File xen.f49fa658b53580cf2ad354d2bf1796766cc11222.patch of Package xen

Overview Repositories Revisions Requests Users Attributes Meta

File xen.f49fa658b53580cf2ad354d2bf1796766cc11222.patch of Package xen

From: Seraphime Kirkovski <kirkseraph@gmail.com>
Date: Tue, 4 Apr 2017 19:31:59 +0200
Subject: f49fa658b53580cf2ad354d2bf1796766cc11222
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

tools:misc:xenlockprof: fix possible format string overflow

GCC7 complains about a possible overflow/truncation in xenlockprof.

xenlockprof.c: In function ‘main’:
xenlockprof.c:100:53: error: ‘%s’ directive writing up to 39 bytes into a
                         region of size between 17 and 37 [-Werror=format-overflow=]
             sprintf(name, "unknown type(%d) %d lock %s", data[j].type,
                                                     ^~
xenlockprof.c:100:13: note: ‘sprintf’ output between 24 and 83 bytes
                                             into a destination of size 60
             sprintf(name, "unknown type(%d) %d lock %s", data[j].type,
             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                     data[j].idx, data[j].name);
                     ~~~~~~~~~~~~~~~~~~~~~~~~~~

This increases the size of name to 100. Not the most scalable solution,
but certainly the "cheapest", as it doesn't add dependencies for
asprintf.

Signed-off-by: Seraphime Kirkovski <kirkseraph@gmail.com>
Acked-by: Wei Liu <wei.liu2@citrix.com>
---
 tools/misc/xenlockprof.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/tools/misc/xenlockprof.c
+++ b/tools/misc/xenlockprof.c
@@ -15,25 +15,25 @@
 #include <stdlib.h>
 #include <sys/mman.h>
 #include <errno.h>
 #include <string.h>
 #include <inttypes.h>
 
 int main(int argc, char *argv[])
 {
     xc_interface      *xc_handle;
     uint32_t           i, j, n;
     uint64_t           time;
     double             l, b, sl, sb;
-    char               name[60];
+    char               name[100];
     DECLARE_HYPERCALL_BUFFER(xc_lockprof_data_t, data);
 
     if ( (argc > 2) || ((argc == 2) && (strcmp(argv[1], "-r") != 0)) )
     {
         printf("%s: [-r]\n", argv[0]);
         printf("no args: print lock profile data\n");
         printf("    -r : reset profile data\n");
         return 1;
     }
 
     if ( (xc_handle = xc_interface_open(0,0,0)) == 0 )
     {

Places

File xen.f49fa658b53580cf2ad354d2bf1796766cc11222.patch of Package xen

Places