On Tue, Oct 07, 2014 at 09:59:09AM -0400, Phillip Susi wrote:
> 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?
It only happens when you use "--bind" rather than "-o bind".
# strace -e mount ./mount -o bind,remount,nosuid /mnt/test
mount("/dev/sdb", "/mnt/test", 0x225ad60, MS_NOSUID|MS_NOEXEC|MS_REMOUNT|MS_RELATIME|MS_BIND, "stripe=32") = 0
# strace -e mount ./mount --bind -o remount,nosuid /mnt/test
mount("none", "/mnt/test", 0x6d6240, MS_MGC_VAL|MS_NOSUID|MS_REMOUNT|MS_BIND, NULL) = 0
Fixed in git tree, will be in 2.25.2. Thanks!
Karel
>
>
> - -------- 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
>
>
>
> -----BEGIN PGP SIGNATURE-----
> Version: GnuPG v2.0.17 (MingW32)
>
> iQEcBAEBAgAGBQJUM/GtAAoJEI5FoCIzSKrwMt0IAJXE1nKf1Qul61ZGTp+8PrkP
> jECbRXXOAgzGniZc8M8ZoTLTbnPsbuvHjLNkhgBpha5o6a3lulEX4sOJq4uWp4wD
> zFLMKRIa4QxbKvvGlLUyulbmMju53GCZk2ZGXrP5YMMhlpQFhbbN1TTzpgbTrtSS
> 7939KUTfDUZozm1MbauQqP8/yweOcRN88SHplRT5M+547Fw21/954a8nY2+XwZS4
> mNcUpgnz/X6dMje9w3pkAYq/vxNtdtQ61J1IVXionWzBFjp0kVp2f+QNdADgqt06
> UpFltonLCiAbHfIhCGEeDM48d5r9xEV/AroszeKq3Xlq2Blyk1CP2/nMmF9cqoM=
> =nO6i
> -----END PGP SIGNATURE-----
> --
> To unsubscribe from this list: send the line "unsubscribe util-linux" in
> the body of a message to majordomo@xxxxxxxxxxxxxxx
> More majordomo info at http://vger.kernel.org/majordomo-info.html
>
--
Karel Zak <kzak@xxxxxxxxxx>
http://karelzak.blogspot.com
--
To unsubscribe from this list: send the line "unsubscribe util-linux" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
