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A driver may also fail to delete pending deferred procedure calls (DPCs), worker threads, queues and other resources that will cause problems when the driver unloads.Moreover, even when still loaded, the driver should delete items when no longer needed, e.g., a timer maintained by the kernel for a driver may cause a write to a block of memory no longer allocated to the driver.
For example, a driver may have a bug that does not arise unless memory is low, and then possibly only intermittently, whereby a test system will not reproduce the error because it does not reproduce the conditions.
In sum, kernel components such as drivers need to be privileged, which makes even slight errors therein capable of crashing the system, yet such errors are often difficult to detect, difficult to match to the source of the problem and/or difficult to reproduce.
If so, the header information including the block size is used to coalesce the adjacent blocks.
However, while this mechanism is highly efficient in satisfying requests for memory allocations and then recombining deallocated memory, if an errant kernel component writes beyond its allocated memory block, it overwrites the header of the subsequent block.
A method and system for verifying computer system drivers such as kernel mode drivers.
A driver verifier sets up tests for specified drivers and monitors the driver's behavior for selected violations that cause system crashes.
Consequently, such components are highly privileged in the operations that they are allowed to perform, and moreover, do not have the same protection mechanisms as higher level (i.e., user mode) components.
As a result, even the slightest error in a kernel component can corrupt the system and cause a system crash.
The driver verifier may also provide extreme memory pressure on a specific driver, or randomly fail requests for pool memory.
The driver verifier also checks call parameters for violations, performs checks to ensure a driver cleans up timers when deallocating memory and cleans up memory and other resources when unloaded.
Yet another type of error that a kernel component may make is failing to deallocate memory that the component no longer needs, often referred to as a “memory leak.” This can occur, for example, when a driver unloads but still has memory allocated thereto, or even when a driver is loaded but for some reason does not deallocate unneeded memory.Tags: Adult Dating, affair dating, sex dating