git: 351acbedde16 - stable/13 - devctl: don't publish the mount options
Warner Losh
imp at FreeBSD.org
Sun Sep 12 16:35:21 UTC 2021
The branch stable/13 has been updated by imp:
URL: https://cgit.FreeBSD.org/src/commit/?id=351acbedde1691eb64d34a94b3fcbddbf3662491
commit 351acbedde1691eb64d34a94b3fcbddbf3662491
Author: Warner Losh <imp at FreeBSD.org>
AuthorDate: 2021-07-24 15:03:53 +0000
Commit: Warner Losh <imp at FreeBSD.org>
CommitDate: 2021-09-12 15:56:14 +0000
devctl: don't publish the mount options
Mount options aren't solely ASCII strings. In addition, experience to
date suggests that the mount options are much less useful than was
originally supposed and the mount flags suffice to make decisions. Drop
the reporting of options for the mount/remount/unmount events.
Reviewed by: markj
Reported by: KASAN
Sponsored by: Netflix
Differential Revision: https://reviews.freebsd.org/D31287
(cherry picked from commit 6475667f7b72f5eb8fcd045967c251e45e38e2a2)
---
sys/kern/vfs_mount.c | 31 +++++++------------------------
1 file changed, 7 insertions(+), 24 deletions(-)
diff --git a/sys/kern/vfs_mount.c b/sys/kern/vfs_mount.c
index 7dc6b795eefd..09c9a59d1bed 100644
--- a/sys/kern/vfs_mount.c
+++ b/sys/kern/vfs_mount.c
@@ -2516,27 +2516,6 @@ static struct mntoptnames optnames[] = {
MNTOPT_NAMES
};
-static void
-mount_devctl_event_mntopt(struct sbuf *sb, const char *what, struct vfsoptlist *opts)
-{
- struct vfsopt *opt;
-
- if (opts == NULL || TAILQ_EMPTY(opts))
- return;
- sbuf_printf(sb, " %s=\"", what);
- TAILQ_FOREACH(opt, opts, link) {
- if (opt->name[0] == '\0' || (opt->len > 0 && *(char *)opt->value == '\0'))
- continue;
- devctl_safe_quote_sb(sb, opt->name);
- if (opt->len > 0) {
- sbuf_putc(sb, '=');
- devctl_safe_quote_sb(sb, opt->value);
- }
- sbuf_putc(sb, ';');
- }
- sbuf_putc(sb, '"');
-}
-
#define DEVCTL_LEN 1024
static void
mount_devctl_event(const char *type, struct mount *mp, bool donew)
@@ -2569,11 +2548,15 @@ mount_devctl_event(const char *type, struct mount *mp, bool donew)
}
}
sbuf_putc(&sb, '"');
- mount_devctl_event_mntopt(&sb, "opt", mp->mnt_opt);
- if (donew)
- mount_devctl_event_mntopt(&sb, "optnew", mp->mnt_optnew);
sbuf_finish(&sb);
+ /*
+ * Options are not published because the form of the options depends on
+ * the file system and may include binary data. In addition, they don't
+ * necessarily provide enough useful information to be actionable when
+ * devd processes them.
+ */
+
if (sbuf_error(&sb) == 0)
devctl_notify("VFS", "FS", type, sbuf_data(&sb));
sbuf_delete(&sb);
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