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Groups > linux.kernel > #1673519
| From | Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH] x86/xen: allow userspace access during hypercalls |
| Date | 2017-06-23 14:50 +0200 |
| Message-ID | <tVwca-2bn-11@gated-at.bofh.it> (permalink) |
| Organization | Invisible Things Lab |
Userspace application can do a hypercall through /dev/xen/privcmd, and
some for some hypercalls argument is a pointers to user-provided
structure. When SMAP is supported and enabled, hypervisor can't access.
So, lets allow it.
Cc: stable@vger.kernel.org
Signed-off-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
---
arch/x86/include/asm/xen/hypercall.h | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/x86/include/asm/xen/hypercall.h b/arch/x86/include/asm/xen/hypercall.h
index f6d20f6..a1d2c5d 100644
--- a/arch/x86/include/asm/xen/hypercall.h
+++ b/arch/x86/include/asm/xen/hypercall.h
@@ -43,6 +43,7 @@
#include <asm/page.h>
#include <asm/pgtable.h>
+#include <asm/smap.h>
#include <xen/interface/xen.h>
#include <xen/interface/sched.h>
@@ -214,10 +215,12 @@ privcmd_call(unsigned call,
__HYPERCALL_DECLS;
__HYPERCALL_5ARG(a1, a2, a3, a4, a5);
+ stac();
asm volatile("call *%[call]"
: __HYPERCALL_5PARAM
: [call] "a" (&hypercall_page[call])
: __HYPERCALL_CLOBBER5);
+ clac();
return (long)__res;
}
--
2.7.4
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[PATCH] x86/xen: allow userspace access during hypercalls Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com> - 2017-06-23 14:50 +0200
Re: [PATCH] x86/xen: allow userspace access during hypercalls Juergen Groß <jgross@suse.com> - 2017-06-26 14:10 +0200
Re: [PATCH] x86/xen: allow userspace access during hypercalls Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com> - 2017-06-26 14:50 +0200
Re: [PATCH v2] x86/xen: allow userspace access during hypercalls Juergen Groß <jgross@suse.com> - 2017-06-26 15:00 +0200
[PATCH v2] x86/xen: allow userspace access during hypercalls Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com> - 2017-06-26 15:00 +0200
Re: [PATCH v2] x86/xen: allow userspace access during hypercalls Juergen Gross <jgross@suse.com> - 2017-07-03 13:30 +0200
RE: [Xen-devel] [PATCH] x86/xen: allow userspace access during hypercalls Paul Durrant <Paul.Durrant@citrix.com> - 2017-06-26 15:20 +0200
RE: [Xen-devel] [PATCH] x86/xen: allow userspace access during hypercalls Paul Durrant <Paul.Durrant@citrix.com> - 2017-06-26 15:30 +0200
Re: [Xen-devel] [PATCH] x86/xen: allow userspace access during hypercalls 'Marek Marczykowski-Górecki' <marmarek@invisiblethingslab.com> - 2017-06-26 15:30 +0200
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