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[PATCH] unshare system call -v5: unshare namespace

Browse source 
If the namespace structure is being shared, allocate a new one and copy
information from the current, shared, structure.

Signed-off-by: Janak Desai <[email protected]>
Cc: Al Viro <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Michael Kerrisk <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Paul Mackerras <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
JANAK DESAI 2006-02-07 12:59:00 -08:00 • committed by Linus Torvalds
commit 741a295130
3 changed files with 48 additions and 26 deletions
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56
fs/namespace.c
View file

@ -1325,27 +1325,17 @@ dput_out:
return retval;
}
int copy_namespace(int flags, struct task_struct *tsk)
/*
* Allocate a new namespace structure and populate it with contents
* copied from the namespace of the passed in task structure.
*/
struct namespace *dup_namespace(struct task_struct *tsk, struct fs_struct *fs)
{
struct namespace *namespace = tsk->namespace;
struct namespace *new_ns;
struct vfsmount *rootmnt = NULL, *pwdmnt = NULL, *altrootmnt = NULL;
struct fs_struct *fs = tsk->fs;
struct vfsmount *p, *q;
if (!namespace)
return 0;
get_namespace(namespace);
if (!(flags & CLONE_NEWNS))
return 0;
if (!capable(CAP_SYS_ADMIN)) {
put_namespace(namespace);
return -EPERM;
}
new_ns = kmalloc(sizeof(struct namespace), GFP_KERNEL);
if (!new_ns)
goto out;
@ -1396,8 +1386,6 @@ int copy_namespace(int flags, struct task_struct *tsk)
}
up_write(&namespace_sem);
tsk->namespace = new_ns;
if (rootmnt)
mntput(rootmnt);
if (pwdmnt)
@ -1405,12 +1393,40 @@ int copy_namespace(int flags, struct task_struct *tsk)
if (altrootmnt)
mntput(altrootmnt);
put_namespace(namespace);
return 0;
out:
return new_ns;
}
int copy_namespace(int flags, struct task_struct *tsk)
{
struct namespace *namespace = tsk->namespace;
struct namespace *new_ns;
int err = 0;
if (!namespace)
return 0;
get_namespace(namespace);
if (!(flags & CLONE_NEWNS))
return 0;
if (!capable(CAP_SYS_ADMIN)) {
err = -EPERM;
goto out;
}
new_ns = dup_namespace(tsk, tsk->fs);
if (!new_ns) {
err = -ENOMEM;
goto out;
}
tsk->namespace = new_ns;
out:
put_namespace(namespace);
return -ENOMEM;
return err;
}
asmlinkage long sys_mount(char __user * dev_name, char __user * dir_name,