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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] Fix iopl/iobitmap interfaces. Control tools can set per-domain
ChangeSet 1.1353, 2005/03/23 13:35:24+00:00, kaf24@xxxxxxxxxxxxxxxxxxxx
Fix iopl/iobitmap interfaces. Control tools can set per-domain
access limits via DOM0_IOPL_PERMISSION/DOM0_IOPORT_PERMISSION.
Guests can set current permissions per VCPU via physdev ops.
These will always succeed -- checking against admin-set limits is
done at access time.
Signed-off-by: Keir Fraser <keir@xxxxxxxxxxxxx>
linux-2.4.29-xen-sparse/arch/xen/kernel/ioport.c | 43 +++
linux-2.4.29-xen-sparse/arch/xen/kernel/process.c | 15 -
linux-2.4.29-xen-sparse/arch/xen/kernel/setup.c | 17 -
linux-2.4.29-xen-sparse/mkbuildtree | 1
linux-2.6.11-xen-sparse/arch/xen/i386/kernel/ioport.c | 116 ++++++++-
linux-2.6.11-xen-sparse/arch/xen/i386/kernel/process.c | 75 +-----
linux-2.6.11-xen-sparse/arch/xen/i386/kernel/setup.c | 20 -
xen/arch/x86/dom0_ops.c | 55 ++++
xen/arch/x86/domain.c | 47 ---
xen/arch/x86/setup.c | 1
xen/arch/x86/traps.c | 75 ++++--
xen/common/domain.c | 7
xen/common/physdev.c | 202 ++++++-----------
xen/include/asm-x86/domain.h | 11
xen/include/asm-x86/processor.h | 8
xen/include/public/dom0_ops.h | 26 +-
xen/include/public/physdev.h | 17 +
17 files changed, 430 insertions(+), 306 deletions(-)
diff -Nru a/linux-2.4.29-xen-sparse/arch/xen/kernel/ioport.c
b/linux-2.4.29-xen-sparse/arch/xen/kernel/ioport.c
--- /dev/null Wed Dec 31 16:00:00 196900
+++ b/linux-2.4.29-xen-sparse/arch/xen/kernel/ioport.c 2005-03-23 09:02:50
-05:00
@@ -0,0 +1,43 @@
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/ioport.h>
+#include <linux/mm.h>
+#include <linux/smp.h>
+#include <linux/smp_lock.h>
+#include <linux/stddef.h>
+#include <linux/slab.h>
+#include <asm-xen/xen-public/physdev.h>
+
+asmlinkage long sys_iopl(unsigned int new_io_pl)
+{
+ unsigned int old_io_pl = current->thread.io_pl;
+ physdev_op_t op;
+
+ if (new_io_pl > 3)
+ return -EINVAL;
+
+ /* Need "raw I/O" privileges for direct port access. */
+ if ((new_io_pl > old_io_pl) && !capable(CAP_SYS_RAWIO))
+ return -EPERM;
+
+ /* Maintain OS privileges even if user attempts to relinquish them. */
+ if (new_io_pl == 0)
+ new_io_pl = 1;
+
+ /* Change our version of the privilege levels. */
+ current->thread.io_pl = new_io_pl;
+
+ /* Force the change at ring 0. */
+ op.cmd = PHYSDEVOP_SET_IOPL;
+ op.u.set_iopl.iopl = new_io_pl;
+ HYPERVISOR_physdev_op(&op);
+
+ return 0;
+}
+
+asmlinkage long sys_ioperm(unsigned long from, unsigned long num, int turn_on)
+{
+ return turn_on ? sys_iopl(3) : 0;
+}
diff -Nru a/linux-2.4.29-xen-sparse/arch/xen/kernel/process.c
b/linux-2.4.29-xen-sparse/arch/xen/kernel/process.c
--- a/linux-2.4.29-xen-sparse/arch/xen/kernel/process.c 2005-03-23 09:02:49
-05:00
+++ b/linux-2.4.29-xen-sparse/arch/xen/kernel/process.c 2005-03-23 09:02:49
-05:00
@@ -44,7 +44,7 @@
#include <asm/desc.h>
#include <asm/mmu_context.h>
#include <asm/multicall.h>
-#include <asm-xen/xen-public/dom0_ops.h>
+#include <asm-xen/xen-public/physdev.h>
#include <linux/irq.h>
@@ -304,6 +304,7 @@
void fastcall __switch_to(struct task_struct *prev_p, struct task_struct
