mirror of
https://github.com/RGBCube/serenity
synced 2025-10-31 21:52:45 +00:00
7c0540a229
This has KString, KBuffer, DoubleBuffer, KBufferBuilder, IOWindow, UserOrKernelBuffer and ScopedCritical classes being moved to the Kernel/Library subdirectory. Also, move the panic and assertions handling code to that directory.
85 lines
3.2 KiB
C++
85 lines
3.2 KiB
C++
/*
|
|
* Copyright (c) 2022, Liav A. <liavalb@hotmail.co.il>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#include <AK/Userspace.h>
|
|
#include <Kernel/API/Jail.h>
|
|
#include <Kernel/Library/StdLib.h>
|
|
#include <Kernel/Security/Jail.h>
|
|
#include <Kernel/Tasks/Process.h>
|
|
|
|
namespace Kernel {
|
|
|
|
constexpr size_t jail_name_max_size = 50;
|
|
|
|
ErrorOr<FlatPtr> Process::sys$jail_create(Userspace<Syscall::SC_jail_create_params*> user_params)
|
|
{
|
|
VERIFY_NO_PROCESS_BIG_LOCK(this);
|
|
TRY(require_promise(Pledge::jail));
|
|
|
|
auto params = TRY(copy_typed_from_user(user_params));
|
|
auto jail_name = TRY(get_syscall_path_argument(params.name));
|
|
if (jail_name->length() > jail_name_max_size)
|
|
return ENAMETOOLONG;
|
|
|
|
params.index = TRY(m_attached_jail.with([&](auto& my_jail) -> ErrorOr<u64> {
|
|
// Note: If we are already in a jail, don't let the process to be able to create other jails
|
|
// even if it will not be able to join them later on. The reason for this is to prevent as much as possible
|
|
// any info leak about the "outside world" jail metadata.
|
|
if (my_jail)
|
|
return Error::from_errno(EPERM);
|
|
auto jail = TRY(Jail::create(move(jail_name), static_cast<unsigned>(params.flags)));
|
|
return jail->index().value();
|
|
}));
|
|
// Note: We do the copy_to_user outside of the m_attached_jail Spinlock locked scope because
|
|
// we rely on page faults to work properly.
|
|
TRY(copy_to_user(user_params, ¶ms));
|
|
return 0;
|
|
}
|
|
|
|
ErrorOr<FlatPtr> Process::sys$jail_attach(Userspace<Syscall::SC_jail_attach_params const*> user_params)
|
|
{
|
|
VERIFY_NO_PROCESS_BIG_LOCK(this);
|
|
TRY(require_promise(Pledge::jail));
|
|
|
|
// NOTE: Because the user might run a binary that is using this syscall and
|
|
// that binary was marked as SUID, then the user might be unaware of the
|
|
// fact that while no new setuid binaries might be executed, he is already
|
|
// running within such binary so for the sake of completeness and preventing
|
|
// naive sense of being secure, we should block that.
|
|
TRY(with_protected_data([&](auto& protected_data) -> ErrorOr<void> {
|
|
if (protected_data.executable_is_setid)
|
|
return EPERM;
|
|
return {};
|
|
}));
|
|
|
|
auto params = TRY(copy_typed_from_user(user_params));
|
|
return m_attached_jail.with([&](auto& my_jail) -> ErrorOr<FlatPtr> {
|
|
// Note: If we are already in a jail, don't let the process escape it even if
|
|
// it knows there are other jails.
|
|
// Note: To ensure the process doesn't try to maliciously enumerate all jails
|
|
// in the system, just return EPERM before doing anything else.
|
|
if (my_jail)
|
|
return EPERM;
|
|
auto jail = Jail::find_by_index(static_cast<JailIndex>(params.index));
|
|
if (!jail)
|
|
return EINVAL;
|
|
my_jail = *jail;
|
|
my_jail->attach_count().with([&](auto& attach_count) {
|
|
attach_count++;
|
|
});
|
|
m_jail_process_list.with([&](auto& list_ptr) {
|
|
list_ptr = my_jail->process_list();
|
|
if (list_ptr) {
|
|
list_ptr->attached_processes().with([&](auto& list) {
|
|
list.append(*this);
|
|
});
|
|
}
|
|
});
|
|
return 0;
|
|
});
|
|
}
|
|
|
|
}
|