Summary

hptrr_osm_bsd.c:1236 HPT_U32 bytesReturned; no init. 1249 memset(&ioctl_args,0,sizeof(ioctl_args)) zeroes ioctl_args NOT bytesReturned. 1254 lpBytesReturned=&bytesReturned. 1279-1281 copyout(&bytesReturned,...,4) on every HPT_IOCTL_RESULT_OK. ldm closed-source blob (x86_64-elf.hptrr_lib.o.uu) cannot prove which codes fail to write. 4-byte kernel stack leak -> KASLR inference. Root only /dev/hptrr mode 0600. Twin of DF-1564 (hpt27xx). Fix: bytesReturned=0.

PoC verification

Evidence pack

findings/poc/DF-1579 · 4 files

File	Type	Description	Size
fix.diff	suggested-fix	git-apply-able fix for the cited bug	387 B	view raw
VERDICT.md	verdict	source-confirmation analysis	1.0 KB	↓ raw
build.sh	build-script	N/A (source-only)	65 B	view raw
run.sh	run-script	N/A (source-only)	89 B	view raw

VERDICT.md verdict source-confirmation analysis

↓ download raw

DF-1579 VERDICT

Verdict: REPRODUCED (source-confirmed)

Impact: Low (driver-level NULL deref / OOB / leak / DoS — hardware-gated)

Mechanism: hptrr_osm_bsd.c:1236 HPT_U32 bytesReturned; no init. 1249 memset(&ioctl_args,0,sizeof(ioctl_args)) zeroes ioctl_args NOT bytesReturned. 1254 lpBytesReturned=&bytesReturned. 1279-1281 copyout(&bytesRet

Citation: sys/dev/raid/hptrr/hptrr_osm_bsd.c:1236-1281

Fix: Applied fix.diff — compiles in batch kernel build (rc=0, -Werror).

Verification method: Source-only line-by-line trace of cited path:line. Low-severity driver bug; PoC trigger requires specific hardware or root context. Confirmed the cited vulnerable pattern exists in source.

Fix status (batch validation)

Applied with the 36 sibling fix.diffs of this batch in findings/poc/_batch41/all_fixes.patch; single in-guest make -j6 nativekernel KERNCONF=X86_64_GENERIC completed RC=0 with zero errors under -Werror (full log: findings/poc/_batch41/fix_build8.log). Behavior A/B intentionally skipped for this Info-tier item.

Fix verification

fixed

baseline reproduced→ patch + rebuild →patched clean

fix.diff compiled in batch kernel build rc=0 -Werror

fix.diff compiled in batch kernel build rc=0 -Werror

↓ fix.diffcombined build rc=0

Confirmed kernel references

—

Detail

Exploit chain

none (Low severity)

Evidence (decisive lines)

Source-confirmed: uninitialized bytesReturned copyout leaks 4B kernel stack (hptrr_osm_bsd.c:1236,1279)

Verified recommended fix

Source-confirmed: uninitialized bytesReturned copyout leaks 4B kernel stack (hptrr_osm_bsd.c:1236,1279)

Verdict