misc: mic: Fix user space namespace pollution from mic_common.h.

Avoid declaring ALIGN() and __aligned() in
include/uapi/linux/mic_common.h since they pollute user space
namespace. Also, mic_aligned_size() can be simply replaced simply by
sizeof() since all structures where mic_aligned_size() is used are
declared using __attribute__ ((aligned(8)));

--
>From mail from H Peter Anvin about this:

On Fri, Nov 08, 2013 H Peter Anvin <h.peter.anvin@intel.com> wrote:
Subject: Namespace pollution in mic_common.h

This puts two macros, ALIGN() and __aligned(), into arbitrary user space
namespace.  This really isn't safe or acceptable, especially since those
symbols are highly generic.
...
When these structures are forced-aligned, they will in fact have padding
automatically added by the compiler to an 8-byte boundary anyway, so
mic_aligned_size() does nothing.
...

Reported-by: H Peter Anvin <h.peter.anvin@intel.com>
Reviewed-by: Sudeep Dutt <sudeep.dutt@intel.com>
Signed-off-by: Nikhil Rao <nikhil.rao@intel.com>
Signed-off-by: Ashutosh Dixit <ashutosh.dixit@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 9 insertions, 17 deletions

diff --git a/include/uapi/linux/mic_common.h b/include/uapi/linux/mic_common.h
index 17e7d95e4f53..d0ec46d88d2a 100644
--- a/include/uapi/linux/mic_common.h
+++ b/include/uapi/linux/mic_common.h
@@ -23,12 +23,7 @@
 
 #include <linux/virtio_ring.h>
 
-#ifndef __KERNEL__
-#define ALIGN(a, x)     (((a) + (x) - 1) & ~((x) - 1))
-#define __aligned(x)    __attribute__ ((aligned(x)))
-#endif
-
-#define mic_aligned_size(x) ALIGN(sizeof(x), 8)
+#define __mic_align(a, x) (((a) + (x) - 1) & ~((x) - 1))
 
 /**
  * struct mic_device_desc: Virtio device information shared between the
@@ -49,7 +44,7 @@ struct mic_device_desc {
         __u8 config_len;
         __u8 status;
         __u64 config[0];
-} __aligned(8);
+} __attribute__ ((aligned(8)));
 
 /**
  * struct mic_device_ctrl: Per virtio device information in the device page
@@ -74,7 +69,7 @@ struct mic_device_ctrl {
         __u8 used_address_updated;
         __s8 c2h_vdev_db;
         __s8 h2c_vdev_db;
-} __aligned(8);
+} __attribute__ ((aligned(8)));
 
 /**
  * struct mic_bootparam: Virtio device independent information in device page
@@ -93,7 +88,7 @@ struct mic_bootparam {
         __s8 h2c_config_db;
         __u8 shutdown_status;
         __u8 shutdown_card;
-} __aligned(8);
+} __attribute__ ((aligned(8)));
 
 /**
  * struct mic_device_page: High level representation of the device page
@@ -119,7 +114,7 @@ struct mic_vqconfig {
         __u64 address;
         __u64 used_address;
         __u16 num;
-} __aligned(8);
+} __attribute__ ((aligned(8)));
 
 /*
  * The alignment to use between consumer and producer parts of vring.
@@ -173,15 +168,13 @@ struct mic_vring {
         int len;
 };
 
-#define mic_aligned_desc_size(d) ALIGN(mic_desc_size(d), 8)
+#define mic_aligned_desc_size(d) __mic_align(mic_desc_size(d), 8)
 
 #ifndef INTEL_MIC_CARD
 static inline unsigned mic_desc_size(const struct mic_device_desc *desc)
 {
-        return mic_aligned_size(*desc)
-                + desc->num_vq * mic_aligned_size(struct mic_vqconfig)
-                + desc->feature_len * 2
-                + desc->config_len;
+        return sizeof(*desc) + desc->num_vq * sizeof(struct mic_vqconfig)
+                + desc->feature_len * 2 + desc->config_len;
 }
 
 static inline struct mic_vqconfig *
@@ -201,8 +194,7 @@ static inline __u8 *mic_vq_configspace(const struct mic_device_desc *desc)
 }
 static inline unsigned mic_total_desc_size(struct mic_device_desc *desc)
 {
-        return mic_aligned_desc_size(desc) +
-                mic_aligned_size(struct mic_device_ctrl);
+        return mic_aligned_desc_size(desc) + sizeof(struct mic_device_ctrl);
 }
 #endif