Re: [PATCH RESEND] binder: handle PID namespace conversion for freeze operation

[jongan . kim]

Alice Ryhl @ 2026-01-15  8:41 UTC wrote:
> On Thu, Jan 15, 2026 at 05:06:19PM +0900, jongan.kim@xxxxxxx wrote:
> > As Alice mentioned, since only the freeze operation takes a pid as input, it
> > receives the local pid of the namespace. This patch converts this pid to the
> > global pid of the init namespace for matching pid of binder_procs properly.
> > (binder_procs has `task->group_leader->pid`). Are there any concerns or 
> > problems for this logic?
>
> This isn't new with your changes ... but it does have a race where the
> target process dies and gets replaced by a new process with the same pid
> just before you invoke the freeze ioctl.

Thanks for sharing! Has this issue been encountered before? I think there may
be a potential problem, although it is very unlikely to occur. (It is also very
hard to fix and verify the problem I guess...)
For now I want to focus on the patch submitted regarding the PID namespace on
this thread. Please check if there are any issues with merging this patch into
the binder driver.

Thanks. // JongAn, Kim