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From 5c63b463b87d3c06102a4a7f05f395929d9ea79b Mon Sep 17 00:00:00 2001
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From: DJ Delorie <dj@delorie.com>
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Date: Wed, 2 Dec 2020 16:14:27 -0500
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Subject: Use memfd_create() (#604)
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memfd_create creates a file in a memory-only filesystem that may
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bypass strict security protocols in filesystem-based temporary
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files.
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diff -rup a/configure.ac b/configure.ac
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--- a/configure.ac 2014-05-11 09:57:49.000000000 -0400
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+++ b/configure.ac 2021-11-03 17:41:31.935391831 -0400
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@@ -63,6 +63,9 @@ EOF
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AM_MAINTAINER_MODE
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+AC_CHECK_HEADERS(sys/memfd.h)
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+AC_CHECK_FUNCS([memfd_create])
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+
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AC_CHECK_HEADERS(sys/mman.h)
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AC_CHECK_FUNCS(mmap)
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AC_FUNC_MMAP_BLACKLIST
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diff -rup a/configure b/configure
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--- a/configure 2014-05-19 09:44:03.000000000 -0400
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+++ b/configure 2021-11-18 17:29:45.484951520 -0500
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@@ -16976,6 +16976,30 @@ fi
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+for ac_header in sys/memfd.h
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+do :
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+ ac_fn_c_check_header_mongrel "$LINENO" "sys/memfd.h" "ac_cv_header_sys_memfd_h" "$ac_includes_default"
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+if test "x$ac_cv_header_sys_memfd_h" = xyes; then :
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+ cat >>confdefs.h <<_ACEOF
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+#define HAVE_SYS_MEMFD_H 1
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+_ACEOF
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+
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+fi
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+
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+done
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+
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+for ac_func in memfd_create
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+do :
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+ ac_fn_c_check_func "$LINENO" "memfd_create" "ac_cv_func_memfd_create"
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+if test "x$ac_cv_func_memfd_create" = xyes; then :
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+ cat >>confdefs.h <<_ACEOF
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+#define HAVE_MEMFD_CREATE 1
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+_ACEOF
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+
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+fi
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+done
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+
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+
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for ac_header in sys/mman.h
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do :
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ac_fn_c_check_header_mongrel "$LINENO" "sys/mman.h" "ac_cv_header_sys_mman_h" "$ac_includes_default"
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diff -rup a/fficonfig.h.in b/fficonfig.h.in
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--- a/fficonfig.h.in 2014-05-19 09:44:04.000000000 -0400
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+++ b/fficonfig.h.in 2021-11-18 17:45:39.000000000 -0500
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@@ -79,6 +79,9 @@
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/* Define to 1 if you have the `memcpy' function. */
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#undef HAVE_MEMCPY
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+/* Define to 1 if you have the `memfd_create' function. */
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+#undef HAVE_MEMFD_CREATE
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+
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/* Define to 1 if you have the <memory.h> header file. */
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#undef HAVE_MEMORY_H
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@@ -109,6 +112,9 @@
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/* Define to 1 if you have the <string.h> header file. */
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#undef HAVE_STRING_H
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+/* Define to 1 if you have the <sys/memfd.h> header file. */
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+#undef HAVE_SYS_MEMFD_H
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+
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/* Define to 1 if you have the <sys/mman.h> header file. */
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#undef HAVE_SYS_MMAN_H
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diff -rup a/src/closures.c b/src/closures.c
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--- a/src/closures.c 2021-11-03 17:37:37.841416436 -0400
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+++ b/src/closures.c 2021-11-03 17:43:19.027498783 -0400
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@@ -117,6 +117,9 @@
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#endif /* HAVE_MNTENT */
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#include <sys/param.h>
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#include <pthread.h>
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+#ifdef HAVE_SYS_MEMFD_H
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+#include <sys/memfd.h>
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+#endif
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/* We don't want sys/mman.h to be included after we redefine mmap and
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dlmunmap. */
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@@ -263,6 +266,17 @@ static int execfd = -1;
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/* The amount of space already allocated from the temporary file. */
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static size_t execsize = 0;
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+#ifdef HAVE_MEMFD_CREATE
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+/* Open a temporary file name, and immediately unlink it. */
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+static int
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+open_temp_exec_file_memfd (const char *name)
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+{
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+ int fd;
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+ fd = memfd_create (name, MFD_CLOEXEC);
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+ return fd;
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+}
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+#endif
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+
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/* Open a temporary file name, and immediately unlink it. */
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static int
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open_temp_exec_file_name (char *name, int flags)
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@@ -382,6 +396,9 @@ static struct
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const char *arg;
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int repeat;
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} open_temp_exec_file_opts[] = {
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+#ifdef HAVE_MEMFD_CREATE
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+ { open_temp_exec_file_memfd, "libffi", 0 },
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+#endif
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{ open_temp_exec_file_env, "LIBFFI_TMPDIR", 0 },
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{ open_temp_exec_file_env, "TMPDIR", 0 },
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{ open_temp_exec_file_dir, "/tmp", 0 },
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