Prevent adding '-' CLI flag to allowed paths as if it was an actual file

- This resulted in a bug where using stdin was effectively disabling allowed path checks.

Changelog.md

@@ -26,6 +26,7 @@ Compiler Features:
 Bugfixes:
  * Antlr Grammar: Fix parsing of import paths involving properly distinguishing between empty and non-empty string literals in general.
  * AST Output: Fix ``kind`` field of ``ModifierInvocation`` for base constructor calls.
+ * Commandline interface: Fix standard input bypassing allowed path checks.
  * SMTChecker: Fix false positive and false negative on ``push`` as LHS of a compound assignment.
  * SMTChecker: Fix false positive in contracts that cannot be deployed.
  * SMTChecker: Fix internal error on public getter returning dynamic data on older EVM versions where these are not available.

solc/CommandLineInterface.cpp

@@ -585,15 +585,15 @@ bool CommandLineInterface::readInputFilesAndConfigureRemappings()
 			if (eq != path.end())
 			{
 				if (auto r = ImportRemapper::parseRemapping(path))
-				{
 					m_remappings.emplace_back(std::move(*r));
-					path = string(eq + 1, path.end());
-				}
 				else
 				{
 					serr() << "Invalid remapping: \"" << path << "\"." << endl;
 					return false;
 				}
+
+				string remappingTarget(eq + 1, path.end());
+				m_fileReader.allowDirectory(boost::filesystem::path(remappingTarget).remove_filename());
 			}
 			else if (path == "-")
 				addStdin = true;
@@ -628,9 +628,8 @@ bool CommandLineInterface::readInputFilesAndConfigureRemappings()
 
 				// NOTE: we ignore the FileNotFound exception as we manually check above
 				m_fileReader.setSource(infile, readFileAsString(infile.string()));
-				path = boost::filesystem::canonical(infile).string();
+				m_fileReader.allowDirectory(boost::filesystem::path(boost::filesystem::canonical(infile).string()).remove_filename());
 			}
-			m_fileReader.allowDirectory(boost::filesystem::path(path).remove_filename());
 		}
 
 	if (addStdin)

test/cmdlineTests/stdin_allowed_paths/args

@@ -0,0 +1 @@
+-

test/cmdlineTests/stdin_allowed_paths/err

@@ -0,0 +1,11 @@
+Error: Source "too_long_line/input.sol" not found: File outside of allowed directories.
+ --> <stdin>:4:1:
+  |
+4 | import "../too_long_line/input.sol";
+  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Error: Source "error_codes/input.sol" not found: File outside of allowed directories.
+ --> stdin_allowed_paths/input.sol:4:1:
+  |
+4 | import "../error_codes/input.sol";
+  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

test/cmdlineTests/stdin_allowed_paths/exit

@@ -0,0 +1 @@
+1

test/cmdlineTests/stdin_allowed_paths/input.sol

@@ -0,0 +1,4 @@
+// SPDX-License-Identifier: GPL-3.0
+pragma solidity >=0.0;
+
+import "../error_codes/input.sol";

test/cmdlineTests/stdin_allowed_paths/stdin

@@ -0,0 +1,4 @@
+// SPDX-License-Identifier: GPL-3.0
+pragma solidity >=0.0;
+
+import "../too_long_line/input.sol";