From: Jan Beulich <jbeulich@suse.com>
To: Juergen Gross <jgross@suse.com>
Cc: "Stefano Stabellini" <sstabellini@kernel.org>,
"Julien Grall" <julien@xen.org>, "Wei Liu" <wl@xen.org>,
"Konrad Rzeszutek Wilk" <konrad.wilk@oracle.com>,
"Andrew Cooper" <andrew.cooper3@citrix.com>,
"Ian Jackson" <ian.jackson@eu.citrix.com>,
"George Dunlap" <george.dunlap@citrix.com>,
xen-devel@lists.xenproject.org,
"Daniel De Graaf" <dgdegra@tycho.nsa.gov>,
"Volodymyr Babchuk" <Volodymyr_Babchuk@epam.com>,
"Roger Pau Monné" <roger.pau@citrix.com>
Subject: Re: [Xen-devel] [PATCH v6 04/12] xen: add basic hypervisor filesystem support
Date: Tue, 3 Mar 2020 17:59:36 +0100 [thread overview]
Message-ID: <b9398158-4f27-b0e0-f3e3-12eb398dd616@suse.com> (raw)
In-Reply-To: <20200226124705.29212-5-jgross@suse.com>
On 26.02.2020 13:46, Juergen Gross wrote:
> --- /dev/null
> +++ b/xen/common/hypfs.c
> @@ -0,0 +1,349 @@
> +/******************************************************************************
> + *
> + * hypfs.c
> + *
> + * Simple sysfs-like file system for the hypervisor.
> + */
> +
> +#include <xen/err.h>
> +#include <xen/guest_access.h>
> +#include <xen/hypercall.h>
> +#include <xen/hypfs.h>
> +#include <xen/lib.h>
> +#include <xen/rwlock.h>
> +#include <public/hypfs.h>
> +
> +#ifdef CONFIG_COMPAT
> +#include <compat/hypfs.h>
> +CHECK_hypfs_direntry;
> +#undef CHECK_hypfs_direntry
> +#define CHECK_hypfs_direntry struct xen_hypfs_direntry
I'm struggling to see why you need this #undef and #define.
> +int hypfs_write_leaf(struct hypfs_entry_leaf *leaf,
> + XEN_GUEST_HANDLE_PARAM(void) uaddr, unsigned long ulen)
> +{
> + char *buf;
> + int ret;
> +
> + if ( ulen > leaf->e.size )
> + return -ENOSPC;
> +
> + if ( leaf->e.type != XEN_HYPFS_TYPE_STRING &&
> + leaf->e.type != XEN_HYPFS_TYPE_BLOB && ulen != leaf->e.size )
> + return -EDOM;
Why the exception of string and blob? My concern about the
meaning of a partially written entry (without its size having
changed) remains.
> + buf = xmalloc_array(char, ulen);
> + if ( !buf )
> + return -ENOMEM;
> +
> + ret = -EFAULT;
> + if ( copy_from_guest(buf, uaddr, ulen) )
> + goto out;
> +
> + ret = -EINVAL;
> + if ( leaf->e.type == XEN_HYPFS_TYPE_STRING && !memchr(buf, 0, ulen) )
This should also use the != buf + ulen - 1 form imo.
Jan
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next prev parent reply other threads:[~2020-03-03 17:00 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-26 12:46 [Xen-devel] [PATCH v6 00/12] Add hypervisor sysfs-like support Juergen Gross
2020-02-26 12:46 ` [Xen-devel] [PATCH v6 01/12] xen: allow only sizeof(bool) variables for boolean_param() Juergen Gross
2020-03-03 16:40 ` Jan Beulich
2020-03-09 11:43 ` Julien Grall
2020-03-09 11:55 ` Jan Beulich
2020-03-09 13:01 ` Jürgen Groß
2020-03-09 13:06 ` Jan Beulich
2020-03-09 14:06 ` Jürgen Groß
2020-02-26 12:46 ` [Xen-devel] [PATCH v6 02/12] xen: add a generic way to include binary files as variables Juergen Gross
2020-02-26 12:46 ` [Xen-devel] [PATCH v6 03/12] docs: add feature document for Xen hypervisor sysfs-like support Juergen Gross
2020-03-09 11:48 ` Julien Grall
2020-03-25 14:05 ` Jürgen Groß
2020-02-26 12:46 ` [Xen-devel] [PATCH v6 04/12] xen: add basic hypervisor filesystem support Juergen Gross
2020-03-03 16:59 ` Jan Beulich [this message]
2020-03-04 12:00 ` Jürgen Groß
2020-03-04 13:03 ` Jan Beulich
2020-03-04 14:39 ` Jürgen Groß
2020-03-04 15:07 ` Jan Beulich
2020-03-04 15:14 ` Jürgen Groß
2020-03-04 15:21 ` Jan Beulich
2020-03-06 6:06 ` Jürgen Groß
2020-03-06 8:19 ` Jan Beulich
2020-02-26 12:46 ` [Xen-devel] [PATCH v6 05/12] libs: add libxenhypfs Juergen Gross
2020-02-26 12:46 ` [Xen-devel] [PATCH v6 06/12] tools: add xenfs tool Juergen Gross
2020-02-26 12:47 ` [Xen-devel] [PATCH v6 07/12] xen: provide version information in hypfs Juergen Gross
2020-02-26 12:47 ` [Xen-devel] [PATCH v6 08/12] xen: add /buildinfo/config entry to hypervisor filesystem Juergen Gross
2020-03-04 10:49 ` Jan Beulich
2020-03-04 12:06 ` Jürgen Groß
2020-03-04 13:04 ` Jan Beulich
2020-02-26 12:47 ` [Xen-devel] [PATCH v6 09/12] xen: add runtime parameter access support to hypfs Juergen Gross
2020-03-04 11:32 ` Jan Beulich
2020-03-04 15:07 ` Jürgen Groß
2020-03-04 15:19 ` Jan Beulich
2020-03-04 16:31 ` Jürgen Groß
2020-03-04 16:56 ` Jan Beulich
2020-03-05 6:01 ` Jürgen Groß
2020-03-05 8:26 ` Jan Beulich
2020-03-06 6:42 ` Jürgen Groß
2020-03-06 8:20 ` Jan Beulich
2020-03-06 8:47 ` Jürgen Groß
2020-03-06 9:04 ` Jan Beulich
2020-03-06 9:20 ` Jürgen Groß
2020-03-06 9:22 ` Jan Beulich
2020-03-06 9:27 ` Jürgen Groß
2020-03-23 10:38 ` Julien Grall
2020-02-26 12:47 ` [Xen-devel] [PATCH v6 10/12] tools/libxl: use libxenhypfs for setting xen runtime parameters Juergen Gross
2020-02-26 12:47 ` [Xen-devel] [PATCH v6 11/12] tools/libxc: remove xc_set_parameters() Juergen Gross
2020-02-26 12:47 ` [Xen-devel] [PATCH v6 12/12] xen: remove XEN_SYSCTL_set_parameter support Juergen Gross
2020-03-04 11:45 ` Jan Beulich
2020-03-04 14:40 ` Jürgen Groß
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