On Sat, Mar 30, 2019 at 9:11 AM Daniel Colascione [off-list ref] wrote:
How do you propose that someone open the /proc/<pid>/status file in a
race-free manner starting with the result of calling pidfd_open?
CXhrist.
If you want to open a /proc file, then open a /proc file. Don't use
pidfd_open().
Just open /proc/<pid>/
Then you can use openat() to open whatever sub-files you want.
You have two choices: either you use /proc, or you don't. Don't mix the two.
And no, we are *NOT* making pidfd_open() into some "let's expose /proc
even when it's not mounted" horror. Seriously. That's disgusting,
wrong, insecure and stupid.
Linus