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| author | H.J. Lu <hjl.tools@gmail.com> | 2018-07-14 05:53:05 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2018-07-14 05:56:46 -0700 |
| commit | ebff9c5cfae62e84dbd0456d564bd882818dc15f (patch) | |
| tree | bf8bb50ca20fe7cd8adbac896707bd02975ea1ff /sysdeps/x86 | |
| parent | 0a83bad2aae6807a108d5bb3eb3389060702265b (diff) | |
| download | glibc-ebff9c5cfae62e84dbd0456d564bd882818dc15f.tar glibc-ebff9c5cfae62e84dbd0456d564bd882818dc15f.tar.gz glibc-ebff9c5cfae62e84dbd0456d564bd882818dc15f.tar.bz2 glibc-ebff9c5cfae62e84dbd0456d564bd882818dc15f.zip | |
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.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
[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.
Diffstat (limited to 'sysdeps/x86')
| -rw-r--r-- | sysdeps/x86/nptl/tls-setup.h | 23 | ||||
| -rw-r--r-- | sysdeps/x86/sysdep.h | 27 |
2 files changed, 50 insertions, 0 deletions
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. */ |