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CVE-2026-3910 Graph Diff

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106 linhas

44 adições

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96 linhas

----- After graph building -----

----- After Phi untagging -----

Graph

17: Constant(0x21ff0101e4ed <FeedbackCell[one closure]>), 3 uses

3: Constant(0x21ff0101e589 <JSFunction trigger (sfi = 0x21ff0101e451)>), 6 uses

4: Constant(0x21ff0101e50d <ScriptContext[3]>), 6 uses

46: Constant(0x21ff0104b819 <Object map = 0x21ff0101e5bd>), 1 uses

5: RootConstant(undefined_value), 1 uses

12: RootConstant(true_value), 0 uses 🪦

28: RootConstant(false_value), 0 uses 🪦

19: RootConstant(optimized_out), 0 uses 🪦

8: SmiConstant(0), 2 uses

22: SmiConstant(1), 1 uses

22: SmiConstant(1), 0 uses 🪦

37: SmiConstant(3), 1 uses

9: SmiConstant(5), 1 uses

43: SmiConstant(42), 1 uses

10: Int32Constant(0), 3 uses, cannot truncate to int32

10: Int32Constant(0), 1 uses, cannot truncate to int32

16: Int32Constant(1), 1 uses, cannot truncate to int32

16: Int32Constant(1), 2 uses, cannot truncate to int32

39: Int32Constant(3), 2 uses, cannot truncate to int32

11: Int32Constant(5), 2 uses, cannot truncate to int32

Block b0

0x21ff0101e451 <SharedFunctionInfo trigger> (0x21ff0104a989 <String[6]: "poc.js">:16:16)

0 : 0c LdaZero

1: InitialValue(<this>), 6 uses

2: InitialValue(a0), 8 uses

6: FunctionEntryStackCheck

↳ lazy @-1 (3 live vars)

7: Jump b1

↓

Block b1

0x21ff0101e451 <SharedFunctionInfo trigger> (0x21ff0104a989 <String[6]: "poc.js">:0:0)

14 : 40 f9 01 Add r0, FBV[1]

↱ eager @14 (6 live vars)

13: CheckedSmiUntag [n2], 2 uses, cannot truncate to int32

↱ eager @14 (6 live vars)

14: Int32Add [n13, n10], 3 uses, can truncate to int32 [-2147483648, 2147483647]

14: Int32AddWithOverflow [n13, n10], 1 uses, can truncate to int32 [-2147483648, 2147483647]

17 : 53 00 00 BitwiseOrSmi [0], FBV[0]

15: Int32BitwiseOr [n14, n10], 2 uses, cannot truncate to int32

26 : 95 16 00 03 JumpLoop [22], [0], FBV[3]

18: ReduceInterruptBudgetForLoop(17) [n17]

↳ lazy @26 (5 live vars)

21: Int32ToNumber[kCanonicalizeSmi] [n15], 1 uses

21: Int32ToNumber[kCanonicalizeSmi] [n14], 0 uses 🪦

20: Jump b2

│ with gap moves:

│ - n21 → 23: φᵀ r0

│ - n14 → 23: φᴵ r0

│ - n22 → 24: φᵀ r2

│ - n16 → 24: φᴵ r2

▼

╭─►Block b2 peeled (effects:)

│ 23: φᵀ r0 (n21, n35), 5 uses

│ 23: φᴵ r0 (n14, n30), 8 uses

│ 24: φᵀ r2 (n22, n36), 2 uses

│ 24: φᴵ r2 (n16, n32), 5 uses

│ 6 : 77 f7 01 00 TestLessThan r2, EmbeddedFeedback[0x1]

│ ↱ eager @6 (6 live vars)

│ 26: Int32Compare[LessThan] [n24, n11], 0 uses 🪦

│ 25: CheckedSmiUntag [n24], 3 uses, cannot truncate to int32

│ 26: Int32Compare[LessThan] [n25, n11], 0 uses 🪦

│ 10 : a6 14 JumpIfFalse [20]

│╭──27: BranchIfInt32Compare(LessThan) [n25, n11] b3 b4

│╭──27: BranchIfInt32Compare(LessThan) [n24, n11] b3 b4

││ ↓

││ Block b3

││ 14 : 40 f9 01 Add r0, FBV[1]

││ ↱ eager @6 (6 live vars)

││ 30: Int32Add [n13, n23], 3 uses, can truncate to int32 [-2147483648, 2147483647]

││ 29: CheckedSmiUntag [n23], 1 uses, cannot truncate to int32

││ ↱ eager @6 (6 live vars)

││ 30: Int32AddWithOverflow [n13, n29], 1 uses, can truncate to int32 [-2147483648, 2147483647]

││ 17 : 53 00 00 BitwiseOrSmi [0], FBV[0]

