From 2d0278e6d7ed487d940be0df2b06383db1fcde7a Mon Sep 17 00:00:00 2001 From: Carlos Eduardo Seo Date: Mon, 18 Jul 2022 14:47:32 -0300 Subject: 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 --- sysdeps/aarch64/morello/cheri_perms.h | 66 +++++++++++++++++++++++++++++++++++ 1 file changed, 66 insertions(+) create mode 100644 sysdeps/aarch64/morello/cheri_perms.h (limited to 'sysdeps') 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 -- cgit 1.4.1