*next_p)
{
struct thread_struct *next = &next_p->thread;
+ physdev_op_t op;
__cli();
@@ -335,14 +336,12 @@
}
queue_multicall2(__HYPERVISOR_stack_switch, __KERNEL_DS, next->esp0);
- if ( xen_start_info.flags & SIF_PRIVILEGED )
+
+ if ( prev_p->thread.io_pl != next->io_pl )
{
- dom0_op_t op;
- op.cmd = DOM0_IOPL;
- op.u.iopl.domain = DOMID_SELF;
- op.u.iopl.iopl = next->io_pl;
- op.interface_version = DOM0_INTERFACE_VERSION;
- queue_multicall1(__HYPERVISOR_dom0_op, (unsigned long)&op);
+ op.cmd = PHYSDEVOP_SET_IOPL;
+ op.u.set_iopl.iopl = next->io_pl;
+ queue_multicall1(__HYPERVISOR_physdev_op, (unsigned long)&op);
}
/* EXECUTE ALL TASK SWITCH XEN SYSCALLS AT THIS POINT. */
diff -Nru a/linux-2.4.29-xen-sparse/arch/xen/kernel/setup.c
b/linux-2.4.29-xen-sparse/arch/xen/kernel/setup.c
--- a/linux-2.4.29-xen-sparse/arch/xen/kernel/setup.c 2005-03-23 09:02:49
-05:00
+++ b/linux-2.4.29-xen-sparse/arch/xen/kernel/setup.c 2005-03-23 09:02:50
-05:00
@@ -48,7 +48,7 @@
#include <asm/mmu_context.h>
#include <asm/ctrl_if.h>
#include <asm/hypervisor.h>
-#include <asm-xen/xen-public/dom0_ops.h>
+#include <asm-xen/xen-public/physdev.h>
#include <linux/netdevice.h>
#include <linux/rtnetlink.h>
#include <linux/tqueue.h>
@@ -206,6 +206,7 @@
unsigned long bootmap_size, start_pfn, lmax_low_pfn;
int mem_param; /* user specified memory size in pages */
int boot_pfn; /* low pages available for bootmem */
+ physdev_op_t op;
extern void hypervisor_callback(void);
extern void failsafe_callback(void);
@@ -416,17 +417,9 @@
HYPERVISOR_shared_info->arch.pfn_to_mfn_frame_list =
virt_to_machine(pfn_to_mfn_frame_list) >> PAGE_SHIFT;
- /* If we are a privileged guest OS then we should request IO privileges. */
- if ( xen_start_info.flags & SIF_PRIVILEGED )
- {
- dom0_op_t op;
- op.cmd = DOM0_IOPL;
- op.u.iopl.domain = DOMID_SELF;
- op.u.iopl.iopl = 1;
- if( HYPERVISOR_dom0_op(&op) != 0 )
- panic("Unable to obtain IOPL, despite being SIF_PRIVILEGED");
- current->thread.io_pl = 1;
- }
+ op.cmd = PHYSDEVOP_SET_IOPL;
+ op.u.set_iopl.iopl = current->thread.io_pl = 1;
+ HYPERVISOR_physdev_op(&op);
if (xen_start_info.flags & SIF_INITDOMAIN )
{
diff -Nru a/linux-2.4.29-xen-sparse/mkbuildtree
b/linux-2.4.29-xen-sparse/mkbuildtree
--- a/linux-2.4.29-xen-sparse/mkbuildtree 2005-03-23 09:02:50 -05:00
+++ b/linux-2.4.29-xen-sparse/mkbuildtree 2005-03-23 09:02:50 -05:00
@@ -232,7 +232,6 @@
ln -sf ../../../${LINUX_26}/arch/xen/kernel/gnttab.c
ln -sf ../../../${LINUX_26}/arch/xen/kernel/reboot.c
ln -sf ../../../${LINUX_26}/arch/xen/kernel/skbuff.c
-ln -sf ../../../${LINUX_26}/arch/xen/i386/kernel/ioport.c
ln -sf ../../../${LINUX_26}/arch/xen/i386/kernel/pci-dma.c
cd ${AD}/arch/xen/lib
diff -Nru a/linux-2.6.11-xen-sparse/arch/xen/i386/kernel/ioport.c
b/linux-2.6.11-xen-sparse/arch/xen/i386/kernel/ioport.c
--- a/linux-2.6.11-xen-sparse/arch/xen/i386/kernel/ioport.c 2005-03-23
09:02:49 -05:00
+++ b/linux-2.6.11-xen-sparse/arch/xen/i386/kernel/ioport.c 2005-03-23
09:02:49 -05:00
@@ -1,19 +1,110 @@
+/*
+ * linux/arch/i386/kernel/ioport.c
+ *
+ * This contains the io-permission bitmap code - written by obz, with changes
+ * by Linus.
