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a4273efa21
Previously, HTL would always allocate non-executable stacks. This has never been noticed, since GNU Mach on x86 ignores VM_PROT_EXECUTE and makes all pages implicitly executable. Since GNU Mach on AArch64 supports non-executable pages, HTL forgetting to pass VM_PROT_EXECUTE immediately breaks any code that (unfortunately, still) relies on executable stacks. Signed-off-by: Sergey Bugaev <bugaevc@gmail.com> Message-ID: <20240323173301.151066-7-bugaevc@gmail.com>
47 lines
1.6 KiB
C
47 lines
1.6 KiB
C
/* Allocate a new stack. Mach version.
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Copyright (C) 2000-2024 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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#include <errno.h>
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#include <mach.h>
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#include <pt-internal.h>
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/* Allocate a new stack of size STACKSIZE. If successful, store the
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address of the newly allocated stack in *STACKADDR and return 0.
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Otherwise return an error code (EINVAL for an invalid stack size,
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EAGAIN if the system lacked the necessary resources to allocate a
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new stack). */
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int
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__pthread_stack_alloc (void **stackaddr, size_t stacksize)
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{
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error_t err;
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vm_prot_t prot = VM_PROT_READ | VM_PROT_WRITE;
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if (GL(dl_stack_flags) & PF_X)
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prot |= VM_PROT_EXECUTE;
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err = __vm_map (__mach_task_self (), (vm_offset_t *) stackaddr,
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stacksize, 0, TRUE, MEMORY_OBJECT_NULL, 0, FALSE,
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prot, VM_PROT_ALL, VM_INHERIT_COPY);
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if (err == KERN_NO_SPACE)
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err = EAGAIN;
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return err;
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}
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