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aarch64: Enable GCS in static linked exe

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Use the ARCH_SETUP_TLS hook to enable GCS in the static linked case.
The system call must be inlined and then GCS is enabled on a top
level stack frame that does not return and has no exception handlers
above it.
This commit is contained in:
Szabolcs Nagy 2023-07-13 07:22:44 +01:00 committed by Yury Khrustalev
parent 6c973abacf
commit 1120769432
1 changed files with 49 additions and 0 deletions
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49
sysdeps/unix/sysv/linux/aarch64/libc-start.h Normal file
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/* AArch64 definitions for libc main startup.
Copyright (C) 2024 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
<https://www.gnu.org/licenses/>. */
#ifndef _LIBC_START_H
#define _LIBC_START_H
#ifndef SHARED
# ifndef PR_SET_SHADOW_STACK_STATUS
# define PR_GET_SHADOW_STACK_STATUS 74
# define PR_SET_SHADOW_STACK_STATUS 75
# define PR_LOCK_SHADOW_STACK_STATUS 76
# define PR_SHADOW_STACK_ENABLE (1UL << 0)
# define PR_SHADOW_STACK_WRITE (1UL << 1)
# define PR_SHADOW_STACK_PUSH (1UL << 2)
# endif
/* Must be on a top-level stack frame that does not return. */
static inline void __attribute__((always_inline))
aarch64_libc_setup_tls (void)
{
__libc_setup_tls ();
uint64_t s = GL(dl_aarch64_gcs);
if (s != 0)
INLINE_SYSCALL_CALL (prctl, PR_SET_SHADOW_STACK_STATUS, s, 0, 0, 0);
}
# define ARCH_SETUP_IREL() apply_irel ()
# define ARCH_SETUP_TLS() aarch64_libc_setup_tls ()
# define ARCH_APPLY_IREL()
#endif /* ! SHARED */
#endif /* _LIBC_START_H */