From owner-svn-src-head@freebsd.org Wed Aug 12 20:33:29 2020 Return-Path: Delivered-To: svn-src-head@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 CF1D23AA060; Wed, 12 Aug 2020 20:33:29 +0000 (UTC) (envelope-from jhb@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 4BRhHF54n2z4MxC; Wed, 12 Aug 2020 20:33:29 +0000 (UTC) (envelope-from jhb@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 925B711C17; Wed, 12 Aug 2020 20:33:29 +0000 (UTC) (envelope-from jhb@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id 07CKXTP4046820; Wed, 12 Aug 2020 20:33:29 GMT (envelope-from jhb@FreeBSD.org) Received: (from jhb@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id 07CKXTIm046819; Wed, 12 Aug 2020 20:33:29 GMT (envelope-from jhb@FreeBSD.org) Message-Id: <202008122033.07CKXTIm046819@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: jhb set sender to jhb@FreeBSD.org using -f From: John Baldwin Date: Wed, 12 Aug 2020 20:33:29 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r364181 - head/sys/riscv/riscv X-SVN-Group: head X-SVN-Commit-Author: jhb X-SVN-Commit-Paths: head/sys/riscv/riscv X-SVN-Commit-Revision: 364181 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.33 Precedence: list List-Id: SVN commit messages for the src tree for head/-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 12 Aug 2020 20:33:29 -0000 Author: jhb Date: Wed Aug 12 20:33:29 2020 New Revision: 364181 URL: https://svnweb.freebsd.org/changeset/base/364181 Log: Check that the frame pointer is within the current stack. This same check is used on other architectures. Previously this would permit a stack frame to unwind into any arbitrary kernel address (including unmapped addresses). Reviewed by: mhorne Obtained from: CheriBSD Sponsored by: DARPA Differential Revision: https://reviews.freebsd.org/D25996 Modified: head/sys/riscv/riscv/stack_machdep.c Modified: head/sys/riscv/riscv/stack_machdep.c ============================================================================== --- head/sys/riscv/riscv/stack_machdep.c Wed Aug 12 20:29:49 2020 (r364180) +++ head/sys/riscv/riscv/stack_machdep.c Wed Aug 12 20:33:29 2020 (r364181) @@ -47,15 +47,18 @@ __FBSDID("$FreeBSD$"); #include static void -stack_capture(struct stack *st, struct unwind_state *frame) +stack_capture(struct thread *td, struct stack *st, struct unwind_state *frame) { stack_zero(st); while (1) { + if ((vm_offset_t)frame->fp < td->td_kstack || + (vm_offset_t)frame->fp >= td->td_kstack + + td->td_kstack_pages * PAGE_SIZE) + break; unwind_frame(frame); - if (!INKERNEL((vm_offset_t)frame->fp) || - !INKERNEL((vm_offset_t)frame->pc)) + if (!INKERNEL((vm_offset_t)frame->pc)) break; if (stack_put(st, frame->pc) == -1) break; @@ -78,7 +81,7 @@ stack_save_td(struct stack *st, struct thread *td) frame.fp = td->td_pcb->pcb_s[0]; frame.pc = td->td_pcb->pcb_ra; - stack_capture(st, &frame); + stack_capture(td, st, &frame); return (0); } @@ -94,5 +97,5 @@ stack_save(struct stack *st) frame.fp = (uintptr_t)__builtin_frame_address(0); frame.pc = (uintptr_t)stack_save; - stack_capture(st, &frame); + stack_capture(curthread, st, &frame); }