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-rw-r--r--system/xen/xsa/xsa197-qemuu.patch63
1 files changed, 63 insertions, 0 deletions
diff --git a/system/xen/xsa/xsa197-qemuu.patch b/system/xen/xsa/xsa197-qemuu.patch
new file mode 100644
index 0000000000000..f7845cffd2a57
--- /dev/null
+++ b/system/xen/xsa/xsa197-qemuu.patch
@@ -0,0 +1,63 @@
+From: Jan Beulich <jbeulich@suse.com>
+Subject: xen: fix ioreq handling
+
+Avoid double fetches and bounds check size to avoid overflowing
+internal variables.
+
+This is XSA-197.
+
+Reported-by: yanghongke <yanghongke@huawei.com>
+Signed-off-by: Jan Beulich <jbeulich@suse.com>
+Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
+
+--- a/xen-hvm.c
++++ b/xen-hvm.c
+@@ -810,6 +810,10 @@ static void cpu_ioreq_pio(ioreq_t *req)
+ trace_cpu_ioreq_pio(req, req->dir, req->df, req->data_is_ptr, req->addr,
+ req->data, req->count, req->size);
+
++ if (req->size > sizeof(uint32_t)) {
++ hw_error("PIO: bad size (%u)", req->size);
++ }
++
+ if (req->dir == IOREQ_READ) {
+ if (!req->data_is_ptr) {
+ req->data = do_inp(req->addr, req->size);
+@@ -846,6 +850,10 @@ static void cpu_ioreq_move(ioreq_t *req)
+ trace_cpu_ioreq_move(req, req->dir, req->df, req->data_is_ptr, req->addr,
+ req->data, req->count, req->size);
+
++ if (req->size > sizeof(req->data)) {
++ hw_error("MMIO: bad size (%u)", req->size);
++ }
++
+ if (!req->data_is_ptr) {
+ if (req->dir == IOREQ_READ) {
+ for (i = 0; i < req->count; i++) {
+@@ -1010,11 +1018,13 @@ static int handle_buffered_iopage(XenIOS
+ req.df = 1;
+ req.type = buf_req->type;
+ req.data_is_ptr = 0;
++ xen_rmb();
+ qw = (req.size == 8);
+ if (qw) {
+ buf_req = &buf_page->buf_ioreq[(rdptr + 1) %
+ IOREQ_BUFFER_SLOT_NUM];
+ req.data |= ((uint64_t)buf_req->data) << 32;
++ xen_rmb();
+ }
+
+ handle_ioreq(state, &req);
+@@ -1045,7 +1055,11 @@ static void cpu_handle_ioreq(void *opaqu
+
+ handle_buffered_iopage(state);
+ if (req) {
+- handle_ioreq(state, req);
++ ioreq_t copy = *req;
++
++ xen_rmb();
++ handle_ioreq(state, &copy);
++ req->data = copy.data;
+
+ if (req->state != STATE_IOREQ_INPROCESS) {
+ fprintf(stderr, "Badness in I/O request ... not in service?!: "