Re: kern/57552: fileassoc(9) causes rm to take kernel lock even when never used

[Taylor R Campbell <riastradh%NetBSD.org@localhost>]

The following reply was made to PR kern/57552; it has been noted by GNATS.

From: Taylor R Campbell <riastradh%NetBSD.org@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: kern-bug-people%netbsd.org@localhost, gnats-admin%netbsd.org@localhost,
	netbsd-bugs%netbsd.org@localhost, campbell+netbsd%mumble.net@localhost
Subject: Re: kern/57552: fileassoc(9) causes rm to take kernel lock even when
	never used
Date: Mon, 31 Jul 2023 13:16:19 +0000

 > Date: Mon, 31 Jul 2023 01:00:02 +0000 (UTC)
 > From: David Holland <dholland-bugs%netbsd.org@localhost>
 >  
 >  > (It's also not clear vp->v_mount is safe inside fileassoc_file_lookup.)
 > 
 > That one I don't follow. The mount shouldn't be able to go away while
 > the caller is holding a vnode.
 
 The vnode can change identity while the caller holds a reference, if
 it is concurrently revoked.  Unless there's some non-obvious context
 guaranteeing concurrent revoke can't happen, access to vp->v_mount
 would race with that.