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394df3815e
CET arch_prctl bits should be defined in <asm/prctl.h> from Linux kernel
header files. Add x86 <include/asm/prctl.h> for pre-CET kernel header
files.
Note: sysdeps/unix/sysv/linux/x86/include/asm/prctl.h should be removed
if <asm/prctl.h> from the required kernel header files contains CET
arch_prctl bits.
/* CET features:
IBT: GNU_PROPERTY_X86_FEATURE_1_IBT
SHSTK: GNU_PROPERTY_X86_FEATURE_1_SHSTK
*/
/* Return CET features in unsigned long long *addr:
features: addr[0].
shadow stack base address: addr[1].
shadow stack size: addr[2].
*/
# define ARCH_CET_STATUS 0x3001
/* Disable CET features in unsigned int features. */
# define ARCH_CET_DISABLE 0x3002
/* Lock all CET features. */
# define ARCH_CET_LOCK 0x3003
/* Allocate a new shadow stack with unsigned long long *addr:
IN: requested shadow stack size: *addr.
OUT: allocated shadow stack address: *addr.
*/
# define ARCH_CET_ALLOC_SHSTK 0x3004
/* Return legacy region bitmap info in unsigned long long *addr:
address: addr[0].
size: addr[1].
*/
# define ARCH_CET_LEGACY_BITMAP 0x3005
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
* sysdeps/unix/sysv/linux/x86/include/asm/prctl.h: New file.
* sysdeps/unix/sysv/linux/x86/cpu-features.c: Include
<sys/prctl.h> and <asm/prctl.h>.
(get_cet_status): Call arch_prctl with ARCH_CET_STATUS.
* sysdeps/unix/sysv/linux/x86/dl-cet.h: Include <sys/prctl.h>
and <asm/prctl.h>.
(dl_cet_allocate_legacy_bitmap): Call arch_prctl with
ARCH_CET_LEGACY_BITMAP.
(dl_cet_disable_cet): Call arch_prctl with ARCH_CET_DISABLE.
(dl_cet_lock_cet): Call arch_prctl with ARCH_CET_LOCK.
* sysdeps/x86/libc-start.c: Include <startup.h>.
56 lines
1.8 KiB
C
56 lines
1.8 KiB
C
/* Linux/x86 CET initializers function.
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Copyright (C) 2018 Free Software Foundation, Inc.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <sys/prctl.h>
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#include <asm/prctl.h>
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static inline int __attribute__ ((always_inline))
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dl_cet_allocate_legacy_bitmap (unsigned long *legacy_bitmap)
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{
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/* Allocate legacy bitmap. */
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INTERNAL_SYSCALL_DECL (err);
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#ifdef __LP64__
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return (int) INTERNAL_SYSCALL (arch_prctl, err, 2,
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ARCH_CET_LEGACY_BITMAP, legacy_bitmap);
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#else
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unsigned long long legacy_bitmap_u64[2];
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int res = INTERNAL_SYSCALL (arch_prctl, err, 2,
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ARCH_CET_LEGACY_BITMAP, legacy_bitmap_u64);
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if (res == 0)
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{
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legacy_bitmap[0] = legacy_bitmap_u64[0];
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legacy_bitmap[1] = legacy_bitmap_u64[1];
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}
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return res;
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#endif
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}
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static inline int __attribute__ ((always_inline))
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dl_cet_disable_cet (unsigned int cet_feature)
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{
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INTERNAL_SYSCALL_DECL (err);
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return (int) INTERNAL_SYSCALL (arch_prctl, err, 2, ARCH_CET_DISABLE,
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cet_feature);
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}
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static inline int __attribute__ ((always_inline))
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dl_cet_lock_cet (void)
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{
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INTERNAL_SYSCALL_DECL (err);
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return (int) INTERNAL_SYSCALL (arch_prctl, err, 2, ARCH_CET_LOCK, 0);
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}
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