+ */
+
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/ioport.h>
-#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <linux/stddef.h>
#include <linux/slab.h>
-#include <asm-xen/xen-public/dom0_ops.h>
+#include <linux/thread_info.h>
+#include <asm-xen/xen-public/physdev.h>
+
+/* Set EXTENT bits starting at BASE in BITMAP to value TURN_ON. */
+static void set_bitmap(unsigned long *bitmap, unsigned int base, unsigned int
extent, int new_value)
+{
+ unsigned long mask;
+ unsigned long *bitmap_base = bitmap + (base / BITS_PER_LONG);
+ unsigned int low_index = base & (BITS_PER_LONG-1);
+ int length = low_index + extent;
+
+ if (low_index != 0) {
+ mask = (~0UL << low_index);
+ if (length < BITS_PER_LONG)
+ mask &= ~(~0UL << length);
+ if (new_value)
+ *bitmap_base++ |= mask;
+ else
+ *bitmap_base++ &= ~mask;
+ length -= BITS_PER_LONG;
+ }
+
+ mask = (new_value ? ~0UL : 0UL);
+ while (length >= BITS_PER_LONG) {
+ *bitmap_base++ = mask;
+ length -= BITS_PER_LONG;
+ }
+
+ if (length > 0) {
+ mask = ~(~0UL << length);
+ if (new_value)
+ *bitmap_base++ |= mask;
+ else
+ *bitmap_base++ &= ~mask;
+ }
+}
+
+
+/*
+ * this changes the io permissions bitmap in the current task.
+ */
+asmlinkage long sys_ioperm(unsigned long from, unsigned long num, int turn_on)
+{
+ struct thread_struct * t = ¤t->thread;
+ unsigned long *bitmap;
+ physdev_op_t op;
+
+ if ((from + num <= from) || (from + num > IO_BITMAP_BITS))
+ return -EINVAL;
+ if (turn_on && !capable(CAP_SYS_RAWIO))
+ return -EPERM;
+
+ /*
+ * If it's the first ioperm() call in this thread's lifetime, set the
+ * IO bitmap up. ioperm() is much less timing critical than clone(),
+ * this is why we delay this operation until now:
+ */
+ if (!t->io_bitmap_ptr) {
+ bitmap = kmalloc(IO_BITMAP_BYTES, GFP_KERNEL);
+ if (!bitmap)
+ return -ENOMEM;
+
+ memset(bitmap, 0xff, IO_BITMAP_BYTES);
+ t->io_bitmap_ptr = bitmap;
+
+ op.cmd = PHYSDEVOP_SET_IOBITMAP;
+ op.u.set_iobitmap.bitmap = (unsigned long)bitmap;
+ op.u.set_iobitmap.nr_ports = IO_BITMAP_BITS;
+ HYPERVISOR_physdev_op(&op);
+ }
+
+ set_bitmap(t->io_bitmap_ptr, from, num, !turn_on);
+
+ return 0;
+}
+
+/*
+ * sys_iopl has to be used when you want to access the IO ports
+ * beyond the 0x3ff range: to get the full 65536 ports bitmapped
+ * you'd need 8kB of bitmaps/process, which is a bit excessive.
+ *
+ * Here we just change the eflags value on the stack: we allow
+ * only the super-user to do it. This depends on the stack-layout
+ * on system-call entry - see also fork() and the signal handling
+ * code.
+ */
asmlinkage long sys_iopl(unsigned int new_io_pl)
{
-------------------------------------------------------
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