Merge pull request #3124 from poettering/small-journal-fixes

3 files changed, 40 insertions, 14 deletions

diff --git a/man/systemd.exec.xml b/man/systemd.exec.xml
index 4ed62dbada..fea42ebd31 100644
--- a/man/systemd.exec.xml
+++ b/man/systemd.exec.xml
@@ -94,11 +94,10 @@
     required to access <filename>/tmp</filename> and
     <filename>/var/tmp</filename>.</para>
 
-    <para>Units whose output standard output or error output is
-    connected to any other sink but <option>null</option>,
-    <option>tty</option> and <option>socket</option> automatically
-    acquire dependencies of type <varname>After=</varname> on
-    <filename>journald.socket</filename>.</para>
+    <para>Units whose output standard output or error output is connected to <option>journal</option>,
+    <option>syslog</option> or <option>kmsg</option> (or their combinations with console output, see below)
+    automatically acquire dependencies of type <varname>After=</varname> on
+    <filename>systemd-journald.socket</filename>.</para>
   </refsect1>
 
   <refsect1>
@@ -470,6 +469,10 @@
         similar to the same option of
         <varname>StandardInput=</varname>.</para>
 
+        <para>If the standard output (or error output, see below) of a unit is connected with the journal, syslog or
+        the kernel log buffer the unit will implicitly gain a dependency of type <varname>After=</varname> on
+        <filename>systemd-journald.socket</filename> (also see the automatic dependencies section above).</para>
+
         <para>This setting defaults to the value set with
         <option>DefaultStandardOutput=</option> in
         <citerefentry><refentrytitle>systemd-system.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
diff --git a/src/journal/journal-file.c b/src/journal/journal-file.c
index ac6c30f9f2..ff01e5aa94 100644
--- a/src/journal/journal-file.c
+++ b/src/journal/journal-file.c
@@ -707,7 +707,11 @@ int journal_file_move_to_object(JournalFile *f, ObjectType type, uint64_t offset
 
         /* Objects may only be located at multiple of 64 bit */
         if (!VALID64(offset))
-                return -EFAULT;
+                return -EBADMSG;
+
+        /* Object may not be located in the file header */
+        if (offset < le64toh(f->header->header_size))
+                return -EBADMSG;
 
         r = journal_file_move_to(f, type, false, offset, sizeof(ObjectHeader), &t);
         if (r < 0)
@@ -1980,9 +1984,14 @@ static int generic_array_bisect(
                 i = right - 1;
                 lp = p = le64toh(array->entry_array.items[i]);
                 if (p <= 0)
-                        return -EBADMSG;
-
-                r = test_object(f, p, needle);
+                        r = -EBADMSG;
+                else
+                        r = test_object(f, p, needle);
+                if (r == -EBADMSG) {
+                        log_debug_errno(r, "Encountered invalid entry while bisecting, cutting algorithm short. (1)");
+                        n = i;
+                        continue;
+                }
                 if (r < 0)
                         return r;
 
@@ -2058,9 +2067,14 @@ static int generic_array_bisect(
 
                                 p = le64toh(array->entry_array.items[i]);
                                 if (p <= 0)
-                                        return -EBADMSG;
-
-                                r = test_object(f, p, needle);
+                                        r = -EBADMSG;
+                                else
+                                        r = test_object(f, p, needle);
+                                if (r == -EBADMSG) {
+                                        log_debug_errno(r, "Encountered invalid entry while bisecting, cutting algorithm short. (2)");
+                                        right = n = i;
+                                        continue;
+                                }
                                 if (r < 0)
                                         return r;
 
@@ -2465,12 +2479,18 @@ int journal_file_next_entry(
                               le64toh(f->header->entry_array_offset),
                               i,
                               ret, &ofs);
+        if (r == -EBADMSG && direction == DIRECTION_DOWN) {
+                /* Special case: when we iterate throught the journal file linearly, and hit an entry we can't read,
+                 * consider this the end of the journal file. */
+                log_debug_errno(r, "Encountered entry we can't read while iterating through journal file. Considering this the end of the file.");
+                return 0;
+        }
         if (r <= 0)
                 return r;
 
         if (p > 0 &&
             (direction == DIRECTION_DOWN ? ofs <= p : ofs >= p)) {
-                log_debug("%s: entry array corrupted at entry %"PRIu64, f->path, i);
+                log_debug("%s: entry array corrupted at entry %" PRIu64, f->path, i);
                 return -EBADMSG;
         }
 
diff --git a/src/shared/logs-show.c b/src/shared/logs-show.c
index cd3d53669c..9351b85eed 100644
--- a/src/shared/logs-show.c
+++ b/src/shared/logs-show.c
@@ -287,7 +287,10 @@ static int output_short(
                 if (r < 0)
                         return r;
         }
-
+        if (r == -EBADMSG) {
+                log_debug_errno(r, "Skipping message we can't read: %m");
+                return 0;
+        }
         if (r < 0)
                 return log_error_errno(r, "Failed to get journal fields: %m");