C Turt reports that the driver is not thread safe and may have
exploitable races.
Note that the proto device is intended for prototyping and development,
and is not for use on production systems. From the man page:
SECURITY CONSIDERATIONS
Because programs have direct access to the hardware, the proto
driver is inherently insecure. It is not advisable to use this
driver on a production machine.
The proto device is not included in any of FreeBSD's kernel config files
(although the module is built).
The issues in the proto device still need to be fixed, and the device is
inherently (and intentionally) insecure, but it might as well be limited
to root only.
admbugs: 782
Reported by: C Turt <ecturt@gmail.com>
MFC after: 3 days
Sponsored by: The FreeBSD Foundation
Create a special resource (= device special file) for management
of tags and maps, as well as for mapping memory into the address
space. DMA resources are managed using the PROTO_IOC_BUSDMA ioctl.
Part 1 implements tag creation, derivation and destruction.
It exposes I/O resources to user space, so that programs can peek
and poke at the hardware. It does not itself have knowledge about
the hardware device it attaches to.
Sponsored by: Juniper Networks, Inc.
