From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 1944) id 5C02038582A3; Fri, 5 Aug 2022 19:33:13 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 5C02038582A3 Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit From: Szabolcs Nagy To: glibc-cvs@sourceware.org Subject: [glibc/arm/morello/main] cheri: aarch64: Add header for CHERI permissions X-Act-Checkin: glibc X-Git-Author: Carlos Eduardo Seo X-Git-Refname: refs/heads/arm/morello/main X-Git-Oldrev: 822571c5b10a0f10950b0a095df82afe460aeb15 X-Git-Newrev: 2d0278e6d7ed487d940be0df2b06383db1fcde7a Message-Id: <20220805193313.5C02038582A3@sourceware.org> Date: Fri, 5 Aug 2022 19:33:13 +0000 (GMT) X-BeenThere: glibc-cvs@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Glibc-cvs mailing list List-Unsubscribe: , List-Archive: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 05 Aug 2022 19:33:13 -0000 https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=2d0278e6d7ed487d940be0df2b06383db1fcde7a commit 2d0278e6d7ed487d940be0df2b06383db1fcde7a Author: Carlos Eduardo Seo Date: Mon Jul 18 14:47:32 2022 -0300 cheri: aarch64: Add header for CHERI permissions New file containing the capability permission bits. The capability permission bits are defined in the Arm Architecture Reference Manual Suplement- Morello for A-Profile Architecture: https://developer.arm.com/documentation/ddi0606/latest Diff: --- sysdeps/aarch64/morello/cheri_perms.h | 66 +++++++++++++++++++++++++++++++++++ 1 file changed, 66 insertions(+) diff --git a/sysdeps/aarch64/morello/cheri_perms.h b/sysdeps/aarch64/morello/cheri_perms.h new file mode 100644 index 0000000000..8c44233016 --- /dev/null +++ b/sysdeps/aarch64/morello/cheri_perms.h @@ -0,0 +1,66 @@ +/* Copyright (C) 2022 Free Software Foundation, Inc. + + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public License as + published by the Free Software Foundation; either version 2.1 of the + License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#ifndef _AARCH64_MORELLO_CHERI_PERMS_H +#define _AARCH64_MORELLO_CHERI_PERMS_H + +/* Capability permission bits. These are defined in the Arm Architecture + Reference Manual Suplement- Morello for A-Profile Architecture: + https://developer.arm.com/documentation/ddi0606/latest */ +#define CAP_PERM_LOAD (1 << 17) +#define CAP_PERM_STORE (1 << 16) +#define CAP_PERM_EXECUTE (1 << 15) +#define CAP_PERM_LOAD_CAP (1 << 14) +#define CAP_PERM_STORE_CAP (1 << 13) +#define CAP_PERM_STORE_LOCAL (1 << 12) +#define CAP_PERM_SEAL (1 << 11) +#define CAP_PERM_UNSEAL (1 << 10) +#define CAP_PERM_COMPARTMENT_ID (1 << 7) +#define CAP_PERM_MUTABLE_LOAD (1 << 6) +#define CAP_PERM_EXECUTIVE (1 << 1) +#define CAP_PERM_GLOBAL (1 << 0) + +/* Used with __builtin_cheri_perms_and. */ +#define CAP_PERM_MASK_BASE (-1UL ^ ( \ + CAP_PERM_LOAD | \ + CAP_PERM_STORE | \ + CAP_PERM_EXECUTE | \ + CAP_PERM_LOAD_CAP | \ + CAP_PERM_STORE_CAP | \ + CAP_PERM_SEAL | \ + CAP_PERM_UNSEAL | \ + CAP_PERM_COMPARTMENT_ID)) +#define CAP_PERM_MASK_R (CAP_PERM_MASK_BASE | CAP_PERM_LOAD | CAP_PERM_LOAD_CAP) +#define CAP_PERM_MASK_RW (CAP_PERM_MASK_R | CAP_PERM_STORE | CAP_PERM_STORE_CAP) +#define CAP_PERM_MASK_RX (CAP_PERM_MASK_R | CAP_PERM_EXECUTE) + +#define STACK_CAP_PERM_PCS ( \ + CAP_PERM_LOAD | \ + CAP_PERM_STORE | \ + CAP_PERM_LOAD_CAP | \ + CAP_PERM_STORE_CAP | \ + CAP_PERM_MUTABLE_LOAD) + +/* Check if stack is valid according to stack PCS rules. Only permissions + are checked, seal and invalid tag cause fault on access. */ +#define STACK_CAP_CHECK(stack, size) \ + ({unsigned long __perm = __builtin_cheri_perms_get (stack); \ + (__perm & (CAP_PERM_GLOBAL|CAP_PERM_STORE_LOCAL)) \ + && (__perm & STACK_CAP_PERM_PCS) == STACK_CAP_PERM_PCS;}) + +#endif