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Add expect failed test for loading BPF program with global variables #816

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merged 1 commit into from
Dec 17, 2024

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Alan-Jowett
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@Alan-Jowett Alan-Jowett commented Dec 17, 2024

Add test that is currently expected to fail for loading BPF programs with global non-const variables.

Summary by CodeRabbit

  • New Features

    • Updated the subproject reference to a new commit, potentially including various improvements.
    • Added a new test case for verifying eBPF programs that utilize global variables, which are unsupported by the verifier.
  • Documentation

    • Included comments listing eBPF programs that cannot be verified for better context.

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coderabbitai bot commented Dec 17, 2024

Walkthrough

The pull request involves an update to the ebpf-samples subproject commit reference and the addition of a new test case in src/test/test_verify.cpp. The subproject commit is changed from 69a84e10ca1d838d8c0f948b5459bce4965ab7af to b1ec1a2c18c4c0dbb0e59994af71e6882596e604. A new test case is introduced to verify the behavior of eBPF programs with global variables, which are currently unsupported by the verifier.

Changes

File Change Summary
ebpf-samples Subproject commit updated from 69a84e10 to b1ec1a2c
src/test/test_verify.cpp Added new test case TEST_SECTION_FAIL("build", "global_variable.o", ".text") to test verification of eBPF programs with global variables

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📜 Recent review details

Configuration used: CodeRabbit UI
Review profile: ASSERTIVE
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 3289ffc and 5a8b48d.

📒 Files selected for processing (2)
  • ebpf-samples (1 hunks)
  • src/test/test_verify.cpp (1 hunks)
🔇 Additional comments (2)
ebpf-samples (1)

1-1: Verify submodule commit and its contents

✅ Verification successful

Submodule update aligns with global variable test implementation

The submodule update to commit b1ec1a2 is correct and matches the codebase changes:

  • Test file src/test/test_verify.cpp includes the corresponding test case for global variables
  • Submodule commit message confirms the addition of global variable test case
  • The changes are properly linked in both the main repository and the submodule
🏁 Scripts executed

The following scripts were executed for the analysis:

Script:

#!/bin/bash
# Description: Verify the submodule commit exists and contains expected changes
# Expected: Commit should exist and contain changes related to global variable testing

# Check if the commit exists and show its message
git ls-remote https://github.com/vbpf/ebpf-samples.git b1ec1a2c18c4c0dbb0e59994af71e6882596e604

# Search for global variable related files in the repository
fd global_variable --exec rg -l "global"

Length of output: 138


Script:

#!/bin/bash
# Let's verify the commit in the submodule directly
git submodule status ebpf-samples

# Check the actual content of the submodule reference file
cat .gitmodules

# Look for test files related to global variables
rg -l "global.*variable" src/test/

Length of output: 609


Script:

#!/bin/bash
# Check the content of the test file to verify global variable testing
rg -A 5 -B 5 "global.*variable" src/test/test_verify.cpp

# Check if the submodule is properly initialized and get its commit message
cd ebpf-samples && git show -s --format=%B HEAD

Length of output: 757

src/test/test_verify.cpp (1)

429-431: Verify the test case implementation.

The test case correctly validates that BPF programs with global variables fail verification.

Run the following script to verify the test implementation:

✅ Verification successful

Test case correctly validates unsupported global variables

The test case is properly implemented as a known failure test using TEST_SECTION_FAIL macro, which aligns with the current limitation of the verifier not supporting global variables. The test file location and implementation are consistent with the codebase's test structure.

🏁 Scripts executed

The following scripts were executed for the analysis:

Script:

#!/bin/bash
# Description: Verify the test case implementation and its dependencies.

# Test: Check if the test object file exists
fd -t f "global_variable.o" ebpf-samples/build/

# Test: Check if there are any other test cases for global variables
rg -B 2 -A 2 "global.*variable" 

Length of output: 542


Script:

#!/bin/bash
# Let's check the actual test file content and directory structure

# Find the test object file in the correct location
fd -t f "global_variable"

# Check the content of any global variable related test files
rg -l "global.*variable" | xargs cat

# Check the directory structure to locate test files
fd -t d "test"

Length of output: 37795


Script:

#!/bin/bash
# Let's check the actual test implementation for global variables

# Find and examine the global variable test file
fd -t f "global_variable" -x cat {}

# Check if there are any other related test files
fd -t f -e "cpp" -e "h" -x grep -l "global.*variable" {}

Length of output: 121


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@coveralls
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Coverage Status

coverage: 89.656% (+0.09%) from 89.57%
when pulling 5a8b48d on Alan-Jowett:global_variable_negative
into 3289ffc on vbpf:main.

@elazarg elazarg merged commit 7202c63 into vbpf:main Dec 17, 2024
19 checks passed
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3 participants