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Matt Gleason

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53 commits1 monitored projects13 candidates3 high-risk analyses
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High 70 AI analysisMessage 50 · Thin
FD FoundationPassport firmware BitcoinHardware wallets

SFT-7133: fixed dangerous change check on all taproot inputs

This firmware update fixes a bug in how Passport checks whether a Bitcoin transaction's 'change' output is safe to send back to the user's own wallet. For modern Taproot-style transactions, the device was skipping an important ownership ch…

dangerous change check bypass on Taproot inputsmissing validation path for tap_subpathsPSBT input ownership verification gap
46efe834by Matt Gleason+1−11 file
No security note in commit
Low 47 AI analysisMessage 50 · Thin
FD FoundationPassport firmware BitcoinHardware wallets

SFT-6378: removed more branching from mnemonic decode process

This commit tweaks the code that converts a user's BIP39 recovery phrase (mnemonic words) into secret bits inside a hardware wallet. The change removes an 'if' branch during word copying so the loop always writes to the same positions, reg…

Branchless, constant-time-style copy of sensitive input wordsMasking of post-delimiter bytes to zero to avoid information leakage via memory access patternsRemoval of conditional stores that depended on word length
d0edb18aby Matt Gleason+13−71 file
Vendor flagged security relevance
Informational 15 AI analysisMessage 45 · Thin
FD FoundationPassport firmware BitcoinHardware wallets

SFT-6378: refined more comments

This commit only rewrites two code comments in a BIP39 mnemonic parser to be shorter and clearer. It does not change any executable code, logic, or behavior. There is no security-relevant change.

e58baa89by Matt Gleason+2−31 file
No security note in commit
Informational 15 AI analysisMessage 35 · Opaque
FD FoundationPassport firmware BitcoinHardware wallets

SFT-6378: improved comments

This commit only rewrites comments in a source file that handles BIP39 seed phrases. No code logic, buffer sizes, or function behavior were changed. It is a documentation-only cleanup and does not affect security.

42cad0d8by Matt Gleason+9−31 file
No security note in commit
Moderate 63 AI analysisMessage 60 · Adequate
FD FoundationPassport firmware BitcoinHardware wallets

SFT-6378: responded to more feedback, needs testing and evaluation

This commit hardens the code that converts a user's BIP39 recovery phrase (seed words) into secret bits. It fixes a bug where 8-character words were wrongly rejected, makes the loop length independent of the number of words to reduce timin…

Timing-side-channel mitigation: outer loop iteration count made independent of mnemonic word countOut-of-bounds read prevention: inner loop index bounded against sizeof(padded)-1Off-by-one fix: inner loop bound changed from BIP39_MAX_WORD_LEN-1 to BIP39_MAX_WORD_LEN
42f95ed8by Matt Gleason+25−181 file
No security note in commit
Moderate 59 AI analysisMessage 50 · Thin
FD FoundationPassport firmware BitcoinHardware wallets

SFT-6378: made more parts of mnemonic parsing and fetching constant time

This commit hardens the code that converts a user's BIP-39 seed phrase into secret data. It removes timing and loop-behavior clues that an attacker with physical access might measure to learn how many words the phrase has, how long each wo…

Constant-time / secret-independent control-flow hardeningRemoval of input-length-dependent loops in mnemonic parsingRemoval of early returns on invalid word length
5a0cc5edby Matt Gleason+52−183 files
Vendor flagged security relevance
Low 49 AI analysisMessage 75 · Adequate
FD FoundationPassport firmware BitcoinHardware wallets

SFT-6378: first pass at anti-sidechannel round 2, needs testing and evaluation

This commit is a defensive hardening change for the BIP-39 seed-word handling code in the Passport hardware wallet firmware. It restructures how the English word list is stored so that a constant-time word comparison function can safely re…

Constant-time/side-channel hardeningFixed-width wordlist storage to avoid out-of-bounds reads in constant-time comparisonRemoval of unreliable wall-clock timing assertions from CI tests
2c7dc29fby Matt Gleason+22−224 files
No security note in commit
Informational 18 AI analysisMessage 65 · Adequate
FD FoundationPassport firmware BitcoinHardware wallets

SFT-6948: fixed add-secrets portability, removed unnecessary error walling

This is a small build-tool fix in the factory/secrets-injection utility used during Passport device manufacturing. It replaces a non-portable type name (`ulong`) with the standard C type (`unsigned long`) and removes a compiler flag that w…

Type portability fix in a secrets-injection build toolRemoval of a compiler warning suppression that masked a type errorNo change to runtime logic, buffer size, or secret handling observed
7a55a01eby Matt Gleason+1−22 files
No security note in commit
Informational 19 AI analysisMessage 50 · Thin
FD FoundationPassport firmware BitcoinHardware wallets

SFT-3834: fixed return type for quitting message signing

This commit fixes a minor return-value bug in the Passport hardware wallet's health-check flow. When the user cancels message signing, the flow now returns 'None' instead of 'False'. This is a correctness fix that likely prevents a downstr…

