Hi,
I'm interested in mediating accesses by the UML guest kernel to
memory used by the UML guest processes. At present, I'm looking at a
scenario using SKAS3, so the kernel has an address space distinct
from that of the user processes. I guess I'm a bit confused as to
how the guest kernel actually manages to touch guest process memory
(e.g., for copying system call arguments). Looking through /arch/um/
kernel/skas/uaccess.c, it appears that all of these accesses devolve
to performing a strncpy or memcpy, but I don't see a translation from
an address in the user's address space to one in the kernel's address
space. Does this happen somewhere else, or am I misunderstanding
SKAS? Looking through the documentation on the site, I was unable to
find any diagrams or explanations for how the guest kernel actually
lays out memory in its address space. Any comments or suggestions
would be greatly appreciated!
Bryan
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