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[asan] print the 'unexpected format specifier in printf interceptor' warning just once (came up in https://github.com/google/oss-fuzz/pull/562). Not touching a similar scanf warning -- for some reason it does not fire for me. 

llvm-svn: 302064
This commit is contained in:
Kostya Serebryany 2017-05-03 18:38:34 +00:00
parent 23f314d04f
commit 8c34243a13
2 changed files with 20 additions and 4 deletions
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12
compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors_format.inc
View File

@ -325,8 +325,8 @@ static void scanf_common(void *ctx, int n_inputs, bool allowGnuMalloc,
continue;
int size = scanf_get_value_size(&dir);
if (size == FSS_INVALID) {
Report("WARNING: unexpected format specifier in scanf interceptor: "
"%.*s\n", dir.end - dir.begin, dir.begin);
Report("%s: WARNING: unexpected format specifier in scanf interceptor: ",
SanitizerToolName, "%.*s\n", dir.end - dir.begin, dir.begin);
break;
}
void *argp = va_arg(aq, void *);
@ -520,8 +520,12 @@ static void printf_common(void *ctx, const char *format, va_list aq) {
continue;
int size = printf_get_value_size(&dir);
if (size == FSS_INVALID) {
Report("WARNING: unexpected format specifier in printf "
"interceptor: %.*s\n", dir.end - dir.begin, dir.begin);
static int ReportedOnce;
if (!ReportedOnce++)
Report(
"%s: WARNING: unexpected format specifier in printf "
"interceptor: %.*s (reported once per process)\n",
SanitizerToolName, dir.end - dir.begin, dir.begin);
break;
}
if (dir.convSpecifier == 'n') {

12
compiler-rt/test/sanitizer_common/TestCases/Linux/unexpected_format_specifier_test.cc Normal file
View File

@ -0,0 +1,12 @@
// RUN: %clang -w -O0 %s -o %t && %run %t 2>&1 | FileCheck %s
// UNSUPPORTED: lsan
// UNSUPPORTED: msan
#include <stdio.h>
int main() {
int a;
printf("%Q\n", 1);
printf("%Q\n", 1);
printf("%Q\n", 1);
}
// CHECK: unexpected format specifier in printf interceptor: %Q (reported once per process)
// CHECK-NOT: unexpected format specifier in printf interceptor