││ 31: Int32BitwiseOr [n30, n10], 2 uses, cannot truncate to int32

││ 23 : 59 02 Inc FBV[2]

││ ↱ eager @6 (6 live vars)

││ 32: Int32IncrementWithOverflow [n25], 2 uses, cannot truncate to int32

││ 32: Int32IncrementWithOverflow [n24], 3 uses, cannot truncate to int32

││ 26 : 95 16 00 03 JumpLoop [22], [0], FBV[3]

││ 33: ReduceInterruptBudgetForLoop(17) [n17]

││ ↳ lazy @26 (5 live vars)

││ 35: Int32ToNumber[kCanonicalizeSmi] [n31], 1 uses

││ 35: Int32ToNumber[kCanonicalizeSmi] [n30], 0 uses 🪦

││ 36: Int32ToNumber[kCanonicalizeSmi] [n32], 1 uses

││ 36: Int32ToNumber[kCanonicalizeSmi] [n32], 0 uses 🪦

││ ↱ eager @6 (6 live vars)

╰─◄─34: JumpLoop b2

│ with gap moves:

│ - n35 → 23: φᵀ r0

│ - n30 → 23: φᴵ r0

│ - n36 → 24: φᵀ r2

│ - n32 → 24: φᴵ r2

│

╰►Block b4

32 : 78 f9 01 00 TestGreaterThan r0, EmbeddedFeedback[0x1]

↱ eager @32 (5 live vars)

40: Int32Compare[GreaterThan] [n23, n39], 0 uses 🪦

38: CheckedSmiUntag [n23], 2 uses, cannot truncate to int32

40: Int32Compare[GreaterThan] [n38, n39], 0 uses 🪦

36 : a6 06 JumpIfFalse [6]

╭───41: BranchIfInt32Compare(GreaterThan) [n38, n39] b5 b6

╭───41: BranchIfInt32Compare(GreaterThan) [n23, n39] b5 b6

│ ↓

│ Block b5

│ 50: Int32ToNumber[kCanonicalizeSmi] [n23], 1 uses

│ 40 : 96 04 Jump [4]

│╭──42: Jump b7

││ with gap moves:

││ - n23 → 45: φᵀ <accumulator>

││ - n50 → 45: φᵀ <accumulator>

││

╰─►Block b6

│ 44 : d1 Star1

│ 44: Jump b7

│ │ with gap moves:

│ │ - n43 → 45: φᵀ <accumulator>

│ ▼

╰►Block b7

45: φᵀ <accumulator> (n23, n43), 1 uses

45: φᵀ <accumulator> (n50, n43), 1 uses

52 : 39 f6 01 04 SetNamedProperty r3, [1:"x"], FBV[4]

47: StoreTaggedFieldNoWriteBarrier(0xc: 0x21ff00003665 <String[1]: #x>) [n46, n45]

57 : b7 Return

48: ReduceInterruptBudgetForReturn(57) [n17]

49: Return [n5]

