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b81ee54bc9
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>
48 lines
1.6 KiB
C
48 lines
1.6 KiB
C
/* AArch64 definitions for libc main startup.
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Copyright (C) 2024-2025 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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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<https://www.gnu.org/licenses/>. */
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#ifndef _LIBC_START_H
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#define _LIBC_START_H
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#ifndef SHARED
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# ifndef PR_SET_SHADOW_STACK_STATUS
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# define PR_SET_SHADOW_STACK_STATUS 75
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# define PR_SHADOW_STACK_ENABLE (1UL << 0)
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# endif
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/* Must be on a top-level stack frame that does not return. */
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static inline void __attribute__((always_inline))
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aarch64_libc_setup_tls (void)
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{
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__libc_setup_tls ();
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if (GL(dl_aarch64_gcs) != 0)
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{
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int ret = INLINE_SYSCALL_CALL (prctl, PR_SET_SHADOW_STACK_STATUS,
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PR_SHADOW_STACK_ENABLE, 0, 0, 0);
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if (ret)
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_dl_fatal_printf ("failed to enable GCS: %d\n", -ret);
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}
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}
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# define ARCH_SETUP_IREL() apply_irel ()
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# define ARCH_SETUP_TLS() aarch64_libc_setup_tls ()
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# define ARCH_APPLY_IREL()
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#endif /* ! SHARED */
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#endif /* _LIBC_START_H */
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