[patch 02/10] unprivileged mounts: allow unprivileged umount
From: Miklos Szeredi <[EMAIL PROTECTED]>
The owner doesn't need sysadmin capabilities to call umount().
Similar behavior as umount(8) on mounts having "user=UID" option in /etc/mtab.
The difference is that umount also checks /etc/fstab, presumably to exclude
another mount on the same mountpoint.
Signed-off-by: Miklos Szeredi <[EMAIL PROTECTED]>
Acked-by: Serge Hallyn <[EMAIL PROTECTED]>
---
Index: linux/fs/namespace.c
===
--- linux.orig/fs/namespace.c 2008-02-04 23:47:50.0 +0100
+++ linux/fs/namespace.c2008-02-04 23:47:53.0 +0100
@@ -1033,6 +1033,27 @@ static int do_umount(struct vfsmount *mn
return retval;
}
+static bool is_mount_owner(struct vfsmount *mnt, uid_t uid)
+{
+ return (mnt->mnt_flags & MNT_USER) && mnt->mnt_uid == uid;
+}
+
+/*
+ * umount is permitted for
+ * - sysadmin
+ * - mount owner, if not forced umount
+ */
+static bool permit_umount(struct vfsmount *mnt, int flags)
+{
+ if (capable(CAP_SYS_ADMIN))
+ return true;
+
+ if (flags & MNT_FORCE)
+ return false;
+
+ return is_mount_owner(mnt, current->fsuid);
+}
+
/*
* Now umount can handle mount points as well as block devices.
* This is important for filesystems which use unnamed block devices.
@@ -1056,7 +1077,7 @@ asmlinkage long sys_umount(char __user *
goto dput_and_out;
retval = -EPERM;
- if (!capable(CAP_SYS_ADMIN))
+ if (!permit_umount(nd.path.mnt, flags))
goto dput_and_out;
retval = do_umount(nd.path.mnt, flags);
--
--
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[patch 02/10] unprivileged mounts: allow unprivileged umount
From: Miklos Szeredi [EMAIL PROTECTED]
The owner doesn't need sysadmin capabilities to call umount().
Similar behavior as umount(8) on mounts having user=UID option in /etc/mtab.
The difference is that umount also checks /etc/fstab, presumably to exclude
another mount on the same mountpoint.
Signed-off-by: Miklos Szeredi [EMAIL PROTECTED]
Acked-by: Serge Hallyn [EMAIL PROTECTED]
---
Index: linux/fs/namespace.c
===
--- linux.orig/fs/namespace.c 2008-02-04 23:47:50.0 +0100
+++ linux/fs/namespace.c2008-02-04 23:47:53.0 +0100
@@ -1033,6 +1033,27 @@ static int do_umount(struct vfsmount *mn
return retval;
}
+static bool is_mount_owner(struct vfsmount *mnt, uid_t uid)
+{
+ return (mnt-mnt_flags MNT_USER) mnt-mnt_uid == uid;
+}
+
+/*
+ * umount is permitted for
+ * - sysadmin
+ * - mount owner, if not forced umount
+ */
+static bool permit_umount(struct vfsmount *mnt, int flags)
+{
+ if (capable(CAP_SYS_ADMIN))
+ return true;
+
+ if (flags MNT_FORCE)
+ return false;
+
+ return is_mount_owner(mnt, current-fsuid);
+}
+
/*
* Now umount can handle mount points as well as block devices.
* This is important for filesystems which use unnamed block devices.
@@ -1056,7 +1077,7 @@ asmlinkage long sys_umount(char __user *
goto dput_and_out;
retval = -EPERM;
- if (!capable(CAP_SYS_ADMIN))
+ if (!permit_umount(nd.path.mnt, flags))
goto dput_and_out;
retval = do_umount(nd.path.mnt, flags);
--
--
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the body of a message to [EMAIL PROTECTED]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[patch 02/10] unprivileged mounts: allow unprivileged umount
From: Miklos Szeredi <[EMAIL PROTECTED]>
The owner doesn't need sysadmin capabilities to call umount().
Similar behavior as umount(8) on mounts having "user=UID" option in /etc/mtab.
The difference is that umount also checks /etc/fstab, presumably to exclude
another mount on the same mountpoint.
Signed-off-by: Miklos Szeredi <[EMAIL PROTECTED]>
Acked-by: Serge Hallyn <[EMAIL PROTECTED]>
---
Index: linux/fs/namespace.c
===
--- linux.orig/fs/namespace.c 2008-01-16 13:25:05.0 +0100
+++ linux/fs/namespace.c2008-01-16 13:25:06.0 +0100
@@ -894,6 +894,27 @@ static int do_umount(struct vfsmount *mn
return retval;
}
+static bool is_mount_owner(struct vfsmount *mnt, uid_t uid)
+{
+ return (mnt->mnt_flags & MNT_USER) && mnt->mnt_uid == uid;
+}
+
+/*
+ * umount is permitted for
+ * - sysadmin
+ * - mount owner, if not forced umount
+ */
+static bool permit_umount(struct vfsmount *mnt, int flags)
+{
+ if (capable(CAP_SYS_ADMIN))
+ return true;
+
+ if (flags & MNT_FORCE)
+ return false;
+
+ return is_mount_owner(mnt, current->fsuid);
+}
+
/*
* Now umount can handle mount points as well as block devices.
* This is important for filesystems which use unnamed block devices.
@@ -917,7 +938,7 @@ asmlinkage long sys_umount(char __user *
goto dput_and_out;
retval = -EPERM;
- if (!capable(CAP_SYS_ADMIN))
+ if (!permit_umount(nd.path.mnt, flags))
goto dput_and_out;
retval = do_umount(nd.path.mnt, flags);
--
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [EMAIL PROTECTED]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[patch 02/10] unprivileged mounts: allow unprivileged umount
From: Miklos Szeredi [EMAIL PROTECTED]
The owner doesn't need sysadmin capabilities to call umount().
