Fwd: Bug#764331: mount: "mount --bind -o remount" doesn't preserve flags

[Phillip Susi <psusi@ubuntu.com>]

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I thought that it had been established that the kernel did not support
any other flags with MS_BIND, but this bug report seems to show that
it did, and the new util-linux silently discards the flags.  Is this a
bug?


- -------- Forwarded Message --------
Subject: Bug#764331: mount: "mount --bind -o remount" doesn't preserve
flags
Resent-Date: Tue, 07 Oct 2014 10:36:01 +0000
Resent-From: Kusanagi Kouichi <slash@ac.auone-net.jp>
Resent-To: debian-bugs-dist@lists.debian.org
Resent-CC: Debian util-linux Maintainers <ah-util-linux@debian.org>
Date: Tue, 07 Oct 2014 10:21:55 +0000
From: Kusanagi Kouichi <slash@ac.auone-net.jp>
Reply-To: Kusanagi Kouichi <slash@ac.auone-net.jp>, 764331@bugs.debian.org
To: Debian Bug Tracking System <submit@bugs.debian.org>

Package: mount
Version: 2.25.1-3
Severity: normal

Since I upgraded mount from 2.20.1-5.11 to 2.25.1-3,
"mount --bind -o remount" doesn't preserve flags anymore.

# mount -V
mount from util-linux 2.20.1 (with libblkid and selinux support)
# grep /tmp /proc/self/mountinfo
24 15 0:22 / /tmp rw,nosuid,nodev,relatime - tmpfs /tmp rw
# strace -e trace=mount mount --bind -o remount,noexec /tmp
mount("tmp", "/tmp", 0x4104a4,
MS_MGC_VAL|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_REMOUNT|MS_BIND, NULL) = 0
+++ exited with 0 +++
# grep /tmp /proc/self/mountinfo
24 15 0:22 / /tmp rw,nosuid,nodev,noexec,relatime - tmpfs /tmp rw

# mount -V
mount from util-linux 2.25.1 (libmount 2.25.0: selinux, assert, debug)
# grep /tmp /proc/self/mountinfo
24 15 0:22 / /tmp rw,nosuid,nodev,relatime - tmpfs /tmp rw
# strace -e trace=mount mount --bind -o remount,noexec /tmp
mount("none", "/tmp", 0x125a2f0,
MS_MGC_VAL|MS_NOEXEC|MS_REMOUNT|MS_BIND, NULL) = 0
+++ exited with 0 +++
# grep /tmp /proc/self/mountinfo
24 15 0:22 / /tmp rw,noexec,relatime - tmpfs /tmp rw

- -- System Information:
Debian Release: jessie/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 3.17.0-rc7 (SMP w/4 CPU cores)
Locale: LANG=ja_JP.eucJP, LC_CTYPE=ja_JP.eucJP (charmap=EUC-JP)
Shell: /bin/sh linked to /bin/dash

Versions of packages mount depends on:
ii  libc6          2.19-11
ii  libmount1      2.25.1-3
ii  libselinux1    2.3-2
ii  libsmartcols1  2.25.1-3

mount recommends no packages.

Versions of packages mount suggests:
pn  nfs-common  <none>

- -- no debconf information



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