Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754621Ab0BIWzc (ORCPT ); Tue, 9 Feb 2010 17:55:32 -0500 Received: from hera.kernel.org ([140.211.167.34]:34804 "EHLO hera.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753761Ab0BIWza (ORCPT ); Tue, 9 Feb 2010 17:55:30 -0500 Date: Tue, 9 Feb 2010 22:55:13 GMT From: tip-bot for Suresh Siddha Cc: linux-kernel@vger.kernel.org, hpa@zytor.com, mingo@redhat.com, suresh.b.siddha@intel.com, tglx@linutronix.de Reply-To: mingo@redhat.com, hpa@zytor.com, linux-kernel@vger.kernel.org, suresh.b.siddha@intel.com, tglx@linutronix.de In-Reply-To: <20100209202502.310242237@sbs-t61.sc.intel.com> References: <20100209202502.310242237@sbs-t61.sc.intel.com> To: linux-tip-commits@vger.kernel.org Subject: [tip:x86/ptrace] x86, ptrace: Prepare regset get/set routines for user specified lengths Message-ID: Git-Commit-ID: a6bf9383255e088f5a78d93e2f8cd871aa028060 X-Mailer: tip-git-log-daemon MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.2.3 (hera.kernel.org [127.0.0.1]); Tue, 09 Feb 2010 22:55:15 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3897 Lines: 107 Commit-ID: a6bf9383255e088f5a78d93e2f8cd871aa028060 Gitweb: http://git.kernel.org/tip/a6bf9383255e088f5a78d93e2f8cd871aa028060 Author: Suresh Siddha AuthorDate: Tue, 9 Feb 2010 12:13:12 -0800 Committer: H. Peter Anvin CommitDate: Tue, 9 Feb 2010 14:09:58 -0800 x86, ptrace: Prepare regset get/set routines for user specified lengths Prepare the x86 regset routines for the upcoming generic PTRACE_GETREGSET/PTRACE_SETREGSET commands. These commands allow the user to specify how much to read and hence the kernel needs to ensure that the get/set routines of the regset don't allow the user to access more kernel buffers than needed. Signed-off-by: Suresh Siddha LKML-Reference: <20100209202502.310242237@sbs-t61.sc.intel.com> Signed-off-by: H. Peter Anvin --- arch/x86/kernel/i387.c | 15 ++++++++++----- 1 files changed, 10 insertions(+), 5 deletions(-) diff --git a/arch/x86/kernel/i387.c b/arch/x86/kernel/i387.c index 4719bf9..23efdef 100644 --- a/arch/x86/kernel/i387.c +++ b/arch/x86/kernel/i387.c @@ -184,6 +184,7 @@ int xfpregs_get(struct task_struct *target, const struct user_regset *regset, void *kbuf, void __user *ubuf) { int ret; + int size = regset->n * regset->size; if (!cpu_has_fxsr) return -ENODEV; @@ -193,7 +194,7 @@ int xfpregs_get(struct task_struct *target, const struct user_regset *regset, return ret; return user_regset_copyout(&pos, &count, &kbuf, &ubuf, - &target->thread.xstate->fxsave, 0, -1); + &target->thread.xstate->fxsave, 0, size); } int xfpregs_set(struct task_struct *target, const struct user_regset *regset, @@ -201,6 +202,7 @@ int xfpregs_set(struct task_struct *target, const struct user_regset *regset, const void *kbuf, const void __user *ubuf) { int ret; + int size = regset->n * regset->size; if (!cpu_has_fxsr) return -ENODEV; @@ -210,7 +212,7 @@ int xfpregs_set(struct task_struct *target, const struct user_regset *regset, return ret; ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, - &target->thread.xstate->fxsave, 0, -1); + &target->thread.xstate->fxsave, 0, size); /* * mxcsr reserved bits must be masked to zero for security reasons. @@ -452,6 +454,7 @@ int fpregs_get(struct task_struct *target, const struct user_regset *regset, void *kbuf, void __user *ubuf) { struct user_i387_ia32_struct env; + int size = regset->n * regset->size; int ret; ret = init_fpu(target); @@ -464,7 +467,7 @@ int fpregs_get(struct task_struct *target, const struct user_regset *regset, if (!cpu_has_fxsr) { return user_regset_copyout(&pos, &count, &kbuf, &ubuf, &target->thread.xstate->fsave, 0, - -1); + size); } if (kbuf && pos == 0 && count == sizeof(env)) { @@ -482,6 +485,7 @@ int fpregs_set(struct task_struct *target, const struct user_regset *regset, const void *kbuf, const void __user *ubuf) { struct user_i387_ia32_struct env; + int size = regset->n * regset->size; int ret; ret = init_fpu(target); @@ -495,13 +499,14 @@ int fpregs_set(struct task_struct *target, const struct user_regset *regset, if (!cpu_has_fxsr) { return user_regset_copyin(&pos, &count, &kbuf, &ubuf, - &target->thread.xstate->fsave, 0, -1); + &target->thread.xstate->fsave, 0, + size); } if (pos > 0 || count < sizeof(env)) convert_from_fxsr(&env, target); - ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &env, 0, -1); + ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &env, 0, size); if (!ret) convert_to_fxsr(target, &env); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/