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Date: Mon, 13 Feb 2017 17:03:23 +0000
From: Paul Durrant <paul.durrant@...rix.com>
To: <xen-devel@...ts.xenproject.org>, <linux-kernel@...r.kernel.org>
CC: Paul Durrant <paul.durrant@...rix.com>,
Boris Ostrovsky <boris.ostrovsky@...cle.com>,
Juergen Gross <jgross@...e.com>
Subject: [PATCH v3 2/3] xen/privcmd: Add IOCTL_PRIVCMD_DM_OP
Recently a new dm_op[1] hypercall was added to Xen to provide a mechanism
for restricting device emulators (such as QEMU) to a limited set of
hypervisor operations, and being able to audit those operations in the
kernel of the domain in which they run.
This patch adds IOCTL_PRIVCMD_DM_OP as gateway for __HYPERVISOR_dm_op.
NOTE: There is no requirement for user-space code to bounce data through
locked memory buffers (as with IOCTL_PRIVCMD_HYPERCALL) since
privcmd has enough information to lock the original buffers
directly.
[1] http://xenbits.xen.org/gitweb/?p=xen.git;a=commit;h=524a98c2
Signed-off-by: Paul Durrant <paul.durrant@...rix.com>
---
Cc: Boris Ostrovsky <boris.ostrovsky@...cle.com>
Cc: Juergen Gross <jgross@...e.com>
v3:
- Add module parameters for max number of dm_op buffers and max buffer
size
- Fix arm build
- Fix commit comment to reflect re-worked patch
v2:
- Lock the user pages rather than bouncing through kernel memory
---
arch/arm/xen/enlighten.c | 1 +
arch/arm/xen/hypercall.S | 1 +
arch/arm64/xen/hypercall.S | 1 +
arch/x86/include/asm/xen/hypercall.h | 7 ++
drivers/xen/privcmd.c | 139 +++++++++++++++++++++++++++++++++++
include/uapi/xen/privcmd.h | 13 ++++
include/xen/arm/hypercall.h | 1 +
include/xen/interface/hvm/dm_op.h | 32 ++++++++
include/xen/interface/xen.h | 1 +
9 files changed, 196 insertions(+)
create mode 100644 include/xen/interface/hvm/dm_op.h
diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c
index 11d9f28..81e3217 100644
--- a/arch/arm/xen/enlighten.c
+++ b/arch/arm/xen/enlighten.c
@@ -457,4 +457,5 @@ EXPORT_SYMBOL_GPL(HYPERVISOR_tmem_op);
EXPORT_SYMBOL_GPL(HYPERVISOR_platform_op);
EXPORT_SYMBOL_GPL(HYPERVISOR_multicall);
EXPORT_SYMBOL_GPL(HYPERVISOR_vm_assist);
+EXPORT_SYMBOL_GPL(HYPERVISOR_dm_op);
EXPORT_SYMBOL_GPL(privcmd_call);
diff --git a/arch/arm/xen/hypercall.S b/arch/arm/xen/hypercall.S
index a648dfc..b0b80c0 100644
--- a/arch/arm/xen/hypercall.S
+++ b/arch/arm/xen/hypercall.S
@@ -92,6 +92,7 @@ HYPERCALL1(tmem_op);
HYPERCALL1(platform_op_raw);
HYPERCALL2(multicall);
HYPERCALL2(vm_assist);
+HYPERCALL3(dm_op);
ENTRY(privcmd_call)
stmdb sp!, {r4}
diff --git a/arch/arm64/xen/hypercall.S b/arch/arm64/xen/hypercall.S
index 947830a..401ceb7 100644
--- a/arch/arm64/xen/hypercall.S
+++ b/arch/arm64/xen/hypercall.S
@@ -84,6 +84,7 @@ HYPERCALL1(tmem_op);
HYPERCALL1(platform_op_raw);
HYPERCALL2(multicall);
HYPERCALL2(vm_assist);
+HYPERCALL3(dm_op);
ENTRY(privcmd_call)
mov x16, x0
diff --git a/arch/x86/include/asm/xen/hypercall.h b/arch/x86/include/asm/xen/hypercall.h
index a12a047..f6d20f6 100644
--- a/arch/x86/include/asm/xen/hypercall.h
+++ b/arch/x86/include/asm/xen/hypercall.h
@@ -472,6 +472,13 @@ HYPERVISOR_xenpmu_op(unsigned int op, void *arg)
return _hypercall2(int, xenpmu_op, op, arg);
}
+static inline int
+HYPERVISOR_dm_op(
+ domid_t dom, unsigned int nr_bufs, void *bufs)
