From 5d66d4942090a971de8df2c3de9ce143a208eb37 Mon Sep 17 00:00:00 2001
From: Michal Schmidt <mschmidt@redhat.com>
Date: Thu, 19 Feb 2015 23:12:38 +0100
Subject: [PATCH] core, shared: in deserializing, match same files reached via
 different paths

When dbus.socket is updated like this:
-ListenStream=/var/run/dbus/system_bus_socket
+ListenStream=/run/dbus/system_bus_socket
... and daemon-reload is performed, bad things happen.
During deserialization systemd does not recognize that the two paths
refer to the same named socket and replaces the socket file with a new
one. As a result, applications hang when they try talking to dbus.

Fix this by finding a match not only when the path names are equal, but
also when they point to the same inode.
In socket_address_equal() it is necessary to move the address size
comparison into the abstract sockets branch. For path name sockets the
comparison must not be done and for other families it is redundant
(their sizes are constant and checked by socket_address_verify()).

FIFOs and special files can also have multiple pathnames, so compare the
inodes for them as well. Note that previously the pathname checks used
streq_ptr(), but the paths cannot be NULL.

Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1186018
(cherry picked from commit c78e47a61fa8d9a21fece01c83e4c26ce0938d27)
---
 src/core/socket.c        |  6 +++---
 src/shared/path-util.c   |  4 ++++
 src/shared/path-util.h   |  1 +
 src/shared/socket-util.c | 10 ++++------
 4 files changed, 12 insertions(+), 9 deletions(-)

diff --git a/src/core/socket.c b/src/core/socket.c
index 48c43a2..88aae48 100644
--- a/src/core/socket.c
+++ b/src/core/socket.c
@@ -2100,7 +2100,7 @@ static int socket_deserialize_item(Unit *u, const char *key, const char *value,
 
                         LIST_FOREACH(port, p, s->ports)
                                 if (p->type == SOCKET_FIFO &&
-                                    streq_ptr(p->path, value+skip))
+                                    path_equal_or_files_same(p->path, value+skip))
                                         break;
 
                         if (p) {
@@ -2119,7 +2119,7 @@ static int socket_deserialize_item(Unit *u, const char *key, const char *value,
 
                         LIST_FOREACH(port, p, s->ports)
                                 if (p->type == SOCKET_SPECIAL &&
-                                    streq_ptr(p->path, value+skip))
+                                    path_equal_or_files_same(p->path, value+skip))
                                         break;
 
                         if (p) {
@@ -2138,7 +2138,7 @@ static int socket_deserialize_item(Unit *u, const char *key, const char *value,
 
                         LIST_FOREACH(port, p, s->ports)
                                 if (p->type == SOCKET_MQUEUE &&
-                                    streq_ptr(p->path, value+skip))
+                                    streq(p->path, value+skip))
                                         break;
 
                         if (p) {
diff --git a/src/shared/path-util.c b/src/shared/path-util.c
index b9db7f1..70bc1ca 100644
--- a/src/shared/path-util.c
+++ b/src/shared/path-util.c
@@ -436,6 +436,10 @@ bool path_equal(const char *a, const char *b) {
         }
 }
 
+bool path_equal_or_files_same(const char *a, const char *b) {
+        return path_equal(a, b) || files_same(a, b) > 0;
+}
+
 char* path_join(const char *root, const char *path, const char *rest) {
         assert(path);
 
diff --git a/src/shared/path-util.h b/src/shared/path-util.h
index bd0d324..bcf116e 100644
--- a/src/shared/path-util.h
+++ b/src/shared/path-util.h
@@ -45,6 +45,7 @@ int path_make_relative(const char *from_dir, const char *to_path, char **_r);
 char* path_kill_slashes(char *path);
 char* path_startswith(const char *path, const char *prefix) _pure_;
 bool path_equal(const char *a, const char *b) _pure_;
+bool path_equal_or_files_same(const char *a, const char *b);
 char* path_join(const char *root, const char *path, const char *rest);
 
 char** path_strv_make_absolute_cwd(char **l);
diff --git a/src/shared/socket-util.c b/src/shared/socket-util.c
index c6f6487..c278d6f 100644
--- a/src/shared/socket-util.c
+++ b/src/shared/socket-util.c
@@ -325,9 +325,6 @@ bool socket_address_equal(const SocketAddress *a, const SocketAddress *b) {
         if (a->type != b->type)
                 return false;
 
-        if (a->size != b->size)
-                return false;
-
         if (socket_address_family(a) != socket_address_family(b))
                 return false;
 
@@ -352,14 +349,16 @@ bool socket_address_equal(const SocketAddress *a, const SocketAddress *b) {
                 break;
 
         case AF_UNIX:
-
                 if ((a->sockaddr.un.sun_path[0] == 0) != (b->sockaddr.un.sun_path[0] == 0))
                         return false;
 
                 if (a->sockaddr.un.sun_path[0]) {
-                        if (!strneq(a->sockaddr.un.sun_path, b->sockaddr.un.sun_path, sizeof(a->sockaddr.un.sun_path)))
+                        if (!path_equal_or_files_same(a->sockaddr.un.sun_path, b->sockaddr.un.sun_path))
                                 return false;
                 } else {
+                        if (a->size != b->size)
+                                return false;
+
                         if (memcmp(a->sockaddr.un.sun_path, b->sockaddr.un.sun_path, a->size) != 0)
                                 return false;
                 }
@@ -367,7 +366,6 @@ bool socket_address_equal(const SocketAddress *a, const SocketAddress *b) {
                 break;
 
         case AF_NETLINK:
-
                 if (a->protocol != b->protocol)
                         return false;