x86/fpu: Pass 'struct fpu' to fpstate_sanitize_xstate()

Currently fpstate_sanitize_xstate() has a task_struct input parameter,
but it only uses the fpu structure from it - so pass in a 'struct fpu'
pointer only and update all call sites.

Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/arch/x86/include/asm/fpu/internal.h b/arch/x86/include/asm/fpu/internal.h
index 88fec3f108de16c597595f55435289d16fc54920..da96b0cbfcb3762695af1a6b31600762786fe0fd 100644 (file)
--- a/arch/x86/include/asm/fpu/internal.h
+++ b/arch/x86/include/asm/fpu/internal.h
@@ -139,7 +139,7 @@ static inline void fx_finit(struct i387_fxsave_struct *fx)
        fx->mxcsr = MXCSR_DEFAULT;
 }
 
-extern void fpstate_sanitize_xstate(struct task_struct *);
+extern void fpstate_sanitize_xstate(struct fpu *fpu);
 
 #define user_insn(insn, output, input...)                              \
 ({                                                                     \

diff --git a/arch/x86/kernel/fpu/core.c b/arch/x86/kernel/fpu/core.c
index 561a3532abc2f64a1d8da6d6e7084ed7231adef8..1d6e97c59a720ddd6f5a0136d8d6139954a0d5bf 100644 (file)
--- a/arch/x86/kernel/fpu/core.c
+++ b/arch/x86/kernel/fpu/core.c
@@ -395,7 +395,7 @@ int xfpregs_get(struct task_struct *target, const struct user_regset *regset,
                return -ENODEV;
 
        fpu__activate_stopped(fpu);
-       fpstate_sanitize_xstate(target);
+       fpstate_sanitize_xstate(fpu);
 
        return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
                                   &fpu->state.fxsave, 0, -1);
@@ -412,7 +412,7 @@ int xfpregs_set(struct task_struct *target, const struct user_regset *regset,
                return -ENODEV;
 
        fpu__activate_stopped(fpu);
-       fpstate_sanitize_xstate(target);
+       fpstate_sanitize_xstate(fpu);
 
        ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
                                 &fpu->state.fxsave, 0, -1);
@@ -644,7 +644,7 @@ int fpregs_get(struct task_struct *target, const struct user_regset *regset,
                                           &fpu->state.fsave, 0,
                                           -1);
 
-       fpstate_sanitize_xstate(target);
+       fpstate_sanitize_xstate(fpu);
 
        if (kbuf && pos == 0 && count == sizeof(env)) {
                convert_from_fxsr(kbuf, target);
@@ -665,8 +665,7 @@ int fpregs_set(struct task_struct *target, const struct user_regset *regset,
        int ret;
 
        fpu__activate_stopped(fpu);
-
-       fpstate_sanitize_xstate(target);
+       fpstate_sanitize_xstate(fpu);
 
        if (!static_cpu_has(X86_FEATURE_FPU))
                return fpregs_soft_set(target, regset, pos, count, kbuf, ubuf);

diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c
index 47b9591947e1e3bde36ad98751aec70875f66151..a8ce38a9d70b6b9a40f9ee3db55fe0b1840887a4 100644 (file)
--- a/arch/x86/kernel/fpu/xstate.c
+++ b/arch/x86/kernel/fpu/xstate.c
@@ -92,16 +92,16 @@ EXPORT_SYMBOL_GPL(cpu_has_xfeatures);
  * if the corresponding header bit is zero. This is to ensure that user-space doesn't
  * see some stale state in the memory layout during signal handling, debugging etc.
  */
-void fpstate_sanitize_xstate(struct task_struct *tsk)
+void fpstate_sanitize_xstate(struct fpu *fpu)
 {
-       struct i387_fxsave_struct *fx = &tsk->thread.fpu.state.fxsave;
+       struct i387_fxsave_struct *fx = &fpu->state.fxsave;
        int feature_bit;
        u64 xfeatures;
 
        if (!use_xsaveopt())
                return;
 
-       xfeatures = tsk->thread.fpu.state.xsave.header.xfeatures;
+       xfeatures = fpu->state.xsave.header.xfeatures;
 
        /*
         * None of the feature bits are in init state. So nothing else
@@ -318,7 +318,7 @@ int save_xstate_sig(void __user *buf, void __user *buf_fx, int size)
                if (ia32_fxstate)
                        fpu_fxsave(&tsk->thread.fpu);
        } else {
-               fpstate_sanitize_xstate(tsk);
+               fpstate_sanitize_xstate(&tsk->thread.fpu);
                if (__copy_to_user(buf_fx, xsave, xstate_size))
                        return -1;
        }