[Xen-changelog] [xen master] libxl: Do not trust backend for channel in getinfo

[patchbot@xxxxxxx]

commit b3a4560e96a654927a70722aad6a5f68ea2da3e8
Author:     Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
AuthorDate: Wed May 4 15:57:10 2016 +0100
Commit:     Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>
CommitDate: Thu Jun 2 15:53:29 2016 +0100

    libxl: Do not trust backend for channel in getinfo
    
    Do not read the frontend path out of the backend.  We have it in our
    hand.  Likewise the guest (frontend) domid was one of our parameters (!)
    
    This is part of XSA-178.
    
    Signed-off-by: Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>
    Reviewed-by: Wei Liu <wei.liu2@xxxxxxxxxx>
---
 tools/libxl/libxl.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/tools/libxl/libxl.c b/tools/libxl/libxl.c
index 3820137..4193c9c 100644
--- a/tools/libxl/libxl.c
+++ b/tools/libxl/libxl.c
@@ -4066,12 +4066,8 @@ int libxl_device_channel_getinfo(libxl_ctx *ctx, 
uint32_t domid,
 
     val = libxl__xs_read(gc, XBT_NULL, GCSPRINTF("%s/state", fe_path));
     channelinfo->state = val ? strtoul(val, NULL, 10) : -1;
-    channelinfo->frontend = xs_read(ctx->xsh, XBT_NULL,
-                                    GCSPRINTF("%s/frontend",
-                                    channelinfo->backend), NULL);
-    val = libxl__xs_read(gc, XBT_NULL, GCSPRINTF("%s/frontend-id",
-                         channelinfo->backend));
-    channelinfo->frontend_id = val ? strtoul(val, NULL, 10) : -1;
+    channelinfo->frontend = libxl__strdup(NOGC, fe_path);
+    channelinfo->frontend_id = domid;
     val = libxl__xs_read(gc, XBT_NULL, GCSPRINTF("%s/ring-ref", fe_path));
     channelinfo->rref = val ? strtoul(val, NULL, 10) : -1;
     val = libxl__xs_read(gc, XBT_NULL, GCSPRINTF("%s/port", fe_path));
--
generated by git-patchbot for /home/xen/git/xen.git#master

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