linux-kernel - Re: [RFC v5][PATCH 8/8] Dump open file descriptors

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: <1221584113.20360.16.camel@nimitz>
Date:	Tue, 16 Sep 2008 09:55:13 -0700
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	Oren Laadan <orenl@...columbia.edu>
Cc:	containers@...ts.linux-foundation.org, jeremy@...p.org,
	linux-kernel@...r.kernel.org, arnd@...db.de
Subject: Re: [RFC v5][PATCH 8/8] Dump open file descriptors

On Sat, 2008-09-13 at 19:06 -0400, Oren Laadan wrote:
> +/* cr_write_fd_data - dump the state of a given file pointer */
> +static int cr_write_fd_data(struct cr_ctx *ctx, struct file *file, int parent)
> +{
> +	struct cr_hdr h;
> +	struct cr_hdr_fd_data *hh = cr_hbuf_get(ctx, sizeof(*hh));
> +	struct dentry *dent = file->f_dentry;
> +	struct inode *inode = dent->d_inode;
> +	enum fd_type fd_type;
> +	int ret;
> +
> +	h.type = CR_HDR_FD_DATA;
> +	h.len = sizeof(*hh);
> +	h.parent = parent;
> +
> +	hh->f_flags = file->f_flags;
> +	hh->f_mode = file->f_mode;
> +	hh->f_pos = file->f_pos;
> +	hh->f_version = file->f_version;
> +	/* FIX: need also file->uid, file->gid, file->f_owner, etc */
> +
> +	switch (inode->i_mode & S_IFMT) {
> +	case S_IFREG:
> +		fd_type = CR_FD_FILE;
> +		break;
> +	case S_IFDIR:
> +		fd_type = CR_FD_DIR;
> +		break;
> +	case S_IFLNK:
> +		fd_type = CR_FD_LINK;
> +		break;
> +	default:
> +		return -EBADF;
> +	}
> +
> +	/* FIX: check if the file/dir/link is unlinked */
> +	hh->fd_type = fd_type;
> +
> +	ret = cr_write_obj(ctx, &h, hh);
> +	cr_hbuf_put(ctx, sizeof(*hh));
> +	if (ret < 0)
> +		return ret;
> +
> +	return cr_write_fname(ctx, &file->f_path, ctx->vfsroot);
> +}

One of the big things I'm looking for in these file patches is to make
sure that we can expand some day to lots of mounts and lots of
filesystem namespaces.

This tells me that we probably need a per-process vfsroot (which is also
a shared object).  We probably need to make a note in the task structure
as well as here.  

-- Dave

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/