From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932513AbdJ0U1u (ORCPT ); Fri, 27 Oct 2017 16:27:50 -0400 Received: from mga14.intel.com ([192.55.52.115]:26425 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752860AbdJ0U1f (ORCPT ); Fri, 27 Oct 2017 16:27:35 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.44,305,1505804400"; d="scan'208";a="168155207" From: Ricardo Neri To: Ingo Molnar , Thomas Gleixner , "H. Peter Anvin" , Andy Lutomirski , Borislav Petkov Cc: Peter Zijlstra , Andrew Morton , Brian Gerst , Chris Metcalf , Dave Hansen , Paolo Bonzini , Masami Hiramatsu , Huang Rui , Jiri Slaby , Jonathan Corbet , "Michael S. Tsirkin" , Paul Gortmaker , Vlastimil Babka , Chen Yucong , "Ravi V. Shankar" , Shuah Khan , linux-kernel@vger.kernel.org, x86@kernel.org, ricardo.neri@intel.com, Ricardo Neri , Adam Buchbinder , Colin Ian King , Lorenzo Stoakes , Qiaowei Ren , Nathan Howard , Adan Hawthorn , Joe Perches Subject: [PATCH v10 06/18] x86/mpx: Use signed variables to compute effective addresses Date: Fri, 27 Oct 2017 13:25:33 -0700 Message-Id: <1509135945-13762-7-git-send-email-ricardo.neri-calderon@linux.intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1509135945-13762-1-git-send-email-ricardo.neri-calderon@linux.intel.com> References: <1509135945-13762-1-git-send-email-ricardo.neri-calderon@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Even though memory addresses are unsigned, the operands used to compute the effective address do have a sign. This is true for ModRM.rm, SIB.base, SIB.index as well as the displacement bytes. Thus, signed variables shall be used when computing the effective address from these operands. Once the signed effective address has been computed, it is casted to an unsigned long to determine the linear address. Variables are renamed to better reflect the type of address being computed. Cc: Borislav Petkov Cc: Andy Lutomirski Cc: Dave Hansen Cc: Adam Buchbinder Cc: Colin Ian King Cc: Lorenzo Stoakes Cc: Qiaowei Ren Cc: Peter Zijlstra Cc: Nathan Howard Cc: Adan Hawthorn Cc: Joe Perches Cc: Ravi V. Shankar Cc: x86@kernel.org Reviewed-by: Borislav Petkov Signed-off-by: Ricardo Neri --- arch/x86/mm/mpx.c | 20 ++++++++++++++------ 1 file changed, 14 insertions(+), 6 deletions(-) diff --git a/arch/x86/mm/mpx.c b/arch/x86/mm/mpx.c index f4c48a0..57e5bf5 100644 --- a/arch/x86/mm/mpx.c +++ b/arch/x86/mm/mpx.c @@ -138,8 +138,9 @@ static int get_reg_offset(struct insn *insn, struct pt_regs *regs, */ static void __user *mpx_get_addr_ref(struct insn *insn, struct pt_regs *regs) { - unsigned long addr = -1L, base, indx; int addr_offset, base_offset, indx_offset; + unsigned long linear_addr = -1L; + long eff_addr, base, indx; insn_byte_t sib; insn_get_modrm(insn); @@ -150,7 +151,8 @@ static void __user *mpx_get_addr_ref(struct insn *insn, struct pt_regs *regs) addr_offset = get_reg_offset(insn, regs, REG_TYPE_RM); if (addr_offset < 0) goto out; - addr = regs_get_register(regs, addr_offset); + + eff_addr = regs_get_register(regs, addr_offset); } else { if (insn->sib.nbytes) { base_offset = get_reg_offset(insn, regs, REG_TYPE_BASE); @@ -163,17 +165,23 @@ static void __user *mpx_get_addr_ref(struct insn *insn, struct pt_regs *regs) base = regs_get_register(regs, base_offset); indx = regs_get_register(regs, indx_offset); - addr = base + indx * (1 << X86_SIB_SCALE(sib)); + + eff_addr = base + indx * (1 << X86_SIB_SCALE(sib)); } else { addr_offset = get_reg_offset(insn, regs, REG_TYPE_RM); if (addr_offset < 0) goto out; - addr = regs_get_register(regs, addr_offset); + + eff_addr = regs_get_register(regs, addr_offset); } - addr += insn->displacement.value; + + eff_addr += insn->displacement.value; } + + linear_addr = (unsigned long)eff_addr; + out: - return (void __user *)addr; + return (void __user *)linear_addr; } static int mpx_insn_decode(struct insn *insn, -- 2.7.4