55 lines
2.2 KiB
Diff
55 lines
2.2 KiB
Diff
From 9f53d3cded6cf7eccb40c810dfb8fd6e101c7a3b Mon Sep 17 00:00:00 2001
|
|
From: =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= <zbyszek@in.waw.pl>
|
|
Date: Wed, 5 Dec 2018 22:45:02 +0100
|
|
Subject: [PATCH] journald: set a limit on the number of fields (1k)
|
|
|
|
We allocate a iovec entry for each field, so with many short entries,
|
|
our memory usage and processing time can be large, even with a relatively
|
|
small message size. Let's refuse overly long entries.
|
|
|
|
CVE-2018-16865
|
|
https://bugzilla.redhat.com/show_bug.cgi?id=1653861
|
|
|
|
What from I can see, the problem is not from an alloca, despite what the CVE
|
|
description says, but from the attack multiplication that comes from creating
|
|
many very small iovecs: (void* + size_t) for each three bytes of input message.
|
|
|
|
(cherry-picked from commit 052c57f132f04a3cf4148f87561618da1a6908b4)
|
|
|
|
Resolves: #1664977
|
|
---
|
|
src/journal/journal-file.h | 3 +++
|
|
src/journal/journald-native.c | 5 +++++
|
|
2 files changed, 8 insertions(+)
|
|
|
|
diff --git a/src/journal/journal-file.h b/src/journal/journal-file.h
|
|
index c8114ee2d0..cd8a48a364 100644
|
|
--- a/src/journal/journal-file.h
|
|
+++ b/src/journal/journal-file.h
|
|
@@ -165,6 +165,9 @@ int journal_file_open_reliably(
|
|
* files without adding too many zeros. */
|
|
#define OFSfmt "%06"PRIx64
|
|
|
|
+/* The maximum number of fields in an entry */
|
|
+#define ENTRY_FIELD_COUNT_MAX 1024
|
|
+
|
|
static inline bool VALID_REALTIME(uint64_t u) {
|
|
/* This considers timestamps until the year 3112 valid. That should be plenty room... */
|
|
return u > 0 && u < (1ULL << 55);
|
|
diff --git a/src/journal/journald-native.c b/src/journal/journald-native.c
|
|
index 5ff22a10af..951d092053 100644
|
|
--- a/src/journal/journald-native.c
|
|
+++ b/src/journal/journald-native.c
|
|
@@ -140,6 +140,11 @@ static int server_process_entry(
|
|
}
|
|
|
|
/* A property follows */
|
|
+ if (n > ENTRY_FIELD_COUNT_MAX) {
|
|
+ log_debug("Received an entry that has more than " STRINGIFY(ENTRY_FIELD_COUNT_MAX) " fields, ignoring entry.");
|
|
+ r = 1;
|
|
+ goto finish;
|
|
+ }
|
|
|
|
/* n existing properties, 1 new, +1 for _TRANSPORT */
|
|
if (!GREEDY_REALLOC(iovec, m,
|