提交 b2d9d334 编写于 作者: I Ingo Molnar

Merge branch 'x86/fpu' into x86/core

......@@ -104,7 +104,16 @@ static inline int restore_i387(struct _fpstate __user *buf)
clts();
task_thread_info(current)->status |= TS_USEDFPU;
}
return restore_fpu_checking((__force struct i387_fxsave_struct *)buf);
err = restore_fpu_checking((__force struct i387_fxsave_struct *)buf);
if (unlikely(err)) {
/*
* Encountered an error while doing the restore from the
* user buffer, clear the fpu state.
*/
clear_fpu(tsk);
clear_used_math();
}
return err;
}
/*
......
......@@ -1131,7 +1131,14 @@ asmlinkage void math_state_restore(void)
}
clts(); /* Allow maths ops (or we recurse) */
restore_fpu_checking(&me->thread.xstate->fxsave);
/*
* Paranoid restore. send a SIGSEGV if we fail to restore the state.
*/
if (unlikely(restore_fpu_checking(&me->thread.xstate->fxsave))) {
stts();
force_sig(SIGSEGV, me);
return;
}
task_thread_info(me)->status |= TS_USEDFPU;
me->fpu_counter++;
}
......
......@@ -62,8 +62,6 @@ static inline int restore_fpu_checking(struct i387_fxsave_struct *fx)
#else
: [fx] "cdaSDb" (fx), "m" (*fx), "0" (0));
#endif
if (unlikely(err))
init_fpu(current);
return err;
}
......
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