[Bug string/21791] Unused XXX_chk_XXX functions in libc.a

Fri Jul 21 22:40:00 GMT 2017

https://sourceware.org/bugzilla/show_bug.cgi?id=21791

--- Comment #11 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
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The branch, hjl/pie/static has been created
        at  d15640b862315752553948dd0747f330e8e4fb20 (commit)

- Log -----------------------------------------------------------------
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=d15640b862315752553948dd0747f330e8e4fb20

commit d15640b862315752553948dd0747f330e8e4fb20
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Wed Jul 19 14:32:42 2017 -0700

    Add _startup_sbrk and _startup_fatal

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=26cb63887b68ef6908ff2ef324d9496b94b6eda9

commit 26cb63887b68ef6908ff2ef324d9496b94b6eda9
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Wed Jul 19 12:04:14 2017 -0700

    Don't compile tst-prelink.c with PIE for GLOB_DAT relocation

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=cc18e5bd3fb0ec9d57c5e01f4afcefc6cfd5ad90

commit cc18e5bd3fb0ec9d57c5e01f4afcefc6cfd5ad90
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Wed Jul 19 09:32:45 2017 -0700

    i386: Define I386_USE_SYSENTER to 0 or 1 and check PIC

    Define I386_USE_SYSENTER to 0 or 1 so that special versions of syscalls
    with "int $0x80" can be provided for static PIE during start up.  Also
    check PIC instead SHARED for PIC version of syscall macros.

        * sysdeps/unix/sysv/linux/i386/sysdep.h (I386_USE_SYSENTER):
        Define to I386_USE_SYSENTER to 0 or 1 if not defined.
        (ENTER_KERNEL): Check if I386_USE_SYSENTER is 1 and check PIC.
        (INTERNAL_SYSCALL_MAIN_INLINE): Likewise.
        (INTERNAL_SYSCALL_NCS): Likewise.
        (LOADARGS_1): Likewise.
        (LOADARGS_5): Likewise.
        (RESTOREARGS_1): Likewise.
        (RESTOREARGS_5): Likewise.

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=87d5af347432a1f5b2fe07e18debad5fc1abd242

commit 87d5af347432a1f5b2fe07e18debad5fc1abd242
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Tue Jul 18 15:46:40 2017 -0700

    i386: Check PIC in i386 multiarch functions

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=1b324811d28c0040f14b385d8df33110c77bc25d

commit 1b324811d28c0040f14b385d8df33110c77bc25d
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Tue Jul 18 15:45:46 2017 -0700

    i386: Check PIC instead of SHARED in start.S

    Support static PIE.  Avoid relocation in static PIE since _start is
    called before it is relocated.

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=615517445960b91da59d7c718e9e8fd99a8cb5b9

commit 615517445960b91da59d7c718e9e8fd99a8cb5b9
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Tue Jul 18 10:42:48 2017 -0700

    Use hidden visibility for ENABLE_STATIC_PIE

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=100f8148f0e45d79876140a55710626d1f7ec40b

commit 100f8148f0e45d79876140a55710626d1f7ec40b
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Mon Jul 17 13:53:52 2017 -0700

    Add _dl_relocate_static_pie

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=49504c83156f6a7989d441dabac1407e763e1ff1

commit 49504c83156f6a7989d441dabac1407e763e1ff1
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Mon Jul 17 08:54:40 2017 -0700

    Define pie-default/default-pie-ldflag for --enable-static-pie

    1. Add $(pie-default) to CFLAGS-.o and CFLAGS-.op.
    2. Add $(default-pie-ldflag) to +link-static-before-libc.
    3. Define +prectorT/+postctorT to $(+prectorS)/$(+postctorS).

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=4342bba858efd130376b183ad1774989a238a2ed

commit 4342bba858efd130376b183ad1774989a238a2ed
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Tue Jul 18 05:58:21 2017 -0700

    x86-64: Check if linker supports static PIE

    Need the linker with fix for:

    https://sourceware.org/bugzilla/show_bug.cgi?id=21782

    Binutils 2.29 is OK.

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=83f7cc148f98c27352104a1a87c53494330ec54d

commit 83f7cc148f98c27352104a1a87c53494330ec54d
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Mon Jul 17 08:36:45 2017 -0700

    Add --enable-static-pie

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=325274dfde1df977ed07b702723ac1281a6d24ed

commit 325274dfde1df977ed07b702723ac1281a6d24ed
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Fri Jul 21 05:07:19 2017 -0700

    Check if -static-pie works

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=3c2e79fcdca45a4051677f461507fe07df5872f7

commit 3c2e79fcdca45a4051677f461507fe07df5872f7
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Mon Jul 17 08:17:32 2017 -0700

    Check if linker supports --no-dynamic-linker

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=09f0835ca1ae46c9796c8e31fc59b8518281ef29

commit 09f0835ca1ae46c9796c8e31fc59b8518281ef29
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Tue Jul 18 05:23:21 2017 -0700

    x86-64: Check PIC instead of SHARED in start.S

    PIC may be the default.

