Subject: + initmpfs-replace-ms_nouser-in-initramfs.patch added to -mm tree
To: rob@xxxxxxxxxxx,axboe@xxxxxxxxx,ebiederm@xxxxxxxxxxxx,gregkh@xxxxxxxxxxxxxxxxxxx,hpa@xxxxxxxxx,jim.cromie@xxxxxxxxx,jlayton@xxxxxxxxxx,rusty@xxxxxxxxxxxxxxx,sam@xxxxxxxxxxxx,swarren@xxxxxxxxxx,viro@xxxxxxxxxxxxxxxxxx
From: akpm@xxxxxxxxxxxxxxxxxxxx
Date: Fri, 19 Jul 2013 12:57:47 -0700
The patch titled
Subject: initmpfs: replace MS_NOUSER in initramfs
has been added to the -mm tree. Its filename is
initmpfs-replace-ms_nouser-in-initramfs.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/initmpfs-replace-ms_nouser-in-initramfs.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/initmpfs-replace-ms_nouser-in-initramfs.patch
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------------------------------------------------------
From: Rob Landley <rob@xxxxxxxxxxx>
Subject: initmpfs: replace MS_NOUSER in initramfs
Mounting MS_NOUSER prevents --bind mounts from rootfs. Prevent new rootfs
mounts with a different mechanism that doesn't affect bind mounts.
Signed-off-by: Rob Landley <rob@xxxxxxxxxxx>
Cc: Jeff Layton <jlayton@xxxxxxxxxx>
Cc: Jens Axboe <axboe@xxxxxxxxx>
Cc: Stephen Warren <swarren@xxxxxxxxxx>
Cc: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
Cc: Jim Cromie <jim.cromie@xxxxxxxxx>
Cc: Sam Ravnborg <sam@xxxxxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
Cc: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/ramfs/inode.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff -puN fs/ramfs/inode.c~initmpfs-replace-ms_nouser-in-initramfs fs/ramfs/inode.c
--- a/fs/ramfs/inode.c~initmpfs-replace-ms_nouser-in-initramfs
+++ a/fs/ramfs/inode.c
@@ -247,7 +247,12 @@ struct dentry *ramfs_mount(struct file_s
static struct dentry *rootfs_mount(struct file_system_type *fs_type,
int flags, const char *dev_name, void *data)
{
- return mount_nodev(fs_type, flags|MS_NOUSER, data, ramfs_fill_super);
+ static unsigned long once;
+
+ if (test_and_set_bit(1, &once))
+ return ERR_PTR(-ENODEV);
+
+ return mount_nodev(fs_type, flags, data, ramfs_fill_super);
}
static void ramfs_kill_sb(struct super_block *sb)
_
Patches currently in -mm which might be from rob@xxxxxxxxxxx are
x86-make-mem=-option-to-work-for-efi-platform.patch
initmpfs-replace-ms_nouser-in-initramfs.patch
initmpfs-move-bdi-setup-from-init_rootfs-to-init_ramfs.patch
initmpfs-move-bdi-setup-from-init_rootfs-to-init_ramfs-fix.patch
initmpfs-move-rootfs-code-from-fs-ramfs-to-init.patch
initmpfs-make-rootfs-use-tmpfs-when-config_tmpfs-enabled.patch
initmpfs-use-initramfs-if-rootfstype=-or-root=-specified.patch
--
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