Date: Mon, 10 Jul 2023 17:52:04 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 272446] automount -c clobbers flags of mounted direct map entries Message-ID: <bug-272446-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D272446 Bug ID: 272446 Summary: automount -c clobbers flags of mounted direct map entries Product: Base System Version: CURRENT Hardware: Any OS: Any Status: New Severity: Affects Some People Priority: --- Component: bin Assignee: bugs@FreeBSD.org Reporter: andrew@tao11.riddles.org.uk If you try and enable both the -media and -noauto maps from the sample auto_master, and enable use of automount -c from devd as suggested in the comments, then on every devd event, the flags of all the -noauto filesystems are reset (clearing the "automounted" flag and, more critically, flags such= as "readonly" and "nosuid"). This happens because when traversing the mount list, there are two entries = for each -noauto map entry that is currently active: the autofs filesystem itse= lf, and the real filesystem mounted on top of it. The automount program sees the first of those, and issues the equivalent of "mount -u /path" on it, WITHOUT checking whether "/path" is currently mounted over. This can be partially fixed in the userland code, but that obviously leaves= a race condition. Accordingly the attached review includes both a kernel and a userland change: the kernel change is to require that the fstype field pass= ed to nmount does actually match the VFS type of the filesystem to be updated. https://reviews.freebsd.org/D40961 --=20 You are receiving this mail because: You are the assignee for the bug.=
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