compiling cario code

[efrat-starkware]

Type

• feature
• bugfix
• dev (no functional changes, no API changes)
• fmt (formatting, renaming)
• build
• docs
• testing

Description

Breaking changes?

• yes
• no

---

This change is 

[semgrep-code-starkware-libs]

Semgrep identified an issue in your code:
The application builds a file path from potentially untrusted data, which can lead to a path traversal vulnerability. An attacker can manipulate the path which the application uses to access files. If the application does not validate user input and sanitize file paths, sensitive files such as configuration or user data can be accessed, potentially creating or overwriting files. To prevent this vulnerability, validate and sanitize any input that is used to create references to file paths. Also, enforce strict file access controls. For example, choose privileges allowing public-facing applications to access only the required files.

Dataflow graph

flowchart LR
    classDef invis fill:white, stroke: none
    classDef default fill:#e7f5ff, color:#1c7fd6, stroke: none

    subgraph File0["<b>crates/cairo-compile-utils/src/lib.rs</b>"]
        direction LR
        %% Source

        subgraph Source
            direction LR

            v0["<a href=https://github.com/starkware-libs/bootloader-hints/blob/98d341a3e5ffab9a225e8524f4f31e02d54e4b3f/crates/cairo-compile-utils/src/lib.rs#L16 target=_blank style='text-decoration:none; color:#1c7fd6'>[Line: 16] entry.path()</a>"]
        end
        %% Intermediate

        %% Sink

        subgraph Sink
            direction LR

            v1["<a href=https://github.com/starkware-libs/bootloader-hints/blob/98d341a3e5ffab9a225e8524f4f31e02d54e4b3f/crates/cairo-compile-utils/src/lib.rs#L16 target=_blank style='text-decoration:none; color:#1c7fd6'>[Line: 16] entry.path()</a>"]
        end
    end
    %% Class Assignment
    Source:::invis
    Sink:::invis

    File0:::invis

    %% Connections

    Source --> Sink

Loading

To resolve this comment:

✨ Commit Assistant fix suggestion

Suggested change

	let content = fs::read_to_string(entry.path())?;
	// Ensure the entry's path is within the intended directory to prevent path traversal
	if !entry.path().starts_with(project_root) {
	continue; // Skip files outside the target directory
	}
	let content = fs::read_to_string(entry.path())?;

View step-by-step instructions

1. Validate that entry.path() only points to files within the intended directory (project_root) by checking that the entry's path starts with project_root. You can do this with entry.path().starts_with(project_root).
2. Before calling fs::read_to_string(entry.path()), add a check:
   if !entry.path().starts_with(project_root) { continue; }
3. Alternatively, if you expect only .cairo files in a fixed folder, consider filtering out any files with path components like .. or symlinks that could point outside the target directory, to prevent path traversal.
4. Reject or skip any files not meeting the above requirements before processing their contents.

This will make sure your code only reads files in your intended directory and avoids unwanted file access.

💬 Ignore this finding

Reply with Semgrep commands to ignore this finding.

• /fp <comment> for false positive
• /ar <comment> for acceptable risk
• /other <comment> for all other reasons

Alternatively, triage in Semgrep AppSec Platform to ignore the finding created by tainted-path.

_{You can view more details about this finding in the Semgrep AppSec Platform.}