make sessionid permissions in /proc/*/task/* match those in /proc/*

Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

fs/proc/base.c

@@ -3161,7 +3161,7 @@ static const struct pid_entry tid_base_stuff[] = {
 	REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations),
 #ifdef CONFIG_AUDITSYSCALL
 	REG("loginuid",  S_IWUSR|S_IRUGO, proc_loginuid_operations),
-	REG("sessionid",  S_IRUSR, proc_sessionid_operations),
+	REG("sessionid",  S_IRUGO, proc_sessionid_operations),
 #endif
 #ifdef CONFIG_FAULT_INJECTION
 	REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations),