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3fd4997fc2
Instead, use the FixedCharBuffer class to ensure we always use a static buffer storage for these names. This ensures that if a Process or a Thread were created, there's a guarantee that setting a new name will never fail, as only copying of strings should be done to that static storage. The limits which are set are 32 characters for processes' names and 64 characters for thread names - this is because threads' names could be more verbose than processes' names.
88 lines
3.4 KiB
C++
88 lines
3.4 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/Tasks/Process.h>
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namespace Kernel {
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ErrorOr<FlatPtr> Process::sys$prctl(int option, FlatPtr arg1, FlatPtr arg2)
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{
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VERIFY_NO_PROCESS_BIG_LOCK(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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case PR_SET_COREDUMP_METADATA_VALUE: {
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auto params = TRY(copy_typed_from_user<Syscall::SC_set_coredump_metadata_params>(arg1));
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if (params.key.length == 0 || params.key.length > 16 * KiB)
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return EINVAL;
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if (params.value.length > 16 * KiB)
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return EINVAL;
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auto key = TRY(try_copy_kstring_from_user(params.key));
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auto value = TRY(try_copy_kstring_from_user(params.value));
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TRY(set_coredump_property(move(key), move(value)));
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return 0;
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}
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case PR_SET_PROCESS_NAME: {
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TRY(require_promise(Pledge::proc));
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Userspace<char const*> buffer = arg1;
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int user_buffer_size = static_cast<int>(arg2);
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if (user_buffer_size < 0)
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return EINVAL;
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size_t buffer_size = static_cast<size_t>(user_buffer_size);
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Process::Name process_name {};
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TRY(try_copy_name_from_user_into_fixed_string_buffer<32>(buffer, process_name, buffer_size));
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// NOTE: Reject empty and whitespace-only names, as they only confuse users.
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if (process_name.representable_view().is_whitespace())
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return EINVAL;
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set_name(process_name.representable_view());
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return 0;
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}
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case PR_GET_PROCESS_NAME: {
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TRY(require_promise(Pledge::stdio));
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Userspace<char*> buffer = arg1;
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int user_buffer_size = arg2;
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if (user_buffer_size < 0)
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return EINVAL;
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size_t buffer_size = static_cast<size_t>(arg2);
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TRY(m_name.with([&buffer, buffer_size](auto& name) -> ErrorOr<void> {
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auto view = name.representable_view();
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if (view.length() + 1 > buffer_size)
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return ENAMETOOLONG;
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return copy_to_user(buffer, view.characters_without_null_termination(), view.length() + 1);
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}));
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return 0;
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}
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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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