I have take an snapshot of my development tree and placed it at.
git://git.kernel.org/pub/scm/linux/people/ebiederm/linux-2.6.33-nsfd-v5.git
>> I am going to explore a bit more. Given that nsfd is using the same
>> permission checks as a proc file, I think I can just make it a proc
>> file. Something like "/proc/<pid>/ns/net". With a little luck that
>> won't suck too badly.
>>
> Ah ! yes. Good idea.
It is a hair more code to use proc files but nothing worth counting.
Probably the biggest thing I am aware of right now in my development
tree is in getting uids to pass properly between unix domain sockets
I would up writing this cred_to_ucred function.
Serge can you take a look and check my logic, and do you have
any idea of where we should place something like pid_vnr but
for the uid namespace?
void cred_to_ucred(struct pid *pid, const struct cred *cred,
struct ucred *ucred)
{
ucred->pid = pid_vnr(pid);
ucred->uid = ucred->gid = -1;
if (cred) {
struct user_namespace *cred_ns = cred->user->user_ns;
struct user_namespace *current_ns = current_user_ns();
struct user_namespace *tmp;
if (likely(cred_ns == current_ns)) {
ucred->uid = cred->euid;
ucred->gid = cred->egid;
} else {
/* Is cred in a child user namespace */
tmp = cred_ns;
do {
tmp = tmp->creator->user_ns;
if (tmp == current_ns) {
ucred->uid = tmp->creator->uid;
ucred->gid = overflowgid;
return;
}
} while (tmp != &init_user_ns);
/* Is cred the creator of my user namespace,
* or the creator of one of it's parents?
*/
for( tmp = current_ns; tmp != &init_user_ns;
tmp = tmp->creator->user_ns) {
if (cred->user == tmp->creator) {
ucred->uid = 0;
ucred->gid = 0;
return;
}
}
/* No user namespace relationship so no mapping */
ucred->uid = overflowuid;
ucred->gid = overflowgid;
}
}
}
Eric
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