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LCleanedupPtr < typename T > LCleanedupHandle < typename T > LCleanedupRef < typename T > LCleanedupArray < typename T > LCleanedupGuard Table 7-1
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Manage object pointers Free memory when leaving scope Manage resource objects (eg, RFs & rfs) Call Close() when leaving scope Manage a reference to a resource object (eg, RFs & rfs) Call Close() when leaving scope Manage an array of object pointers Free all memory when leaving scope (Prefer RArray) Automatic management of generic objects
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Local Variable Automatic Resource Management
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LManagedPtr < typename T > LManagedHandle < typename T > LManagedRef < typename T > LManagedArray < typename T > LManagedGuard Table 7-2
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Manage object pointers Free memory when leaving scope Manage resource objects (eg, RFs & rfs) Call Close() when leaving scope Manage a reference to a resource object (eg, RFs & rfs) Call Close() when leaving scope Manage an array of object pointers Free all memory when leaving scope (Prefer RArray) Automatic management of generic objects
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Class Member Variable Automatic Resource Management
LManagedXXX/LCleanedupXXX objects goes out of scope In the following example, the handle to the file server and to an open file are automatically closed and released when the function ends:
void readFileL(LString filename, LString data) { LCleanedupHandle<RFs> fs; LCleanedupHandle<RFile> file; TInt size; fs->Connect() OR_LEAVE; file->Open(*fs, filename, EFileRead) OR_LEAVE; file->Size(size) OR_LEAVE; dataSetLengthL(0); dataReserveFreeCapacityL(size); file->Read(data) OR_LEAVE; }
And in the following example, the CMessageDigest object that is allocated in the constructor of the CUseful class is automatically cleaned up when an instance goes out of scope The destructor does not need to do anything to prevent memory leaks
class CUseful : public CBase { public: CONSTRUCTORS_MAY_LEAVE CUseful() : hash(CMessageDigestFactory::NewHMACL( CMessageDigest::ESHA1, HMACKey)) { }
7: SymbianOS Security
~CUseful() { } private: LManagedPtr< CMessageDigest > hash; };
The different groups of classes, LCleanedupXXX and LManagedXXX, arise due to interaction with the cleanup stack Indeed, if the LCleanedupXXX classes were used for class member variables, then objects would be popped and destroyed from the cleanup stack out of order Use of these classes is recommended in order to reduce the possibility of manual memory management errors, such as memory leaks, double frees, null pointer dereferences, and so on
Automatic Protection Mechanisms
SymbianOS does not guarantee the presence of any automatic protection mechanisms to mitigate memory corruption vulnerabilities Neither address space layout randomization nor stack canaries are available in any form A nonexecutable stack is only available when run on hardware that supports it namely, ARMv6 and ARMv7, but not ARMv5 Although such mechanisms are not perfect in preventing the exploitation, they do increase the level of skill required to craft a successful exploit Because they are not present, developers must continue to be exceptionally careful to reduce the risk of code execution vulnerabilities
PIPS and OpenC
PIPS is a POSIX compatibility layer that aides in the rapid porting of software to SymbianOS-based phones OpenC is an S60 extension of PIPS that brings a larger set of ported libraries These environments are not suitable for GUI code, which must continue to be written in Symbian C++ PIPS and OpenC are implemented as shared libraries that are linked into native code applications This means that applications written for either of these environments suffer from all of the same memory corruption flaws In fact, it is more likely to have such problems because the environment does not provide safer alternatives namely, descriptors and array classes As such, string handling is performed with C-style strings and the associated set of blatantly unsafe functions, such as strcat and strcpy
Mobile Application Security
PIPS and OpenC should only be used for POSIX code ported from other platforms, not for newly written code for the SymbianOS platform
Application Packaging
After developing an application, it must somehow be distributed to end-users in a manner that they can use After all, you can t distribute the source code and expect users to know how to compile the source code into the appropriate format for their phone Further, simply providing compiled binaries is also not enough Where are they supposed to be located on storage How do users know that the applications they have received have not been tampered with Applications for the Symbian platform are compiled into a modified version of the ELF executable format known as E32Image that supports Symbian specific requirements Since access to the local file system is restricted via capabilities; installation of applications is managed by a privileged process on the device Applications are provided to end-users in an archive format that provides instructions to this installation gatekeeper on where to place the final applications
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