V3: [PATCH 01/24] x86: Rename __glibc_reserved1 to feature_1 in tcbhead_t [BZ #22563]
Commit Message
On Fri, Jul 13, 2018 at 11:51 AM, Carlos O'Donell <carlos@redhat.com> wrote:
> On 07/13/2018 09:19 AM, H.J. Lu wrote:
>> On Wed, Jun 13, 2018 at 08:31:44AM -0700, H.J. Lu wrote:
>>> This will be used by CET run-time control.
>>>
>>> [BZ #22563]
>>> * nptl/pthread_create.c (__pthread_create_2_1): Use
>>> THREAD_COPY_ADDITONAL_INFO to copy additonal info if defined.
>>> * sysdeps/i386/nptl/tcb-offsets.sym (FEATURE_1_OFFSET): New.
>>> * sysdeps/x86_64/nptl/tcb-offsets.sym (FEATURE_1_OFFSET):
>>> Likewise.
>>> * sysdeps/i386/nptl/tls.h (tcbhead_t): Rename __glibc_reserved1
>>> to feature_1.
>>> * sysdeps/x86_64/nptl/tls.h (tcbhead_t): Likewise.
>>> * sysdeps/unix/sysv/linux/x86/pthreaddef.h: New file.
>>
>> Here is the updated patch to add feature_1 to tcbhead_t and
>> introduce macros for CET enabling. OK for master?
>
> Fix the typo-prone macro API and post a v3 please.
>
> Thank you.
>
>>
>> H.J.
>> ----
>> feature_1 has X86_FEATURE_1_IBT and X86_FEATURE_1_SHSTK bits for CET
>> run-time control.
>>
>> CET_ENABLED, IBT_ENABLED and SHSTK_ENABLED are defined to 1 or 0 to
>> indicate that if CET, IBT and SHSTK are enabled.
>
> OK.
>
>>
>> [BZ #22563]
>> * nptl/pthread_create.c (__pthread_create_2_1): Use
>> THREAD_COPY_ADDITONAL_INFO to copy additonal info if defined.
>> * sysdeps/i386/nptl/tcb-offsets.sym (FEATURE_1_OFFSET): New.
>> * sysdeps/x86_64/nptl/tcb-offsets.sym (FEATURE_1_OFFSET):
>> Likewise.
>> * sysdeps/i386/nptl/tls.h (tcbhead_t): Rename __glibc_reserved1
>> to feature_1.
>> * sysdeps/x86_64/nptl/tls.h (tcbhead_t): Likewise.
>> * sysdeps/unix/sysv/linux/x86/pthreaddef.h: New file.
>> * sysdeps/x86/sysdep.h (X86_FEATURE_1_IBT): New.
>> (X86_FEATURE_1_SHSTK): Likewise.
>> (CET_ENABLED): Likewise.
>> (IBT_ENABLED): Likewise.
>> (SHSTK_ENABLED): Likewise.
>> ---
>> nptl/pthread_create.c | 5 +++++
>> sysdeps/i386/nptl/tcb-offsets.sym | 1 +
>> sysdeps/i386/nptl/tls.h | 5 ++++-
>> sysdeps/unix/sysv/linux/x86/pthreaddef.h | 24 +++++++++++++++++++++
>> sysdeps/x86/sysdep.h | 27 ++++++++++++++++++++++++
>> sysdeps/x86_64/nptl/tcb-offsets.sym | 1 +
>> sysdeps/x86_64/nptl/tls.h | 5 ++++-
>> 7 files changed, 66 insertions(+), 2 deletions(-)
>> create mode 100644 sysdeps/unix/sysv/linux/x86/pthreaddef.h
>>
>> diff --git a/nptl/pthread_create.c b/nptl/pthread_create.c
>> index 92c945b12b..16998f4bbd 100644
>> --- a/nptl/pthread_create.c
>> +++ b/nptl/pthread_create.c
>> @@ -712,6 +712,11 @@ __pthread_create_2_1 (pthread_t *newthread, const pthread_attr_t *attr,
>> THREAD_COPY_POINTER_GUARD (pd);
>> #endif
>>
>> + /* Copy additonal info. */
>> +#ifdef THREAD_COPY_ADDITONAL_INFO
>> + THREAD_COPY_ADDITONAL_INFO (pd);
>> +#endif
>
> This is a typo-prone macro API.
>
> Please find a way to define this unconditionally.
