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From 66d06bd0a577ddb2461e8d1e5c8c2fbf6845227d Mon Sep 17 00:00:00 2001
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From: Lukas Nykryn <lnykryn@redhat.com>
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Date: Wed, 19 Nov 2014 12:14:13 +0100
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Subject: [PATCH] Revert "missing: remove fanotify"
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This reverts commit c7e4a7bece7a5c4484d229dd5e8ff01a5d49c62e.
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Conflicts:
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	src/shared/missing.h
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---
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 Makefile.am                 |  1 +
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 configure.ac                |  1 +
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 src/shared/linux/fanotify.h | 98 +++++++++++++++++++++++++++++++++++++
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 src/shared/missing.h        | 64 ++++++++++++++++++++++++
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 4 files changed, 164 insertions(+)
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 create mode 100644 src/shared/linux/fanotify.h
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diff --git a/Makefile.am b/Makefile.am
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index a734e9c48..70e4fbc6d 100644
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--- a/Makefile.am
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+++ b/Makefile.am
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@@ -749,6 +749,7 @@ libsystemd_shared_la_SOURCES = \
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 	src/shared/capability.c \
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 	src/shared/capability.h \
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 	src/shared/linux/auto_dev-ioctl.h \
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+	src/shared/linux/fanotify.h \
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 	src/shared/ioprio.h \
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 	src/shared/missing.h \
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 	src/shared/initreq.h \
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diff --git a/configure.ac b/configure.ac
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index 97a29d63f..3f50887a8 100644
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--- a/configure.ac
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+++ b/configure.ac
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@@ -310,6 +310,7 @@ RT_LIBS="$LIBS"
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 AC_SUBST(RT_LIBS)
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 LIBS="$save_LIBS"
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+AC_CHECK_FUNCS([fanotify_init fanotify_mark])
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 AC_CHECK_FUNCS([memfd_create])
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 AC_CHECK_FUNCS([__secure_getenv secure_getenv])
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 AC_CHECK_DECLS([gettid, pivot_root, name_to_handle_at, setns, getrandom, renameat2, kcmp, LO_FLAGS_PARTSCAN],
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diff --git a/src/shared/linux/fanotify.h b/src/shared/linux/fanotify.h
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new file mode 100644
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index 000000000..5cc1a7e67
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--- /dev/null
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+++ b/src/shared/linux/fanotify.h
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@@ -0,0 +1,98 @@
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+#ifndef _LINUX_FANOTIFY_H
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+#define _LINUX_FANOTIFY_H
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+
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+#include <linux/types.h>
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+
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+/* the following events that user-space can register for */
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+#define FAN_ACCESS      0x00000001  /* File was accessed */
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+#define FAN_MODIFY      0x00000002  /* File was modified */
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+#define FAN_CLOSE_WRITE     0x00000008  /* Unwrittable file closed */
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+#define FAN_CLOSE_NOWRITE   0x00000010  /* Writtable file closed */
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+#define FAN_OPEN        0x00000020  /* File was opened */
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+
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+#define FAN_EVENT_ON_CHILD  0x08000000  /* interested in child events */
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+
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+/* FIXME currently Q's have no limit.... */
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+#define FAN_Q_OVERFLOW      0x00004000  /* Event queued overflowed */
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+
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+#define FAN_OPEN_PERM       0x00010000  /* File open in perm check */
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+#define FAN_ACCESS_PERM     0x00020000  /* File accessed in perm check */
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+
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+/* helper events */
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+#define FAN_CLOSE       (FAN_CLOSE_WRITE | FAN_CLOSE_NOWRITE) /* close */
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+
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+/* flags used for fanotify_init() */
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+#define FAN_CLOEXEC     0x00000001
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+#define FAN_NONBLOCK        0x00000002
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+
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+#define FAN_ALL_INIT_FLAGS  (FAN_CLOEXEC | FAN_NONBLOCK)
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+
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+/* flags used for fanotify_modify_mark() */
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+#define FAN_MARK_ADD        0x00000001
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+#define FAN_MARK_REMOVE     0x00000002
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+#define FAN_MARK_DONT_FOLLOW    0x00000004
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+#define FAN_MARK_ONLYDIR    0x00000008
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+#define FAN_MARK_MOUNT      0x00000010
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+#define FAN_MARK_IGNORED_MASK   0x00000020
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+#define FAN_MARK_IGNORED_SURV_MODIFY    0x00000040
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+#define FAN_MARK_FLUSH      0x00000080
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+
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+#define FAN_ALL_MARK_FLAGS  (FAN_MARK_ADD |\
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+                 FAN_MARK_REMOVE |\
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+                 FAN_MARK_DONT_FOLLOW |\
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+                 FAN_MARK_ONLYDIR |\
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+                 FAN_MARK_MOUNT |\
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+                 FAN_MARK_IGNORED_MASK |\
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+                 FAN_MARK_IGNORED_SURV_MODIFY)
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+
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+/*
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+ * All of the events - we build the list by hand so that we can add flags in
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+ * the future and not break backward compatibility.  Apps will get only the
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+ * events that they originally wanted.  Be sure to add new events here!
