https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=210244
Bug ID: 210244
Summary: Logic bug in EFI GetMemoryMap usage
Product: Base System
Version: 10.3-RELEASE
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
There are a couple of places in the sys/boot/efi tree that calls
`BS->GetMemoryMap`. There appears to be a problem with the way it's called
though, due to a corner case.
In some cases, allocating the memory requires to store the memory map can cause
the map to become fragmented; this means a _second_ call to `BS->GetMemoryMap`
can also return EFI_BUFFER_TOO_SMALL. One workaround is to call it in a loop
(with a max of, say 10 times) until the memory needed to store the map doesn't
change.
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