DF-4704 / verdict.json
{ "finding_id": "DF-4704", "poc_id": "DF-4704", "status": "untested", "reproduced": 0, "impact": "Kernel page faults / adjacent-memory corruption on the first console clear at 8bpp KMS console (4-byte writes on a 1-byte stride); root/boot-config gated", "confidence": "likely", "attempts": 0, "guest_uname": null, "code_hash": null, "exploit_chain": [], "evidence": "get_pixel_size integer-divides depth/8: depths 8..15 return 1 while the blit/fill dispatch falls through to the 32-bit ops (writel 4 bytes/px) - each text row overruns its scanline by 3*width bytes and the last rows write past the fb mapping. fill_rect16/32 verified correct (no DF-1818 twin); the known 24-bit slow-path is the only other stride defect. Switch-return-0 + refuse-to-draw fix.", "kernel_refs": [ "sys/dev/misc/syscons/sckmsrndr.c:138", "sys/dev/misc/syscons/sckmsrndr.c:142", "sys/dev/misc/syscons/sckmsrndr.c:389", "sys/dev/misc/syscons/sckmsrndr.c:482" ], "verdict": "not_run: boot-flag gated (video=...@8) and no drm KMS console on the QEMU guest; arithmetic source-certain", "fix_status": "not_testable", "fix_baseline_reproduced": 0, "fix_patched_reproduced": 0, "fix_verdict": "not_testable: hardware/boot-flag gated", "fix_evidence": "fix in finding markdown" } |