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runtime: fix stack split at bad time when fuzzing

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Fix #53190

Change-Id: I6c1f9c3ab58818d3a9f05ddaa02fc247e53677d3
GitHub-Last-Rev: 13b0749c13
GitHub-Pull-Request: golang/go#53191
Reviewed-on: https://go-review.googlesource.com/c/go/+/410034
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
This commit is contained in:
Khaled Yakdan 2022-06-09 07:29:14 +00:00 committed by Michael Knyszek
parent 2cfbef4380
commit 386245b68e
1 changed files with 12 additions and 0 deletions
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12
src/runtime/libfuzzer.go
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@ -15,41 +15,53 @@ func libfuzzerCall4(fn *byte, fakePC uintptr, s1, s2 unsafe.Pointer, result uint
// Keep in sync with the definition of ret_sled in src/runtime/libfuzzer_amd64.s
const retSledSize = 512
// In libFuzzer mode, the compiler inserts calls to libfuzzerTraceCmpN and libfuzzerTraceConstCmpN
// (where N can be 1, 2, 4, or 8) for encountered integer comparisons in the code to be instrumented.
// This may result in these functions having callers that are nosplit. That is why they must be nosplit.
//
//go:nosplit
func libfuzzerTraceCmp1(arg0, arg1 uint8, fakePC int) {
fakePC = fakePC % retSledSize
libfuzzerCallTraceIntCmp(&__sanitizer_cov_trace_cmp1, uintptr(arg0), uintptr(arg1), uintptr(fakePC))
}
//go:nosplit
func libfuzzerTraceCmp2(arg0, arg1 uint16, fakePC int) {
fakePC = fakePC % retSledSize
libfuzzerCallTraceIntCmp(&__sanitizer_cov_trace_cmp2, uintptr(arg0), uintptr(arg1), uintptr(fakePC))
}
//go:nosplit
func libfuzzerTraceCmp4(arg0, arg1 uint32, fakePC int) {
fakePC = fakePC % retSledSize
libfuzzerCallTraceIntCmp(&__sanitizer_cov_trace_cmp4, uintptr(arg0), uintptr(arg1), uintptr(fakePC))
}
//go:nosplit
func libfuzzerTraceCmp8(arg0, arg1 uint64, fakePC int) {
fakePC = fakePC % retSledSize
libfuzzerCallTraceIntCmp(&__sanitizer_cov_trace_cmp8, uintptr(arg0), uintptr(arg1), uintptr(fakePC))
}
//go:nosplit
func libfuzzerTraceConstCmp1(arg0, arg1 uint8, fakePC int) {
fakePC = fakePC % retSledSize
libfuzzerCallTraceIntCmp(&__sanitizer_cov_trace_const_cmp1, uintptr(arg0), uintptr(arg1), uintptr(fakePC))
}
//go:nosplit
func libfuzzerTraceConstCmp2(arg0, arg1 uint16, fakePC int) {
fakePC = fakePC % retSledSize
libfuzzerCallTraceIntCmp(&__sanitizer_cov_trace_const_cmp2, uintptr(arg0), uintptr(arg1), uintptr(fakePC))
}
//go:nosplit
func libfuzzerTraceConstCmp4(arg0, arg1 uint32, fakePC int) {
fakePC = fakePC % retSledSize
libfuzzerCallTraceIntCmp(&__sanitizer_cov_trace_const_cmp4, uintptr(arg0), uintptr(arg1), uintptr(fakePC))
}
//go:nosplit
func libfuzzerTraceConstCmp8(arg0, arg1 uint64, fakePC int) {
fakePC = fakePC % retSledSize
libfuzzerCallTraceIntCmp(&__sanitizer_cov_trace_const_cmp8, uintptr(arg0), uintptr(arg1), uintptr(fakePC))