updater: Fix an off-by-1 bug in file_getprop().
Also add a testcase for file_getprop().
Test: recovery_component_test passes.
Change-Id: I8eb2f9a5702b43997ac9f4b29665eea087b1c146
diff --git a/tests/component/updater_test.cpp b/tests/component/updater_test.cpp
index a859f11..bd1df55 100644
--- a/tests/component/updater_test.cpp
+++ b/tests/component/updater_test.cpp
@@ -16,7 +16,9 @@
#include <string>
+#include <android-base/file.h>
#include <android-base/properties.h>
+#include <android-base/test_utils.h>
#include <gtest/gtest.h>
#include "edify/expr.h"
@@ -97,3 +99,51 @@
// sha1_check() expects at least one argument.
expect(nullptr, "sha1_check()", kArgsParsingFailure);
}
+
+TEST_F(UpdaterTest, file_getprop) {
+ // file_getprop() expects two arguments.
+ expect(nullptr, "file_getprop()", kArgsParsingFailure);
+ expect(nullptr, "file_getprop(\"arg1\")", kArgsParsingFailure);
+ expect(nullptr, "file_getprop(\"arg1\", \"arg2\", \"arg3\")", kArgsParsingFailure);
+
+ // File doesn't exist.
+ expect(nullptr, "file_getprop(\"/doesntexist\", \"key1\")", kFileGetPropFailure);
+
+ // Reject too large files (current limit = 65536).
+ TemporaryFile temp_file1;
+ std::string buffer(65540, '\0');
+ ASSERT_TRUE(android::base::WriteStringToFile(buffer, temp_file1.path));
+
+ // Read some keys.
+ TemporaryFile temp_file2;
+ std::string content("ro.product.name=tardis\n"
+ "# comment\n\n\n"
+ "ro.product.model\n"
+ "ro.product.board = magic \n");
+ ASSERT_TRUE(android::base::WriteStringToFile(content, temp_file2.path));
+
+ std::string script1("file_getprop(\"" + std::string(temp_file2.path) +
+ "\", \"ro.product.name\")");
+ expect("tardis", script1.c_str(), kNoCause);
+
+ std::string script2("file_getprop(\"" + std::string(temp_file2.path) +
+ "\", \"ro.product.board\")");
+ expect("magic", script2.c_str(), kNoCause);
+
+ // No match.
+ std::string script3("file_getprop(\"" + std::string(temp_file2.path) +
+ "\", \"ro.product.wrong\")");
+ expect("", script3.c_str(), kNoCause);
+
+ std::string script4("file_getprop(\"" + std::string(temp_file2.path) +
+ "\", \"ro.product.name=\")");
+ expect("", script4.c_str(), kNoCause);
+
+ std::string script5("file_getprop(\"" + std::string(temp_file2.path) +
+ "\", \"ro.product.nam\")");
+ expect("", script5.c_str(), kNoCause);
+
+ std::string script6("file_getprop(\"" + std::string(temp_file2.path) +
+ "\", \"ro.product.model\")");
+ expect("", script6.c_str(), kNoCause);
+}
diff --git a/updater/install.cpp b/updater/install.cpp
index efc96c4..19ba365 100644
--- a/updater/install.cpp
+++ b/updater/install.cpp
@@ -860,9 +860,13 @@
// file_getprop(file, key)
//
// interprets 'file' as a getprop-style file (key=value pairs, one
-// per line. # comment lines,blank lines, lines without '=' ignored),
+// per line. # comment lines, blank lines, lines without '=' ignored),
// and returns the value for 'key' (or "" if it isn't defined).
Value* FileGetPropFn(const char* name, State* state, int argc, Expr* argv[]) {
+ if (argc != 2) {
+ return ErrorAbort(state, kArgsParsingFailure, "%s() expects 2 args, got %d", name, argc);
+ }
+
std::vector<std::string> args;
if (!ReadArgs(state, 2, argv, &args)) {
return ErrorAbort(state, kArgsParsingFailure, "%s() Failed to parse the argument(s)", name);
@@ -876,11 +880,10 @@
filename.c_str(), strerror(errno));
}
-#define MAX_FILE_GETPROP_SIZE 65536
-
+ constexpr off_t MAX_FILE_GETPROP_SIZE = 65536;
if (st.st_size > MAX_FILE_GETPROP_SIZE) {
- return ErrorAbort(state, kFileGetPropFailure, "%s too large for %s (max %d)",
- filename.c_str(), name, MAX_FILE_GETPROP_SIZE);
+ return ErrorAbort(state, kFileGetPropFailure, "%s too large for %s (max %lld)",
+ filename.c_str(), name, static_cast<long long>(MAX_FILE_GETPROP_SIZE));
}
std::string buffer(st.st_size, '\0');
@@ -913,7 +916,7 @@
}
// trim whitespace between key and '='
- std::string str = android::base::Trim(line.substr(0, equal_pos - 1));
+ std::string str = android::base::Trim(line.substr(0, equal_pos));
// not the key we're looking for
if (key != str) continue;