systemd/0058-tests-add-fuzz-bcd.patch

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2022-04-20 07:56:42 +00:00
From f06002981d2bd2a582d2252f7d509205bcc2a9ed Mon Sep 17 00:00:00 2001
From: Evgeny Vereshchagin <evvers@ya.ru>
Date: Sun, 26 Dec 2021 23:26:56 +0000
Subject: [PATCH] tests: add fuzz-bcd
(cherry picked from commit 4b65fc8725fa169bf870eb022d7b346796977c21)
Related: #2017035
---
src/boot/efi/fuzz-bcd.c | 26 ++++++++++++++++++++++++++
src/boot/efi/meson.build | 3 +++
tools/oss-fuzz.sh | 16 ++++++++++++++++
3 files changed, 45 insertions(+)
create mode 100644 src/boot/efi/fuzz-bcd.c
diff --git a/src/boot/efi/fuzz-bcd.c b/src/boot/efi/fuzz-bcd.c
new file mode 100644
index 0000000000..e5ed6638a4
--- /dev/null
+++ b/src/boot/efi/fuzz-bcd.c
@@ -0,0 +1,26 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include "alloc-util.h"
+#include "fd-util.h"
+#include "fuzz.h"
+#include "utf8.h"
+
+#include "bcd.c"
+
+int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
+ _cleanup_free_ void *p = NULL;
+
+ /* This limit was borrowed from src/boot/efi/boot.c */
+ if (size > 100*1024)
+ return 0;
+
+ if (!getenv("SYSTEMD_LOG_LEVEL"))
+ log_set_max_level(LOG_CRIT);
+
+ p = memdup(data, size);
+ assert_se(p);
+
+ char16_t *title = get_bcd_title(p, size);
+ assert_se(!title || char16_strlen(title) >= 0);
+ return 0;
+}
diff --git a/src/boot/efi/meson.build b/src/boot/efi/meson.build
index 16b34f0ac2..229771026d 100644
--- a/src/boot/efi/meson.build
+++ b/src/boot/efi/meson.build
@@ -358,6 +358,9 @@ if efi_arch[1] in ['ia32', 'x86_64', 'arm', 'aarch64']
[],
'HAVE_ZSTD'],
]
+ fuzzers += [
+ [['src/boot/efi/fuzz-bcd.c']],
+ ]
endif
systemd_boot_objects = []
diff --git a/tools/oss-fuzz.sh b/tools/oss-fuzz.sh
index 8a19da665e..ae57fc25d5 100755
--- a/tools/oss-fuzz.sh
+++ b/tools/oss-fuzz.sh
@@ -36,6 +36,13 @@ else
apt-get install -y gperf m4 gettext python3-pip \
libcap-dev libmount-dev libkmod-dev \
pkg-config wget python3-jinja2
+
+ # gnu-efi is installed here to enable -Dgnu-efi behind which fuzz-bcd
+ # is hidden. It isn't linked against efi. It doesn't
+ # even include "efi.h" because "bcd.c" can work in "unit test" mode
+ # where it isn't necessary.
+ apt-get install -y gnu-efi zstd
+
pip3 install -r .github/workflows/requirements.txt --require-hashes
# https://github.com/google/oss-fuzz/issues/6868
@@ -56,6 +63,15 @@ fi
ninja -v -C "$build" fuzzers
+# Compressed BCD files are kept in test/test-bcd so let's unpack them
+# and put them all in the seed corpus.
+bcd=$(mktemp -d)
+for i in test/test-bcd/*.zst; do
+ unzstd "$i" -o "$bcd/$(basename "${i%.zst}")";
+done
+zip -jqr "$OUT/fuzz-bcd_seed_corpus.zip" "$bcd"
+rm -rf "$bcd"
+
# The seed corpus is a separate flat archive for each fuzzer,
# with a fixed name ${fuzzer}_seed_corpus.zip.
for d in "$(dirname "$0")/../test/fuzz/fuzz-"*; do