x86/xen: allow userspace access during hypercalls

Browse source

commit c54590cac5 upstream.

Userspace application can do a hypercall through /dev/xen/privcmd, and
some for some hypercalls argument is a pointers to user-provided
structure. When SMAP is supported and enabled, hypervisor can't access.
So, lets allow it.

The same applies to HYPERVISOR_dm_op, where additionally privcmd driver
carefully verify buffer addresses.

Signed-off-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
[bwh: Backported to 3.16: drop change in HYPERVISOR_dm_op()]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

...

This commit is contained in:

Marek Marczykowski-Górecki 2017-06-26 14:49:46 +02:00 • committed by Ben Hutchings

parent a1e3e81b6d

commit 2b211fd62a

1 changed files with 3 additions and 0 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

3

arch/x86/include/asm/xen/hypercall.h

View file