[Bug 109] Using the environment variable to get the filepath

[Bug 109] Using the environment variable to get the filepath

[bugzilla]

https://bugs.dpdk.org/show_bug.cgi?id=109

            Bug ID: 109
           Summary: Using the environment variable to get the filepath
           Product: DPDK
           Version: 17.11
          Hardware: All
                OS: All
            Status: IN_PROGRESS
          Severity: minor
          Priority: Normal
         Component: ethdev
          Assignee: dev@dpdk.org
          Reporter: andy01011501@163.com
  Target Milestone: 17.11

In some functions like
  eal_runtime_config_path,
  eal_hugepage_info_path,
  rte_pci_get_sysfs_path,

DPDK use the environment variable to get the file path like the code below:
    const char *rte_pci_get_sysfs_path(void)
    {
        const char *path = NULL;

        path = getenv("SYSFS_PCI_DEVICES");
        if (path == NULL)
                return SYSFS_PCI_DEVICES;

        return path;
    }

There are some risks when the envs are changed to some path like
"../../../etc/passwd" and the attackers have chances to construct file paths
for unauthorized access.

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