Similar behavior as umount(8) on mounts having user=UID option in /etc/mtab.
The difference is that umount also checks /etc/fstab, presumably to exclude
another mount on the same mountpoint.
Signed-off-by: Miklos Szeredi [EMAIL PROTECTED]
Acked-by: Serge Hallyn [EMAIL PROTECTED]
---
Index: linux/fs/namespace.c
===
--- linux.orig/fs/namespace.c 2008-01-16 13:25:05.0 +0100
+++ linux/fs/namespace.c2008-01-16 13:25:06.0 +0100
@@ -894,6 +894,27 @@ static int do_umount(struct vfsmount *mn
return retval;
}
+static bool is_mount_owner(struct vfsmount *mnt, uid_t uid)
+{
+ return (mnt-mnt_flags MNT_USER) mnt-mnt_uid == uid;
+}
+
+/*
+ * umount is permitted for
+ * - sysadmin
+ * - mount owner, if not forced umount
+ */
+static bool permit_umount(struct vfsmount *mnt, int flags)
+{
+ if (capable(CAP_SYS_ADMIN))
+ return true;
+
+ if (flags MNT_FORCE)
+ return false;
+
+ return is_mount_owner(mnt, current-fsuid);
+}
+
/*
* Now umount can handle mount points as well as block devices.
* This is important for filesystems which use unnamed block devices.
@@ -917,7 +938,7 @@ asmlinkage long sys_umount(char __user *
goto dput_and_out;
retval = -EPERM;
- if (!capable(CAP_SYS_ADMIN))
+ if (!permit_umount(nd.path.mnt, flags))
goto dput_and_out;
retval = do_umount(nd.path.mnt, flags);
--
--
To unsubscribe from this list: send the line unsubscribe linux-kernel in
the body of a message to [EMAIL PROTECTED]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[patch 02/10] unprivileged mounts: allow unprivileged umount
From: Miklos Szeredi <[EMAIL PROTECTED]>
The owner doesn't need sysadmin capabilities to call umount().
Similar behavior as umount(8) on mounts having "user=UID" option in /etc/mtab.
The difference is that umount also checks /etc/fstab, presumably to exclude
another mount on the same mountpoint.
Signed-off-by: Miklos Szeredi <[EMAIL PROTECTED]>
---
Index: linux/fs/namespace.c
===
--- linux.orig/fs/namespace.c 2007-04-26 13:10:48.0 +0200
+++ linux/fs/namespace.c2007-04-26 13:16:21.0 +0200
@@ -658,6 +658,27 @@ static int do_umount(struct vfsmount *mn
return retval;
}
+static bool is_mount_owner(struct vfsmount *mnt, uid_t uid)
+{
+ return (mnt->mnt_flags & MNT_USER) && mnt->mnt_uid == uid;
+}
+
+/*
+ * umount is permitted for
+ * - sysadmin
+ * - mount owner, if not forced umount
+ */
+static bool permit_umount(struct vfsmount *mnt, int flags)
+{
+ if (capable(CAP_SYS_ADMIN))
+ return true;
+
+ if (flags & MNT_FORCE)
+ return false;
+
+ return is_mount_owner(mnt, current->fsuid);
+}
+
/*
* Now umount can handle mount points as well as block devices.
* This is important for filesystems which use unnamed block devices.
@@ -681,7 +702,7 @@ asmlinkage long sys_umount(char __user *
goto dput_and_out;
retval = -EPERM;
- if (!capable(CAP_SYS_ADMIN))
+ if (!permit_umount(nd.mnt, flags))
goto dput_and_out;
retval = do_umount(nd.mnt, flags);
--
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [EMAIL PROTECTED]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[patch 02/10] unprivileged mounts: allow unprivileged umount
From: Miklos Szeredi [EMAIL PROTECTED]
The owner doesn't need sysadmin capabilities to call umount().
Similar behavior as umount(8) on mounts having user=UID option in /etc/mtab.
The difference is that umount also checks /etc/fstab, presumably to exclude
another mount on the same mountpoint.
Signed-off-by: Miklos Szeredi [EMAIL PROTECTED]
---
Index: linux/fs/namespace.c
===
--- linux.orig/fs/namespace.c 2007-04-26 13:10:48.0 +0200
+++ linux/fs/namespace.c2007-04-26 13:16:21.0 +0200
@@ -658,6 +658,27 @@ static int do_umount(struct vfsmount *mn
return retval;
}
+static bool is_mount_owner(struct vfsmount *mnt, uid_t uid)
+{
+ return (mnt-mnt_flags MNT_USER) mnt-mnt_uid == uid;
+}
+
+/*
+ * umount is permitted for
+ * - sysadmin
+ * - mount owner, if not forced umount
+ */
+static bool permit_umount(struct vfsmount *mnt, int flags)
+{
+ if (capable(CAP_SYS_ADMIN))
+ return true;
+
+ if (flags MNT_FORCE)
+ return false;
+
+ return is_mount_owner(mnt, current-fsuid);
+}
+
/*
* Now umount can handle mount points as well as block devices.
* This is important for filesystems which use unnamed block devices.
@@ -681,7 +702,7 @@ asmlinkage long sys_umount(char __user *
goto dput_and_out;
retval = -EPERM;
- if (!capable(CAP_SYS_ADMIN))
+ if (!permit_umount(nd.mnt, flags))
goto dput_and_out;
retval = do_umount(nd.mnt, flags);
--
-
To unsubscribe from this list: send the line unsubscribe linux-kernel in
the body of a message to [EMAIL PROTECTED]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
