From owner-svn-src-stable-12@freebsd.org Sun Aug 23 19:20:39 2020 Return-Path: Delivered-To: svn-src-stable-12@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 43FDC3C53B1; Sun, 23 Aug 2020 19:20:39 +0000 (UTC) (envelope-from trasz@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 "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4BZQ8718Mdz40wx; Sun, 23 Aug 2020 19:20:39 +0000 (UTC) (envelope-from trasz@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id E6313C1A7; Sun, 23 Aug 2020 19:20:38 +0000 (UTC) (envelope-from trasz@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id 07NJKco0056413; Sun, 23 Aug 2020 19:20:38 GMT (envelope-from trasz@FreeBSD.org) Received: (from trasz@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id 07NJKcD8056412; Sun, 23 Aug 2020 19:20:38 GMT (envelope-from trasz@FreeBSD.org) Message-Id: <202008231920.07NJKcD8056412@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: trasz set sender to trasz@FreeBSD.org using -f From: Edward Tomasz Napierala Date: Sun, 23 Aug 2020 19:20:38 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-12@freebsd.org Subject: svn commit: r364504 - stable/12/sys/amd64/linux X-SVN-Group: stable-12 X-SVN-Commit-Author: trasz X-SVN-Commit-Paths: stable/12/sys/amd64/linux X-SVN-Commit-Revision: 364504 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-stable-12@freebsd.org X-Mailman-Version: 2.1.33 Precedence: list List-Id: SVN commit messages for only the 12-stable src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 23 Aug 2020 19:20:39 -0000 Author: trasz Date: Sun Aug 23 19:20:38 2020 New Revision: 364504 URL: https://svnweb.freebsd.org/changeset/base/364504 Log: MFC r347580: Fix handling of r10 in Linux ptrace(2). This fixes decoding of the 'flags' argument to mmap(2) with Linux strace(1). Sponsored by: The FreeBSD Foundation Modified: stable/12/sys/amd64/linux/linux_ptrace.c Directory Properties: stable/12/ (props changed) Modified: stable/12/sys/amd64/linux/linux_ptrace.c ============================================================================== --- stable/12/sys/amd64/linux/linux_ptrace.c Sun Aug 23 19:19:00 2020 (r364503) +++ stable/12/sys/amd64/linux/linux_ptrace.c Sun Aug 23 19:20:38 2020 (r364504) @@ -338,18 +338,27 @@ linux_ptrace_getregs(struct thread *td, pid_t pid, voi map_regs_to_linux(&b_reg, &l_reg); - /* - * The strace(1) utility depends on RAX being set to -ENOSYS - * on syscall entry. - */ error = kern_ptrace(td, PT_LWPINFO, pid, &lwpinfo, sizeof(lwpinfo)); if (error != 0) { printf("%s: PT_LWPINFO failed with error %d\n", __func__, error); return (error); } - if (lwpinfo.pl_flags & PL_FLAG_SCE) - l_reg.rax = -38; // XXX: Don't hardcode? + if (lwpinfo.pl_flags & PL_FLAG_SCE) { + /* + * The strace(1) utility depends on RAX being set to -ENOSYS + * on syscall entry; otherwise it loops printing those: + * + * [ Process PID=928 runs in 64 bit mode. ] + * [ Process PID=928 runs in x32 mode. ] + */ + l_reg.rax = -38; /* -ENOSYS */ + /* + * Undo the mangling done in exception.S:fast_syscall_common(). + */ + l_reg.r10 = l_reg.rcx; + } + error = copyout(&l_reg, (void *)data, sizeof(l_reg)); return (error); } @@ -399,21 +408,27 @@ linux_ptrace_getregset_prstatus(struct thread *td, pid map_regs_to_linux_regset(&b_reg, fsbase, gsbase, &l_regset); - /* - * The strace(1) utility depends on RAX being set to -ENOSYS - * on syscall entry; otherwise it loops printing those: - * - * [ Process PID=928 runs in 64 bit mode. ] - * [ Process PID=928 runs in x32 mode. ] - */ error = kern_ptrace(td, PT_LWPINFO, pid, &lwpinfo, sizeof(lwpinfo)); if (error != 0) { printf("%s: PT_LWPINFO failed with error %d\n", __func__, error); return (error); } - if (lwpinfo.pl_flags & PL_FLAG_SCE) - l_regset.rax = -38; // XXX: Don't hardcode? + if (lwpinfo.pl_flags & PL_FLAG_SCE) { + /* + * The strace(1) utility depends on RAX being set to -ENOSYS + * on syscall entry; otherwise it loops printing those: + * + * [ Process PID=928 runs in 64 bit mode. ] + * [ Process PID=928 runs in x32 mode. ] + */ + l_regset.rax = -38; /* -ENOSYS */ + + /* + * Undo the mangling done in exception.S:fast_syscall_common(). + */ + l_regset.r10 = l_regset.rcx; + } len = MIN(iov.iov_len, sizeof(l_regset)); error = copyout(&l_regset, (void *)iov.iov_base, len);