[PATCH 3/3] fuzz: port fuzz-url-decode-mem from OSS-Fuzz
- From
Josh Steadmon <steadmon@google.com>
- Date
- Oct 10, 2024, 21:11 UTC
- Message-ID
- <4c9813313ccb620f2ac176ef9fe9223113523c75.1728594659.git.steadmon@google.com>
- In-Reply-To
- <cover.1728594659.git.steadmon@google.com>
From: Eric Sesterhenn <eric.sesterhenn@x41-dsec.de>
Git's fuzz tests are run continuously as part of OSS-Fuzz [1]. Several additional fuzz tests have been contributed directly to OSS-Fuzz; however, these tests are vulnerable to bitrot because they are not built during Git's CI runs, and thus breaking changes are much less likely to be noticed by Git contributors.
Port one of these tests back to the Git project: fuzz-url-decode-mem
This test was originally written by Eric Sesterhenn as part of a security audit of Git [2]. It was then contributed to the OSS-Fuzz repo in commit c58ac4492 (Git fuzzing: uncomment the existing and add new targets. (#11486), 2024-02-21) by Jaroslav Lobačevski. I (Josh Steadmon) have verified with both Eric and Jaroslav that they're OK with moving this test to the Git project.
[1] https://github.com/google/oss-fuzz [2] https://ostif.org/wp-content/uploads/2023/01/X41-OSTIF-Gitlab-Git-Security-Audit-20230117-public.pdf
Co-authored-by: Jaroslav Lobačevski <jarlob@gmail.com> Co-authored-by: Josh Steadmon <steadmon@google.com> Signed-off-by: Josh Steadmon <steadmon@google.com> --- Makefile | 1 + ci/run-build-and-minimal-fuzzers.sh | 1 + oss-fuzz/.gitignore | 1 + oss-fuzz/fuzz-url-decode-mem.c | 43 +++++++++++++++++++++++++++++ 4 files changed, 46 insertions(+) create mode 100644 oss-fuzz/fuzz-url-decode-mem.c
diff --git a/Makefile b/Makefile index 141e194bf5..2cd7a6e003 100644 --- a/Makefile +++ b/Makefile @@ -2383,6 +2383,7 @@ FUZZ_OBJS += oss-fuzz/fuzz-date.o FUZZ_OBJS += oss-fuzz/fuzz-pack-headers.o FUZZ_OBJS += oss-fuzz/fuzz-pack-idx.o FUZZ_OBJS += oss-fuzz/fuzz-parse-attr-line.o +FUZZ_OBJS += oss-fuzz/fuzz-url-decode-mem.o .PHONY: fuzz-objs fuzz-objs: $(FUZZ_OBJS) diff --git a/ci/run-build-and-minimal-fuzzers.sh b/ci/run-build-and-minimal-fuzzers.sh index 60fe8b0dfc..08c556c818 100755 --- a/ci/run-build-and-minimal-fuzzers.sh +++ b/ci/run-build-and-minimal-fuzzers.sh @@ -21,6 +21,7 @@ date \ pack-headers \ pack-idx \ parse-attr-line \ +url-decode-mem \ " for fuzzer in $fuzzers ; do diff --git a/oss-fuzz/.gitignore b/oss-fuzz/.gitignore index ec185f061c..f2d74de457 100644 --- a/oss-fuzz/.gitignore +++ b/oss-fuzz/.gitignore @@ -5,3 +5,4 @@ fuzz-date fuzz-pack-headers fuzz-pack-idx fuzz-parse-attr-line +fuzz-url-decode-mem diff --git a/oss-fuzz/fuzz-url-decode-mem.c b/oss-fuzz/fuzz-url-decode-mem.c new file mode 100644 index 0000000000..2342aa993b --- /dev/null +++ b/oss-fuzz/fuzz-url-decode-mem.c @@ -0,0 +1,43 @@ +#include "git-compat-util.h" +#include <stddef.h> +#include <stdlib.h> +#include <stdint.h> +#include <string.h> +#include <stdio.h> +#include "url.h" + +int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size); + +int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) +{ + char *buf; + char *r; + const char *pbuf; + + buf = malloc(size + 1); + if (!buf) + return 0; + + memcpy(buf, data, size); + buf[size] = 0; + + // start fuzzing + r = url_decode(buf); + free(r); + + r = url_percent_decode(buf); + free(r); + + pbuf = (const char*) buf; + r = url_decode_parameter_name(&pbuf); + free(r); + + pbuf = (const char*) buf; + r = url_decode_parameter_value(&pbuf); + free(r); + + // cleanup + free(buf); + + return 0; +}
-- 2.47.0.rc1.288.g06298d1525-goog