mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-11-13 11:42:38 +03:00
105 lines
3.5 KiB
C++
105 lines
3.5 KiB
C++
/*
|
|
* 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 <AK/StringView.h>
|
|
#include <Kernel/Process.h>
|
|
|
|
namespace Kernel {
|
|
|
|
int Process::sys$pledge(Userspace<const Syscall::SC_pledge_params*> user_params)
|
|
{
|
|
Syscall::SC_pledge_params params;
|
|
if (!validate_read_and_copy_typed(¶ms, user_params))
|
|
return -EFAULT;
|
|
|
|
if (params.promises.length > 1024 || params.execpromises.length > 1024)
|
|
return -E2BIG;
|
|
|
|
String promises;
|
|
if (params.promises.characters) {
|
|
promises = validate_and_copy_string_from_user(params.promises);
|
|
if (promises.is_null())
|
|
return -EFAULT;
|
|
}
|
|
|
|
String execpromises;
|
|
if (params.execpromises.characters) {
|
|
execpromises = validate_and_copy_string_from_user(params.execpromises);
|
|
if (execpromises.is_null())
|
|
return -EFAULT;
|
|
}
|
|
|
|
auto parse_pledge = [&](auto& pledge_spec, u32& mask) {
|
|
auto parts = pledge_spec.split_view(' ');
|
|
for (auto& part : parts) {
|
|
#define __ENUMERATE_PLEDGE_PROMISE(x) \
|
|
if (part == #x) { \
|
|
mask |= (1u << (u32)Pledge::x); \
|
|
continue; \
|
|
}
|
|
ENUMERATE_PLEDGE_PROMISES
|
|
#undef __ENUMERATE_PLEDGE_PROMISE
|
|
if (part == "dns") {
|
|
// "dns" is an alias for "unix" since DNS queries go via LookupServer
|
|
mask |= (1u << (u32)Pledge::unix);
|
|
continue;
|
|
}
|
|
return false;
|
|
}
|
|
return true;
|
|
};
|
|
|
|
u32 new_promises;
|
|
u32 new_execpromises;
|
|
|
|
if (!promises.is_null()) {
|
|
new_promises = 0;
|
|
if (!parse_pledge(promises, new_promises))
|
|
return -EINVAL;
|
|
if (m_promises && (!new_promises || new_promises & ~m_promises))
|
|
return -EPERM;
|
|
} else {
|
|
new_promises = m_promises;
|
|
}
|
|
|
|
if (!execpromises.is_null()) {
|
|
new_execpromises = 0;
|
|
if (!parse_pledge(execpromises, new_execpromises))
|
|
return -EINVAL;
|
|
if (m_execpromises && (!new_execpromises || new_execpromises & ~m_execpromises))
|
|
return -EPERM;
|
|
} else {
|
|
new_execpromises = m_execpromises;
|
|
}
|
|
|
|
m_promises = new_promises;
|
|
m_execpromises = new_execpromises;
|
|
|
|
return 0;
|
|
}
|
|
|
|
}
|