Diffusion FreeBSD src repository - subversion rS338467

Permit supervisor to access user VA space for certain functions only.
rS338467
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Description

Permit supervisor to access user VA space for certain functions only.

This is done by setting SUM (permit Supervisor User Memory access)
bit in sstatus register.

The functions we allow access for are routines in assembly that
explicitly handle crossing the user kernel boundary.

Approved by: re (kib)
Sponsored by: DARPA, AFRL

Details

Provenance

br	Authored on

Parents

rS338466: Fix bug: compare uaddr to VM_MAXUSER_ADDRESS, not to a tmp value

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Event Timeline

br committed rS338467: Permit supervisor to access user VA space for certain functions only..Sep 5 2018, 11:34 AM

Changes (6)

Path

Size

head/

sys/

riscv/

include/

riscv/

rS338467

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head/sys/riscv/include/asm.h

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head/sys/riscv/riscv/copyinout.S

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head/sys/riscv/riscv/exception.S

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head/sys/riscv/riscv/locore.S

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head/sys/riscv/riscv/support.S

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head/sys/riscv/riscv/vm_machdep.c

Permit supervisor to access user VA space for certain functions only.rS338467Actions

Description

Details

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Changes (6)

rS338467

head/sys/riscv/include/asm.h

head/sys/riscv/riscv/copyinout.S

head/sys/riscv/riscv/exception.S

head/sys/riscv/riscv/locore.S

head/sys/riscv/riscv/support.S

head/sys/riscv/riscv/vm_machdep.c

Permit supervisor to access user VA space for certain functions only.
rS338467
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