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RIP part 2
| November 24, 2018
| November 24, 2018
| [[User:hexkyz|hexkyz]]
| [[User:hexkyz|hexkyz]]
|-
| Infoleak in nvservices system module
| The [[NV_services|nvservices]] ioctl [[NV_services#NVMAP_IOC_ALLOC|NVMAP_IOC_ALLOC]] takes an optional argument "addr" which allows the calling process to pass a pointer to user allocated memory for backing a nvmap object. If "addr" is left as 0, nvservices uses the transfer memory region (donated by the user during initialization) instead, when allocating memory for the nvmap object.
By design, freeing the nvmap object by calling the ioctl [[NV_services#NVMAP_IOC_FREE|NVMAP_IOC_FREE]] returns, in its "refcount" argument, the user address previously supplied if the reference count reaches 0.
However, prior to [[6.2.0]], the case where the transfer memory region is used to allocate the nvmap object was not taken into account, thus resulting in [[NV_services#NVMAP_IOC_FREE|NVMAP_IOC_FREE]] leaking back an address from within the transfer memory region mapped in nvservices' memory space.
In [[6.2.0]], [[NV_services#NVMAP_IOC_FREE|NVMAP_IOC_FREE]] no longer returns the address when the transfer memory region is used instead of user supplied memory.
| Combined with other vulnerabilities: Defeating ASLR in nvservices sysmodule.
| [[6.2.0]]
| [[6.2.0]]
| April 2017
| November 24, 2018
| Everyone
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