x86/xen: allow userspace access during hypercalls

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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.

Cc: stable@vger.kernel.org
Signed-off-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Juergen Gross <jgross@suse.com>

...

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

parent bf1b9ddf18

commit c54590cac5

1 changed files with 8 additions and 1 deletions

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

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