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| CodeSonar® 9.0p0 Hot Tips | CONFIDENTIAL | CodeSecure Inc |
A function that is supposed to use or release a dynamically-allocated resource is called with a pointer that is not at the start of the allocated object.
| Class Name | Misaligned Object | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Significance | security | ||||||||||||
| Mnemonic | ALLOC.MO | ||||||||||||
| Categories |
|
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| Availability | Available for C and C++. |
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| Enabling | Checks for this warning class are enabled by
default. To disable them, add the following WARNING_FILTER rule to the
project configuration file.
WARNING_FILTER += discard class="Misaligned Object" |
CodeSonar ships with library models that allow it to recognize a large number of functions that use or release a dynamically-allocated resource, across many different libraries. Some examples are shown in the table below. If one of these functions is called with a pointer argument that does not point to the beginning of the allocated object, a warning will be issued.
If you have created a custom library model for some function f() in terms of one of these existing models, calls to f() will also be capable of triggering Misaligned Object warnings.
| Functions that can trigger warnings include... | |
|---|---|
| Apache Portable Runtime (APR) | apr_palloc(), apr_pstrcat() |
| C++ operators | operator delete() |
| FreeRTOS | vQueueDelete() |
| gcc Builtins | __builtin___fprintf_chk(), __builtin_fputc() |
| LDAP | ldap_msgfree() |
| libc | fgetc(), kvm_close() |
| Linux Kernel | free_page(), kfree_() |
| Mac OS X | _FREE(), thread_deallocate() |
| Nucleus | DMCE_Deallocate_Memory(), PMCE_Delete_Partition_Pool() |
| OpenSSL | CRYPTO_free(), CRYPTO_realloc() |
| Qt | qFree(), qRealloc() |
| VxWorks | lstFree(), semDelete() |
| Win32 | CloseHandle(), fscanf_s() |
Japanese (ja)
#include <stdlib.h>
void misaligned_object(void){
char * p = malloc( 10 );
if (!p){
return;
}
free(p + 1); /* 'Misaligned Object' warning issued here */
}
The following configuration file parameters affect checks for this warning class.