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| author | Tim Deegan <tim@xen.org> | 2012-03-08 16:40:05 +0000 |
|---|---|---|
| committer | Tim Deegan <tim@xen.org> | 2012-03-08 16:40:05 +0000 |
| commit | 90b6e6c88983250742e1356d7178a6d4e683fa80 (patch) | |
| tree | cb07b08d3dbb9490f0a865780789cb887dd61c51 /tools/tests | |
| parent | dac9bb57eca774e5ab6189c5ff71b38cd5aec701 (diff) | |
| download | xen-90b6e6c88983250742e1356d7178a6d4e683fa80.tar.gz xen-90b6e6c88983250742e1356d7178a6d4e683fa80.tar.bz2 xen-90b6e6c88983250742e1356d7178a6d4e683fa80.zip | |
Tools: After a helper maps a ring, yank it from the guest physmap
This limits the ability of the guest to play around with its own rings, and DoS
itself.
Signed-off-by: Andres Lagar-Cavilla <andres@lagarcavilla.org>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Committed-by: Tim Deegan <tim@xen.org>
Diffstat (limited to 'tools/tests')
| -rw-r--r-- | tools/tests/xen-access/xen-access.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/tools/tests/xen-access/xen-access.c b/tools/tests/xen-access/xen-access.c index fce886432a..b861aff323 100644 --- a/tools/tests/xen-access/xen-access.c +++ b/tools/tests/xen-access/xen-access.c @@ -269,6 +269,11 @@ xenaccess_t *xenaccess_init(xc_interface **xch_r, domid_t domain_id) (mem_event_sring_t *)xenaccess->mem_event.ring_page, PAGE_SIZE); + /* Now that the ring is set, remove it from the guest's physmap */ + if ( xc_domain_decrease_reservation_exact(xch, + xenaccess->mem_event.domain_id, 1, 0, &ring_pfn) ) + PERROR("Failed to remove ring from guest physmap"); + /* Get platform info */ xenaccess->platform_info = malloc(sizeof(xc_platform_info_t)); if ( xenaccess->platform_info == NULL ) |