x86/fpu: Remove 'kbuf' parameter from the copy_user_to_xstate() API

No change in functionality.

Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Yu-cheng Yu <yu-cheng.yu@intel.com>
Link: http://lkml.kernel.org/r/20170923130016.21448-14-mingo@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/arch/x86/include/asm/fpu/xstate.h b/arch/x86/include/asm/fpu/xstate.h
index f10889b..4ceb907 100644 (file)
--- a/arch/x86/include/asm/fpu/xstate.h
+++ b/arch/x86/include/asm/fpu/xstate.h
@@ -51,5 +51,5 @@ int using_compacted_format(void);
 int copy_xstate_to_kernel(void *kbuf, struct xregs_state *xsave, unsigned int offset, unsigned int size);
 int copy_xstate_to_user(void __user *ubuf, struct xregs_state *xsave, unsigned int offset, unsigned int size);
 int copy_kernel_to_xstate(const void *kbuf, struct xregs_state *xsave);
-int copy_user_to_xstate(const void *kbuf, const void __user *ubuf, struct xregs_state *xsave);
+int copy_user_to_xstate(const void __user *ubuf, struct xregs_state *xsave);
 #endif

diff --git a/arch/x86/kernel/fpu/regset.c b/arch/x86/kernel/fpu/regset.c
index 785302c..caf723f 100644 (file)
--- a/arch/x86/kernel/fpu/regset.c
+++ b/arch/x86/kernel/fpu/regset.c
@@ -138,7 +138,7 @@ int xstateregs_set(struct task_struct *target, const struct user_regset *regset,
                if (kbuf)
                        ret = copy_kernel_to_xstate(kbuf, xsave);
                else
-                       ret = copy_user_to_xstate(kbuf, ubuf, xsave);
+                       ret = copy_user_to_xstate(ubuf, xsave);
        } else {
                ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, xsave, 0, -1);
        }

diff --git a/arch/x86/kernel/fpu/signal.c b/arch/x86/kernel/fpu/signal.c
index b1fe9a1..2c685b4 100644 (file)
--- a/arch/x86/kernel/fpu/signal.c
+++ b/arch/x86/kernel/fpu/signal.c
@@ -323,13 +323,10 @@ static int __fpu__restore_sig(void __user *buf, void __user *buf_fx, int size)
                 */
                fpu__drop(fpu);
 
-               if (using_compacted_format()) {
-                       err = copy_user_to_xstate(NULL, buf_fx,
-                                              &fpu->state.xsave);
-               } else {
-                       err = __copy_from_user(&fpu->state.xsave,
-                                              buf_fx, state_size);
-               }
+               if (using_compacted_format())
+                       err = copy_user_to_xstate(buf_fx, &fpu->state.xsave);
+               else
+                       err = __copy_from_user(&fpu->state.xsave, buf_fx, state_size);
 
                if (err || __copy_from_user(&env, buf, sizeof(env))) {
                        fpstate_init(&fpu->state);

diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c
index 71cc8d3..b1f3e4d 100644 (file)
--- a/arch/x86/kernel/fpu/xstate.c
+++ b/arch/x86/kernel/fpu/xstate.c
@@ -1142,8 +1142,7 @@ int copy_kernel_to_xstate(const void *kbuf, struct xregs_state *xsave)
  * there we check the CPU has XSAVES and a whole standard-sized buffer
  * exists.
  */
-int copy_user_to_xstate(const void *kbuf, const void __user *ubuf,
-                    struct xregs_state *xsave)
+int copy_user_to_xstate(const void __user *ubuf, struct xregs_state *xsave)
 {
        unsigned int offset, size;
        int i;
@@ -1153,12 +1152,8 @@ int copy_user_to_xstate(const void *kbuf, const void __user *ubuf,
        offset = offsetof(struct xregs_state, header);
        size = sizeof(xfeatures);
 
-       if (kbuf) {
-               memcpy(&xfeatures, kbuf + offset, size);
-       } else {
-               if (__copy_from_user(&xfeatures, ubuf + offset, size))
-                       return -EFAULT;
-       }
+       if (__copy_from_user(&xfeatures, ubuf + offset, size))
+               return -EFAULT;
 
        /*
         * Reject if the user sets any disabled or supervisor features:
@@ -1177,12 +1172,8 @@ int copy_user_to_xstate(const void *kbuf, const void __user *ubuf,
                        offset = xstate_offsets[i];
                        size = xstate_sizes[i];
 
-                       if (kbuf) {
-                               memcpy(dst, kbuf + offset, size);
-                       } else {
-                               if (__copy_from_user(dst, ubuf + offset, size))
-                                       return -EFAULT;
-                       }
+                       if (__copy_from_user(dst, ubuf + offset, size))
+                               return -EFAULT;
                }
        }