Re: [PATCH v3 1/2] exec: add PR_HIDE_SELF_EXE prctl

[Giuseppe Scrivano]

"Colin Walters" <walters@xxxxxxxxxx> writes:

> On Fri, Jan 20, 2023, at 5:25 AM, Giuseppe Scrivano wrote:
>> This patch adds a new prctl called PR_HIDE_SELF_EXE which allows
>> processes to hide their own /proc/*/exe file. When this prctl is
>> used, every access to /proc/*/exe for the calling process will
>> fail with ENOENT.
>
> How about a mount option for procfs like `mount -t procfs procfs /proc -o rw,nosuid,nodev,magiclink-no-xdev`
>
> Where `magiclink-no-xdev` would cause all magic links to fail to cross a pid namespace or so?

wouldn't that break also stuff like "/proc/self/fd/$FD" after you join a
different PID namespace?