linux-kernel - Re: [PATCH v2 3/6] 9p: Replace the fidlist with an IDR

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20180712111726.GA17774@nautica>
Date:   Thu, 12 Jul 2018 13:17:26 +0200
From:   Dominique Martinet <asmadeus@...ewreck.org>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     v9fs-developer@...ts.sourceforge.net,
        Latchesar Ionkov <lucho@...kov.net>,
        Eric Van Hensbergen <ericvh@...il.com>,
        Ron Minnich <rminnich@...dia.gov>,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH v2 3/6] 9p: Replace the fidlist with an IDR

Matthew Wilcox wrote on Wed, Jul 11, 2018:
> diff --git a/net/9p/client.c b/net/9p/client.c
> index 389a2904b7b3..b89c7298267c 100644
> --- a/net/9p/client.c
> +++ b/net/9p/client.c
> @@ -908,30 +908,29 @@ static struct p9_fid *p9_fid_create(struct p9_client *clnt)
>  {
>  	int ret;
>  	struct p9_fid *fid;
> -	unsigned long flags;
>  
>  	p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt);
>  	fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
>  	if (!fid)
>  		return NULL;
>  
> -	ret = p9_idpool_get(clnt->fidpool);
> -	if (ret < 0)
> -		goto error;
> -	fid->fid = ret;
> -
>  	memset(&fid->qid, 0, sizeof(struct p9_qid));

Ah, I had missed that you didn't update this memset as you said in reply
to comment on v1.

Could you resend just this patch and either initialize fid->fid or use
kzalloc for the fid allocation?

>  	fid->mode = -1;
>  	fid->uid = current_fsuid();
>  	fid->clnt = clnt;
>  	fid->rdir = NULL;
> -	spin_lock_irqsave(&clnt->lock, flags);
> -	list_add(&fid->flist, &clnt->fidlist);
> -	spin_unlock_irqrestore(&clnt->lock, flags);
> +	fid->fid = 0;
>  
> -	return fid;
> +	idr_preload(GFP_KERNEL);
> +	spin_lock_irq(&clnt->lock);
> +	ret = idr_alloc_u32(&clnt->fids, fid, &fid->fid, P9_NOFID - 1,
> +			GFP_NOWAIT);

If you do resend, alignment here was wrong.


Thanks,
-- 
Dominique Martinet