[Xen-changelog] [xen stable-4.5] libxl: Do not trust backend for channel in getinfo

[patchbot@xxxxxxx]

commit c9b8314ee99f30a62b7ff6db253598fa4e14ba54
Author:     Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
AuthorDate: Wed May 4 15:57:10 2016 +0100
Commit:     Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>
CommitDate: Mon Jun 6 15:48:35 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 9f77269..35cfffe 100644
--- a/tools/libxl/libxl.c
+++ b/tools/libxl/libxl.c
@@ -3977,12 +3977,8 @@ 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#stable-4.5

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