+{
+ return _hypercall3(int, dm_op, dom, nr_bufs, bufs);
+}
+
static inline void
MULTI_fpu_taskswitch(struct multicall_entry *mcl, int set)
{
diff --git a/drivers/xen/privcmd.c b/drivers/xen/privcmd.c
index 5e5c7ae..a33f17e 100644
--- a/drivers/xen/privcmd.c
+++ b/drivers/xen/privcmd.c
@@ -22,6 +22,7 @@
#include <linux/pagemap.h>
#include <linux/seq_file.h>
#include <linux/miscdevice.h>
+#include <linux/moduleparam.h>
#include <asm/pgalloc.h>
#include <asm/pgtable.h>
@@ -32,6 +33,7 @@
#include <xen/xen.h>
#include <xen/privcmd.h>
#include <xen/interface/xen.h>
+#include <xen/interface/hvm/dm_op.h>
#include <xen/features.h>
#include <xen/page.h>
#include <xen/xen-ops.h>
@@ -43,6 +45,17 @@ MODULE_LICENSE("GPL");
#define PRIV_VMA_LOCKED ((void *)1)
+unsigned int privcmd_dm_op_max_num = 16;
+module_param_named(dm_op_max_nr_bufs, privcmd_dm_op_max_num, uint, 0644);
+MODULE_PARM_DESC(dm_op_max_nr_bufs,
+ "Maximum number of buffers per dm_op hypercall");
+
+unsigned int privcmd_dm_op_buf_max_size = XEN_PAGE_SIZE;
+module_param_named(dm_op_buf_max_size, privcmd_dm_op_buf_max_size, uint,
+ 0644);
+MODULE_PARM_DESC(dm_op_buf_max_size,
+ "Maximum size of a dm_op hypercall buffer");
+
static int privcmd_vma_range_is_mapped(
struct vm_area_struct *vma,
unsigned long addr,
@@ -548,6 +561,128 @@ static long privcmd_ioctl_mmap_batch(void __user *udata, int version)
goto out;
}
+static int lock_pages(
+ struct privcmd_dm_op_buf kbufs[], unsigned int num,
+ struct page *pages[], unsigned int nr_pages)
+{
+ unsigned int i;
+
+ for (i = 0; i < num; i++) {
+ unsigned int requested;
+ int pinned;
+
+ requested = DIV_ROUND_UP(
+ offset_in_page(kbufs[i].uptr) + kbufs[i].size,
+ PAGE_SIZE);
+ if (requested > nr_pages)
+ return -ENOSPC;
+
+ pinned = get_user_pages_fast(
+ (unsigned long) kbufs[i].uptr,
+ requested, FOLL_WRITE, pages);
+ if (pinned < 0)
+ return pinned;
+
+ nr_pages -= pinned;
+ pages += pinned;
+ }
+
+ return 0;
+}
+
+static void unlock_pages(struct page *pages[], unsigned int nr_pages)
+{
+ unsigned int i;
+
+ if (!pages)
+ return;
+
+ for (i = 0; i < nr_pages; i++) {
+ if (pages[i])
+ put_page(pages[i]);
+ }
+}
+
+static long privcmd_ioctl_dm_op(void __user *udata)
+{
+ struct privcmd_dm_op kdata;
+ struct privcmd_dm_op_buf *kbufs;
+ unsigned int nr_pages = 0;
+ struct page **pages = NULL;
+ struct xen_dm_op_buf *xbufs = NULL;
+ unsigned int i;
+ long rc;
+
+ if (copy_from_user(&kdata, udata, sizeof(kdata)))
+ return -EFAULT;
+
+ if (kdata.num == 0)
+ return 0;
+
+ if (kdata.num > privcmd_dm_op_max_num)
+ return -E2BIG;
+
+ kbufs = kcalloc(kdata.num, sizeof(*kbufs), GFP_KERNEL);
+ if (!kbufs)
+ return -ENOMEM;
+
+ if (copy_from_user(kbufs, kdata.ubufs,
+ sizeof(*kbufs) * kdata.num)) {
+ rc = -EFAULT;
+ goto out;
+ }
+
+ for (i = 0; i < kdata.num; i++) {
+ if (kbufs[i].size > privcmd_dm_op_buf_max_size) {
+ rc = -E2BIG;
+ goto out;
+ }
+
+ if (!access_ok(VERIFY_WRITE, kbufs[i].uptr,
+ kbufs[i].size)) {
+ rc = -EFAULT;
+ goto out;
+ }
+
+ nr_pages += DIV_ROUND_UP(
+ offset_in_page(kbufs[i].uptr) + kbufs[i].size,
+ PAGE_SIZE);
+ }
+
+ pages = kcalloc(nr_pages, sizeof(*pages), GFP_KERNEL);
+ if (!pages) {
+ rc = -ENOMEM;
+ goto out;
+ }
+
+ xbufs = kcalloc(kdata.num, sizeof(*xbufs), GFP_KERNEL);