>
Here is the V3 patch. I added <tls-setup.h> to set up thread-local data.
OK for master?
Thanks.
Comments
On 07/13/2018 04:49 PM, H.J. Lu wrote:
> On Fri, Jul 13, 2018 at 11:51 AM, Carlos O'Donell <carlos@redhat.com> wrote:
>> On 07/13/2018 09:19 AM, H.J. Lu wrote:
>>> On Wed, Jun 13, 2018 at 08:31:44AM -0700, H.J. Lu wrote:
>>>> This will be used by CET run-time control.
>>>>
>>>> [BZ #22563]
>>>> * nptl/pthread_create.c (__pthread_create_2_1): Use
>>>> THREAD_COPY_ADDITONAL_INFO to copy additonal info if defined.
>>>> * sysdeps/i386/nptl/tcb-offsets.sym (FEATURE_1_OFFSET): New.
>>>> * sysdeps/x86_64/nptl/tcb-offsets.sym (FEATURE_1_OFFSET):
>>>> Likewise.
>>>> * sysdeps/i386/nptl/tls.h (tcbhead_t): Rename __glibc_reserved1
>>>> to feature_1.
>>>> * sysdeps/x86_64/nptl/tls.h (tcbhead_t): Likewise.
>>>> * sysdeps/unix/sysv/linux/x86/pthreaddef.h: New file.
>>> Here is the updated patch to add feature_1 to tcbhead_t and
>>> introduce macros for CET enabling. OK for master?
>> Fix the typo-prone macro API and post a v3 please.
>>
>> Thank you.
>>
>>> H.J.
>>> ----
>>> feature_1 has X86_FEATURE_1_IBT and X86_FEATURE_1_SHSTK bits for CET
>>> run-time control.
>>>
>>> CET_ENABLED, IBT_ENABLED and SHSTK_ENABLED are defined to 1 or 0 to
>>> indicate that if CET, IBT and SHSTK are enabled.
>> OK.
>>
>>> [BZ #22563]
>>> * nptl/pthread_create.c (__pthread_create_2_1): Use
>>> THREAD_COPY_ADDITONAL_INFO to copy additonal info if defined.
>>> * sysdeps/i386/nptl/tcb-offsets.sym (FEATURE_1_OFFSET): New.
>>> * sysdeps/x86_64/nptl/tcb-offsets.sym (FEATURE_1_OFFSET):
>>> Likewise.
>>> * sysdeps/i386/nptl/tls.h (tcbhead_t): Rename __glibc_reserved1
>>> to feature_1.
>>> * sysdeps/x86_64/nptl/tls.h (tcbhead_t): Likewise.
>>> * sysdeps/unix/sysv/linux/x86/pthreaddef.h: New file.
>>> * sysdeps/x86/sysdep.h (X86_FEATURE_1_IBT): New.
>>> (X86_FEATURE_1_SHSTK): Likewise.
>>> (CET_ENABLED): Likewise.
>>> (IBT_ENABLED): Likewise.
>>> (SHSTK_ENABLED): Likewise.
>>> ---
>>> nptl/pthread_create.c | 5 +++++
>>> sysdeps/i386/nptl/tcb-offsets.sym | 1 +
>>> sysdeps/i386/nptl/tls.h | 5 ++++-
>>> sysdeps/unix/sysv/linux/x86/pthreaddef.h | 24 +++++++++++++++++++++
>>> sysdeps/x86/sysdep.h | 27 ++++++++++++++++++++++++
>>> sysdeps/x86_64/nptl/tcb-offsets.sym | 1 +
>>> sysdeps/x86_64/nptl/tls.h | 5 ++++-
>>> 7 files changed, 66 insertions(+), 2 deletions(-)
>>> create mode 100644 sysdeps/unix/sysv/linux/x86/pthreaddef.h
>>>
>>> diff --git a/nptl/pthread_create.c b/nptl/pthread_create.c
>>> index 92c945b12b..16998f4bbd 100644
>>> --- a/nptl/pthread_create.c
>>> +++ b/nptl/pthread_create.c
>>> @@ -712,6 +712,11 @@ __pthread_create_2_1 (pthread_t *newthread, const pthread_attr_t *attr,
>>> THREAD_COPY_POINTER_GUARD (pd);
>>> #endif
>>>
>>> + /* Copy additonal info. */
>>> +#ifdef THREAD_COPY_ADDITONAL_INFO
>>> + THREAD_COPY_ADDITONAL_INFO (pd);
>>> +#endif
>> This is a typo-prone macro API.
