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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@xxxxxxxxxxxxxxx>
Resent-To: debian-bugs-dist@xxxxxxxxxxxxxxxx
Resent-CC: Debian util-linux Maintainers <ah-util-linux@xxxxxxxxxx>
Date: Tue, 07 Oct 2014 10:21:55 +0000
From: Kusanagi Kouichi <slash@xxxxxxxxxxxxxxx>
Reply-To: Kusanagi Kouichi <slash@xxxxxxxxxxxxxxx>, 764331@xxxxxxxxxxxxxxx
To: Debian Bug Tracking System <submit@xxxxxxxxxxxxxxx>
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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