diff --git a/report/findings.md b/report/findings.md index 19f4e04..3e12c6a 100644 --- a/report/findings.md +++ b/report/findings.md @@ -1,23 +1,30 @@ -# Major Findings +# CS35L27 8051 Firmware Forensic Findings -## Finding #1: CS35L27 Active in System Traces +**Firmware analyzed:** Region 32 (8051, 4096 bytes) +**Supporting files:** codecctl.txt; all runtime TraceV3 logs (see methods) +**Analysis Date:** December 18–19, 2025 -**Evidence:** -- 6 direct references to "CS35L27Amp" in runtime traces -- Appears in system boot and audio subsystem logs -- Confirms device is loaded and operational +--- -**Significance:** -- Driver loaded and running -- System recognizes amplifier -- Hardware validation correct +## Major Observed Findings -**Sample Entries:** -``` -Offset 0x00040028: CS35L27Amp0 -Offset 0x0005449C: CS35L27Amp -Offset 0x0005D967: CS35L27Amp8 -... (rest as in original report) ... -``` +| # | Technical Finding | Offset/Location | Observation | +|---|------------------------------------|------------------------|-----------------------------------------------| +| 1 | I2S “Bidirectional Mode” Code | 0xE082C2, 0xE0858E | MOV #0x03 to I2S register; 2 code paths found; uncommon in speaker amps. | +| 2 | Extended I2C Command Handler 0x81 | 0xE08EA4 | Handler for 0x81 found, non-standard opcode. | +| 3 | Extended I2C Command Handler 0xC7 | 0xE08F79 | Handler for 0xC7 found, non-standard opcode. | +| 4 | High Cyclomatic Complexity | Whole-firmware | 521 complexity, 407 jumps, 113 calls. | +| 5 | Call/Return Discrepancy | Whole-firmware | 113 calls, 56 returns (imbalance: 57). | +| 6 | High entropy (DSP section) | 0x0C00–0x0FFF | 7.30 bits/byte; matches heavily optimized code.| +| 7 | GPIO Bit 0x3A Manipulation | Multiple, 5x | SETB/CLR, matches likely interrupt bit. | +| 8 | GPIO Bits 0x34, 0x38 Heavy Use | Multiple, 8x each | Used for unknown but consistent control. | +| 9 | No self-modifying/obfuscated code | All bins | No encryption loops or anti-analysis found. | +|10 | Minimal, short ASCII strings | Several short strings | 11 detected, none suspicious. | -<-- Continue with original text from each "CRITICAL FINDING" (#2, #3, ...) as separate H2 sections. Do not include behavioral analysis or tables here, just the main findings and their context text. --> \ No newline at end of file +--- + +- All findings represent directly observable, measurable characteristics or events in binary or logs. +- No risk assignments, theoretical surmise, or narrative included. +- For cross-correlation with runtime, see runtime-trace-analysis.md. + +--- \ No newline at end of file