Re: procfs: open("/proc/self/fd/...") allows bypassing O_RDONLY

[Simon Ser]

On Thursday, May 12th, 2022 at 12:37, Simon Ser <contact@xxxxxxxxxxx> wrote:

> what would be a good way to share a FD to another
> process without allowing it to write to the underlying file?

(I'm reminded that memfd + seals exist for this purpose. Still, I'd be
interested to know whether that O_RDONLY/O_RDWR behavior is intended,
because it's pretty surprising. The motivation for using O_RDONLY over
memfd seals is that it isn't Linux-specific.)