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-rw-r--r--configure.ac3
-rw-r--r--src/shared/missing.h11
-rw-r--r--src/shared/selinux-util.c1
3 files changed, 14 insertions, 1 deletions
diff --git a/configure.ac b/configure.ac
index 01b8ca006b..ccb1012d57 100644
--- a/configure.ac
+++ b/configure.ac
@@ -66,8 +66,9 @@ AC_C_INLINE
AC_TYPE_MODE_T
AC_TYPE_PID_T
AC_CHECK_MEMBERS([struct stat.st_rdev])
-AC_CHECK_DECLS([getrandom, gettid, name_to_handle_at, accept4, mkostemp], [], [], [[#include <sys/types.h>
+AC_CHECK_DECLS([getrandom, gettid, name_to_handle_at, accept4, mkostemp, strndupa], [], [], [[#include <sys/types.h>
#include <unistd.h>
+#include <string.h>
#include <sys/mount.h>
#include <fcntl.h>
#include <sys/socket.h>
diff --git a/src/shared/missing.h b/src/shared/missing.h
index 2dc9d842d3..9031119a45 100644
--- a/src/shared/missing.h
+++ b/src/shared/missing.h
@@ -158,3 +158,14 @@ static inline int name_to_handle_at(int fd, const char *name, struct file_handle
#ifndef AT_EMPTY_PATH
#define AT_EMPTY_PATH 0x1000
#endif
+
+#if !HAVE_DECL_STRNDUPA
+#define strndupa(s, n) \
+ ({ \
+ const char *__old = (s); \
+ size_t __len = strnlen(__old, (n)); \
+ char *__new = (char *)alloca(__len + 1); \
+ __new[__len] = '\0'; \
+ (char *)memcpy(__new, __old, __len); \
+ })
+#endif
diff --git a/src/shared/selinux-util.c b/src/shared/selinux-util.c
index 4e0866be5f..a18a5a7230 100644
--- a/src/shared/selinux-util.c
+++ b/src/shared/selinux-util.c
@@ -31,6 +31,7 @@
#include "strv.h"
#include "path-util.h"
#include "selinux-util.h"
+#include "missing.h"
#ifdef HAVE_SELINUX
DEFINE_TRIVIAL_CLEANUP_FUNC(security_context_t, freecon);