linux-kernel - Re: [PATCH 2/2] jffs2: Provide jffs2_sync files to track gc POLL progress

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: <20180720000431.GA30522@ZenIV.linux.org.uk>
Date:   Fri, 20 Jul 2018 01:04:31 +0100
From:   Al Viro <viro@...IV.linux.org.uk>
To:     Theuns Verwoerd <theuns.verwoerd@...iedtelesis.co.nz>
Cc:     dwmw2@...radead.org, linux-mtd@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] jffs2: Provide jffs2_sync files to track gc POLL
 progress

On Fri, Jul 20, 2018 at 11:50:12AM +1200, Theuns Verwoerd wrote:

> +ssize_t jffs2_sync_file_read(struct file *f,
> +	      char __user *b, size_t len, loff_t *ofs)
> +{
> +	struct jffs2_sb_info *c = file_inode(f)->i_private;
> +
> +	while (c->tidemark)
> +		schedule();
> +
> +	return 0;
> +}

Brilliant.  So when that gets called with c->tidemark being true and
need_resched() - false, we shall...

Bonus question: what happens if that is called after that jffs2_sb_info
gets freed?

--
It Doesn't Need To Make Sense - It's For Security Purposes.