 2017 -0700

    Fix x86: Support IBT and SHSTK from Intel CET

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=fe6147c95512e3116028caa506625e54c09e1db9

commit fe6147c95512e3116028caa506625e54c09e1db9
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Wed Jun 28 15:16:46 2017 -0700

    i386: Add _dl_runtime_resolve_shstk/_dl_runtime_profile_shstk [BZ #21598]

    Add SHSTK compatible symbol resolvers to support Shadow Stack in Intel
    Control-flow Enforcement Technology (CET) instructions:

   
https://software.intel.com/sites/default/files/managed/4d/2a/control-flow-enforcement-technology-preview.pdf

    Replace _dl_runtime_resolve and _dl_runtime_profile with
    _dl_runtime_resolve_shstk and _dl_runtime_profile_shstk, respectively if
    SHSTK is enabled.

         [BZ #21598]
         * sysdeps/i386/dl-trampoline.S (_dl_runtime_resolve_shstk): New.
         (_dl_runtime_profile_shstk): Likewise.
         * sysdeps/unix/sysv/linux/i386/dl-cet.c: New file.

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=d2a41895661dcb974c19d6f8b92be3a5a5f2f755

commit d2a41895661dcb974c19d6f8b92be3a5a5f2f755
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Thu Jun 22 04:15:39 2017 -0700

    x86: Support IBT and SHSTK from Intel CET

    Intel Control-flow Enforcement Technology (CET) instructions:

   
https://software.intel.com/sites/default/files/managed/4d/2a/control-flow-en
    forcement-technology-preview.pdf

    includes Indirect Branch Tracking (IBT) and Shadow Stack (SHSTK).

    GNU_PROPERTY_X86_FEATURE_1_IBT is added to GNU program property to
    indicate that all executable sections are compatible with IBT when
    ENDBR instruction starts each valid target where an indirect branch
    instruction can land.  GNU_PROPERTY_X86_FEATURE_1_IBT is set on output
    only if it is set on all relocatable inputs.

    On an IBT capable processor, the following steps should be taken:

    1. When loading an executable, if GNU_PROPERTY_X86_FEATURE_1_IBT is
    set on the executable, enable IBT.
    2. If IBT is enabled, when loading a shared object without
    GNU_PROPERTY_X86_FEATURE_1_IBT:
      a. If legacy interwork is allowed, then mark all pages in executable
         PT_LOAD segments in legacy code page bitmap.  Failure of legacy code
         page bitmap allocation causes an error.
      b. If legacy interwork isn't allowed, it causes an error.

    GNU_PROPERTY_X86_FEATURE_1_SHSTK is added to GNU program property to
    indicate that all executable sections are compatible with SHSTK where
    return address popped from shadow stack always matches return address
    popped from normal stack.  GNU_PROPERTY_X86_FEATURE_1_SHSTK is set on
    output only if it is set on all relocatable inputs.

    On a SHSTK capable processor, the following steps should be taken:

    1. When loading an executable, if GNU_PROPERTY_X86_FEATURE_1_SHSTK is
    set on the executable as well as all shared objects loaded via the
    DT_NEEDED tag, enable SHSTK.
    2. After SHSTK is enabled, it is an error to load a shared object
    without GNU_PROPERTY_X86_FEATURE_1_SHSTK.

    When glibc is built with a compiler which defines defines __IBT__ and
    __SHSTK__, CET is enabled, unless --disable-cet is used to configure
    glibc.  When CET is enabled, both compiler and assembler must support
    CET.  Otherwise, it is a configure-time error.

    To support CET run-time control,

    1. _dl_x86_feature_1 is added to the writable ld.so namespace to indicate
    if IBT or SHSTK are enabled at run-time.
    2. For dynamic executables:
       a. A l_cet field is added to struct link_map to indicate if IBT or
          SHSTK is enabled in an ELF module.  The optional DL_PROCESS_PT_NOTE
          is called to process PT_NOTE segment for GNU program property and
          set l_cet.
       b. _dl_start_user calls _dl_cet_init, instead of _dl_init, which sets
         _dl_x86_feature_1 as well as sets up IBT and SHSTK.
    3. For static executables, _dl_setup_cet is called to process PT_NOTE
    segment for GNU program property to set _dl_x86_feature_1 as well as set
    up IBT and SHSTK.

    <cet.h> from CET-enabled GCC is automatically included by assembly codes
    to add GNU_PROPERTY_X86_FEATURE_1_IBT and GNU_PROPERTY_X86_FEATURE_1_SHSTK
    to GNU program property if __IBT__ or __SHSTK__ is defined.