+ if (!xbufs) {
+ rc = -ENOMEM;
+ goto out;
+ }
+
+ rc = lock_pages(kbufs, kdata.num, pages, nr_pages);
+ if (rc)
+ goto out;
+
+ for (i = 0; i < kdata.num; i++) {
+ set_xen_guest_handle(xbufs[i].h, kbufs[i].uptr);
+ xbufs[i].size = kbufs[i].size;
+ }
+
+ xen_preemptible_hcall_begin();
+ rc = HYPERVISOR_dm_op(kdata.dom, kdata.num, xbufs);
+ xen_preemptible_hcall_end();
+
+out:
+ unlock_pages(pages, nr_pages);
+ kfree(xbufs);
+ kfree(pages);
+ kfree(kbufs);
+
+ return rc;
+}
+
static long privcmd_ioctl(struct file *file,
unsigned int cmd, unsigned long data)
{
@@ -571,6 +706,10 @@ static long privcmd_ioctl(struct file *file,
ret = privcmd_ioctl_mmap_batch(udata, 2);
break;
+ case IOCTL_PRIVCMD_DM_OP:
+ ret = privcmd_ioctl_dm_op(udata);
+ break;
+
default:
break;
}
diff --git a/include/uapi/xen/privcmd.h b/include/uapi/xen/privcmd.h
index 7ddeeda..f8c5d75 100644
--- a/include/uapi/xen/privcmd.h
+++ b/include/uapi/xen/privcmd.h
@@ -77,6 +77,17 @@ struct privcmd_mmapbatch_v2 {
int __user *err; /* array of error codes */
};
+struct privcmd_dm_op_buf {
+ void __user *uptr;
+ size_t size;
+};
+
+struct privcmd_dm_op {
+ domid_t dom;
+ __u16 num;
+ const struct privcmd_dm_op_buf __user *ubufs;
+};
+
/*
* @cmd: IOCTL_PRIVCMD_HYPERCALL
* @arg: &privcmd_hypercall_t
@@ -98,5 +109,7 @@ struct privcmd_mmapbatch_v2 {
_IOC(_IOC_NONE, 'P', 3, sizeof(struct privcmd_mmapbatch))
#define IOCTL_PRIVCMD_MMAPBATCH_V2 \
_IOC(_IOC_NONE, 'P', 4, sizeof(struct privcmd_mmapbatch_v2))
+#define IOCTL_PRIVCMD_DM_OP \
+ _IOC(_IOC_NONE, 'P', 5, sizeof(struct privcmd_dm_op))
#endif /* __LINUX_PUBLIC_PRIVCMD_H__ */
diff --git a/include/xen/arm/hypercall.h b/include/xen/arm/hypercall.h
index 9d874db..73db4b2 100644
--- a/include/xen/arm/hypercall.h
+++ b/include/xen/arm/hypercall.h
@@ -53,6 +53,7 @@ int HYPERVISOR_physdev_op(int cmd, void *arg);
int HYPERVISOR_vcpu_op(int cmd, int vcpuid, void *extra_args);
int HYPERVISOR_tmem_op(void *arg);
int HYPERVISOR_vm_assist(unsigned int cmd, unsigned int type);
+int HYPERVISOR_dm_op(domid_t domid, unsigned int nr_bufs, void *bufs);
int HYPERVISOR_platform_op_raw(void *arg);
static inline int HYPERVISOR_platform_op(struct xen_platform_op *op)
{
diff --git a/include/xen/interface/hvm/dm_op.h b/include/xen/interface/hvm/dm_op.h
new file mode 100644
index 0000000..ee9e480
--- /dev/null
+++ b/include/xen/interface/hvm/dm_op.h
@@ -0,0 +1,32 @@
+/*
+ * Copyright (c) 2016, Citrix Systems Inc
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef __XEN_PUBLIC_HVM_DM_OP_H__
+#define __XEN_PUBLIC_HVM_DM_OP_H__
+
+struct xen_dm_op_buf {
+ GUEST_HANDLE(void) h;
+ xen_ulong_t size;
+};
+DEFINE_GUEST_HANDLE_STRUCT(xen_dm_op_buf);
+
+#endif /* __XEN_PUBLIC_HVM_DM_OP_H__ */
diff --git a/include/xen/interface/xen.h b/include/xen/interface/xen.h
index 1b0d189..4f4830e 100644
--- a/include/xen/interface/xen.h
+++ b/include/xen/interface/xen.h
@@ -81,6 +81,7 @@
#define __HYPERVISOR_tmem_op 38
#define __HYPERVISOR_xc_reserved_op 39 /* reserved for XenClient */
#define __HYPERVISOR_xenpmu_op 40
+#define __HYPERVISOR_dm_op 41
/* Architecture-specific hypercall definitions. */
#define __HYPERVISOR_arch_0 48
--
2.1.4
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