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=f007d0b6e72d414bd2c66374bda9da46a24851ec

commit f007d0b6e72d414bd2c66374bda9da46a24851ec
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Tue Jul 18 15:36:20 2017 -0700

    x86: Remove assembly versions of HAS_CPU_FEATURE/HAS_ARCH_FEATURE

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=5467dc7f3efd1271bf33efe9d7e47d854e28c41d

commit 5467dc7f3efd1271bf33efe9d7e47d854e28c41d
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Wed Jul 19 06:54:03 2017 -0700

    i386: Convert IFUNC selectors to C

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=8cc2d3c298462ad2c574ac06001772210713f1b5

commit 8cc2d3c298462ad2c574ac06001772210713f1b5
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Tue Jul 18 15:35:30 2017 -0700

    x86-64: Convert libmathvec IFUNC selectors to C

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=be0774660ae0b6b71656b50beb7c49e8f14a6983

commit be0774660ae0b6b71656b50beb7c49e8f14a6983
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Tue Jul 18 13:56:17 2017 -0700

    x86-64: Convert libm IFUNC selectors to C

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=2bb19bfe62a2f0f2351c402f8aafcaef749a459a

commit 2bb19bfe62a2f0f2351c402f8aafcaef749a459a
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Wed Jul 19 08:46:08 2017 -0700

    i386: Don't define multiarch __memmove_chk in libc.a [BZ #21791]

    There is no need to define multiarch __memmove_chk in libc.a.

        [BZ #21791]
        * sysdeps/i386/i686/multiarch/memcpy-sse2-unaligned.S
        (MEMCPY_CHK): Define only if SHARED is defined.
        * sysdeps/i386/i686/multiarch/memcpy-ssse3-rep.S (MEMCPY_CHK):
        Likewise.
        * sysdeps/i386/i686/multiarch/memcpy-ssse3.S (MEMCPY_CHK):
        Likewise.

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=c274dbd83695c7f54bb0ed2214a58785591d8ad1

commit c274dbd83695c7f54bb0ed2214a58785591d8ad1
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Wed Jul 19 10:56:19 2017 -0700

    Avoid accessing corrupted stack from __stack_chk_fail [BZ #21752]

    __libc_argv[0] points to address on stack and __libc_secure_getenv
    accesses environment variables which are on stack.  We should avoid
    accessing stack when stack is corrupted.

    This patch also renames function argument in __fortify_fail_abort
    from do_backtrace to need_backtrace to avoid confusion with do_backtrace
    from enum __libc_message_action.

        [BZ #21752]
        * debug/fortify_fail.c (__fortify_fail_abort): Don't pass down
        __libc_argv[0] if we aren't doing backtrace.  Rename do_backtrace
        to need_backtrace.
        * sysdeps/posix/libc_fatal.c (__libc_message): Don't call
        __libc_secure_getenv if we aren't doing backtrace.

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=79a77e11663cae25c867aab00666d74163cfeda1

commit 79a77e11663cae25c867aab00666d74163cfeda1
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Wed Jul 19 16:53:06 2017 -0700

    tunables: Use direct syscall for access (BZ#21744)

    The function maybe_enable_malloc_check, which is called by
    __tunables_init, calls __access_noerrno.  It isn't problem when
    symbol is is in ld.so, which has a special version of __access_noerrno
    without stack protector.  But when glibc is built with stack protector,
    maybe_enable_malloc_check in libc.a can't call the regular version of
    __access_noerrno with stack protector.

    This patch changes how Linux defines the __access_noerrno to be an
    inline call instead and thus preventing defining different build
    rules for ld/static and shared.

        H.J. Lu  <hongjiu.lu@intel.com>
        Adhemerval Zanella  <adhemerval.zanella@linaro.org>

        * elf/dl-tunables.c: Include not-errno.h header.
        * include/unistd.h (__access_noerrno): Remove definition.
        * sysdeps/unix/sysv/linux/access.c (__access_noerrno): Likewise.
        * sysdeps/generic/not-errno.h: New file.
        * sysdeps/unix/sysv/linux/not-errno.h: Likewise.

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