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- Set chmod 700 on backup and log directories - Use umask 077 when creating zip archives to ensure they are only readable by owner Co-authored-by: kidchenko <5432753+kidchenko@users.noreply.github.com>
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📝 WalkthroughWalkthroughAdds security documentation for a backup permissions vulnerability and implements fixes in the backup script by restricting directory permissions to mode 700 and applying umask 077 during archival operations to prevent overly permissive file creation. Changes
Estimated code review effort🎯 2 (Simple) | ⏱️ ~8 minutes Poem
🚥 Pre-merge checks | ✅ 3✅ Passed checks (3 passed)
✏️ Tip: You can configure your own custom pre-merge checks in the settings. ✨ Finishing Touches
🧪 Generate unit tests (beta)
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Actionable comments posted: 1
Caution
Some comments are outside the diff and can’t be posted inline due to platform limitations.
⚠️ Outside diff range comments (1)
tools/backup-projects.sh (1)
352-360:⚠️ Potential issue | 🟡 MinorTOCTOU race: directory briefly has default permissions between
mkdirandchmod.The current approach creates the directory with default umask permissions, then restricts them. An attacker with local access could theoretically read or traverse the directory during that brief window. Use
mkdir -m 700to create with correct permissions atomically.🛡️ Proposed fix
# Setup directories if [[ "$DRY_RUN" != true ]]; then - mkdir -p "$BACKUP_TEMP_DIR" - chmod 700 "$BACKUP_TEMP_DIR" - mkdir -p "$LOG_DIR" - chmod 700 "$LOG_DIR" + mkdir -p -m 700 "$BACKUP_TEMP_DIR" + mkdir -p -m 700 "$LOG_DIR" else🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@tools/backup-projects.sh` around lines 352 - 360, Replace the two-step create+chmod sequence with an atomic create using mkdir -m 700 for both BACKUP_TEMP_DIR and LOG_DIR when DRY_RUN is not true; keep the existing debug messages for the dry-run branch. Specifically, in the block that checks DRY_RUN, call mkdir -p -m 700 "$BACKUP_TEMP_DIR" and mkdir -p -m 700 "$LOG_DIR" (instead of mkdir then chmod) so the directories are created with correct permissions immediately.
🤖 Prompt for all review comments with AI agents
Verify each finding against the current code and only fix it if needed.
Inline comments:
In @.jules/sentinel.md:
- Around line 1-4: Change the heading in .jules/sentinel.md from "## 2026-02-26
- Insecure Backup Permissions" to a top-level heading using a single "#" and add
a blank line after it; then wrap or reflow the longer lines describing the
vulnerability, learning, and prevention so each line is <=80 characters
(preserve mentions of tools/backup-projects.sh, umask 077, and chmod 700),
keeping the same content and bullet structure to satisfy the markdown linter.
---
Outside diff comments:
In `@tools/backup-projects.sh`:
- Around line 352-360: Replace the two-step create+chmod sequence with an atomic
create using mkdir -m 700 for both BACKUP_TEMP_DIR and LOG_DIR when DRY_RUN is
not true; keep the existing debug messages for the dry-run branch. Specifically,
in the block that checks DRY_RUN, call mkdir -p -m 700 "$BACKUP_TEMP_DIR" and
mkdir -p -m 700 "$LOG_DIR" (instead of mkdir then chmod) so the directories are
created with correct permissions immediately.
| ## 2026-02-26 - Insecure Backup Permissions | ||
| **Vulnerability:** The backup script `tools/backup-projects.sh` created project archives and log files with default umask permissions (often 644/755), making them readable by other users on the system. | ||
| **Learning:** Shell scripts creating sensitive archives often default to system umask, which is usually designed for collaboration, not secrecy. | ||
| **Prevention:** Explicitly set `umask 077` in a subshell before running archival commands like `zip` or `tar`, and use `chmod 700` on sensitive directories immediately after creation. |
There was a problem hiding this comment.
Fix markdown linting errors flagged by CI.
The documentation content is accurate, but static analysis reports formatting issues:
- Line 1 should be a top-level heading (
#) with a blank line below - Lines 2-4 exceed the 80-character limit
🔧 Proposed fix
-## 2026-02-26 - Insecure Backup Permissions
-**Vulnerability:** The backup script `tools/backup-projects.sh` created project archives and log files with default umask permissions (often 644/755), making them readable by other users on the system.
