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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.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
This commit is contained in:
Szabolcs Nagy 2023-07-13 07:22:44 +01:00 • committed by Yury Khrustalev
parent 9ad3d9267d
commit b81ee54bc9
1 changed files with 48 additions and 0 deletions
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48
sysdeps/unix/sysv/linux/aarch64/libc-start.h Normal file
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/* AArch64 definitions for libc main startup.
Copyright (C) 2024-2025 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_SET_SHADOW_STACK_STATUS 75
# define PR_SHADOW_STACK_ENABLE (1UL << 0)
# 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 ();
if (GL(dl_aarch64_gcs) != 0)
{
int ret = INLINE_SYSCALL_CALL (prctl, PR_SET_SHADOW_STACK_STATUS,
PR_SHADOW_STACK_ENABLE, 0, 0, 0);
if (ret)
_dl_fatal_printf ("failed to enable GCS: %d\n", -ret);
}
}
# define ARCH_SETUP_IREL() apply_irel ()
# define ARCH_SETUP_TLS() aarch64_libc_setup_tls ()
# define ARCH_APPLY_IREL()
#endif /* ! SHARED */
#endif /* _LIBC_START_H */