From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752451AbdIWNFz (ORCPT ); Sat, 23 Sep 2017 09:05:55 -0400 Received: from mail-wm0-f65.google.com ([74.125.82.65]:37975 "EHLO mail-wm0-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751880AbdIWNAv (ORCPT ); Sat, 23 Sep 2017 09:00:51 -0400 X-Google-Smtp-Source: AOwi7QD2kx3a9mTi57kFdIRSqr9kfNBscVGDKn3B7MgLhpCEmjWN834aHG121ikv/SqWIrBBgPnkRA== From: Ingo Molnar To: linux-kernel@vger.kernel.org Cc: Andrew Morton , Eric Biggers , Andy Lutomirski , Borislav Petkov , Dave Hansen , Fenghua Yu , "H . Peter Anvin" , Linus Torvalds , Oleg Nesterov , Peter Zijlstra , Rik van Riel , Thomas Gleixner , Yu-cheng Yu Subject: [PATCH 13/33] x86/fpu: Remove 'kbuf' parameter from the copy_user_to_xstate() API Date: Sat, 23 Sep 2017 14:59:56 +0200 Message-Id: <20170923130016.21448-14-mingo@kernel.org> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20170923130016.21448-1-mingo@kernel.org> References: <20170923130016.21448-1-mingo@kernel.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org No change in functionality. Cc: Andy Lutomirski Cc: Borislav Petkov Cc: Dave Hansen Cc: Fenghua Yu Cc: H. Peter Anvin Cc: Linus Torvalds Cc: Oleg Nesterov Cc: Peter Zijlstra Cc: Rik van Riel Cc: Thomas Gleixner Cc: Yu-cheng Yu Signed-off-by: Ingo Molnar --- arch/x86/include/asm/fpu/xstate.h | 2 +- arch/x86/kernel/fpu/regset.c | 2 +- arch/x86/kernel/fpu/signal.c | 11 ++++------- arch/x86/kernel/fpu/xstate.c | 19 +++++-------------- 4 files changed, 11 insertions(+), 23 deletions(-) diff --git a/arch/x86/include/asm/fpu/xstate.h b/arch/x86/include/asm/fpu/xstate.h index f10889bc0c88..4ceb90740d80 100644 --- 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 785302c75f38..caf723f31737 100644 --- 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 b1fe9a1fc4e0..2c685b492fd6 100644 --- 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 71cc8d367fdd..b1f3e4dae2e3 100644 --- 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; } } -- 2.11.0