diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 6495ddc4cd..674f70e70a 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -7295,34 +7295,29 @@ static int open_self_stat(void *cpu_env, int fd)
 {
     CPUState *cpu = env_cpu((CPUArchState *)cpu_env);
     TaskState *ts = cpu->opaque;
-    abi_ulong start_stack = ts->info->start_stack;
+    g_autoptr(GString) buf = g_string_new(NULL);
     int i;
 
     for (i = 0; i < 44; i++) {
-      char buf[128];
-      int len;
-      uint64_t val = 0;
+        if (i == 0) {
+            /* pid */
+            g_string_printf(buf, FMT_pid " ", getpid());
+        } else if (i == 1) {
+            /* app name */
+            gchar *bin = g_strrstr(ts->bprm->argv[0], "/");
+            bin = bin ? bin + 1 : ts->bprm->argv[0];
+            g_string_printf(buf, "(%.15s) ", bin);
+        } else if (i == 27) {
+            /* stack bottom */
+            g_string_printf(buf, TARGET_ABI_FMT_ld " ", ts->info->start_stack);
+        } else {
+            /* for the rest, there is MasterCard */
+            g_string_printf(buf, "0%c", i == 43 ? '\n' : ' ');
+        }
 
-      if (i == 0) {
-        /* pid */
-        val = getpid();
-        snprintf(buf, sizeof(buf), "%"PRId64 " ", val);
-      } else if (i == 1) {
-        /* app name */
-        snprintf(buf, sizeof(buf), "(%s) ", ts->bprm->argv[0]);
-      } else if (i == 27) {
-        /* stack bottom */
-        val = start_stack;
-        snprintf(buf, sizeof(buf), "%"PRId64 " ", val);
-      } else {
-        /* for the rest, there is MasterCard */
-        snprintf(buf, sizeof(buf), "0%c", i == 43 ? '\n' : ' ');
-      }
-
-      len = strlen(buf);
-      if (write(fd, buf, len) != len) {
-          return -1;
-      }
+        if (write(fd, buf->str, buf->len) != buf->len) {
+            return -1;
+        }
     }
 
     return 0;