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Kernel: Move syscall implementations out of Process.cpp
This is something I've been meaning to do for a long time, and here we finally go. This patch moves all sys$foo functions out of Process.cpp and into files in Kernel/Syscalls/. It's not exactly one syscall per file (although it could be, but I got a bit tired of the repetitive work here..) This makes hacking on individual syscalls a lot less painful since you don't have to rebuild nearly as much code every time. I'm also hopeful that this makes it easier to understand individual syscalls. :^)
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73 changed files with 6774 additions and 4485 deletions
156
Kernel/Syscalls/setuid.cpp
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156
Kernel/Syscalls/setuid.cpp
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/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <Kernel/Process.h>
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namespace Kernel {
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int Process::sys$seteuid(uid_t euid)
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{
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REQUIRE_PROMISE(id);
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if (euid != m_uid && euid != m_suid && !is_superuser())
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return -EPERM;
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m_euid = euid;
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return 0;
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}
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int Process::sys$setegid(gid_t egid)
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{
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REQUIRE_PROMISE(id);
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if (egid != m_gid && egid != m_sgid && !is_superuser())
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return -EPERM;
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m_egid = egid;
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return 0;
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}
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int Process::sys$setuid(uid_t uid)
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{
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REQUIRE_PROMISE(id);
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if (uid != m_uid && uid != m_euid && !is_superuser())
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return -EPERM;
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m_uid = uid;
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m_euid = uid;
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m_suid = uid;
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return 0;
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}
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int Process::sys$setgid(gid_t gid)
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{
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REQUIRE_PROMISE(id);
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if (gid != m_gid && gid != m_egid && !is_superuser())
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return -EPERM;
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m_gid = gid;
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m_egid = gid;
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m_sgid = gid;
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return 0;
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}
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int Process::sys$setresuid(uid_t ruid, uid_t euid, uid_t suid)
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{
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REQUIRE_PROMISE(id);
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if (ruid == (uid_t)-1)
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ruid = m_uid;
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if (euid == (uid_t)-1)
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euid = m_euid;
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if (suid == (uid_t)-1)
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suid = m_suid;
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auto ok = [this](uid_t id) { return id == m_uid || id == m_euid || id == m_suid; };
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if ((!ok(ruid) || !ok(euid) || !ok(suid)) && !is_superuser())
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return -EPERM;
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m_uid = ruid;
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m_euid = euid;
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m_suid = suid;
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return 0;
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}
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int Process::sys$setresgid(gid_t rgid, gid_t egid, gid_t sgid)
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{
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REQUIRE_PROMISE(id);
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if (rgid == (gid_t)-1)
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rgid = m_gid;
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if (egid == (gid_t)-1)
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egid = m_egid;
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if (sgid == (gid_t)-1)
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sgid = m_sgid;
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auto ok = [this](gid_t id) { return id == m_gid || id == m_egid || id == m_sgid; };
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if ((!ok(rgid) || !ok(egid) || !ok(sgid)) && !is_superuser())
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return -EPERM;
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m_gid = rgid;
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m_egid = egid;
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m_sgid = sgid;
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return 0;
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}
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int Process::sys$setgroups(ssize_t count, const gid_t* user_gids)
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{
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REQUIRE_PROMISE(id);
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if (count < 0)
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return -EINVAL;
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if (!is_superuser())
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return -EPERM;
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if (count && !validate_read(user_gids, count))
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return -EFAULT;
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if (!count) {
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m_extra_gids.clear();
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return 0;
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}
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Vector<gid_t> gids;
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gids.resize(count);
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copy_from_user(gids.data(), user_gids, sizeof(gid_t) * count);
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HashTable<gid_t> unique_extra_gids;
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for (auto& gid : gids) {
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if (gid != m_gid)
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unique_extra_gids.set(gid);
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}
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m_extra_gids.resize(unique_extra_gids.size());
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size_t i = 0;
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for (auto& gid : unique_extra_gids) {
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if (gid == m_gid)
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continue;
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m_extra_gids[i++] = gid;
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}
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return 0;
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}
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}
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