From 66d06bd0a577ddb2461e8d1e5c8c2fbf6845227d Mon Sep 17 00:00:00 2001

From: Lukas Nykryn <lnykryn@redhat.com>

Date: Wed, 19 Nov 2014 12:14:13 +0100

Subject: [PATCH] Revert "missing: remove fanotify"

This reverts commit c7e4a7bece7a5c4484d229dd5e8ff01a5d49c62e.

Conflicts:

	src/shared/missing.h

---

 Makefile.am                 |  1 +

 configure.ac                |  1 +

 src/shared/linux/fanotify.h | 98 +++++++++++++++++++++++++++++++++++++

 src/shared/missing.h        | 64 ++++++++++++++++++++++++

 4 files changed, 164 insertions(+)

 create mode 100644 src/shared/linux/fanotify.h

diff --git a/Makefile.am b/Makefile.am

index a734e9c486..70e4fbc6d4 100644

--- a/Makefile.am

+++ b/Makefile.am

@@ -749,6 +749,7 @@ libsystemd_shared_la_SOURCES = \

 	src/shared/capability.c \

 	src/shared/capability.h \

 	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 97a29d63fd..3f50887a8d 100644

--- a/configure.ac

+++ b/configure.ac

@@ -310,6 +310,7 @@ 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, getrandom, renameat2, kcmp, LO_FLAGS_PARTSCAN],

diff --git a/src/shared/linux/fanotify.h b/src/shared/linux/fanotify.h

new file mode 100644

index 0000000000..5cc1a7e676

--- /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 b33a70cb2c..06a55769a4 100644

--- a/src/shared/missing.h

+++ b/src/shared/missing.h

@@ -156,6 +156,70 @@ static inline int pivot_root(const char *new_root, const char *put_old) {

 #  endif

 #endif

+#ifdef __x86_64__

+#  ifndef __NR_fanotify_init

+#    define __NR_fanotify_init 300

+#  endif

+#  ifndef __NR_fanotify_mark

+#    define __NR_fanotify_mark 301

+#  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

+#else

+#  ifndef __NR_fanotify_init

+#    define __NR_fanotify_init 338

+#  endif

+#  ifndef __NR_fanotify_mark

+#    define __NR_fanotify_mark 339

+#  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);