>>
>> Please find a way to define this unconditionally.
>>
> Here is the V3 patch. I added <tls-setup.h> to set up thread-local data.
> OK for master?
This version looks good. I have to go over your other patches and continue
reviewing. Thanks for the new versions.
Please commit.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
> Thanks.
>
> -- H.J.
>
>
> 0001-x86-Rename-__glibc_reserved1-to-feature_1-in-tcbhead.patch
>
>
> From 600fb331fed5aefc40bd3b95f753ab458b1b796b Mon Sep 17 00:00:00 2001
> From: "H.J. Lu" <hjl.tools@gmail.com>
> Date: Thu, 7 Dec 2017 05:47:21 -0800
> Subject: [PATCH 01/24] x86: Rename __glibc_reserved1 to feature_1 in tcbhead_t
> [BZ #22563]
>
> feature_1 has X86_FEATURE_1_IBT and X86_FEATURE_1_SHSTK bits for CET
> run-time control.
>
> CET_ENABLED, IBT_ENABLED and SHSTK_ENABLED are defined to 1 or 0 to
> indicate that if CET, IBT and SHSTK are enabled.
>
> <tls-setup.h> is added to set up thread-local data.
>
> [BZ #22563]
> * nptl/pthread_create.c: Include <tls-setup.h>.
> (__pthread_create_2_1): Call tls_setup_tcbhead.
> * sysdeps/generic/tls-setup.h: New file.
> * sysdeps/x86/nptl/tls-setup.h: Likewise.
> * sysdeps/i386/nptl/tcb-offsets.sym (FEATURE_1_OFFSET): New.
> * sysdeps/x86_64/nptl/tcb-offsets.sym (FEATURE_1_OFFSET):
> Likewise.
> * sysdeps/i386/nptl/tls.h (tcbhead_t): Rename __glibc_reserved1
> to feature_1.
> * sysdeps/x86_64/nptl/tls.h (tcbhead_t): Likewise.
> * sysdeps/x86/sysdep.h (X86_FEATURE_1_IBT): New.
> (X86_FEATURE_1_SHSTK): Likewise.
> (CET_ENABLED): Likewise.
> (IBT_ENABLED): Likewise.
> (SHSTK_ENABLED): Likewise.
> ---
> nptl/pthread_create.c | 4 ++++
> sysdeps/generic/tls-setup.h | 22 ++++++++++++++++++++++
> sysdeps/i386/nptl/tcb-offsets.sym | 1 +
> sysdeps/i386/nptl/tls.h | 5 ++++-
> sysdeps/x86/nptl/tls-setup.h | 23 +++++++++++++++++++++++
> sysdeps/x86/sysdep.h | 27 +++++++++++++++++++++++++++
> sysdeps/x86_64/nptl/tcb-offsets.sym | 1 +
> sysdeps/x86_64/nptl/tls.h | 5 ++++-
> 8 files changed, 86 insertions(+), 2 deletions(-)
> create mode 100644 sysdeps/generic/tls-setup.h
> create mode 100644 sysdeps/x86/nptl/tls-setup.h
>
> diff --git a/nptl/pthread_create.c b/nptl/pthread_create.c
> index 92c945b12b..5f5a007b7f 100644
> --- a/nptl/pthread_create.c
> +++ b/nptl/pthread_create.c
> @@ -32,6 +32,7 @@
> #include <exit-thread.h>
> #include <default-sched.h>
> #include <futex-internal.h>
> +#include <tls-setup.h>
> #include "libioP.h"
>
> #include <shlib-compat.h>
> @@ -712,6 +713,9 @@ __pthread_create_2_1 (pthread_t *newthread, const pthread_attr_t *attr,
> THREAD_COPY_POINTER_GUARD (pd);
> #endif
>
> + /* Setup tcbhead. */
> + tls_setup_tcbhead (pd);
OK.
> +
> /* Verify the sysinfo bits were copied in allocate_stack if needed. */
> #ifdef NEED_DL_SYSINFO
> CHECK_THREAD_SYSINFO (pd);
> diff --git a/sysdeps/generic/tls-setup.h b/sysdeps/generic/tls-setup.h
> new file mode 100644
> index 0000000000..36389b9bce
> --- /dev/null
> +++ b/sysdeps/generic/tls-setup.h
> @@ -0,0 +1,22 @@
> +/* Definitions to set up thread-local data. Generic version.
