From 3d2a62653d12a7488fee5ee3402f4b491f6d2e3a Mon Sep 17 00:00:00 2001
From: Natanael Copa <ncopa@alpinelinux.org>
Date: Tue, 29 Aug 2023 14:53:36 +0200
Subject: [PATCH] start-stop-daemon, supervise-daemon: use close_range with
 musl

Make sure that we use close_range also with musl libc, using syscall
directly.
---
 meson.build                               |  7 +++---
 src/start-stop-daemon/start-stop-daemon.c | 26 +++++++++++++++++++++--
 src/supervise-daemon/supervise-daemon.c   | 23 ++++++++++++++++++--
 3 files changed, 49 insertions(+), 7 deletions(-)

diff --git a/meson.build b/meson.build
index 3e94ce5d6..60e403f5f 100644
--- a/meson.build
+++ b/meson.build
@@ -198,9 +198,10 @@ endif
 if cc.has_function('closefrom', prefix: '#define _GNU_SOURCE\n#include <unistd.h>')
   add_project_arguments('-DHAVE_CLOSEFROM', language: 'c')
 endif
-if cc.has_function('close_range', prefix: '#define _GNU_SOURCE\n#include <unistd.h>') and \
-    cc.has_header_symbol('unistd.h', 'CLOSE_RANGE_CLOEXEC', prefix: '#define _GNU_SOURCE')
-  add_project_arguments('-DHAVE_CLOSE_RANGE_CLOEXEC', language: 'c')
+if cc.has_function('close_range', prefix: '#define _GNU_SOURCE\n#include <unistd.h>')
+  add_project_arguments('-DHAVE_CLOSE_RANGE', language: 'c')
+elif cc.has_header('linux/close_range.h')
+  add_project_arguments('-DHAVE_LINUX_CLOSE_RANGE_H', language: 'c')
 endif
 
 incdir = include_directories('src/shared')
diff --git a/src/start-stop-daemon/start-stop-daemon.c b/src/start-stop-daemon/start-stop-daemon.c
index ef6f454eb..6dae67c59 100644
--- a/src/start-stop-daemon/start-stop-daemon.c
+++ b/src/start-stop-daemon/start-stop-daemon.c
@@ -48,6 +48,9 @@
 #ifdef __linux__
 # include <sys/syscall.h> /* For io priority */
 # include <sys/prctl.h> /* For prctl */
+# if !defined(HAVE_CLOSE_RANGE) && defined(HAVE_LINUX_CLOSE_RANGE_H)
+#  include <linux/close_range.h>
+# endif
 #endif
 #include <termios.h>
 #include <time.h>
@@ -191,6 +194,22 @@ static inline int ioprio_set(int which RC_UNUSED,
 }
 #endif
 
+#if !defined(SYS_close_range) && defined(__NR_close_range)
+# define SYS_close_range __NR_close_range
+#endif
+#ifndef HAVE_CLOSE_RANGE
+static inline int close_range(unsigned int first RC_UNUSED,
+			      unsigned int last RC_UNUSED,
+			      unsigned int flags RC_UNUSED)
+{
+#if defined(SYS_close_range)
+	return syscall(SYS_close_range, first, last, flags);
+#else
+	return -1;
+#endif
+}
+#endif
+
 static void
 cleanup(void)
 {
@@ -1101,8 +1120,11 @@ int main(int argc, char **argv)
 #ifdef HAVE_CLOSEFROM
 		closefrom(3);
 #else
-		for (i = getdtablesize() - 1; i >= 3; --i)
-			close(i);
+# ifdef CLOSE_RANGE_UNSHARE
+		if (close_range(3, 0, CLOSE_RANGE_UNSHARE) < 0)
+# endif
+			for (i = getdtablesize() - 1; i >= 3; --i)
+				close(i);
 #endif
 
 		if (scheduler != NULL) {
diff --git a/src/supervise-daemon/supervise-daemon.c b/src/supervise-daemon/supervise-daemon.c
index 836a1ec77..b36937931 100644
--- a/src/supervise-daemon/supervise-daemon.c
+++ b/src/supervise-daemon/supervise-daemon.c
@@ -22,7 +22,7 @@
 #define ONE_SECOND    1000000000
 #define ONE_MS           1000000
 
-#ifdef HAVE_CLOSE_RANGE_CLOEXEC
+#ifdef HAVE_CLOSE_RANGE
 /* For close_range() */
 # define _GNU_SOURCE
 #endif
@@ -43,6 +43,9 @@
 #ifdef __linux__
 # include <sys/syscall.h> /* For io priority */
 # include <sys/prctl.h> /* For prctl */
+# if !defined(HAVE_CLOSE_FROM) && defined(HAVE_LINUX_CLOSE_RANGE_H)
+#  include <linux/close_range.h>
+# endif
 #endif
 #include <syslog.h>
 #include <sys/ioctl.h>
@@ -203,6 +206,22 @@ static inline int ioprio_set(int which RC_UNUSED, int who RC_UNUSED,
 }
 #endif
 
+#if !defined(SYS_close_range) && defined(__NR_close_range)
+# define SYS_close_range __NR_close_range
+#endif
+#ifndef HAVE_CLOSE_RANGE
+static inline int close_range(unsigned int first RC_UNUSED,
+			      unsigned int last RC_UNUSED,
+			      unsigned int flags RC_UNUSED)
+{
+#ifdef SYS_close_range
+	return syscall(SYS_close_range, first, last, flags);
+#else
+	return -1;
+#endif
+}
+#endif
+
 static void cleanup(void)
 {
 	free(changeuser);
@@ -570,7 +589,7 @@ RC_NORETURN static void child_process(char *exec, char **argv)
 	if (redirect_stderr || rc_yesno(getenv("EINFO_QUIET")))
 		dup2(stderr_fd, STDERR_FILENO);
 
-#ifdef HAVE_CLOSE_RANGE_CLOEXEC
+#ifdef CLOSE_RANGE_CLOEXEC
 	if (close_range(3, UINT_MAX, CLOSE_RANGE_CLOEXEC) < 0)
 #endif
 		for (i = getdtablesize() - 1; i >= 3; --i)