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Prevent DoS (OOM) via massive packets #95

Merged
merged 2 commits into from
May 13, 2020

Commits on May 7, 2020

  1. Prevent DoS on large integer packet

    When maxHttpBufferSize is large (1e8 bytes), a payload of length 100MB
    can be sent like so:
    
    99999991:422222222222222222222222222222222222222222222...
    
    This massive packet can cause OOM via building up many many
    `ConsOneByteString` objects due to concatenation:
    99999989 `ConsOneByteString`s and then converting the massive integer to
    a `Number`.
    
    The performance can be improved to avoid this by using `substring`
    rather than building the string via concatenation.
    
    Below I tried one payload of length 7e7 as the 1e8 payload took so
    long to process that it timed out before running out of memory.
    
    ```
    ==== JS stack trace =========================================
    
        0: ExitFrame [pc: 0x13c5b79]
    Security context: 0x152fe7b808d1 <JSObject>
        1: decodeString [0x2dd385fb5d1] [/node_modules/socket.io-parser/index.js:~276] [pc=0xf59746881be](this=0x175d34c42b69 <JSGlobal Object>,0x14eccff10fe1 <Very long string[69999990]>)
        2: add [0x31fc2693da29] [/node_modules/socket.io-parser/index.js:242] [bytecode=0xa7ed6554889 offset=11](this=0x0a2881be5069 <Decoder map = 0x3ceaa8bf48c9>,0x14eccff10fe1 <Very...
    
    FATAL ERROR: Ineffective mark-compacts near heap limit Allocation failed - JavaScript heap out of memory
     1: 0xa09830 node::Abort() [node]
     2: 0xa09c55 node::OnFatalError(char const*, char const*) [node]
     3: 0xb7d71e v8::Utils::ReportOOMFailure(v8::internal::Isolate*, char const*, bool) [node]
     4: 0xb7da99 v8::internal::V8::FatalProcessOutOfMemory(v8::internal::Isolate*, char const*, bool) [node]
     5: 0xd2a1f5  [node]
     6: 0xd2a886 v8::internal::Heap::RecomputeLimits(v8::internal::GarbageCollector) [node]
     7: 0xd37105 v8::internal::Heap::PerformGarbageCollection(v8::internal::GarbageCollector, v8::GCCallbackFlags) [node]
     8: 0xd37fb5 v8::internal::Heap::CollectGarbage(v8::internal::AllocationSpace, v8::internal::GarbageCollectionReason, v8::GCCallbackFlags) [node]
     9: 0xd3965f v8::internal::Heap::HandleGCRequest() [node]
    10: 0xce8395 v8::internal::StackGuard::HandleInterrupts() [node]
    11: 0x1042cb6 v8::internal::Runtime_StackGuard(int, unsigned long*, v8::internal::Isolate*) [node]
    12: 0x13c5b79  [node]
    ```
    bcaller committed May 7, 2020
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Commits on May 8, 2020

  1. Configuration menu
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