> + Copyright (C) 2018 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library; if not, see
> + <http://www.gnu.org/licenses/>. */
> +
> +static inline void __attribute__ ((always_inline))
> +tls_setup_tcbhead (struct pthread *pd);
> +{
> +}
> diff --git a/sysdeps/i386/nptl/tcb-offsets.sym b/sysdeps/i386/nptl/tcb-offsets.sym
> index 7d7fe5e71c..fbac241c45 100644
> --- a/sysdeps/i386/nptl/tcb-offsets.sym
> +++ b/sysdeps/i386/nptl/tcb-offsets.sym
> @@ -12,3 +12,4 @@ CLEANUP offsetof (struct pthread, cleanup)
> CLEANUP_PREV offsetof (struct _pthread_cleanup_buffer, __prev)
> MUTEX_FUTEX offsetof (pthread_mutex_t, __data.__lock)
> POINTER_GUARD offsetof (tcbhead_t, pointer_guard)
> +FEATURE_1_OFFSET offsetof (tcbhead_t, feature_1)
> diff --git a/sysdeps/i386/nptl/tls.h b/sysdeps/i386/nptl/tls.h
> index afb71ce431..21e23cd809 100644
> --- a/sysdeps/i386/nptl/tls.h
> +++ b/sysdeps/i386/nptl/tls.h
> @@ -41,7 +41,10 @@ typedef struct
> uintptr_t stack_guard;
> uintptr_t pointer_guard;
> int gscope_flag;
> - int __glibc_reserved1;
> + /* Bit 0: X86_FEATURE_1_IBT.
> + Bit 1: X86_FEATURE_1_SHSTK.
> + */
> + unsigned int feature_1;
> /* Reservation of some values for the TM ABI. */
> void *__private_tm[3];
> /* GCC split stack support. */
> diff --git a/sysdeps/x86/nptl/tls-setup.h b/sysdeps/x86/nptl/tls-setup.h
> new file mode 100644
> index 0000000000..ef5a4df78c
> --- /dev/null
> +++ b/sysdeps/x86/nptl/tls-setup.h
> @@ -0,0 +1,23 @@
> +/* Definitions to set up thread-local data. x86 version.
> + Copyright (C) 2018 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library; if not, see
> + <http://www.gnu.org/licenses/>. */
> +
> +static inline void __attribute__ ((always_inline))
> +tls_setup_tcbhead (struct pthread *pd)
> +{
> + pd->header.feature_1 = THREAD_GETMEM (THREAD_SELF, header.feature_1);
> +}
> diff --git a/sysdeps/x86/sysdep.h b/sysdeps/x86/sysdep.h
> index afcb7cfd76..976566aa37 100644
> --- a/sysdeps/x86/sysdep.h
> +++ b/sysdeps/x86/sysdep.h
> @@ -21,6 +21,33 @@
>
> #include <sysdeps/generic/sysdep.h>
>
> +/* __CET__ is defined by GCC with Control-Flow Protection values:
> +
> +enum cf_protection_level
> +{
> + CF_NONE = 0,
> + CF_BRANCH = 1 << 0,
> + CF_RETURN = 1 << 1,
> + CF_FULL = CF_BRANCH | CF_RETURN,
> + CF_SET = 1 << 2
> +};
> +*/
> +
> +/* Set if CF_BRANCH (IBT) is enabled. */
> +#define X86_FEATURE_1_IBT (1U << 0)
> +/* Set if CF_RETURN (SHSTK) is enabled. */
> +#define X86_FEATURE_1_SHSTK (1U << 1)
> +
> +#ifdef __CET__
> +# define CET_ENABLED 1
> +# define IBT_ENABLED (__CET__ & X86_FEATURE_1_IBT)
> +# define SHSTK_ENABLED (__CET__ & X86_FEATURE_1_SHSTK)
> +#else
> +# define CET_ENABLED 0
> +# define IBT_ENABLED 0
> +# define SHSTK_ENABLED 0
> +#endif
> +
> #ifdef __ASSEMBLER__
>
> /* Syntactic details of assembler. */
> diff --git a/sysdeps/x86_64/nptl/tcb-offsets.sym b/sysdeps/x86_64/nptl/tcb-offsets.sym
> index be63404a16..387621e88c 100644
> --- a/sysdeps/x86_64/nptl/tcb-offsets.sym
> +++ b/sysdeps/x86_64/nptl/tcb-offsets.sym
> @@ -12,6 +12,7 @@ MUTEX_FUTEX offsetof (pthread_mutex_t, __data.__lock)
> MULTIPLE_THREADS_OFFSET offsetof (tcbhead_t, multiple_threads)
> POINTER_GUARD offsetof (tcbhead_t, pointer_guard)
> VGETCPU_CACHE_OFFSET offsetof (tcbhead_t, vgetcpu_cache)
> +FEATURE_1_OFFSET offsetof (tcbhead_t, feature_1)
>
> -- Not strictly offsets, but these values are also used in the TCB.
