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runtime: mark string comparison hooks as no split 

These functions can be inserted by the compiler into the code to be
instrumented. This may result in these functions having callers that
are nosplit. That is why they must be nosplit.
This is a followup for CL 410034 in order to fix #53190.
This commit is contained in:
Khaled Yakdan 2022-06-25 00:02:13 +02:00
parent 6b6c64b1cc
commit 6506d86f22
1 changed files with 4 additions and 0 deletions
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4
src/runtime/libfuzzer.go
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@ -92,6 +92,8 @@ func init() {
// 4. result: an integer representing the comparison result. 0 indicates
// equality (comparison will ignored by libfuzzer), non-zero indicates a
// difference (comparison will be taken into consideration).
//
//go:nosplit
func libfuzzerHookStrCmp(s1, s2 string, fakePC int) {
if s1 != s2 {
libfuzzerCall4(&__sanitizer_weak_hook_strcmp, uintptr(fakePC), cstring(s1), cstring(s2), uintptr(1))
@ -102,6 +104,8 @@ func libfuzzerHookStrCmp(s1, s2 string, fakePC int) {
// This function has now the same implementation as libfuzzerHookStrCmp because we lack better checks
// for case-insensitive string equality in the runtime package.
//
//go:nosplit
func libfuzzerHookEqualFold(s1, s2 string, fakePC int) {
if s1 != s2 {
libfuzzerCall4(&__sanitizer_weak_hook_strcmp, uintptr(fakePC), cstring(s1), cstring(s2), uintptr(1))