|
 |
4fbe94 |
From 2d197adc6d7109d5901401a90288530582f3f991 Mon Sep 17 00:00:00 2001
|
|
|
4fbe94 |
From: =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= <zbyszek@in.waw.pl>
|
|
|
4fbe94 |
Date: Tue, 26 Feb 2019 13:00:35 +0100
|
|
|
4fbe94 |
Subject: [PATCH] fuzz-journal-stream: avoid assertion failure on samples which
|
|
|
4fbe94 |
don't fit in pipe
|
|
|
4fbe94 |
MIME-Version: 1.0
|
|
|
4fbe94 |
Content-Type: text/plain; charset=UTF-8
|
|
|
4fbe94 |
Content-Transfer-Encoding: 8bit
|
|
|
4fbe94 |
|
|
|
4fbe94 |
Fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=11587.
|
|
|
4fbe94 |
We had a sample which was large enough that write(2) failed to push all the
|
|
|
4fbe94 |
data into the pipe, and an assert failed. The code could be changed to use
|
|
|
4fbe94 |
a loop, but then we'd need to interleave writes and sd_event_run (to process
|
|
|
4fbe94 |
the journal). I don't think the complexity is worth it — fuzzing works best
|
|
|
4fbe94 |
if the sample is not too huge anyway. So let's just reject samples above 64k,
|
|
|
4fbe94 |
and tell oss-fuzz about this limit.
|
|
|
4fbe94 |
|
|
|
4fbe94 |
(cherry picked from commit eafadd069c4e30ed62173123326a7237448615d1)
|
|
|
4fbe94 |
|
|
|
4fbe94 |
Resolves: #1764560
|
|
|
4fbe94 |
---
|
|
|
4fbe94 |
src/fuzz/fuzz-journald-stream.c | 2 +-
|
|
|
4fbe94 |
src/fuzz/fuzz-journald-stream.options | 2 ++
|
|
|
4fbe94 |
2 files changed, 3 insertions(+), 1 deletion(-)
|
|
|
4fbe94 |
create mode 100644 src/fuzz/fuzz-journald-stream.options
|
|
|
4fbe94 |
|
|
|
4fbe94 |
diff --git a/src/fuzz/fuzz-journald-stream.c b/src/fuzz/fuzz-journald-stream.c
|
|
|
4fbe94 |
index 247c0889bc..693b197d3a 100644
|
|
|
4fbe94 |
--- a/src/fuzz/fuzz-journald-stream.c
|
|
|
4fbe94 |
+++ b/src/fuzz/fuzz-journald-stream.c
|
|
|
4fbe94 |
@@ -14,7 +14,7 @@ int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
|
|
|
4fbe94 |
StdoutStream *stream;
|
|
|
4fbe94 |
int v;
|
|
|
4fbe94 |
|
|
|
4fbe94 |
- if (size == 0)
|
|
|
4fbe94 |
+ if (size == 0 || size > 65536)
|
|
|
4fbe94 |
return 0;
|
|
|
4fbe94 |
|
|
|
4fbe94 |
if (!getenv("SYSTEMD_LOG_LEVEL"))
|
|
|
4fbe94 |
diff --git a/src/fuzz/fuzz-journald-stream.options b/src/fuzz/fuzz-journald-stream.options
|
|
|
4fbe94 |
new file mode 100644
|
|
|
4fbe94 |
index 0000000000..678d526b1e
|
|
|
4fbe94 |
--- /dev/null
|
|
|
4fbe94 |
+++ b/src/fuzz/fuzz-journald-stream.options
|
|
|
4fbe94 |
@@ -0,0 +1,2 @@
|
|
|
4fbe94 |
+[libfuzzer]
|
|
|
4fbe94 |
+max_len = 65536
|