> TCB_CANCELSTATE_BITMASK CANCELSTATE_BITMASK
> diff --git a/sysdeps/x86_64/nptl/tls.h b/sysdeps/x86_64/nptl/tls.h
> index 65c0051dcf..f042a0250a 100644
> --- a/sysdeps/x86_64/nptl/tls.h
> +++ b/sysdeps/x86_64/nptl/tls.h
> @@ -51,7 +51,10 @@ typedef struct
> uintptr_t stack_guard;
> uintptr_t pointer_guard;
> unsigned long int vgetcpu_cache[2];
> - int __glibc_reserved1;
> + /* Bit 0: X86_FEATURE_1_IBT.
> + Bit 1: X86_FEATURE_1_SHSTK.
> + */
> + unsigned int feature_1;
> int __glibc_unused1;
> /* Reservation of some values for the TM ABI. */
> void *__private_tm[4];
> -- 2.17.1
From 600fb331fed5aefc40bd3b95f753ab458b1b796b Mon Sep 17 00:00:00 2001
From: "H.J. Lu" <hjl.tools@gmail.com>
Date: Thu, 7 Dec 2017 05:47:21 -0800
Subject: [PATCH 01/24] x86: Rename __glibc_reserved1 to feature_1 in tcbhead_t
[BZ #22563]
feature_1 has X86_FEATURE_1_IBT and X86_FEATURE_1_SHSTK bits for CET
run-time control.
CET_ENABLED, IBT_ENABLED and SHSTK_ENABLED are defined to 1 or 0 to
indicate that if CET, IBT and SHSTK are enabled.
<tls-setup.h> is added to set up thread-local data.
[BZ #22563]
* nptl/pthread_create.c: Include <tls-setup.h>.
(__pthread_create_2_1): Call tls_setup_tcbhead.
* sysdeps/generic/tls-setup.h: New file.
* sysdeps/x86/nptl/tls-setup.h: Likewise.
* sysdeps/i386/nptl/tcb-offsets.sym (FEATURE_1_OFFSET): New.
* sysdeps/x86_64/nptl/tcb-offsets.sym (FEATURE_1_OFFSET):
Likewise.
* sysdeps/i386/nptl/tls.h (tcbhead_t): Rename __glibc_reserved1
to feature_1.
* sysdeps/x86_64/nptl/tls.h (tcbhead_t): Likewise.
* sysdeps/x86/sysdep.h (X86_FEATURE_1_IBT): New.
(X86_FEATURE_1_SHSTK): Likewise.
(CET_ENABLED): Likewise.
(IBT_ENABLED): Likewise.
(SHSTK_ENABLED): Likewise.
---
nptl/pthread_create.c | 4 ++++
sysdeps/generic/tls-setup.h | 22 ++++++++++++++++++++++
sysdeps/i386/nptl/tcb-offsets.sym | 1 +
sysdeps/i386/nptl/tls.h | 5 ++++-
sysdeps/x86/nptl/tls-setup.h | 23 +++++++++++++++++++++++
sysdeps/x86/sysdep.h | 27 +++++++++++++++++++++++++++
sysdeps/x86_64/nptl/tcb-offsets.sym | 1 +
sysdeps/x86_64/nptl/tls.h | 5 ++++-
8 files changed, 86 insertions(+), 2 deletions(-)
create mode 100644 sysdeps/generic/tls-setup.h
create mode 100644 sysdeps/x86/nptl/tls-setup.h
@@ -32,6 +32,7 @@
#include <exit-thread.h>
#include <default-sched.h>
#include <futex-internal.h>
+#include <tls-setup.h>
#include "libioP.h"
#include <shlib-compat.h>
@@ -712,6 +713,9 @@ __pthread_create_2_1 (pthread_t *newthread, const pthread_attr_t *attr,
THREAD_COPY_POINTER_GUARD (pd);
#endif
+ /* Setup tcbhead. */
+ tls_setup_tcbhead (pd);
+
/* Verify the sysinfo bits were copied in allocate_stack if needed. */
#ifdef NEED_DL_SYSINFO
CHECK_THREAD_SYSINFO (pd);
new file mode 100644
@@ -0,0 +1,22 @@
+/* Definitions to set up thread-local data. Generic version.
