[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: gnumach RPC: get info about the calling task
From: |
Joan Lledó |
Subject: |
Re: gnumach RPC: get info about the calling task |
Date: |
Sat, 16 Oct 2021 11:37:13 +0200 |
El 12/10/21 a les 20:32, Samuel Thibault ha escrit:
> Sergey Bugaev, le mar. 12 oct. 2021 16:22:48 +0300, a ecrit:
>> So in the case of vm_map-backed pager, it should matter whether you
>> have a task port to the target task, not whether you *are* the target
>> task. If someone has a task port to a task, it allows them to
>> completely control the task anyway (including making it invoke any
>> RPC); there's no additional security gains from checking who the
>> caller is, but there will be additional breakage.
>
> Yes, making the caller pass the task port should be completely enough.
Thanks for your explanations, if that's the case then I basically have it
already. I attached a patch with the changes.
The new interface needs to know about proxies, and if one range has been mapped
using a proxy, it must return the proxy and not the original object, which
could be used to bypass the proxy protection, that's why I needed a way to
lookup for used proxies from a task and an address.
I implemented that using a hash, like I did in the my previous dev_pager patch,
that seems ok and it works, but the only way I found to remove proxies from the
hash once they are not needed is to lookup for a proxy every time vm_deallocate
is called. I don't like that, since proxies are rarely used so rarely (if ever)
a range being unmaped will be present in the hash.
Ideas?
- gnumach RPC: get info about the calling task, Joan Lledó, 2021/10/12
- Re: gnumach RPC: get info about the calling task, Sergey Bugaev, 2021/10/12
- Re: gnumach RPC: get info about the calling task, Samuel Thibault, 2021/10/12
- Re: gnumach RPC: get info about the calling task,
Joan Lledó <=
- [PATCH] new interface: vm_pager, Joan Lledó, 2021/10/16
- Re: gnumach RPC: get info about the calling task, Sergey Bugaev, 2021/10/16
- Re: gnumach RPC: get info about the calling task, Sergey Bugaev, 2021/10/16
- Re: gnumach RPC: get info about the calling task, Samuel Thibault, 2021/10/16
- Re: gnumach RPC: get info about the calling task, Sergey Bugaev, 2021/10/16
- Re: gnumach RPC: get info about the calling task, Joan Lledó, 2021/10/16
- Re: gnumach RPC: get info about the calling task, Joan Lledó, 2021/10/17
- Re: gnumach RPC: get info about the calling task, Samuel Thibault, 2021/10/17
- Re: gnumach RPC: get info about the calling task, Joan Lledó, 2021/10/17
- Re: gnumach RPC: get info about the calling task, Sergey Bugaev, 2021/10/17