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b27f88f61d
Instead of using a special case of the annotate_mapping syscall, let's introduce a new prctl option to disallow further annotations of Regions as new syscall Region(s).
45 lines
1.5 KiB
C++
45 lines
1.5 KiB
C++
/*
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* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <Kernel/API/prctl_numbers.h>
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#include <Kernel/Process.h>
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namespace Kernel {
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ErrorOr<FlatPtr> Process::sys$prctl(int option, FlatPtr arg1, [[maybe_unused]] FlatPtr arg2)
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{
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this);
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return with_mutable_protected_data([&](auto& protected_data) -> ErrorOr<FlatPtr> {
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switch (option) {
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case PR_GET_DUMPABLE:
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return protected_data.dumpable;
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case PR_SET_DUMPABLE:
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if (arg1 != 0 && arg1 != 1)
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return EINVAL;
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protected_data.dumpable = arg1;
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return 0;
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case PR_GET_NO_NEW_SYSCALL_REGION_ANNOTATIONS:
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return address_space().with([&](auto& space) -> ErrorOr<FlatPtr> {
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return space->enforces_syscall_regions();
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});
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case PR_SET_NO_NEW_SYSCALL_REGION_ANNOTATIONS:
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if (arg1 != 0 && arg1 != 1)
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return EINVAL;
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bool prohibit_new_annotated_syscall_regions = (arg1 == 1);
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return address_space().with([&](auto& space) -> ErrorOr<FlatPtr> {
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if (space->enforces_syscall_regions() && !prohibit_new_annotated_syscall_regions)
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return EPERM;
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space->set_enforces_syscall_regions(prohibit_new_annotated_syscall_regions);
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return 0;
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});
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return 0;
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}
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return EINVAL;
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});
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}
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}
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