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Kernel: Move syscall implementations out of Process.cpp

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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. :^)
This commit is contained in:
Andreas Kling 2020-07-30 23:38:15 +02:00
parent 027c450d6d
commit 949aef4aef
73 changed files with 6774 additions and 4485 deletions
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156
Kernel/Syscalls/setuid.cpp Normal file
View file

@ -0,0 +1,156 @@
/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <Kernel/Process.h>
namespace Kernel {
int Process::sys$seteuid(uid_t euid)
{
REQUIRE_PROMISE(id);
if (euid != m_uid && euid != m_suid && !is_superuser())
return -EPERM;
m_euid = euid;
return 0;
}
int Process::sys$setegid(gid_t egid)
{
REQUIRE_PROMISE(id);
if (egid != m_gid && egid != m_sgid && !is_superuser())
return -EPERM;
m_egid = egid;
return 0;
}
int Process::sys$setuid(uid_t uid)
{
REQUIRE_PROMISE(id);
if (uid != m_uid && uid != m_euid && !is_superuser())
return -EPERM;
m_uid = uid;
m_euid = uid;
m_suid = uid;
return 0;
}
int Process::sys$setgid(gid_t gid)
{
REQUIRE_PROMISE(id);
if (gid != m_gid && gid != m_egid && !is_superuser())
return -EPERM;
m_gid = gid;
m_egid = gid;
m_sgid = gid;
return 0;
}
int Process::sys$setresuid(uid_t ruid, uid_t euid, uid_t suid)
{
REQUIRE_PROMISE(id);
if (ruid == (uid_t)-1)
ruid = m_uid;
if (euid == (uid_t)-1)
euid = m_euid;
if (suid == (uid_t)-1)
suid = m_suid;
auto ok = [this](uid_t id) { return id == m_uid || id == m_euid || id == m_suid; };
if ((!ok(ruid) || !ok(euid) || !ok(suid)) && !is_superuser())
return -EPERM;
m_uid = ruid;
m_euid = euid;
m_suid = suid;
return 0;
}
int Process::sys$setresgid(gid_t rgid, gid_t egid, gid_t sgid)
{
REQUIRE_PROMISE(id);
if (rgid == (gid_t)-1)
rgid = m_gid;
if (egid == (gid_t)-1)
egid = m_egid;
if (sgid == (gid_t)-1)
sgid = m_sgid;
auto ok = [this](gid_t id) { return id == m_gid || id == m_egid || id == m_sgid; };
if ((!ok(rgid) || !ok(egid) || !ok(sgid)) && !is_superuser())
return -EPERM;
m_gid = rgid;
m_egid = egid;
m_sgid = sgid;
return 0;
}
int Process::sys$setgroups(ssize_t count, const gid_t* user_gids)
{
REQUIRE_PROMISE(id);
if (count < 0)
return -EINVAL;
if (!is_superuser())
return -EPERM;
if (count && !validate_read(user_gids, count))
return -EFAULT;
if (!count) {
m_extra_gids.clear();
return 0;
}
Vector<gid_t> gids;
gids.resize(count);
copy_from_user(gids.data(), user_gids, sizeof(gid_t) * count);
HashTable<gid_t> unique_extra_gids;
for (auto& gid : gids) {
if (gid != m_gid)
unique_extra_gids.set(gid);
}
m_extra_gids.resize(unique_extra_gids.size());
size_t i = 0;
for (auto& gid : unique_extra_gids) {
if (gid == m_gid)
continue;
m_extra_gids[i++] = gid;
}
return 0;
}
}