Merge branch 'audit.b51' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/audit...

[linux-2.6] / arch / x86 / kernel / i387.c

diff --git a/arch/x86/kernel/i387.c b/arch/x86/kernel/i387.c
index baf632b221d43366b1f026b28add587e249e5840..e03cc952f233db9a2d77a1592798a96cf68a0674 100644 (file)
--- a/arch/x86/kernel/i387.c
+++ b/arch/x86/kernel/i387.c
@@ -8,7 +8,6 @@
 #include <linux/module.h>
 #include <linux/regset.h>
 #include <linux/sched.h>
-#include <linux/bootmem.h>
 
 #include <asm/sigcontext.h>
 #include <asm/processor.h>
@@ -63,7 +62,6 @@ void __init init_thread_xstate(void)
        else
                xstate_size = sizeof(struct i387_fsave_struct);
 #endif
-       init_task.thread.xstate = alloc_bootmem(xstate_size);
 }
 
 #ifdef CONFIG_X86_64
@@ -93,12 +91,22 @@ void __cpuinit fpu_init(void)
  * value at reset if we support XMM instructions and then
  * remeber the current task has used the FPU.
  */
-void init_fpu(struct task_struct *tsk)
+int init_fpu(struct task_struct *tsk)
 {
        if (tsk_used_math(tsk)) {
                if (tsk == current)
                        unlazy_fpu(tsk);
-               return;
+               return 0;
+       }
+
+       /*
+        * Memory allocation at the first usage of the FPU and other state.
+        */
+       if (!tsk->thread.xstate) {
+               tsk->thread.xstate = kmem_cache_alloc(task_xstate_cachep,
+                                                     GFP_KERNEL);
+               if (!tsk->thread.xstate)
+                       return -ENOMEM;
        }
 
        if (cpu_has_fxsr) {
@@ -120,6 +128,7 @@ void init_fpu(struct task_struct *tsk)
         * Only the device not available exception or ptrace can call init_fpu.
         */
        set_stopped_child_used_math(tsk);
+       return 0;
 }
 
 int fpregs_active(struct task_struct *target, const struct user_regset *regset)
@@ -136,10 +145,14 @@ int xfpregs_get(struct task_struct *target, const struct user_regset *regset,
                unsigned int pos, unsigned int count,
                void *kbuf, void __user *ubuf)
 {
+       int ret;
+
        if (!cpu_has_fxsr)
                return -ENODEV;
 
-       init_fpu(target);
+       ret = init_fpu(target);
+       if (ret)
+               return ret;
 
        return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
                                   &target->thread.xstate->fxsave, 0, -1);
@@ -154,7 +167,10 @@ int xfpregs_set(struct task_struct *target, const struct user_regset *regset,
        if (!cpu_has_fxsr)
                return -ENODEV;
 
-       init_fpu(target);
+       ret = init_fpu(target);
+       if (ret)
+               return ret;
+
        set_stopped_child_used_math(target);
 
        ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
@@ -312,11 +328,14 @@ int fpregs_get(struct task_struct *target, const struct user_regset *regset,
               void *kbuf, void __user *ubuf)
 {
        struct user_i387_ia32_struct env;
+       int ret;
 
        if (!HAVE_HWFP)
                return fpregs_soft_get(target, regset, pos, count, kbuf, ubuf);
 
-       init_fpu(target);
+       ret = init_fpu(target);
+       if (ret)
+               return ret;
 
        if (!cpu_has_fxsr) {
                return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
@@ -344,7 +363,10 @@ int fpregs_set(struct task_struct *target, const struct user_regset *regset,
        if (!HAVE_HWFP)
                return fpregs_soft_set(target, regset, pos, count, kbuf, ubuf);
 
-       init_fpu(target);
+       ret = init_fpu(target);
+       if (ret)
+               return ret;
+
        set_stopped_child_used_math(target);
 
        if (!cpu_has_fxsr) {
@@ -428,7 +450,6 @@ static inline int restore_i387_fsave(struct _fpstate_ia32 __user *buf)
 {
        struct task_struct *tsk = current;
 
-       clear_fpu(tsk);
        return __copy_from_user(&tsk->thread.xstate->fsave, buf,
                                sizeof(struct i387_fsave_struct));
 }
@@ -439,7 +460,6 @@ static int restore_i387_fxsave(struct _fpstate_ia32 __user *buf)
        struct user_i387_ia32_struct env;
        int err;
 
-       clear_fpu(tsk);
        err = __copy_from_user(&tsk->thread.xstate->fxsave, &buf->_fxsr_env[0],
                               sizeof(struct i387_fxsave_struct));
        /* mxcsr reserved bits must be masked to zero for security reasons */
@@ -456,6 +476,16 @@ int restore_i387_ia32(struct _fpstate_ia32 __user *buf)
        int err;
 
        if (HAVE_HWFP) {
+               struct task_struct *tsk = current;
+
+               clear_fpu(tsk);
+
+               if (!used_math()) {
+                       err = init_fpu(tsk);
+                       if (err)
+                               return err;
+               }
+
                if (cpu_has_fxsr)
                        err = restore_i387_fxsave(buf);
                else