+ Copyright (C) 2018 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+static inline void __attribute__ ((always_inline))
+tls_setup_tcbhead (struct pthread *pd);
+{
+}
@@ -12,3 +12,4 @@ CLEANUP offsetof (struct pthread, cleanup)
CLEANUP_PREV offsetof (struct _pthread_cleanup_buffer, __prev)
MUTEX_FUTEX offsetof (pthread_mutex_t, __data.__lock)
POINTER_GUARD offsetof (tcbhead_t, pointer_guard)
+FEATURE_1_OFFSET offsetof (tcbhead_t, feature_1)
@@ -41,7 +41,10 @@ typedef struct
uintptr_t stack_guard;
uintptr_t pointer_guard;
int gscope_flag;
- int __glibc_reserved1;
+ /* Bit 0: X86_FEATURE_1_IBT.
+ Bit 1: X86_FEATURE_1_SHSTK.
+ */
+ unsigned int feature_1;
/* Reservation of some values for the TM ABI. */
void *__private_tm[3];
/* GCC split stack support. */
new file mode 100644
@@ -0,0 +1,23 @@
+/* Definitions to set up thread-local data. x86 version.
+ Copyright (C) 2018 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+static inline void __attribute__ ((always_inline))
+tls_setup_tcbhead (struct pthread *pd)
+{
+ pd->header.feature_1 = THREAD_GETMEM (THREAD_SELF, header.feature_1);
+}
@@ -21,6 +21,33 @@
#include <sysdeps/generic/sysdep.h>
+/* __CET__ is defined by GCC with Control-Flow Protection values:
+
+enum cf_protection_level
+{
+ CF_NONE = 0,
+ CF_BRANCH = 1 << 0,
+ CF_RETURN = 1 << 1,
+ CF_FULL = CF_BRANCH | CF_RETURN,
+ CF_SET = 1 << 2
+};
+*/
+
+/* Set if CF_BRANCH (IBT) is enabled. */
+#define X86_FEATURE_1_IBT (1U << 0)
+/* Set if CF_RETURN (SHSTK) is enabled. */
+#define X86_FEATURE_1_SHSTK (1U << 1)
+
+#ifdef __CET__
+# define CET_ENABLED 1
+# define IBT_ENABLED (__CET__ & X86_FEATURE_1_IBT)
+# define SHSTK_ENABLED (__CET__ & X86_FEATURE_1_SHSTK)
+#else
+# define CET_ENABLED 0
+# define IBT_ENABLED 0
+# define SHSTK_ENABLED 0
+#endif
+
#ifdef __ASSEMBLER__
/* Syntactic details of assembler. */
@@ -12,6 +12,7 @@ MUTEX_FUTEX offsetof (pthread_mutex_t, __data.__lock)
MULTIPLE_THREADS_OFFSET offsetof (tcbhead_t, multiple_threads)
POINTER_GUARD offsetof (tcbhead_t, pointer_guard)
VGETCPU_CACHE_OFFSET offsetof (tcbhead_t, vgetcpu_cache)
+FEATURE_1_OFFSET offsetof (tcbhead_t, feature_1)
-- Not strictly offsets, but these values are also used in the TCB.
TCB_CANCELSTATE_BITMASK CANCELSTATE_BITMASK
@@ -51,7 +51,10 @@ typedef struct
uintptr_t stack_guard;
uintptr_t pointer_guard;
unsigned long int vgetcpu_cache[2];
- int __glibc_reserved1;
+ /* Bit 0: X86_FEATURE_1_IBT.
+ Bit 1: X86_FEATURE_1_SHSTK.
+ */
+ unsigned int feature_1;
int __glibc_unused1;
/* Reservation of some values for the TM ABI. */
void *__private_tm[4];
--
2.17.1