linux-toradex.git/drivers/xen/xenfs, branch v4.9.97

xen: audit usages of module.h ; remove unnecessary instances

2016-03-21T15:13:32+00:00

Code that uses no modular facilities whatsoever should not be
sourcing module.h at all, since that header drags in a bunch
of other headers with it.

Similarly, code that is not explicitly using modular facilities
like module_init() but only is declaring module_param setup
variables should be using moduleparam.h and not the larger
module.h file for that.

In making this change, we also uncover an implicit use of BUG()
in inline fcns within arch/arm/include/asm/xen/hypercall.h so
we explicitly source  for that file now.

Signed-off-by: Paul Gortmaker 
Reviewed-by: Stefano Stabellini 
Signed-off-by: David Vrabel

xen: rename dom0_op to platform_op

2015-12-21T14:40:55+00:00

The dom0_op hypercall has been renamed to platform_op since Xen 3.2,
which is ancient, and modern upstream Linux kernels cannot run as dom0
and it anymore anyway.

Signed-off-by: Stefano Stabellini 
Reviewed-by: Boris Ostrovsky

xen: xensyms support

2015-08-20T11:24:25+00:00

Export Xen symbols to dom0 via /proc/xen/xensyms (similar to
/proc/kallsyms).

Signed-off-by: Boris Ostrovsky 
Reviewed-by: David Vrabel 
Signed-off-by: David Vrabel

xen: Convert printks to pr_

2013-06-28T15:19:58+00:00

Convert printks to pr_ (excludes printk(KERN_DEBUG...)
to be more consistent throughout the xen subsystem.

Add pr_fmt with KBUILD_MODNAME or "xen:" KBUILD_MODNAME
Coalesce formats and add missing word spaces
Add missing newlines
Align arguments and reflow to 80 columns
Remove DRV_NAME from formats as pr_fmt adds the same content

This does change some of the prefixes of these messages
but it also does make them more consistent.

Signed-off-by: Joe Perches 
Signed-off-by: Konrad Rzeszutek Wilk

fs: Limit sys_mount to only request filesystem modules.

2013-03-04T03:36:31+00:00

Modify the request_module to prefix the file system type with "fs-"
and add aliases to all of the filesystems that can be built as modules
to match.

A common practice is to build all of the kernel code and leave code
that is not commonly needed as modules, with the result that many
users are exposed to any bug anywhere in the kernel.

Looking for filesystems with a fs- prefix limits the pool of possible
modules that can be loaded by mount to just filesystems trivially
making things safer with no real cost.

Using aliases means user space can control the policy of which
filesystem modules are auto-loaded by editing /etc/modprobe.d/*.conf
with blacklist and alias directives.  Allowing simple, safe,
well understood work-arounds to known problematic software.

This also addresses a rare but unfortunate problem where the filesystem
name is not the same as it's module name and module auto-loading
would not work.  While writing this patch I saw a handful of such
cases.  The most significant being autofs that lives in the module
autofs4.

This is relevant to user namespaces because we can reach the request
module in get_fs_type() without having any special permissions, and
people get uncomfortable when a user specified string (in this case
the filesystem type) goes all of the way to request_module.

After having looked at this issue I don't think there is any
particular reason to perform any filtering or permission checks beyond
making it clear in the module request that we want a filesystem
module.  The common pattern in the kernel is to call request_module()
without regards to the users permissions.  In general all a filesystem
module does once loaded is call register_filesystem() and go to sleep.
Which means there is not much attack surface exposed by loading a
filesytem module unless the filesystem is mounted.  In a user
namespace filesystems are not mounted unless .fs_flags = FS_USERNS_MOUNT,
which most filesystems do not set today.

Acked-by: Serge Hallyn 
Acked-by: Kees Cook 
Reported-by: Kees Cook 
Signed-off-by: "Eric W. Biederman"

xenfs: switch to pure simple_fill_super()

2013-02-23T04:31:37+00:00

Signed-off-by: Al Viro

userns: Convert xenfs to use kuid and kgid where appropriate

2012-09-21T10:13:06+00:00

Cc: Ian Campbell 
Cc: Konrad Rzeszutek Wilk 
Acked-by: Serge Hallyn 
Signed-off-by: Eric W. Biederman

xen: Add xenbus device driver

2011-12-16T18:29:39+00:00

Access to xenbus is currently handled via xenfs. This adds a device
driver for xenbus and makes xenfs use this code.

Signed-off-by: Bastian Blank 
Acked-by: Ian Campbell 
Signed-off-by: Konrad Rzeszutek Wilk

xen: Add privcmd device driver

2011-12-16T18:29:31+00:00

Access to arbitrary hypercalls is currently provided via xenfs. This
adds a standard character device to handle this. The support in xenfs
remains for backward compatibility and uses the device driver code.

Signed-off-by: Bastian Blank 
Acked-by: Ian Campbell 
Signed-off-by: Konrad Rzeszutek Wilk

Merge branch 'xen/xenbus' of git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen

2011-01-21T00:37:28+00:00

* 'xen/xenbus' of git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen:
  xenbus: Fix memory leak on release
  xenbus: avoid zero returns from read()
  xenbus: add missing wakeup in concurrent read/write
  xenbus: allow any xenbus command over /proc/xen/xenbus
  xenfs/xenbus: report partial reads/writes correctly