From a48190c9f9b07f735d14743878955511e66206c4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= <zbyszek@in.waw.pl>
Date: Thu, 6 Nov 2014 16:44:06 -0500
Subject: [PATCH] Revert "missing: remove fanotify"
This reverts commit c7e4a7bece7a5c4484d229dd5e8ff01a5d49c62e.
---
Makefile.am | 1 +
configure.ac | 1 +
src/shared/linux/fanotify.h | 98 +++++++++++++++++++++++++++++++++++++++++++++
src/shared/missing.h | 59 +++++++++++++++++++++++++++
4 files changed, 159 insertions(+)
create mode 100644 src/shared/linux/fanotify.h
diff --git a/Makefile.am b/Makefile.am
index 11a3033253..6d869c12ad 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -741,6 +741,7 @@ noinst_LTLIBRARIES += \
libsystemd_shared_la_SOURCES = \
src/shared/linux/auto_dev-ioctl.h \
+ src/shared/linux/fanotify.h \
src/shared/ioprio.h \
src/shared/missing.h \
src/shared/initreq.h \
diff --git a/configure.ac b/configure.ac
index e63d3dc809..c2f8f7a548 100644
--- a/configure.ac
+++ b/configure.ac
@@ -306,6 +306,7 @@ RT_LIBS="$LIBS"
AC_SUBST(RT_LIBS)
LIBS="$save_LIBS"
+AC_CHECK_FUNCS([fanotify_init fanotify_mark])
AC_CHECK_FUNCS([memfd_create])
AC_CHECK_FUNCS([__secure_getenv secure_getenv])
AC_CHECK_DECLS([gettid, pivot_root, name_to_handle_at, setns, LO_FLAGS_PARTSCAN],
diff --git a/src/shared/linux/fanotify.h b/src/shared/linux/fanotify.h
new file mode 100644
index 0000000000..63531a6b4d
--- /dev/null
+++ b/src/shared/linux/fanotify.h
@@ -0,0 +1,98 @@
+#ifndef _LINUX_FANOTIFY_H
+#define _LINUX_FANOTIFY_H
+
+#include <linux/types.h>
+
+/* the following events that user-space can register for */
+#define FAN_ACCESS 0x00000001 /* File was accessed */
+#define FAN_MODIFY 0x00000002 /* File was modified */
+#define FAN_CLOSE_WRITE 0x00000008 /* Unwrittable file closed */
+#define FAN_CLOSE_NOWRITE 0x00000010 /* Writtable file closed */
+#define FAN_OPEN 0x00000020 /* File was opened */
+
+#define FAN_EVENT_ON_CHILD 0x08000000 /* interested in child events */
+
+/* FIXME currently Q's have no limit.... */
+#define FAN_Q_OVERFLOW 0x00004000 /* Event queued overflowed */
+
+#define FAN_OPEN_PERM 0x00010000 /* File open in perm check */
+#define FAN_ACCESS_PERM 0x00020000 /* File accessed in perm check */
+
+/* helper events */
+#define FAN_CLOSE (FAN_CLOSE_WRITE | FAN_CLOSE_NOWRITE) /* close */
+
+/* flags used for fanotify_init() */
+#define FAN_CLOEXEC 0x00000001
+#define FAN_NONBLOCK 0x00000002
+
+#define FAN_ALL_INIT_FLAGS (FAN_CLOEXEC | FAN_NONBLOCK)
+
+/* flags used for fanotify_modify_mark() */
+#define FAN_MARK_ADD 0x00000001
+#define FAN_MARK_REMOVE 0x00000002
+#define FAN_MARK_DONT_FOLLOW 0x00000004
+#define FAN_MARK_ONLYDIR 0x00000008
+#define FAN_MARK_MOUNT 0x00000010
+#define FAN_MARK_IGNORED_MASK 0x00000020
+#define FAN_MARK_IGNORED_SURV_MODIFY 0x00000040
+#define FAN_MARK_FLUSH 0x00000080
+
+#define FAN_ALL_MARK_FLAGS (FAN_MARK_ADD |\
+ FAN_MARK_REMOVE |\
+ FAN_MARK_DONT_FOLLOW |\
+ FAN_MARK_ONLYDIR |\
+ FAN_MARK_MOUNT |\
+ FAN_MARK_IGNORED_MASK |\
+ FAN_MARK_IGNORED_SURV_MODIFY)
+
+/*
+ * All of the events - we build the list by hand so that we can add flags in
+ * the future and not break backward compatibility. Apps will get only the
+ * events that they originally wanted. Be sure to add new events here!