Diferenças salvas

Texto original

Abrir arquivo

----- After graph building -----
Graph

17: Constant(0x21ff0101e4ed <FeedbackCell[one closure]>), 3 uses
     3: Constant(0x21ff0101e589 <JSFunction trigger (sfi = 0x21ff0101e451)>), 6 uses
     4: Constant(0x21ff0101e50d <ScriptContext[3]>), 6 uses
    46: Constant(0x21ff0104b819 <Object map = 0x21ff0101e5bd>), 1 uses
     5: RootConstant(undefined_value), 1 uses
    12: RootConstant(true_value), 0 uses 🪦
    28: RootConstant(false_value), 0 uses 🪦
    19: RootConstant(optimized_out), 0 uses 🪦
     8: SmiConstant(0), 2 uses
    22: SmiConstant(1), 1 uses
    37: SmiConstant(3), 1 uses
     9: SmiConstant(5), 1 uses
    43: SmiConstant(42), 1 uses
    10: Int32Constant(0), 3 uses, cannot truncate to int32
    16: Int32Constant(1), 1 uses, cannot truncate to int32
    39: Int32Constant(3), 2 uses, cannot truncate to int32
    11: Int32Constant(5), 2 uses, cannot truncate to int32
   Block b0
  0x21ff0101e451 <SharedFunctionInfo trigger> (0x21ff0104a989 <String[6]: "poc.js">:16:16)
     0 : 0c                LdaZero
     1: InitialValue(<this>), 6 uses
     2: InitialValue(a0), 8 uses
     6: FunctionEntryStackCheck
        ↳ lazy @-1 (3 live vars)
     7: Jump b1
     ↓
   Block b1
  0x21ff0101e451 <SharedFunctionInfo trigger> (0x21ff0104a989 <String[6]: "poc.js">:0:0)
    14 : 40 f9 01          Add r0, FBV[1]
        ↱ eager @14 (6 live vars)
    13: CheckedSmiUntag [n2], 2 uses, cannot truncate to int32
        ↱ eager @14 (6 live vars)
    14: Int32AddWithOverflow [n13, n10], 1 uses, can truncate to int32 [-2147483648, 2147483647]
    17 : 53 00 00          BitwiseOrSmi [0], FBV[0]
    15: Int32BitwiseOr [n14, n10], 2 uses, cannot truncate to int32
    26 : 95 16 00 03       JumpLoop [22], [0], FBV[3]
    18: ReduceInterruptBudgetForLoop(17) [n17]
        ↳ lazy @26 (5 live vars)
    21: Int32ToNumber[kCanonicalizeSmi] [n15], 1 uses
    20: Jump b2
     │  with gap moves:
     │    - n21 → 23: φᵀ r0
     │    - n22 → 24: φᵀ r2
     ▼
╭─►Block b2 peeled (effects:)
│   23: φᵀ r0 (n21, n35), 5 uses
│   24: φᵀ r2 (n22, n36), 2 uses
│    6 : 77 f7 01 00       TestLessThan r2, EmbeddedFeedback[0x1]
│       ↱ eager @6 (6 live vars)
│   25: CheckedSmiUntag [n24], 3 uses, cannot truncate to int32
│   26: Int32Compare[LessThan] [n25, n11], 0 uses 🪦
│   10 : a6 14             JumpIfFalse [20]
│╭──27: BranchIfInt32Compare(LessThan) [n25, n11] b3 b4
││   ↓
││ Block b3
││  14 : 40 f9 01          Add r0, FBV[1]
││      ↱ eager @6 (6 live vars)
││  29: CheckedSmiUntag [n23], 1 uses, cannot truncate to int32
││      ↱ eager @6 (6 live vars)
││  30: Int32AddWithOverflow [n13, n29], 1 uses, can truncate to int32 [-2147483648, 2147483647]
││  17 : 53 00 00          BitwiseOrSmi [0], FBV[0]
││  31: Int32BitwiseOr [n30, n10], 2 uses, cannot truncate to int32
││  23 : 59 02             Inc FBV[2]
││      ↱ eager @6 (6 live vars)
││  32: Int32IncrementWithOverflow [n25], 2 uses, cannot truncate to int32
││  26 : 95 16 00 03       JumpLoop [22], [0], FBV[3]
││  33: ReduceInterruptBudgetForLoop(17) [n17]
││      ↳ lazy @26 (5 live vars)
││  35: Int32ToNumber[kCanonicalizeSmi] [n31], 1 uses
││  36: Int32ToNumber[kCanonicalizeSmi] [n32], 1 uses
││      ↱ eager @6 (6 live vars)
╰─◄─34: JumpLoop b2
 │      with gap moves:
 │        - n35 → 23: φᵀ r0
 │        - n36 → 24: φᵀ r2
 │
 ╰►Block b4
    32 : 78 f9 01 00       TestGreaterThan r0, EmbeddedFeedback[0x1]
        ↱ eager @32 (5 live vars)
    38: CheckedSmiUntag [n23], 2 uses, cannot truncate to int32
    40: Int32Compare[GreaterThan] [n38, n39], 0 uses 🪦
    36 : a6 06             JumpIfFalse [6]
╭───41: BranchIfInt32Compare(GreaterThan) [n38, n39] b5 b6
│    ↓
│  Block b5
│   40 : 96 04             Jump [4]
│╭──42: Jump b7
││      with gap moves:
││        - n23 → 45: φᵀ <accumulator>
││
╰─►Block b6
 │  44 : d1                Star1
 │  44: Jump b7
 │   │  with gap moves:
 │   │    - n43 → 45: φᵀ <accumulator>
 │   ▼
 ╰►Block b7
    45: φᵀ <accumulator> (n23, n43), 1 uses
    52 : 39 f6 01 04       SetNamedProperty r3, [1:"x"], FBV[4]
    47: StoreTaggedFieldNoWriteBarrier(0xc: 0x21ff00003665 <String[1]: #x>) [n46, n45]
    57 : b7                Return
    48: ReduceInterruptBudgetForReturn(57) [n17]
    49: Return [n5]

