diff options
Diffstat (limited to 'meta/recipes-bsp/grub/files/0004-safemath-Add-some-arithmetic-primitives-that-check-f.patch')
| -rw-r--r-- | meta/recipes-bsp/grub/files/0004-safemath-Add-some-arithmetic-primitives-that-check-f.patch | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/meta/recipes-bsp/grub/files/0004-safemath-Add-some-arithmetic-primitives-that-check-f.patch b/meta/recipes-bsp/grub/files/0004-safemath-Add-some-arithmetic-primitives-that-check-f.patch new file mode 100644 index 0000000000..29021e8d8f --- /dev/null +++ b/meta/recipes-bsp/grub/files/0004-safemath-Add-some-arithmetic-primitives-that-check-f.patch @@ -0,0 +1,94 @@ +From 06c361a71c4998635493610e5d76d0d223925251 Mon Sep 17 00:00:00 2001 +From: Peter Jones <pjones@redhat.com> +Date: Mon, 15 Jun 2020 10:58:42 -0400 +Subject: [PATCH 5/9] safemath: Add some arithmetic primitives that check for + overflow + +This adds a new header, include/grub/safemath.h, that includes easy to +use wrappers for __builtin_{add,sub,mul}_overflow() declared like: + + bool OP(a, b, res) + +where OP is grub_add, grub_sub or grub_mul. OP() returns true in the +case where the operation would overflow and res is not modified. +Otherwise, false is returned and the operation is executed. + +These arithmetic primitives require newer compiler versions. So, bump +these requirements in the INSTALL file too. + +Upstream-Status: Backport [commit 68708c4503018d61dbcce7ac11cbb511d6425f4d +from https://git.savannah.gnu.org/git/grub.git] + +Signed-off-by: Peter Jones <pjones@redhat.com> +Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com> +[YL: omit the change to INSTALL from original patch] +Signed-off-by: Yongxin Liu <yongxin.liu@windriver.com> +--- + include/grub/compiler.h | 8 ++++++++ + include/grub/safemath.h | 37 +++++++++++++++++++++++++++++++++++++ + 2 files changed, 45 insertions(+) + create mode 100644 include/grub/safemath.h + +diff --git a/include/grub/compiler.h b/include/grub/compiler.h +index c9e1d7a..8f3be3a 100644 +--- a/include/grub/compiler.h ++++ b/include/grub/compiler.h +@@ -48,4 +48,12 @@ + # define WARN_UNUSED_RESULT + #endif + ++#if defined(__clang__) && defined(__clang_major__) && defined(__clang_minor__) ++# define CLANG_PREREQ(maj,min) \ ++ ((__clang_major__ > (maj)) || \ ++ (__clang_major__ == (maj) && __clang_minor__ >= (min))) ++#else ++# define CLANG_PREREQ(maj,min) 0 ++#endif ++ + #endif /* ! GRUB_COMPILER_HEADER */ +diff --git a/include/grub/safemath.h b/include/grub/safemath.h +new file mode 100644 +index 0000000..c17b89b +--- /dev/null ++++ b/include/grub/safemath.h +@@ -0,0 +1,37 @@ ++/* ++ * GRUB -- GRand Unified Bootloader ++ * Copyright (C) 2020 Free Software Foundation, Inc. ++ * ++ * GRUB is free software: you can redistribute it and/or modify ++ * it under the terms of the GNU General Public License as published by ++ * the Free Software Foundation, either version 3 of the License, or ++ * (at your option) any later version. ++ * ++ * GRUB 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 General Public License for more details. ++ * ++ * You should have received a copy of the GNU General Public License ++ * along with GRUB. If not, see <http://www.gnu.org/licenses/>. ++ * ++ * Arithmetic operations that protect against overflow. ++ */ ++ ++#ifndef GRUB_SAFEMATH_H ++#define GRUB_SAFEMATH_H 1 ++ ++#include <grub/compiler.h> ++ ++/* These appear in gcc 5.1 and clang 3.8. */ ++#if GNUC_PREREQ(5, 1) || CLANG_PREREQ(3, 8) ++ ++#define grub_add(a, b, res) __builtin_add_overflow(a, b, res) ++#define grub_sub(a, b, res) __builtin_sub_overflow(a, b, res) ++#define grub_mul(a, b, res) __builtin_mul_overflow(a, b, res) ++ ++#else ++#error gcc 5.1 or newer or clang 3.8 or newer is required ++#endif ++ ++#endif /* GRUB_SAFEMATH_H */ +-- +2.14.4 + |