x86: xsave: set FP, SSE bits in the xsave header in the user sigcontext

If a processor implementation discern that a processor state component is in
its initialized state, it may modify the corresponding bit in the
xsave header.xstate_bv as '0'. State in the memory layout setup by 'xsave'
will be consistent with the bit values in the header.

During signal handling, legacy applications may change the FP/SSE bits
in the sigcontext memory layout without touching the FP/SSE header bits
in the xsave header. So always set FP/SSE bits in the xsave header
while saving the sigcontext state to the user space. During signal return,
this will enable the kernel to capture any changes to the FP/SSE bits by the
legacy applications which don't touch xsave headers.

xsave aware apps can change the xstate_bv in the xsave header aswell
as change any contents in the memory layout. xrestor as part of sigreturn
will capture all the changes.

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

2 files changed, 39 insertions, 0 deletions

diff --git a/arch/x86/kernel/i387.c b/arch/x86/kernel/i387.c
index 45723f1fe198..1f20608d4ca8 100644
--- a/arch/x86/kernel/i387.c
+++ b/arch/x86/kernel/i387.c
@@ -468,9 +468,23 @@ static int save_i387_fxsave(struct _fpstate_ia32 __user *buf)
 
 static int save_i387_xsave(void __user *buf)
 {
+        struct task_struct *tsk = current;
         struct _fpstate_ia32 __user *fx = buf;
         int err = 0;
 
+        /*
+         * For legacy compatible, we always set FP/SSE bits in the bit
+         * vector while saving the state to the user context.
+         * This will enable us capturing any changes(during sigreturn) to
+         * the FP/SSE bits by the legacy applications which don't touch
+         * xstate_bv in the xsave header.
+         *
+         * xsave aware applications can change the xstate_bv in the xsave
+         * header as well as change any contents in the memory layout.
+         * xrestore as part of sigreturn will capture all the changes.
+         */
+        tsk->thread.xstate->xsave.xsave_hdr.xstate_bv |= XSTATE_FPSSE;
+
         if (save_i387_fxsave(fx) < 0)
                 return -1;
 
diff --git a/arch/x86/kernel/xsave.c b/arch/x86/kernel/xsave.c
index 448fde96963c..2f98323716d9 100644
--- a/arch/x86/kernel/xsave.c
+++ b/arch/x86/kernel/xsave.c
@@ -114,6 +114,8 @@ int save_i387_xstate(void __user *buf)
 
         if (task_thread_info(tsk)->status & TS_XSAVE) {
                 struct _fpstate __user *fx = buf;
+                struct _xstate __user *x = buf;
+                u64 xstate_bv;
 
                 err = __copy_to_user(&fx->sw_reserved, &fx_sw_reserved,
                                      sizeof(struct _fpx_sw_bytes));
@@ -121,6 +123,29 @@ int save_i387_xstate(void __user *buf)
                 err |= __put_user(FP_XSTATE_MAGIC2,
                                   (__u32 __user *) (buf + sig_xstate_size
                                                     - FP_XSTATE_MAGIC2_SIZE));
+
+                /*
+                 * Read the xstate_bv which we copied (directly from the cpu or
+                 * from the state in task struct) to the user buffers and
+                 * set the FP/SSE bits.
+                 */
+                err |= __get_user(xstate_bv, &x->xstate_hdr.xstate_bv);
+
+                /*
+                 * For legacy compatible, we always set FP/SSE bits in the bit
+                 * vector while saving the state to the user context. This will
+                 * enable us capturing any changes(during sigreturn) to
+                 * the FP/SSE bits by the legacy applications which don't touch
+                 * xstate_bv in the xsave header.
+                 *
+                 * xsave aware apps can change the xstate_bv in the xsave
+                 * header as well as change any contents in the memory layout.
+                 * xrestore as part of sigreturn will capture all the changes.
+                 */
+                xstate_bv |= XSTATE_FPSSE;
+
+                err |= __put_user(xstate_bv, &x->xstate_hdr.xstate_bv);
+
                 if (err)
                         return err;
         }