Texto alterado

Abrir arquivo

----- After Phi untagging -----
Graph

17: Constant(0x21ff0101e4ed <FeedbackCell[one closure]>), 3 uses
     3: Constant(0x21ff0101e589 <JSFunction trigger (sfi = 0x21ff0101e451)>), 6 uses
     4: Constant(0x21ff0101e50d <ScriptContext[3]>), 6 uses
    46: Constant(0x21ff0104b819 <Object map = 0x21ff0101e5bd>), 1 uses
     5: RootConstant(undefined_value), 1 uses
    12: RootConstant(true_value), 0 uses 🪦
    28: RootConstant(false_value), 0 uses 🪦
    19: RootConstant(optimized_out), 0 uses 🪦
     8: SmiConstant(0), 2 uses
    22: SmiConstant(1), 0 uses 🪦
    37: SmiConstant(3), 1 uses
     9: SmiConstant(5), 1 uses
    43: SmiConstant(42), 1 uses
    10: Int32Constant(0), 1 uses, cannot truncate to int32
    16: Int32Constant(1), 2 uses, cannot truncate to int32
    39: Int32Constant(3), 2 uses, cannot truncate to int32
    11: Int32Constant(5), 2 uses, cannot truncate to int32
   Block b0
  0x21ff0101e451 <SharedFunctionInfo trigger> (0x21ff0104a989 <String[6]: "poc.js">:16:16)
     0 : 0c                LdaZero
     1: InitialValue(<this>), 6 uses
     2: InitialValue(a0), 8 uses
     6: FunctionEntryStackCheck
        ↳ lazy @-1 (3 live vars)
     7: Jump b1
     ↓
   Block b1
  0x21ff0101e451 <SharedFunctionInfo trigger> (0x21ff0104a989 <String[6]: "poc.js">:0:0)
    14 : 40 f9 01          Add r0, FBV[1]
        ↱ eager @14 (6 live vars)
    13: CheckedSmiUntag [n2], 2 uses, cannot truncate to int32
    14: Int32Add [n13, n10], 3 uses, can truncate to int32 [-2147483648, 2147483647]
    26 : 95 16 00 03       JumpLoop [22], [0], FBV[3]
    18: ReduceInterruptBudgetForLoop(17) [n17]
        ↳ lazy @26 (5 live vars)
    21: Int32ToNumber[kCanonicalizeSmi] [n14], 0 uses 🪦
    20: Jump b2
     │  with gap moves:
     │    - n14 → 23: φᴵ r0
     │    - n16 → 24: φᴵ r2
     ▼
╭─►Block b2 peeled (effects:)
│   23: φᴵ r0 (n14, n30), 8 uses
│   24: φᴵ r2 (n16, n32), 5 uses
│    6 : 77 f7 01 00       TestLessThan r2, EmbeddedFeedback[0x1]
│   26: Int32Compare[LessThan] [n24, n11], 0 uses 🪦
│   10 : a6 14             JumpIfFalse [20]
│╭──27: BranchIfInt32Compare(LessThan) [n24, n11] b3 b4
││   ↓
││ Block b3
││  14 : 40 f9 01          Add r0, FBV[1]
││  30: Int32Add [n13, n23], 3 uses, can truncate to int32 [-2147483648, 2147483647]
││  23 : 59 02             Inc FBV[2]
││      ↱ eager @6 (6 live vars)
││  32: Int32IncrementWithOverflow [n24], 3 uses, cannot truncate to int32
││  26 : 95 16 00 03       JumpLoop [22], [0], FBV[3]
││  33: ReduceInterruptBudgetForLoop(17) [n17]
││      ↳ lazy @26 (5 live vars)
││  35: Int32ToNumber[kCanonicalizeSmi] [n30], 0 uses 🪦
││  36: Int32ToNumber[kCanonicalizeSmi] [n32], 0 uses 🪦
││      ↱ eager @6 (6 live vars)
╰─◄─34: JumpLoop b2
 │      with gap moves:
 │        - n30 → 23: φᴵ r0
 │        - n32 → 24: φᴵ r2
 │
 ╰►Block b4
    32 : 78 f9 01 00       TestGreaterThan r0, EmbeddedFeedback[0x1]
    40: Int32Compare[GreaterThan] [n23, n39], 0 uses 🪦
    36 : a6 06             JumpIfFalse [6]
╭───41: BranchIfInt32Compare(GreaterThan) [n23, n39] b5 b6
│    ↓
│  Block b5
│   50: Int32ToNumber[kCanonicalizeSmi] [n23], 1 uses
│   40 : 96 04             Jump [4]
│╭──42: Jump b7
││      with gap moves:
││        - n50 → 45: φᵀ <accumulator>
││
╰─►Block b6
 │  44 : d1                Star1
 │  44: Jump b7
 │   │  with gap moves:
 │   │    - n43 → 45: φᵀ <accumulator>
 │   ▼
 ╰►Block b7
    45: φᵀ <accumulator> (n50, n43), 1 uses
    52 : 39 f6 01 04       SetNamedProperty r3, [1:"x"], FBV[4]
    47: StoreTaggedFieldNoWriteBarrier(0xc: 0x21ff00003665 <String[1]: #x>) [n46, n45]
    57 : b7                Return
    48: ReduceInterruptBudgetForReturn(57) [n17]
    49: Return [n5]