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| author | Carlos Eduardo Seo <carlos.seo@arm.com> | 2022-07-18 14:47:32 -0300 |
|---|---|---|
| committer | Szabolcs Nagy <szabolcs.nagy@arm.com> | 2022-08-05 19:45:19 +0100 |
| commit | 2d0278e6d7ed487d940be0df2b06383db1fcde7a (patch) | |
| tree | de889ebbe2cd5dfd4c5fb4367418ca3829efec48 /sysdeps | |
| parent | 822571c5b10a0f10950b0a095df82afe460aeb15 (diff) | |
| download | glibc-2d0278e6d7ed487d940be0df2b06383db1fcde7a.tar.gz glibc-2d0278e6d7ed487d940be0df2b06383db1fcde7a.tar.xz glibc-2d0278e6d7ed487d940be0df2b06383db1fcde7a.zip | |
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
Diffstat (limited to 'sysdeps')
| -rw-r--r-- | sysdeps/aarch64/morello/cheri_perms.h | 66 |
1 files changed, 66 insertions, 0 deletions
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 + <https://www.gnu.org/licenses/>. */ + +#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 |