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+ */
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+#define FAN_ALL_EVENTS (FAN_ACCESS |\
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+            FAN_MODIFY |\
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+            FAN_CLOSE |\
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+            FAN_OPEN)
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+
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+/*
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+ * All events which require a permission response from userspace
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+ */
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+#define FAN_ALL_PERM_EVENTS (FAN_OPEN_PERM |\
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+                 FAN_ACCESS_PERM)
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+
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+#define FAN_ALL_OUTGOING_EVENTS (FAN_ALL_EVENTS |\
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+                 FAN_ALL_PERM_EVENTS |\
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+                 FAN_Q_OVERFLOW)
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+
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+#define FANOTIFY_METADATA_VERSION   2
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+
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+struct fanotify_event_metadata {
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+    __u32 event_len;
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+    __u32 vers;
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+    __u64 mask;
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+    __s32 fd;
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+    __s32 pid;
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+} __attribute__ ((packed));
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+
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+struct fanotify_response {
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+    __s32 fd;
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+    __u32 response;
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+} __attribute__ ((packed));
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+
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+/* Legit userspace responses to a _PERM event */
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+#define FAN_ALLOW   0x01
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+#define FAN_DENY    0x02
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+
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+/* Helper functions to deal with fanotify_event_metadata buffers */
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+#define FAN_EVENT_METADATA_LEN (sizeof(struct fanotify_event_metadata))
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+
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+#define FAN_EVENT_NEXT(meta, len) ((len) -= (meta)->event_len, \
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+                   (struct fanotify_event_metadata*)(((char *)(meta)) + \
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+                   (meta)->event_len))
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+
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+#define FAN_EVENT_OK(meta, len) ((long)(len) >= (long)FAN_EVENT_METADATA_LEN && \
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+                (long)(meta)->event_len >= (long)FAN_EVENT_METADATA_LEN && \
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+                (long)(meta)->event_len <= (long)(len))
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+
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+#endif /* _LINUX_FANOTIFY_H */
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diff --git a/src/shared/missing.h b/src/shared/missing.h
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index b33a70cb2..06a55769a 100644
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--- a/src/shared/missing.h
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+++ b/src/shared/missing.h
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@@ -156,6 +156,70 @@ static inline int pivot_root(const char *new_root, const char *put_old) {
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 #  endif
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 #endif
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+#ifdef __x86_64__
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+#  ifndef __NR_fanotify_init
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+#    define __NR_fanotify_init 300
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+#  endif
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+#  ifndef __NR_fanotify_mark
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+#    define __NR_fanotify_mark 301
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+#  endif
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+#elif defined _MIPS_SIM
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+#  if _MIPS_SIM == _MIPS_SIM_ABI32
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+#    ifndef __NR_fanotify_init
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+#      define __NR_fanotify_init 4336
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+#    endif
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+#    ifndef __NR_fanotify_mark
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+#      define __NR_fanotify_mark 4337
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+#    endif
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+#  elif _MIPS_SIM == _MIPS_SIM_NABI32
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+#    ifndef __NR_fanotify_init
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+#      define __NR_fanotify_init 6300
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+#    endif
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+#    ifndef __NR_fanotify_mark
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+#      define __NR_fanotify_mark 6301
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+#    endif
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+#  elif _MIPS_SIM == _MIPS_SIM_ABI64
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+#    ifndef __NR_fanotify_init
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+#      define __NR_fanotify_init 5295
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+#    endif
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+#    ifndef __NR_fanotify_mark
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+#      define __NR_fanotify_mark 5296
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+#    endif
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+#  endif
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+#else
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+#  ifndef __NR_fanotify_init
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+#    define __NR_fanotify_init 338
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+#  endif
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+#  ifndef __NR_fanotify_mark
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+#    define __NR_fanotify_mark 339
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+#  endif
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+#endif
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+
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+#ifndef HAVE_FANOTIFY_INIT
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+static inline int fanotify_init(unsigned int flags, unsigned int event_f_flags) {
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+        return syscall(__NR_fanotify_init, flags, event_f_flags);
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+}
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+#endif
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+
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+#ifndef HAVE_FANOTIFY_MARK
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+static inline int fanotify_mark(int fanotify_fd, unsigned int flags, uint64_t mask,
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+                                int dfd, const char *pathname) {
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+#if defined _MIPS_SIM && _MIPS_SIM == _MIPS_SIM_ABI32 || defined __powerpc__ && !defined __powerpc64__ \
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+    || defined __arm__ && !defined __aarch64__
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+        union {
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+                uint64_t _64;
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+                uint32_t _32[2];
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+        } _mask;
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+        _mask._64 = mask;
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+
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+        return syscall(__NR_fanotify_mark, fanotify_fd, flags,
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+                       _mask._32[0], _mask._32[1], dfd, pathname);
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+#else
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+        return syscall(__NR_fanotify_mark, fanotify_fd, flags, mask, dfd, pathname);
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+#endif
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+}
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+#endif
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+
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 #ifndef HAVE_MEMFD_CREATE
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 static inline int memfd_create(const char *name, unsigned int flags) {
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         return syscall(__NR_memfd_create, name, flags);