From owner-dev-commits-src-main@freebsd.org Sun May 16 17:44:20 2021 Return-Path: Delivered-To: dev-commits-src-main@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 08AE262A83E; Sun, 16 May 2021 17:44:20 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "R3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4FjqQC6lTjz4tj4; Sun, 16 May 2021 17:44:19 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org (gitrepo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:5]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id CEB071D190; Sun, 16 May 2021 17:44:19 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org ([127.0.1.44]) by gitrepo.freebsd.org (8.16.1/8.16.1) with ESMTP id 14GHiJOM054601; Sun, 16 May 2021 17:44:19 GMT (envelope-from git@gitrepo.freebsd.org) Received: (from git@localhost) by gitrepo.freebsd.org (8.16.1/8.16.1/Submit) id 14GHiJrd054600; Sun, 16 May 2021 17:44:19 GMT (envelope-from git) Date: Sun, 16 May 2021 17:44:19 GMT Message-Id: <202105161744.14GHiJrd054600@gitrepo.freebsd.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org From: Mark Johnston Subject: git: fb580451456a - main - linux: Fix SMAP-enabled futex routines MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Git-Committer: markj X-Git-Repository: src X-Git-Refname: refs/heads/main X-Git-Reftype: branch X-Git-Commit: fb580451456aa769daa2f4b2f077e39692f80c62 Auto-Submitted: auto-generated X-BeenThere: dev-commits-src-main@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Commit messages for the main branch of the src repository List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 16 May 2021 17:44:20 -0000 The branch main has been updated by markj: URL: https://cgit.FreeBSD.org/src/commit/?id=fb580451456aa769daa2f4b2f077e39692f80c62 commit fb580451456aa769daa2f4b2f077e39692f80c62 Author: Mark Johnston AuthorDate: 2021-05-16 17:41:41 +0000 Commit: Mark Johnston CommitDate: 2021-05-16 17:42:08 +0000 linux: Fix SMAP-enabled futex routines Some of them were dereferencing the user pointer before disabling SMAP. PR: 255591 Reviewed by: kib Tested by: pitwuu@gmail.com Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential Revision: https://reviews.freebsd.org/D30276 --- sys/amd64/linux/linux_support.s | 12 ++++++------ sys/amd64/linux32/linux32_support.s | 12 ++++++------ 2 files changed, 12 insertions(+), 12 deletions(-) diff --git a/sys/amd64/linux/linux_support.s b/sys/amd64/linux/linux_support.s index 391f76414f22..45eb565f667d 100644 --- a/sys/amd64/linux/linux_support.s +++ b/sys/amd64/linux/linux_support.s @@ -126,16 +126,16 @@ ENTRY(futex_orl_smap) movq $VM_MAXUSER_ADDRESS-4,%rax cmpq %rax,%rsi ja futex_fault + stac movl (%rsi),%eax 1: movl %eax,%ecx orl %edi,%ecx - stac #ifdef SMP lock #endif cmpxchgl %ecx,(%rsi) - clac jnz 1b + clac movl %eax,(%rdx) xorl %eax,%eax movq %rax,PCB_ONFAULT(%r8) @@ -168,16 +168,16 @@ ENTRY(futex_andl_smap) movq $VM_MAXUSER_ADDRESS-4,%rax cmpq %rax,%rsi ja futex_fault + stac movl (%rsi),%eax 1: movl %eax,%ecx andl %edi,%ecx - stac #ifdef SMP lock #endif cmpxchgl %ecx,(%rsi) - clac jnz 1b + clac movl %eax,(%rdx) xorl %eax,%eax movq %rax,PCB_ONFAULT(%r8) @@ -210,16 +210,16 @@ ENTRY(futex_xorl_smap) movq $VM_MAXUSER_ADDRESS-4,%rax cmpq %rax,%rsi ja futex_fault + stac movl (%rsi),%eax 1: movl %eax,%ecx xorl %edi,%ecx - stac #ifdef SMP lock #endif cmpxchgl %ecx,(%rsi) - clac jnz 1b + clac movl %eax,(%rdx) xorl %eax,%eax movq %rax,PCB_ONFAULT(%r8) diff --git a/sys/amd64/linux32/linux32_support.s b/sys/amd64/linux32/linux32_support.s index 981bba9f5821..f3ec3bd8c776 100644 --- a/sys/amd64/linux32/linux32_support.s +++ b/sys/amd64/linux32/linux32_support.s @@ -126,16 +126,16 @@ ENTRY(futex_orl_smap) movq $VM_MAXUSER_ADDRESS-4,%rax cmpq %rax,%rsi ja futex_fault + stac movl (%rsi),%eax 1: movl %eax,%ecx orl %edi,%ecx - stac #ifdef SMP lock #endif cmpxchgl %ecx,(%rsi) - clac jnz 1b + clac movl %eax,(%rdx) xorl %eax,%eax movq %rax,PCB_ONFAULT(%r8) @@ -169,15 +169,15 @@ ENTRY(futex_andl_smap) cmpq %rax,%rsi ja futex_fault movl (%rsi),%eax + stac 1: movl %eax,%ecx andl %edi,%ecx - stac #ifdef SMP lock #endif cmpxchgl %ecx,(%rsi) - clac jnz 1b + clac movl %eax,(%rdx) xorl %eax,%eax movq %rax,PCB_ONFAULT(%r8) @@ -210,16 +210,16 @@ ENTRY(futex_xorl_smap) movq $VM_MAXUSER_ADDRESS-4,%rax cmpq %rax,%rsi ja futex_fault + stac movl (%rsi),%eax 1: movl %eax,%ecx xorl %edi,%ecx - stac #ifdef SMP lock #endif cmpxchgl %ecx,(%rsi) - clac jnz 1b + clac movl %eax,(%rdx) xorl %eax,%eax movq %rax,PCB_ONFAULT(%r8)