-**Learning:** Shell scripts creating sensitive archives often default to system umask, which is usually designed for collaboration, not secrecy.
-**Prevention:** Explicitly set `umask 077` in a subshell before running archival commands like `zip` or `tar`, and use `chmod 700` on sensitive directories immediately after creation.
+# Sentinel Security Findings
+
+## 2026-02-26 - Insecure Backup Permissions
+
+**Vulnerability:** The backup script `tools/backup-projects.sh` created project
+archives and log files with default umask permissions (often 644/755), making
+them readable by other users on the system.
+
+**Learning:** Shell scripts creating sensitive archives often default to system
+umask, which is usually designed for collaboration, not secrecy.
+
+**Prevention:** Explicitly set `umask 077` in a subshell before running
+archival commands like `zip` or `tar`, and use `chmod 700` on sensitive
+directories immediately after creation.📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| ## 2026-02-26 - Insecure Backup Permissions | |
| **Vulnerability:** The backup script `tools/backup-projects.sh` created project archives and log files with default umask permissions (often 644/755), making them readable by other users on the system. | |
| **Learning:** Shell scripts creating sensitive archives often default to system umask, which is usually designed for collaboration, not secrecy. | |
| **Prevention:** Explicitly set `umask 077` in a subshell before running archival commands like `zip` or `tar`, and use `chmod 700` on sensitive directories immediately after creation. | |
| # Sentinel Security Findings | |
| ## 2026-02-26 - Insecure Backup Permissions | |
| **Vulnerability:** The backup script `tools/backup-projects.sh` created project | |
| archives and log files with default umask permissions (often 644/755), making | |
| them readable by other users on the system. | |
| **Learning:** Shell scripts creating sensitive archives often default to system | |
| umask, which is usually designed for collaboration, not secrecy. | |
| **Prevention:** Explicitly set `umask 077` in a subshell before running | |
| archival commands like `zip` or `tar`, and use `chmod 700` on sensitive | |
| directories immediately after creation. |
🧰 Tools
🪛 GitHub Check: Lint Documentation
[failure] 4-4: Line length
.jules/sentinel.md:4:81 MD013/line-length Line length [Expected: 80; Actual: 183] https://github.com/DavidAnson/markdownlint/blob/v0.34.0/doc/md013.md
[failure] 3-3: Line length
.jules/sentinel.md:3:81 MD013/line-length Line length [Expected: 80; Actual: 144] https://github.com/DavidAnson/markdownlint/blob/v0.34.0/doc/md013.md
[failure] 2-2: Line length
.jules/sentinel.md:2:81 MD013/line-length Line length [Expected: 80; Actual: 201] https://github.com/DavidAnson/markdownlint/blob/v0.34.0/doc/md013.md
[failure] 1-1: First line in a file should be a top-level heading
.jules/sentinel.md:1 MD041/first-line-heading/first-line-h1 First line in a file should be a top-level heading [Context: "## 2026-02-26 - Insecure Backu..."] https://github.com/DavidAnson/markdownlint/blob/v0.34.0/doc/md041.md
[failure] 1-1: Headings should be surrounded by blank lines
.jules/sentinel.md:1 MD022/blanks-around-headings Headings should be surrounded by blank lines [Expected: 1; Actual: 0; Below] [Context: "## 2026-02-26 - Insecure Backup Permissions"] https://github.com/DavidAnson/markdownlint/blob/v0.34.0/doc/md022.md
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.
In @.jules/sentinel.md around lines 1 - 4, Change the heading in
.jules/sentinel.md from "## 2026-02-26 - Insecure Backup Permissions" to a
top-level heading using a single "#" and add a blank line after it; then wrap or
reflow the longer lines describing the vulnerability, learning, and prevention
so each line is <=80 characters (preserve mentions of tools/backup-projects.sh,
umask 077, and chmod 700), keeping the same content and bullet structure to
satisfy the markdown linter.
1 participant
🚨 Severity: HIGH
💡 Vulnerability: Backup archives and logs were created with default umask permissions (often 644/755), allowing other users on the system to read potentially sensitive project code and logs.
🎯 Impact: Information disclosure of private repositories, API keys in code, and remote URLs.
🔧 Fix: Enforced chmod 700 on backup/log directories and umask 077 during zip creation.
✅ Verification: Verified that new backup files are created with -rw------- and directories with drwx------.
PR created automatically by Jules for task 3768380392851558610 started by @kidchenko
Summary by CodeRabbit
Release Notes
Security Fixes
Documentation