Add CI support for Memory and UndefinedBehavior Sanitizers

This change adds two new build targets: MSan and UBSan. This is because
even though OSS-Fuzz is great and adds a lot of coverage, it only does
that for the fuzz targets, so the rest of the codebase is not
necessarily run with the Sanitizers ever :( So this change makes sure
that MSan/UBSan warnings don't make it into the codebase.

As part of this change, the Ubuntu focal container is introduced. It
builds mbedTLS and libssh2 as debug libraries into /usr/local and as
MSan-enabled libraries into /usr/local/msan. This latter part is needed
because MSan requires the binary and all its dependent libraries to be
built with MSan support so that memory allocations and deallocations are
tracked correctly to avoid false positives.

1 files changed, 42 insertions, 2 deletions

diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 02f19e2c6..794e7d491 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -28,6 +28,7 @@ jobs:
         container:
         - xenial
         - bionic
+        - focal
         - docurium
     runs-on: ubuntu-latest
     steps:
@@ -86,6 +87,26 @@ jobs:
             CMAKE_OPTIONS: -DUSE_HTTPS=mbedTLS -DUSE_SHA1=HTTPS -DREGEX_BACKEND=pcre -DDEPRECATE_HARD=ON -DUSE_LEAK_CHECKER=valgrind -DUSE_GSSAPI=ON
             CMAKE_GENERATOR: Ninja
           os: ubuntu-latest
+        - # Focal, Clang 10, mbedTLS, MemorySanitizer
+          image: focal
+          env:
+            CC: clang-10
+            CFLAGS: -fsanitize=memory -fsanitize-memory-track-origins=2 -fsanitize-blacklist=/home/libgit2/source/script/sanitizers.supp -fno-optimize-sibling-calls -fno-omit-frame-pointer
+            CMAKE_OPTIONS: -DCMAKE_PREFIX_PATH=/usr/local/msan -DUSE_HTTPS=mbedTLS -DUSE_SHA1=HTTPS -DREGEX_BACKEND=pcre -DDEPRECATE_HARD=ON -DUSE_BUNDLED_ZLIB=ON
+            CMAKE_GENERATOR: Ninja
+            SKIP_SSH_TESTS: true
+            ASAN_SYMBOLIZER_PATH: /usr/bin/llvm-symbolizer-10
+          os: ubuntu-latest
+        - # Focal, Clang 10, OpenSSL, UndefinedBehaviorSanitizer
+          image: focal
+          env:
+            CC: clang-10
+            CFLAGS: -fsanitize=undefined,nullability -fno-sanitize-recover=undefined,nullability -fsanitize-blacklist=/home/libgit2/source/script/sanitizers.supp -fno-optimize-sibling-calls -fno-omit-frame-pointer
+            CMAKE_OPTIONS: -DCMAKE_PREFIX_PATH=/usr/local -DUSE_HTTPS=OpenSSL -DUSE_SHA1=HTTPS -DREGEX_BACKEND=pcre -DDEPRECATE_HARD=ON -DUSE_BUNDLED_ZLIB=ON
+            CMAKE_GENERATOR: Ninja
+            SKIP_SSH_TESTS: true
+            ASAN_SYMBOLIZER_PATH: /usr/bin/llvm-symbolizer-10
+          os: ubuntu-latest
         - # macOS
           os: macos-10.15
           env:
@@ -161,7 +182,21 @@ jobs:
         export GITTEST_NEGOTIATE_PASSWORD="${{ secrets.GITTEST_NEGOTIATE_PASSWORD }}"
 
         if [ -n "${{ matrix.platform.image }}" ]; then
-          docker run -v $(pwd):/home/libgit2/source -w /home/libgit2/source -e CC -e CMAKE_GENERATOR -e CMAKE_OPTIONS -e PKG_CONFIG_PATH -e GITTEST_NEGOTIATE_PASSWORD -e SKIP_SSH_TESTS -e SKIP_NEGOTIATE_TESTS ${{ env.docker-registry-container-sha }} /bin/bash -c "mkdir build && cd build && ../azure-pipelines/build.sh && ../azure-pipelines/test.sh"
+          docker run \
+              --rm \
+              -v "$(pwd):/home/libgit2/source" \
+              -w /home/libgit2/source \
+              -e ASAN_SYMBOLIZER_PATH \
+              -e CC \
+              -e CFLAGS \
+              -e CMAKE_GENERATOR \
+              -e CMAKE_OPTIONS \
+              -e GITTEST_NEGOTIATE_PASSWORD \
+              -e PKG_CONFIG_PATH \
+              -e SKIP_NEGOTIATE_TESTS \
+              -e SKIP_SSH_TESTS \
+              ${{ env.docker-registry-container-sha }} \
+              /bin/bash -c "mkdir build && cd build && ../azure-pipelines/build.sh && ../azure-pipelines/test.sh"
         else
           mkdir build && cd build
           ../azure-pipelines/build.sh
@@ -189,7 +224,12 @@ jobs:
         git config user.email 'libgit2@users.noreply.github.com'
         git branch gh-pages origin/gh-pages
         docker login https://${{ env.docker-registry }} -u ${{ github.actor }} -p ${{ github.token }}
-        docker run --rm -v $(pwd):/home/libgit2/source -w /home/libgit2/source ${{ env.docker-registry }}/${{ github.repository }}/docurium:latest cm doc api.docurium
+        docker run \
+            --rm \
+            -v "$(pwd):/home/libgit2/source" \
+            -w /home/libgit2/source \
+            ${{ env.docker-registry }}/${{ github.repository }}/docurium:latest \
+            cm doc api.docurium
         git checkout gh-pages
         zip --exclude .git/\* --exclude .gitignore --exclude .gitattributes -r api-documentation.zip .
     - uses: actions/upload-artifact@v2