[Xen-devel] [PATCH] libxl: Fix format string abuses / vulnerabilities

[Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>]

There are a few places where libxl__xs_write is passed a variable
value to write to xenstore, but the semantics are that the first char*
is a format string.  So use "%s".

This fixes the following errors reported by some newer compilers:
 libxl.c: In function "libxl_create_cpupool":
 libxl.c:3981: error: format not a string literal and no format arguments
 libxl.c:3983: error: format not a string literal and no format arguments
 libxl.c: In function "libxl_cpupool_movedomain":
 libxl.c:4095: error: format not a string literal and no format arguments

Signed-off-by: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>

diff -r 28a160746815 tools/libxl/libxl.c
--- a/tools/libxl/libxl.c       Wed Oct 27 12:24:28 2010 +0100
+++ b/tools/libxl/libxl.c       Wed Oct 27 13:38:30 2010 +0100
@@ -3977,10 +3977,12 @@ int libxl_create_cpupool(libxl_ctx *ctx,
         t = xs_transaction_start(ctx->xsh);
 
         xs_mkdir(ctx->xsh, t, libxl__sprintf(&gc, "/local/pool/%d", *poolid));
-        libxl__xs_write(&gc, t, libxl__sprintf(&gc, "/local/pool/%d/uuid", 
*poolid),
-                 uuid_string);
-        libxl__xs_write(&gc, t, libxl__sprintf(&gc, "/local/pool/%d/name", 
*poolid),
-                 name);
+        libxl__xs_write(&gc, t,
+                        libxl__sprintf(&gc, "/local/pool/%d/uuid", *poolid),
+                        "%s", uuid_string);
+        libxl__xs_write(&gc, t,
+                        libxl__sprintf(&gc, "/local/pool/%d/name", *poolid),
+                        "%s", name);
 
         if (xs_transaction_end(ctx->xsh, t, 0) || (errno != EAGAIN))
             return 0;
@@ -4092,7 +4094,8 @@ int libxl_cpupool_movedomain(libxl_ctx *
         if (!vm_path)
             break;
 
-        libxl__xs_write(&gc, t, libxl__sprintf(&gc, "%s/pool_name", vm_path), 
poolname);
+        libxl__xs_write(&gc, t, libxl__sprintf(&gc, "%s/pool_name", vm_path),
+                        "%s", poolname);
 
         if (xs_transaction_end(ctx->xsh, t, 0) || (errno != EAGAIN))
             break;

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