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Low 45 Bitcoin

review data flow

Public commit record

What the developer wrote

Authored by ww3512687

28/100 · Opaque
review data flow
✓ Subject identifies a change! No meaningful explanatory body
The short version

What changed, and why it matters

This commit is a cleanup and hardening pass on how the Keystone 3 hardware wallet handles camera images, SD card files, and debug/test code. The most user-relevant change is that file-reading functions now refuse to load very large files from the SD card, which closes a path where an oversized file could exhaust device memory. Several debug helpers that could print sensitive file contents or cryptographic hashes over the serial port, plus a leftover firmware-copy routine, are removed. A camera preview buffer is also made safer by freeing it on re-init instead of leaking memory. The commit message is vague ('review data flow') and does not call this a security fix, so the security relevance is inferred from the code changes rather than stated by the vendor.

Recommended action

Treat this as a defensive hardening commit rather than an active vulnerability fix. Review whether MAX_FILE_CONTENT_LEN (1 MB) is appropriate for all legitimate use cases, ensure callers free the buffers returned by FatfsFileRead() and FatfsFileReadBytes(), and confirm that removal of the debug/test commands does not break required manufacturing or support workflows. Consider whether the removed functions existed in released firmware and whether any advisory is warranted for users on older builds.

Security signals we found

01

Removal of debug functions that printed full file contents or MD5/SHA256 over serial (information disclosure reduction)

02

Addition of MAX_FILE_CONTENT_LEN size check before reading SD card files (DoS / memory-exhaustion mitigation)

03

Removal of global g_fileContent buffer in favor of locally allocated, bounded buffers (use-after-free / memory hygiene improvement)

04

QR preview image buffer now freed on re-initialization (memory leak fix)

05

Removal of CopyToFlash() and related UART command (firmware-update attack surface reduction)

06

Removal of unused FileExists() and conversion of FileWrite() to stack buffer (minor cleanup)

07

Removal of PSBT hex debug print from multisig SD-card flow (sensitive data no longer logged)

Risk score

Why this scored 45/100

Our methodology →
Potential impact 12/30
Exploitability 8/25
Stealth signal 6/15
Affected reach 10/15
Confidence 6/10
Evidence quality 3/5
Human-validated context

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