* Fwd: Bug#764331: mount: "mount --bind -o remount" doesn't preserve flags
[not found] <5433bec30004719200003ea0000046dea00002d646a1@amlmta037.auone-net.jp>
@ 2014-10-07 13:59 ` Phillip Susi
2014-10-14 13:11 ` Karel Zak
2014-10-17 6:56 ` Karel Zak
0 siblings, 2 replies; 3+ messages in thread
From: Phillip Susi @ 2014-10-07 13:59 UTC (permalink / raw)
To: util-linux
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
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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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Fwd: Bug#764331: mount: "mount --bind -o remount" doesn't preserve flags
2014-10-07 13:59 ` Fwd: Bug#764331: mount: "mount --bind -o remount" doesn't preserve flags Phillip Susi
@ 2014-10-14 13:11 ` Karel Zak
2014-10-17 6:56 ` Karel Zak
1 sibling, 0 replies; 3+ messages in thread
From: Karel Zak @ 2014-10-14 13:11 UTC (permalink / raw)
To: Phillip Susi; +Cc: util-linux
On Tue, Oct 07, 2014 at 09:59:09AM -0400, Phillip Susi wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> 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?
Seems like a bug, I'll try to play with that tomorrow. Thanks!
Karel
--
Karel Zak <kzak@redhat.com>
http://karelzak.blogspot.com
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Fwd: Bug#764331: mount: "mount --bind -o remount" doesn't preserve flags
2014-10-07 13:59 ` Fwd: Bug#764331: mount: "mount --bind -o remount" doesn't preserve flags Phillip Susi
2014-10-14 13:11 ` Karel Zak
@ 2014-10-17 6:56 ` Karel Zak
1 sibling, 0 replies; 3+ messages in thread
From: Karel Zak @ 2014-10-17 6:56 UTC (permalink / raw)
To: Phillip Susi; +Cc: util-linux
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@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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> --
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>
--
Karel Zak <kzak@redhat.com>
http://karelzak.blogspot.com
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2014-10-17 6:56 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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[not found] <5433bec30004719200003ea0000046dea00002d646a1@amlmta037.auone-net.jp>
2014-10-07 13:59 ` Fwd: Bug#764331: mount: "mount --bind -o remount" doesn't preserve flags Phillip Susi
2014-10-14 13:11 ` Karel Zak
2014-10-17 6:56 ` Karel Zak
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