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authorMaxime Coquelin <maxime.coquelin@redhat.com>2018-03-14 16:46:46 +0100
committerMaxime Coquelin <maxime.coquelin@redhat.com>2018-04-23 17:12:13 +0200
commita3258d299378e33609409b36aebd987bc15033ea (patch)
tree8794e93f86e61417d5937a58ff2aa8a341628e0e
parent82c93a567d3b987f9a93909e2087432450680a63 (diff)
downloaddpdk-a3258d299378e33609409b36aebd987bc15033ea.zip
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examples/vhost_scsi: move to safe GPA translation API
This patch uses the new rte_vhost_va_from_guest_pa() API to ensure all the descriptor buffer is mapped contiguously in the application virtual address space. As the application did not checked return of previous API, this patch just print an error if the buffer address isn't in the vhost memory regions or if it is scattered. Ideally, it should handle scattered buffers gracefully. This issue has been assigned CVE-2018-1059. Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
-rw-r--r--examples/vhost_scsi/vhost_scsi.c56
1 files changed, 47 insertions, 9 deletions
diff --git a/examples/vhost_scsi/vhost_scsi.c b/examples/vhost_scsi/vhost_scsi.c
index 3cb4383..2908ff6 100644
--- a/examples/vhost_scsi/vhost_scsi.c
+++ b/examples/vhost_scsi/vhost_scsi.c
@@ -38,7 +38,7 @@ vhost_scsi_ctrlr_find(__rte_unused const char *ctrlr_name)
return g_vhost_ctrlr;
}
-static uint64_t gpa_to_vva(int vid, uint64_t gpa)
+static uint64_t gpa_to_vva(int vid, uint64_t gpa, uint64_t *len)
{
char path[PATH_MAX];
struct vhost_scsi_ctrlr *ctrlr;
@@ -58,7 +58,7 @@ static uint64_t gpa_to_vva(int vid, uint64_t gpa)
assert(ctrlr->mem != NULL);
- return rte_vhost_gpa_to_vva(ctrlr->mem, gpa);
+ return rte_vhost_va_from_guest_pa(ctrlr->mem, gpa, len);
}
static struct vring_desc *
@@ -108,15 +108,29 @@ static void
vhost_process_read_payload_chain(struct vhost_scsi_task *task)
{
void *data;
+ uint64_t chunck_len;
task->iovs_cnt = 0;
+ chunck_len = task->desc->len;
task->resp = (void *)(uintptr_t)gpa_to_vva(task->bdev->vid,
- task->desc->addr);
+ task->desc->addr,
+ &chunck_len);
+ if (!task->resp || chunck_len != task->desc->len) {
+ fprintf(stderr, "failed to translate desc address.\n");
+ return;
+ }
while (descriptor_has_next(task->desc)) {
task->desc = descriptor_get_next(task->vq->desc, task->desc);
+ chunck_len = task->desc->len;
data = (void *)(uintptr_t)gpa_to_vva(task->bdev->vid,
- task->desc->addr);
+ task->desc->addr,
+ &chunck_len);
+ if (!data || chunck_len != task->desc->len) {
+ fprintf(stderr, "failed to translate desc address.\n");
+ return;
+ }
+
task->iovs[task->iovs_cnt].iov_base = data;
task->iovs[task->iovs_cnt].iov_len = task->desc->len;
task->data_len += task->desc->len;
@@ -128,12 +142,20 @@ static void
vhost_process_write_payload_chain(struct vhost_scsi_task *task)
{
void *data;
+ uint64_t chunck_len;
task->iovs_cnt = 0;
do {
+ chunck_len = task->desc->len;
data = (void *)(uintptr_t)gpa_to_vva(task->bdev->vid,
- task->desc->addr);
+ task->desc->addr,
+ &chunck_len);
+ if (!data || chunck_len != task->desc->len) {
+ fprintf(stderr, "failed to translate desc address.\n");
+ return;
+ }
+
task->iovs[task->iovs_cnt].iov_base = data;
task->iovs[task->iovs_cnt].iov_len = task->desc->len;
task->data_len += task->desc->len;
@@ -141,8 +163,12 @@ vhost_process_write_payload_chain(struct vhost_scsi_task *task)
task->desc = descriptor_get_next(task->vq->desc, task->desc);
} while (descriptor_has_next(task->desc));
+ chunck_len = task->desc->len;
task->resp = (void *)(uintptr_t)gpa_to_vva(task->bdev->vid,
- task->desc->addr);
+ task->desc->addr,
+ &chunck_len);
+ if (!task->resp || chunck_len != task->desc->len)
+ fprintf(stderr, "failed to translate desc address.\n");
}
static struct vhost_block_dev *
@@ -188,6 +214,7 @@ process_requestq(struct vhost_scsi_ctrlr *ctrlr, uint32_t q_idx)
int req_idx;
uint16_t last_idx;
struct vhost_scsi_task *task;
+ uint64_t chunck_len;
last_idx = scsi_vq->last_used_idx & (vq->size - 1);
req_idx = vq->avail->ring[last_idx];
@@ -205,16 +232,27 @@ process_requestq(struct vhost_scsi_ctrlr *ctrlr, uint32_t q_idx)
assert((task->desc->flags & VRING_DESC_F_INDIRECT) == 0);
scsi_vq->last_used_idx++;
+ chunck_len = task->desc->len;
task->req = (void *)(uintptr_t)gpa_to_vva(task->bdev->vid,
- task->desc->addr);
+ task->desc->addr,
+ &chunck_len);
+ if (!task->req || chunck_len != task->desc->len) {
+ fprintf(stderr, "failed to translate desc address.\n");
+ return;
+ }
task->desc = descriptor_get_next(task->vq->desc, task->desc);
if (!descriptor_has_next(task->desc)) {
task->dxfer_dir = SCSI_DIR_NONE;
+ chunck_len = task->desc->len;
task->resp = (void *)(uintptr_t)
gpa_to_vva(task->bdev->vid,
- task->desc->addr);
-
+ task->desc->addr,
+ &chunck_len);
+ if (!task->resp || chunck_len != task->desc->len) {
+ fprintf(stderr, "failed to translate desc address.\n");
+ return;
+ }
} else if (!descriptor_is_wr(task->desc)) {
task->dxfer_dir = SCSI_DIR_TO_DEV;
vhost_process_write_payload_chain(task);