Opened 7 years ago
Last modified 7 years ago
#17481 new defect
VM crashes when allocating memory at MSR_LSTAR address range
| Reported by: | D1W0U | Owned by: | |
|---|---|---|---|
| Component: | other | Version: | VirtualBox 5.2.6 |
| Keywords: | MSR_LSTAR, LKM, SYSCALL, memory-allocation, range, crash | Cc: | |
| Guest type: | Linux | Host type: | Windows |
Description
Hi,
I'm developing a Linux LKM, and I tried to reserve memory in the same range of MSR_LSTAR (SYSCALL handler), with vmalloc_node_range().
On the 3rd execution of that function, returning first NULL, second an address and third time NULL, the Guru Mediation spawns.
I'm attaching the source code to reproduce the bug, the log and the screenshot.
Thanks for help.
Attachments (3)
Change History (4)
by , 7 years ago
| Attachment: | crash virtualbox coding arprk.png added |
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comment:1 by , 7 years ago
seems the VM cpu(s) memory is zeroed when allocating in its range as I can see the range for cpu_area_entry_mapping in linux-hwe-4.13.0/Documentation/x86/x86_64/mm.txt:fffffe8000000000 - fffffeffffffffff (=39 bits) cpu_entry_area mapping
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