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[Bug dynamic-link/21598] i386 _dl_runtime_resolve/_dl_runtime_profile is incompatible with shadow stack
- From: "cvs-commit at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Tue, 08 Aug 2017 19:14:33 +0000
- Subject: [Bug dynamic-link/21598] i386 _dl_runtime_resolve/_dl_runtime_profile is incompatible with shadow stack
- Auto-submitted: auto-generated
- References: <bug-21598-131@http.sourceware.org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=21598
--- Comment #33 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
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The branch, hjl/cet/property has been created
at 2a355dbc4700bea275b413738a7e1cb0252cb4b4 (commit)
- Log -----------------------------------------------------------------
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=2a355dbc4700bea275b413738a7e1cb0252cb4b4
commit 2a355dbc4700bea275b413738a7e1cb0252cb4b4
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=5cdac13349543cbd868cbeea93b5e1ad60be5bfc
commit 5cdac13349543cbd868cbeea93b5e1ad60be5bfc
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/configure.ac (private_function): Pass 2 parameters
in registers when CET is enabled.
* sysdeps/i386/configure: Regenerated.
* 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=e57596aeecda24f45be7e3242877fa02f2cb8bed
commit e57596aeecda24f45be7e3242877fa02f2cb8bed
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Thu Jun 22 08:51:42 2017 -0700
x86: Add IBT/SHSTK bits to cpu-features
Add IBT/SHSTK bits to cpu-features for 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
* sysdeps/x86/cpu-features.h (bit_cpu_BIT): New.
(bit_cpu_SHSTK): Likewise.
(index_cpu_IBT): Likewise.
(index_cpu_SHSTK): Likewise.
(reg_IBT): Likewise.
(reg_SHSTK): Likewise.
* sysdeps/x86/cpu-tunables.c (TUNABLE_CALLBACK (set_hwcaps)):
Handle index_cpu_IBT and index_cpu_SHSTK.
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=964db839a9671338e0cdea6a8b0afd257e94c572
commit 964db839a9671338e0cdea6a8b0afd257e94c572
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.
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=d8972c5030b2580b1f1bf8edcaf89b73c3e803c9
commit d8972c5030b2580b1f1bf8edcaf89b73c3e803c9
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Fri Jun 16 14:27:02 2017 -0700
Add private_function for private functions within glibc [BZ #21598]
USE_REGPARMS in config.h.in is only used to control how parameters are
passed for internal functions on i386. On i386, we define
# define internal_function __attribute__ ((regparm (3), stdcall))
so that we pass up to 3 integer parameters in registers for internal
functuons on i386. i386 has
_dl_runtime_resolve:
movl (%esp), %ecx
movl %eax, (%esp) # Store the function address.
movl 4(%esp), %eax
ret $12 # Jump to function address.
which is incompatible with 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
since shadow stack doesn't match return stack. We need to use register
indirect branch via %ecx. That means only 2 parameters can be passed
in registers for external function calls with lazy binding when shadow
stack is enabled. However, internal_function, which should be used only
with hidden function within libc.so, are also used with private function
calls between different shared objects of glibc.
This patch removes USE_REGPARMS from config.h.in. Instead, it defines
internal_function and private_function, which is for private function
calss between different shared objects, in config.h.in. Currently,
sysdeps/i386/configure.ac defines private_function as
# define private_function __attribute__ ((regparm (3), stdcall))
There is no change in shared objects on Linux/i686 nor Linux/x86_64.
When shadow stack is enabled, private_function will be defined as
# define private_function __attribute__ ((regparm (2), stdcall))
so that %ecx can be used as scratch register by _dl_runtime_resolve.
[BZ #21598]
* config.h.in (USE_REGPARMS): Removed.
(internal_function): Undef.
(private_function): New. Undef.
* debug/fortify_fail.c (__fortify_fail): Replace internal_function
with private_function.
* elf/dl-addr.c (_dl_addr): Likewise.
