Allow integer_overflow sanitizer path exclusion.

Add support for excluding paths from having integer_overflow applied to
them when using SANITIZE_TARGET=integer_overflow via an
INTEGER_OVERFLOW_EXCLUDE_PATHS make variable. This covers the soong side
of the change.

Bug: 30969751
Test: Build with SANITIZE_TARGET=integer_overflow
SANITIZE_TARGET_DIAG=integer_overflow
INTEGER_OVERFLOW_EXCLUDE_PATHS=<path> and confirmed this was no
longer being applied to binaries in that path.

Change-Id: I298b772f5425da28dff1cf007825be19558db3a8

android/config.go

@@ -530,20 +530,21 @@ func (c *deviceConfig) NativeCoverageEnabled() bool {
 func (c *deviceConfig) CoverageEnabledForPath(path string) bool {
 	coverage := false
 	if c.config.ProductVariables.CoveragePaths != nil {
-		for _, prefix := range *c.config.ProductVariables.CoveragePaths {
-			if strings.HasPrefix(path, prefix) {
+		if prefixInList(path, *c.config.ProductVariables.CoveragePaths) {
 			coverage = true
-				break
-			}
 		}
 	}
 	if coverage && c.config.ProductVariables.CoverageExcludePaths != nil {
-		for _, prefix := range *c.config.ProductVariables.CoverageExcludePaths {
-			if strings.HasPrefix(path, prefix) {
+		if prefixInList(path, *c.config.ProductVariables.CoverageExcludePaths) {
 			coverage = false
-				break
-			}
 		}
 	}
 	return coverage
 }
+
+func (c *config) IntegerOverflowDisabledForPath(path string) bool {
+	if c.ProductVariables.IntegerOverflowExcludePaths == nil {
+		return false
+	}
+	return prefixInList(path, *c.ProductVariables.IntegerOverflowExcludePaths)
+}

android/util.go

@@ -68,6 +68,15 @@ func inList(s string, list []string) bool {
 	return indexList(s, list) != -1
 }
 
+func prefixInList(s string, list []string) bool {
+	for _, prefix := range list {
+		if strings.HasPrefix(s, prefix) {
+			return true
+		}
+	}
+	return false
+}
+
 // checkCalledFromInit panics if a Go package's init function is not on the
 // call stack.
 func checkCalledFromInit() {

android/variable.go

@@ -140,6 +140,8 @@ type productVariables struct {
 	Treble                     *bool `json:",omitempty"`
 	Pdk                        *bool `json:",omitempty"`
 
+	IntegerOverflowExcludePaths *[]string `json:",omitempty"`
+
 	VendorPath *string `json:",omitempty"`
 
 	ClangTidy  *bool   `json:",omitempty"`

cc/sanitize.go

@@ -188,8 +188,10 @@ func (sanitize *sanitize) begin(ctx BaseModuleContext) {
 		}
 
 		if found, globalSanitizers = removeFromList("integer_overflow", globalSanitizers); found && s.Integer_overflow == nil {
+			if !ctx.AConfig().IntegerOverflowDisabledForPath(ctx.ModuleDir()) {
 				s.Integer_overflow = boolPtr(true)
 			}
+		}
 
 		if len(globalSanitizers) > 0 {
 			ctx.ModuleErrorf("unknown global sanitizer option %s", globalSanitizers[0])