Return-type correction in user-cancellation path of signing flowPotential semantic confusion between 'cancelled' and 'failed' health check result
3f29f056by Matt Gleason+2−21 file
No security note in commit
Informational 15 AI analysisMessage 50 · Thin
FD FoundationPassport firmware BitcoinHardware wallets

SFT-3834: formatted code, added autopep8 to nix devshell

This commit is purely cosmetic: it reformats Python code to follow style rules, fixes spacing around '@classmethod' decorators, and adds an auto-formatting tool (autopep8) to the developer environment. No program behavior or security prope…

e77f08d3by Matt Gleason+11−53 files
No security note in commit
Moderate 59 AI analysisMessage 50 · Thin
FD FoundationPassport firmware BitcoinHardware wallets

SFT-3834: ensured preview address matches the signed output address

This firmware update fixes a bug where the Bitcoin address shown on the Passport hardware wallet screen before signing could differ from the address actually used to create the signature. The fix makes the signing task verify that the addr…

Address mismatch check added between previewed and signed addressesSeparation of display-formatted address from canonical address used for signingRefactoring to consolidate signing logic through HealthCheckCommonFlow
434d4bccby Matt Gleason+19−463 files
No security note in commit
Informational 11 AI analysisMessage 65 · Adequate
FD FoundationPassport firmware BitcoinHardware wallets

SFT-6948: removed unnecessary add-secrets build inputs and inherited items

This commit removes unused build dependencies from a Nix build script that adds secrets to Passport firmware. The change drops references to pkg-config and OpenSSL that were apparently not actually needed. There is no direct evidence this …

Reduction of build dependencies can be considered a minor supply-chain/attack-surface hardening measure, but no explicit security claim is made.No memory safety, cryptographic, authentication, or authorization changes are visible.
9c1e3654by Matt Gleason+2−42 files
No security note in commit
Informational 15 AI analysisMessage 45 · Thin
FD FoundationPassport firmware BitcoinHardware wallets

SFT-6948: added "add-secrets" to devshell

This commit adds a developer-only build helper called 'add-secrets' to the project's Nix development shell. It does not change the firmware that runs on user devices, nor does it alter how secrets are generated, stored, or protected in pro…

f4f7b4caby Matt Gleason+32−02 files
No security note in commit
Informational 15 AI analysisMessage 28 · Opaque
FD FoundationPassport firmware BitcoinHardware wallets

SFT-3834: fixed lint

This commit removes one blank line to satisfy a code linter. It does not change any executable code, logic, or behavior of the Passport firmware.

54098dfdby Matt Gleason+0−11 file
No security note in commit
Low 34 AI analysisMessage 75 · Adequate
FD FoundationPassport firmware BitcoinHardware wallets

SFT-3834: added verify step for microsd message signing, fixed export format for sparrow parsing

This firmware update fixes two issues in the Passport hardware wallet's message-signing feature. First, it adds a user confirmation screen when signing a message from a microSD card in normal (non-health-check) mode, so the user can see th…

Missing user confirmation before signing from microSD in normal modeAddress not shown to user prior to signature productionExported signed-message format used mismatched/ambiguous delimiters
18e80883by Matt Gleason+41−22 files
No security note in commit
Informational 15 AI analysisMessage 50 · Thin
FD FoundationPassport firmware BitcoinHardware wallets

fixed reuse errors caused by version bump, converted dep5 to toml

This commit is a housekeeping change. It removes an old license metadata file (.reuse/dep5) and replaces it with a newer TOML-format file (REUSE.toml). It also updates a build helper script (Justfile) to remove a now-unnecessary command-li…

2b30715bby Matt Gleason+71−1123 files
No security note in commit
Low 42 AI analysisMessage 45 · Thin
FD FoundationPassport firmware BitcoinHardware wallets

SFT-5689: improved path mismatch logic

This commit tightens how Passport checks that all inputs in a Bitcoin transaction belong to the same wallet account. Previously, the firmware only compared a partial derivation path prefix, which could have allowed mixing inputs from diffe…

Input validation change in PSBT signing pathNew explicit purpose-field check for BIP-44/49/84/86 derivation pathsDefensive tightening of 'super-account' path-mismatch logic
b8ff1071by Matt Gleason+14−21 file
No security note in commit
Low 42 AI analysisMessage 65 · Adequate
FD FoundationPassport firmware BitcoinHardware wallets

SFT-5689: prevented suspicious change alert for transactions from super-accounts

This firmware update changes how Passport checks whether a Bitcoin transaction's change output looks suspicious. The device previously compared the full beginning portion of the derivation path, which caused false alarms when a user combin…

Relaxation of change-output path-prefix validationExplicit handling of multi-purpose 'super-account' walletsWarning message still displays the full original prefix for user visibility
4c76b7c8by Matt Gleason+7−31 file
No security note in commit
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