* elf/dl-error-skeleton.c (_dl_signal_error): Likewise.
(_dl_catch_error): Likewise.
* elf/dl-execstack.c (_dl_make_stack_executable): Likewise.
* elf/dl-load.c (_dl_rtld_di_serinfo): Likewise.
* elf/dl-open.c (_dl_find_dso_for_object): Likewise.
* elf/dl-support.c (_dl_make_stack_executable_hook): Likewise.
* elf/dl-sym.c (_dl_vsym): Likewise.
(_dl_sym): Likewise.
* elf/dl-tls.c (_dl_get_tls_static_info): Likewise.
(_dl_allocate_tls_init): Likewise.
(_dl_allocate_tls): Likewise.
(_dl_deallocate_tls): Likewise.
* grp/grp-merge.c (__copy_grp): Likewise.
(__merge_grp): Likewise.
* grp/grp-merge.h (__copy_grp): Likewise.
(__merge_grp): Likewise.
* include/dlfcn.h (_dl_addr): Likewise.
(_dl_sym): Likewise.
(_dl_vsym): Likewise.
* include/rpc/pmap_clnt.h (__libc_rpc_getport): Likewise.
* include/stdio.h (__fortify_fail): Likewise.
* include/stdlib.h (__strtof_nan): Likewise.
(__strtod_nan): Likewise.
(__strtold_nan): Likewise.
(__wcstof_nan): Likewise.
(__wcstod_nan): Likewise.
(__wcstold_nan): Likewise.
(__strtof128_nan): Likewise.
(__wcstof128_nan): Likewise.
* inet/inet6_scopeid_pton.c (__inet6_scopeid_pton): Likewise.
* inet/net-internal.h (__inet6_scopeid_pton): Likewise.
* nptl/allocatestack.c (__make_stacks_executable): Likewise.
* nptl/libc_pthread_init.c (__libc_pthread_init): Likewise.
* nptl/pthreadP.h (__make_stacks_executable): Likewise.
(__libc_pthread_init): Likewise.
* nss/XXX-lookup.c (DB_LOOKUP_FCT): Likewise.
(DB_COMPAT_FCT): Likewise.
* nss/getXXbyYY_r.c (DB_LOOKUP_FCT): Likewise.
* nss/getXXent_r.c (DB_LOOKUP_FCT): Likewise.
* nss/nsswitch.h (db_lookup_function): Likewise.
* resolv/gai_misc.h (__gai_sigqueue): Likewise.
* resolv/gai_sigqueue.c (__gai_sigqueue): Likewise.
* stdlib/strtod_nan_main.c (STRTOD_NAN): Likewise.
* sunrpc/pm_getport.c (__libc_rpc_getport): Likewise.
* sysdeps/generic/ldsodefs.h (_dl_make_stack_executable_hook):
Likewise.
(_dl_make_stack_executable): Likewise.
(_dl_signal_error): Likewise.
(_dl_catch_error): Likewise.
(_dl_rtld_di_serinfo): Likewise.
(_dl_allocate_tls): Likewise.
(_dl_get_tls_static_info): Likewise.
(_dl_allocate_tls_init): Likewise.
(_dl_deallocate_tls): Likewise.
(_dl_find_dso_for_object): Likewise.
* sysdeps/unix/sysv/linux/dl-execstack.c
(_dl_make_stack_executable): Likewise.
* sysdeps/unix/sysv/linux/gai_sigqueue.c (__gai_sigqueue):
Likewise.
* sysdeps/unix/sysv/linux/netlink_assert_response.c
(__netlink_assert_response): Likewise.
* sysdeps/unix/sysv/linux/netlinkaccess.h
(__netlink_assert_response): Likewise.
* include/libc-symbols.h (private_function): New.
* sysdeps/i386/configure.ac (USE_REGPARMS): Removed.
(internal_function): New AC_DEFINE.
(private_function): Likewise.
* sysdeps/i386/configure: Regenerated.
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