- (dtucker) [configure.ac] Detect platforms that can't use select(2) with
setrlimit(RLIMIT_NOFILE, rl_zero) and disable the rlimit sandbox on those.
diff --git a/configure.ac b/configure.ac
index 02f8bf8..97cf7b1 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,4 +1,4 @@
-# $Id: configure.ac,v 1.492 2012/05/19 05:24:37 dtucker Exp $
+# $Id: configure.ac,v 1.493 2012/07/03 04:31:18 dtucker Exp $
#
# Copyright (c) 1999-2004 Damien Miller
#
@@ -15,7 +15,7 @@
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
AC_INIT([OpenSSH], [Portable], [openssh-unix-dev@mindrot.org])
-AC_REVISION($Revision: 1.492 $)
+AC_REVISION($Revision: 1.493 $)
AC_CONFIG_SRCDIR([ssh.c])
AC_LANG([C])
@@ -686,7 +686,8 @@
AC_DEFINE([SSH_TUN_PREPEND_AF], [1],
[Prepend the address family to IP tunnel traffic])
fi
- AC_CHECK_HEADERS([linux/seccomp.h linux/filter.h linux/audit.h])
+ AC_CHECK_HEADERS([linux/seccomp.h linux/filter.h linux/audit.h], [],
+ [], [#include <linux/types.h>])
AC_CHECK_FUNCS([prctl])
have_seccomp_audit_arch=1
case "$host" in
@@ -2575,6 +2576,45 @@
fi
]
)
+
+# Some platforms (seems to be the ones that have a kernel poll(2)-type
+# function with which they implement select(2)) use an extra file descriptor
+# when calling select(2), which means we can't use the rlimit sandbox.
+AC_MSG_CHECKING([if select works with descriptor rlimit])
+AC_RUN_IFELSE(
+ [AC_LANG_PROGRAM([[
+#include <sys/types.h>
+#ifdef HAVE_SYS_TIME_H
+# include <sys/time.h>
+#endif
+#include <sys/resource.h>
+#ifdef HAVE_SYS_SELECT_H
+# include <sys/select.h>
+#endif
+#include <errno.h>
+#include <fcntl.h>
+#include <stdlib.h>
+ ]],[[
+ struct rlimit rl_zero;
+ int fd, r;
+ fd_set fds;
+
+ fd = open("/dev/null", O_RDONLY);
+ FD_ZERO(&fds);
+ FD_SET(fd, &fds);
+ rl_zero.rlim_cur = rl_zero.rlim_max = 0;
+ setrlimit(RLIMIT_FSIZE, &rl_zero);
+ setrlimit(RLIMIT_NOFILE, &rl_zero);
+ r = select(fd+1, &fds, NULL, NULL, NULL);
+ exit (r == -1 ? 1 : 0);
+ ]])],
+ [AC_MSG_RESULT([yes])
+ select_works_with_rlimit=yes],
+ [AC_MSG_RESULT([no])
+ select_works_with_rlimit=no],
+ [AC_MSG_WARN([cross compiling: assuming yes])]
+)
+
if test "x$sandbox_arg" = "xsystrace" || \
( test -z "$sandbox_arg" && test "x$have_systr_policy_kill" = "x1" ) ; then
test "x$have_systr_policy_kill" != "x1" && \
@@ -2607,9 +2647,12 @@
SANDBOX_STYLE="seccomp_filter"
AC_DEFINE([SANDBOX_SECCOMP_FILTER], [1], [Sandbox using seccomp filter])
elif test "x$sandbox_arg" = "xrlimit" || \
- ( test -z "$sandbox_arg" && test "x$ac_cv_func_setrlimit" = "xyes" ) ; then
+ ( test -z "$sandbox_arg" && test "x$ac_cv_func_setrlimit" = "xyes" && \
+ test "x$select_works_with_rlimit" == "xyes" ) ; then
test "x$ac_cv_func_setrlimit" != "xyes" && \
AC_MSG_ERROR([rlimit sandbox requires setrlimit function])
+ test "x$select_works_with_rlimit" != "xyes" && \
+ AC_MSG_ERROR([rlimit sandbox requires select to work with rlimit])
SANDBOX_STYLE="rlimit"
AC_DEFINE([SANDBOX_RLIMIT], [1], [Sandbox using setrlimit(2)])
elif test -z "$sandbox_arg" || test "x$sandbox_arg" = "xno" || \