+ */
+#define FAN_ALL_EVENTS (FAN_ACCESS |\
+ FAN_MODIFY |\
+ FAN_CLOSE |\
+ FAN_OPEN)
+
+/*
+ * All events which require a permission response from userspace
+ */
+#define FAN_ALL_PERM_EVENTS (FAN_OPEN_PERM |\
+ FAN_ACCESS_PERM)
+
+#define FAN_ALL_OUTGOING_EVENTS (FAN_ALL_EVENTS |\
+ FAN_ALL_PERM_EVENTS |\
+ FAN_Q_OVERFLOW)
+
+#define FANOTIFY_METADATA_VERSION 2
+
+struct fanotify_event_metadata {
+ __u32 event_len;
+ __u32 vers;
+ __u64 mask;
+ __s32 fd;
+ __s32 pid;
+} __attribute__ ((packed));
+
+struct fanotify_response {
+ __s32 fd;
+ __u32 response;
+} __attribute__ ((packed));
+
+/* Legit userspace responses to a _PERM event */
+#define FAN_ALLOW 0x01
+#define FAN_DENY 0x02
+
+/* Helper functions to deal with fanotify_event_metadata buffers */
+#define FAN_EVENT_METADATA_LEN (sizeof(struct fanotify_event_metadata))
+
+#define FAN_EVENT_NEXT(meta, len) ((len) -= (meta)->event_len, \
+ (struct fanotify_event_metadata*)(((char *)(meta)) + \
+ (meta)->event_len))
+
+#define FAN_EVENT_OK(meta, len) ((long)(len) >= (long)FAN_EVENT_METADATA_LEN && \
+ (long)(meta)->event_len >= (long)FAN_EVENT_METADATA_LEN && \
+ (long)(meta)->event_len <= (long)(len))
+
+#endif /* _LINUX_FANOTIFY_H */
diff --git a/src/shared/missing.h b/src/shared/missing.h
index bb4f8f23a8..c98d0273a3 100644
--- a/src/shared/missing.h
+++ b/src/shared/missing.h
@@ -116,6 +116,12 @@ static inline int pivot_root(const char *new_root, const char *put_old) {
#endif
#ifdef __x86_64__
+# ifndef __NR_fanotify_init
+# define __NR_fanotify_init 300
+# endif
+# ifndef __NR_fanotify_mark
+# define __NR_fanotify_mark 301
+# endif
# ifndef __NR_memfd_create
# define __NR_memfd_create 319
# endif
@@ -124,16 +130,69 @@ static inline int pivot_root(const char *new_root, const char *put_old) {
# define __NR_memfd_create 385
# endif
#elif defined _MIPS_SIM
+# if _MIPS_SIM == _MIPS_SIM_ABI32
+# ifndef __NR_fanotify_init
+# define __NR_fanotify_init 4336
+# endif
+# ifndef __NR_fanotify_mark
+# define __NR_fanotify_mark 4337
+# endif
+# elif _MIPS_SIM == _MIPS_SIM_NABI32
+# ifndef __NR_fanotify_init
+# define __NR_fanotify_init 6300
+# endif
+# ifndef __NR_fanotify_mark
+# define __NR_fanotify_mark 6301
+# endif
+# elif _MIPS_SIM == _MIPS_SIM_ABI64
+# ifndef __NR_fanotify_init
+# define __NR_fanotify_init 5295
+# endif
+# ifndef __NR_fanotify_mark
+# define __NR_fanotify_mark 5296
+# endif
+# endif
# ifndef __NR_memfd_create
# warning "__NR_memfd_create not yet defined for MIPS"
# define __NR_memfd_create 0xffffffff
# endif
#else
+# ifndef __NR_fanotify_init
+# define __NR_fanotify_init 338
+# endif
+# ifndef __NR_fanotify_mark
+# define __NR_fanotify_mark 339
+# endif
# ifndef __NR_memfd_create
# define __NR_memfd_create 356
# endif
#endif
+#ifndef HAVE_FANOTIFY_INIT
+static inline int fanotify_init(unsigned int flags, unsigned int event_f_flags) {
+ return syscall(__NR_fanotify_init, flags, event_f_flags);
+}
+#endif
+
+#ifndef HAVE_FANOTIFY_MARK
+static inline int fanotify_mark(int fanotify_fd, unsigned int flags, uint64_t mask,
+ int dfd, const char *pathname) {
+#if defined _MIPS_SIM && _MIPS_SIM == _MIPS_SIM_ABI32 || defined __powerpc__ && !defined __powerpc64__ \
+ || defined __arm__ && !defined __aarch64__
+ union {
+ uint64_t _64;
+ uint32_t _32[2];
+ } _mask;
+ _mask._64 = mask;
+
+ return syscall(__NR_fanotify_mark, fanotify_fd, flags,
+ _mask._32[0], _mask._32[1], dfd, pathname);
+#else
+ return syscall(__NR_fanotify_mark, fanotify_fd, flags, mask, dfd, pathname);
+#endif
+}
+#endif
+
#ifndef HAVE_MEMFD_CREATE
static inline int memfd_create(const char *name, unsigned int flags) {
return syscall(__NR_memfd_create, name, flags);