fix: use 0644 permissions for runtime data files in .func/#3867
fix: use 0644 permissions for runtime data files in .func/#3867Ankitsinghsisodya wants to merge 1 commit into
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Changed file permission mode from os.ModePerm to 0644 for files written in the Stamp and WriteRuntimeBuiltImage functions to ensure proper access control.
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Pull request overview
Note
Copilot was unable to run its full agentic suite in this review.
This PR tightens the permissions used when writing function build metadata files, avoiding overly permissive file modes.
Changes:
- Change
os.WriteFilepermissions fromos.ModePerm(0777) to0644when writing the built hash. - Change
os.WriteFilepermissions fromos.ModePerm(0777) to0644when writing the built image reference.
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| // Write out the hash | ||
| if err = os.WriteFile(filepath.Join(f.Root, RunDataDir, BuiltHash), []byte(hash), os.ModePerm); err != nil { | ||
| if err = os.WriteFile(filepath.Join(f.Root, RunDataDir, BuiltHash), []byte(hash), 0644); err != nil { |
| } | ||
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| return os.WriteFile(path, []byte(f.Build.Image), os.ModePerm) | ||
| return os.WriteFile(path, []byte(f.Build.Image), 0644) |
Codecov Report❌ Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## main #3867 +/- ##
==========================================
- Coverage 53.40% 52.45% -0.96%
==========================================
Files 200 200
Lines 23413 23413
==========================================
- Hits 12504 12281 -223
- Misses 9659 9889 +230
+ Partials 1250 1243 -7
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Problem
.func/built-imageand.func/built-hashwere written usingos.ModePerm(
0777), which sets the execute bit on plain data files and is inconsistentwith the rest of the codebase.
The
pkg/configpackage already writes~/.func/config.yamlwith explicit0600permissions and has a dedicated test enforcing this. The runtime datadirectory had no such discipline.
Changes
pkg/functions/function.go:577—BuiltHashfile now written with0644pkg/functions/function.go:833—BuiltImagefile now written with0644client.go:1277(MkdirAllfor the.func/directory) is intentionallyunchanged — using
os.ModePermwithMkdirAllis standard Go practice fordirectories; the umask produces the correct
0755result.Why 0644 and not 0600
These files contain build metadata (image references, content hashes), not
credentials. They do not need to be private to the owner.
0644gives theowner read/write and others read-only, with no execute bits — appropriate for
data files.
Testing
make testpasses with no changes to existing tests