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authorwolfbeast <mcwerewolf@gmail.com>2018-05-14 10:50:01 +0200
committerwolfbeast <mcwerewolf@gmail.com>2018-05-14 10:50:01 +0200
commite9dd029f5d00590e1a53e63b0ab805110a10b54c (patch)
tree1126ca5dda925a62be3dc12c99c90e953d08afcf /security/sandbox/linux/LinuxCapabilities.h
parent9d6a7ae25d7f5da855a8f8df884de483b4e2a538 (diff)
parent36b8fd734f590eb726ca2e50f8d1ff9cc968b8e1 (diff)
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Merge branch 'master' into Basilisk-release
Diffstat (limited to 'security/sandbox/linux/LinuxCapabilities.h')
-rw-r--r--security/sandbox/linux/LinuxCapabilities.h128
1 files changed, 0 insertions, 128 deletions
diff --git a/security/sandbox/linux/LinuxCapabilities.h b/security/sandbox/linux/LinuxCapabilities.h
deleted file mode 100644
index 9d3220841..000000000
--- a/security/sandbox/linux/LinuxCapabilities.h
+++ /dev/null
@@ -1,128 +0,0 @@
-/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* vim: set ts=8 sts=2 et sw=2 tw=80: */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#ifndef mozilla_LinuxCapabilities_h
-#define mozilla_LinuxCapabilities_h
-
-#include <linux/capability.h>
-#include <stdint.h>
-
-#include "mozilla/Assertions.h"
-#include "mozilla/Attributes.h"
-#include "mozilla/PodOperations.h"
-
-// This class is a relatively simple interface to manipulating the
-// capabilities of a Linux process/thread; see the capabilities(7) man
-// page for background information.
-
-// Unfortunately, Android's kernel headers omit some definitions
-// needed for the low-level capability interface. They're part of the
-// stable syscall ABI, so it's safe to include them here.
-#ifndef _LINUX_CAPABILITY_VERSION_3
-#define _LINUX_CAPABILITY_VERSION_3 0x20080522
-#define _LINUX_CAPABILITY_U32S_3 2
-#endif
-#ifndef CAP_TO_INDEX
-#define CAP_TO_INDEX(x) ((x) >> 5)
-#define CAP_TO_MASK(x) (1 << ((x) & 31))
-#endif
-
-namespace mozilla {
-
-class LinuxCapabilities final
-{
-public:
- // A class to represent a bit within the capability sets as an lvalue.
- class BitRef {
- __u32& mWord;
- __u32 mMask;
- friend class LinuxCapabilities;
- BitRef(__u32& aWord, uint32_t aMask) : mWord(aWord), mMask(aMask) { }
- BitRef(const BitRef& aBit) : mWord(aBit.mWord), mMask(aBit.mMask) { }
- public:
- MOZ_IMPLICIT operator bool() const {
- return mWord & mMask;
- }
- BitRef& operator=(bool aSetTo) {
- if (aSetTo) {
- mWord |= mMask;
- } else {
- mWord &= mMask;
- }
- return *this;
- }
- };
-
- // The default value is the empty set.
- LinuxCapabilities() { PodArrayZero(mBits); }
-
- // Get the current thread's capability sets and assign them to this
- // object. Returns whether it succeeded and sets errno on failure.
- // Shouldn't fail unless the kernel is very old.
- bool GetCurrent();
-
- // Try to set the current thread's capability sets to those
- // specified in this object. Returns whether it succeeded and sets
- // errno on failure.
- bool SetCurrentRaw() const;
-
- // The capability model requires that the permitted set always be a
- // superset of the effective and inheritable sets. This method
- // expands the permitted set as needed and then sets the current
- // thread's capabilities, as described above.
- bool SetCurrent() {
- Normalize();
- return SetCurrentRaw();
- }
-
- void Normalize() {
- for (size_t i = 0; i < _LINUX_CAPABILITY_U32S_3; ++i) {
- mBits[i].permitted |= mBits[i].effective | mBits[i].inheritable;
- }
- }
-
- bool AnyEffective() const {
- for (size_t i = 0; i < _LINUX_CAPABILITY_U32S_3; ++i) {
- if (mBits[i].effective != 0) {
- return true;
- }
- }
- return false;
- }
-
- // These three methods expose individual bits in the three
- // capability sets as objects that can be used as bool lvalues.
- // The argument is the capability number, as defined in
- // the <linux/capability.h> header.
- BitRef Effective(unsigned aCap)
- {
- return GenericBitRef(&__user_cap_data_struct::effective, aCap);
- }
-
- BitRef Permitted(unsigned aCap)
- {
- return GenericBitRef(&__user_cap_data_struct::permitted, aCap);
- }
-
- BitRef Inheritable(unsigned aCap)
- {
- return GenericBitRef(&__user_cap_data_struct::inheritable, aCap);
- }
-
-private:
- __user_cap_data_struct mBits[_LINUX_CAPABILITY_U32S_3];
-
- BitRef GenericBitRef(__u32 __user_cap_data_struct::* aField, unsigned aCap)
- {
- // Please don't pass untrusted data as the capability number.
- MOZ_ASSERT(CAP_TO_INDEX(aCap) < _LINUX_CAPABILITY_U32S_3);
- return BitRef(mBits[CAP_TO_INDEX(aCap)].*aField, CAP_TO_MASK(aCap));
- }
-};
-
-} // namespace mozilla
-
-#endif // mozilla_LinuxCapabilities_h