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tests/fuzzing/fuzz_helpers.nim

@@ -44,7 +44,7 @@ type
 
 proc aflCompile*(target: string, c: Compiler) =
   let aflOptions = &"-d:standalone -d:noSignalHandler {$c}"
-  let compileCmd = &"nim c {defaultFlags} {aflOptions} {target}"
+  let compileCmd = &"""nim c {defaultFlags} {aflOptions} {target}"""
   exec compileCmd
 
 proc aflExec*(target: string, inputDir: string, resultsDir: string,
@@ -57,14 +57,14 @@ proc aflExec*(target: string, inputDir: string, resultsDir: string,
   var fuzzCmd: string
   # if there is an output dir already, continue fuzzing from previous run
   if (not dirExists(resultsDir)) or cleanStart:
-    fuzzCmd = &"afl-fuzz -i {inputDir} -o {resultsDir} -M fuzzer01 -- ./{target}"
+    fuzzCmd = &"""afl-fuzz -i {inputDir} -o {resultsDir} -M fuzzer01 -- ./{target}"""
   else:
-    fuzzCmd = &"afl-fuzz -i - -o {resultsDir} -M fuzzer01 -- ./{target}"
+    fuzzCmd = &"""afl-fuzz -i - -o {resultsDir} -M fuzzer01 -- ./{target}"""
   exec fuzzCmd
 
 proc libFuzzerCompile*(target: string) =
   let libFuzzerOptions = &"--noMain {libFuzzerClang}"
-  let compileCmd = &"nim c {defaultFlags} {libFuzzerOptions} {target}"
+  let compileCmd = &"""nim c {defaultFlags} {libFuzzerOptions} {target}"""
   exec compileCmd
 
 proc libFuzzerExec*(target: string, corpusDir: string) =
@@ -72,7 +72,7 @@ proc libFuzzerExec*(target: string, corpusDir: string) =
     # libFuzzer is OK when starting with empty corpus dir
     mkDir(corpusDir)
 
-  exec &"./{target} {corpusDir}"
+  exec &"""./{target} {corpusDir}"""
 
 proc getDir*(path: string): string =
   # TODO: This is not platform friendly at all.

tests/fuzzing/fuzztest.nim

@@ -1,4 +1,4 @@
-import streams, posix, strutils, chronicles, macros
+import streams, posix, strutils, chronicles, macros, stew/ranges/ptr_arith
 
 template fuzz(body) =
   # For code we want to fuzz, SIGSEGV is needed on unwanted exceptions.
@@ -27,9 +27,6 @@ proc readStdin*(): seq[byte] =
 
 proc NimMain() {.importc: "NimMain".}
 
-template `+`*[T](p: ptr T, off: int): ptr T =
-  cast[ptr type(p[])](cast[ByteAddress](p) +% off * sizeof(p[]))
-
 template test*(body: untyped): untyped =
   when defined(standalone):
     var payload {.inject.} = readStdin()
@@ -38,12 +35,8 @@ template test*(body: untyped): untyped =
   else:
     proc fuzzerCall(data: ptr byte, len: csize):
         cint {.exportc: "LLVMFuzzerTestOneInput".} =
-      var payload {.inject.} : seq[byte]
-      if len > 0:
-        # TODO: something better to get this data in the seq?
-        newSeq(payload, len)
-        for i in 0..<len:
-          payload[i] = (data + i)[]
+      template payload(): auto =
+        makeOpenArray(data, len)
 
       `body`
 

tests/fuzzing/rlp/fuzz.nim

@@ -6,7 +6,7 @@ init:
 
 test:
   try:
-    var rlp = rlpFromBytes(payload.toRange)
+    var rlp = rlpFromBytes(@payload.toRange)
     discard rlp.inspect()
   except RlpError:
     debug "Inspect failed", err = getCurrentExceptionMsg()

tests/p2p/p2p_test_helper.nim

@@ -33,8 +33,9 @@ template asyncTest*(name, body: untyped) =
     proc scenario {.async.} = body
     waitFor scenario()
 
-proc packData*(payload: seq[byte], pk: PrivateKey): seq[byte] =
+proc packData*(payload: openArray[byte], pk: PrivateKey): seq[byte] =
   let
+    payloadSeq = @payload
     signature = @(pk.signMessage(payload).getRaw())
-    msgHash = keccak256.digest(signature & payload)
-  result = @(msgHash.data) & signature & payload
+    msgHash = keccak256.digest(signature & payloadSeq)
+  result = @(msgHash.data) & signature & payloadSeq