        * config.h.in (ENABLE_CET): New #undef.
        * configure.ac: Add --enable-cet.
        * configure: Regenerated.
        * elf/dl-load.c (filebuf): Moved before "dynamic-link.h".
        (_dl_map_object_from_fd): Call DL_PROCESS_PT_NOTE on PT_NOTE
        segment if DL_PROCESS_PT_NOTE is defined.
        * elf/rtld.c (dl_main): Likewise.
        * elf/dl-support.c: Include <dl-procruntime.c>.
        * include/link.h: Include <link_map.h>.
        * sysdeps/generic/dl-procruntime.c: New file.
        * sysdeps/generic/link_map.h: Likewise.
        * sysdeps/unix/sysv/linux/i386/dl-machine.h: Likewise.
        * sysdeps/unix/sysv/linux/x86/configure: Likewise.
        * sysdeps/unix/sysv/linux/x86/configure.ac: Likewise.
        * sysdeps/unix/sysv/linux/x86/dl-cet-nonshared.c: Likewise.
        * sysdeps/unix/sysv/linux/x86/dl-cet.c: Likewise.
        * sysdeps/unix/sysv/linux/x86/dl-cet.h: Likewise.
        * sysdeps/unix/sysv/linux/x86/dl-procruntime.c: Likewise.
        * sysdeps/unix/sysv/linux/x86/libc-start.c: Likewise.
        * sysdeps/unix/sysv/linux/x86/link_map.h: Likewise.
        * sysdeps/unix/sysv/linux/x86_64/dl-machine.h: Likewise.
        * sysdeps/generic/ldsodefs.h: Include <dl-procruntime.c> in
        the writable ld.so namespace.
        * sysdeps/i386/dl-machine.h (DL_INIT): New.
        (_dl_start_user): Replace _dl_init with DL_INIT.
        * sysdeps/unix/sysv/linux/x86/Makefile (sysdep_routines): Add
        dl-cet-nonshared if CET is enabled.
        (sysdep-dl-routines): Add dl-cet if CET is enabled.
        (asm-CPPFLAGS): Include cet.h if CET is enabled.
        * sysdeps/x86/libc-start.c (ARCH_INIT_CPU_FEATURES): Define
        only if it is undefined.
        * sysdeps/x86_64/dl-machine.h (DL_INIT): New.
        (_dl_start_user): Replace _dl_init with DL_INIT.

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=d03b77eb6e76d97aac7ce3ba53f1c5aea4c6fd0b

commit d03b77eb6e76d97aac7ce3ba53f1c5aea4c6fd0b
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Wed Jun 21 13:07:05 2017 -0700

    Add NT_GNU_PROPERTY_TYPE_0 macros

    Add macros used in GNU .note.gnu.property notes (NT_GNU_PROPERTY_TYPE_0).

        * elf/elf.h (NT_GNU_PROPERTY_TYPE_0): New.
        (NOTE_GNU_PROPERTY_SECTION_NAME): Likewise.
        (GNU_PROPERTY_STACK_SIZE): Likewie.
        (GNU_PROPERTY_NO_COPY_ON_PROTECTED): Likewie.
        (GNU_PROPERTY_LOPROC): Likewise.
        (GNU_PROPERTY_HIPROC): Likewise.
        (GNU_PROPERTY_LOUSER): Likewise.
        (GNU_PROPERTY_HIUSER): Likewise.
        (GNU_PROPERTY_X86_ISA_1_USED): Likwise.
        (GNU_PROPERTY_X86_ISA_1_NEEDED): Likwise.
        (GNU_PROPERTY_X86_FEATURE_1_AND): Likwise.
        (GNU_PROPERTY_X86_ISA_1_486): Likwise.
        (GNU_PROPERTY_X86_ISA_1_586): Likwise.
        (GNU_PROPERTY_X86_ISA_1_686): Likwise.
        (GNU_PROPERTY_X86_ISA_1_SSE): Likwise.
        (GNU_PROPERTY_X86_ISA_1_SSE2): Likwise.
        (GNU_PROPERTY_X86_ISA_1_SSE3): Likwise.
        (GNU_PROPERTY_X86_ISA_1_SSSE3): Likwise.
        (GNU_PROPERTY_X86_ISA_1_SSE4_1): Likwise.
        (GNU_PROPERTY_X86_ISA_1_SSE4_2): Likwise.
        (GNU_PROPERTY_X86_ISA_1_AVX): Likwise.
        (GNU_PROPERTY_X86_ISA_1_AVX2): Likwise.
        (GNU_PROPERTY_X86_ISA_1_AVX512F): Likwise.
        (GNU_PROPERTY_X86_ISA_1_AVX512CD): Likwise.
        (GNU_PROPERTY_X86_ISA_1_AVX512ER): Likwise.
        (GNU_PROPERTY_X86_ISA_1_AVX512PF): Likwise.
        (GNU_PROPERTY_X86_ISA_1_AVX512VL): Likwise.
        (GNU_PROPERTY_X86_ISA_1_AVX512DQ): Likwise.
        (GNU_PROPERTY_X86_ISA_1_AVX512BW): Likwise.
        (GNU_PROPERTY_X86_FEATURE_1_IBT): Likwise.
        (GNU_PROPERTY_X86_FEATURE_1_SHSTK): Likwise.

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

--- Comment #38 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
This is an automated email from the git hooks/post-receive script. It was
generated because a ref change was pushed to the repository containing
the project "GNU C Library master sources".

The branch, hjl/cet/property has been deleted
       was  7cd333874be8923a26de570813f176ca0ea252fb

- Log -----------------------------------------------------------------
7cd333874be8923a26de570813f176ca0ea252fb i386: Add
_dl_runtime_resolve_shstk/_dl_runtime_profile_shstk [BZ #21598]
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