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c3351d4b9f
Instead of getting credentials from Process::current(), we now require that they be provided as input to the various VFS functions. This ensures that an atomic set of credentials is used throughout an entire VFS operation.
33 lines
1.0 KiB
C++
33 lines
1.0 KiB
C++
/*
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* Copyright (c) 2018-2020, 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 <AK/StringView.h>
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#include <Kernel/FileSystem/VirtualFileSystem.h>
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#include <Kernel/Process.h>
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namespace Kernel {
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ErrorOr<FlatPtr> Process::sys$readlink(Userspace<Syscall::SC_readlink_params const*> user_params)
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{
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VERIFY_NO_PROCESS_BIG_LOCK(this);
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TRY(require_promise(Pledge::rpath));
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auto params = TRY(copy_typed_from_user(user_params));
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auto path = TRY(get_syscall_path_argument(params.path));
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auto description = TRY(VirtualFileSystem::the().open(credentials(), path->view(), O_RDONLY | O_NOFOLLOW_NOERROR, 0, current_directory()));
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if (!description->metadata().is_symlink())
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return EINVAL;
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auto link_target = TRY(description->read_entire_file());
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auto size_to_copy = min(link_target->size(), params.buffer.size);
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TRY(copy_to_user(params.buffer.data, link_target->data(), size_to_copy));
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// Note: we return the whole size here, not the copied size.
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return link_target->size();
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}
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}
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