private-lib bug: 32 bit libraries being copied instead of 64 bit versions; splitting common code for firejail and fldd in a common static library

1 files changed, 62 insertions, 0 deletions

diff --git a/src/lib/ldd_utils.c b/src/lib/ldd_utils.c
new file mode 100644
index 000000000..556fb02eb
--- /dev/null
+++ b/src/lib/ldd_utils.c
@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2014-2018 Firejail Authors
+ *
+ * This file is part of firejail project
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#include "../include/ldd_utils.h"
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+const char * const default_lib_paths[] = {
+        "/lib",
+        "/lib/x86_64-linux-gnu",
+        "/lib64",
+        "/usr/lib",
+        "/usr/lib/x86_64-linux-gnu",
+        LIBDIR,
+        "/usr/local/lib",
+        "/usr/lib/x86_64-linux-gnu/mesa", // libGL.so is sometimes a symlink into this directory
+        "/usr/lib/x86_64-linux-gnu/mesa-egl", // libGL.so is sometimes a symlink into this directory
+//    "/usr/lib/x86_64-linux-gnu/plasma-discover",
+        NULL
+};
+
+// return 1 if this is a 64 bit program/library
+int is_lib_64(const char *exe) {
+        int retval = 0;
+        int fd = open(exe, O_RDONLY);
+        if (fd < 0)
+                return 0;
+        
+        unsigned char buf[EI_NIDENT];
+        ssize_t len = 0;
+        while (len < EI_NIDENT) {
+                ssize_t sz = read(fd, buf, EI_NIDENT);
+                if (sz <= 0)
+                        goto doexit;
+                len += sz;
+        }
+
+        if (buf[EI_CLASS] == ELFCLASS64)
+                retval = 1;
+
+doexit:
+        close(fd);
+        return retval;
+}