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charset=utf-8 Content-Transfer-Encoding: 8bit X-Git-Committer: markj X-Git-Repository: src X-Git-Refname: refs/heads/main X-Git-Reftype: branch X-Git-Commit: fa6fe034a73c8b17320d1e68767ad2aa99eaa8bf Auto-Submitted: auto-generated Date: Wed, 07 Oct 2026 14:56:09 +0000 Message-Id: <6ac65d89.20e42.1a0ff1ac@gitrepo.freebsd.org> The branch main has been updated by markj: URL: https://cgit.FreeBSD.org/src/commit/?id=fa6fe034a73c8b17320d1e68767ad2aa99eaa8bf commit fa6fe034a73c8b17320d1e68767ad2aa99eaa8bf Author: Mark Johnston AuthorDate: 2026-10-07 14:36:46 +0000 Commit: Mark Johnston CommitDate: 2026-10-07 14:55:57 +0000 inotify.2: Add some entries to the BUGS section MFC after: 1 week Sponsored by: The FreeBSD Foundation --- lib/libsys/inotify.2 | 26 +++++++++++++++++++++++++- 1 file changed, 25 insertions(+), 1 deletion(-) diff --git a/lib/libsys/inotify.2 b/lib/libsys/inotify.2 index 0728c65af975..f0844452f488 100644 --- a/lib/libsys/inotify.2 +++ b/lib/libsys/inotify.2 @@ -3,7 +3,7 @@ .\" .\" Copyright (c) 2025 Klara, Inc. .\" -.Dd May 19, 2025 +.Dd October 7, 2026 .Dt INOTIFY 2 .Os .Sh NAME @@ -377,3 +377,27 @@ Thus, the implementation behaves as though .Dv IN_EXCL_UNLINK is always set. +.Pp +Some inotify events rely on the kernel's name cache in order to determine +the name of the file being accessed. +Some filesystems do not use the name cache, for instance +.Xr devfs 4 , +and +.Xr tmpfs 4 +mounts with the +.Dv nonc +option set. +inotify may not reliably deliver events for files on such filesystems. +.Pp +inotify does not deliver events for +.Xr devfs 4 +files so as to avoid leaking potentially sensitive timing information. +For instance, +.Dv IN_ACCESS +events on +.Pa /dev/input +could be used to determine information about keyboard input from a different +user. +A watch on a +.Xr devfs 4 +file or directory may be created, but will not deliver any events.