Missing caps_priv_check on destructive ATA ioctls (IOCATADETACH/ATTACH/REINIT/REQUEST)
Summary
ata-all.c:369 ata_ioctl handles IOCATAATTACH/DETACH/REINIT (392/400/384) NO caps_priv_check. 450 ata_device_ioctl handles IOCATAREQUEST (461) raw ATA/ATAPI passthrough NO priv check. Sibling atapi-cd.c:360 DOES gate CDIOCRESET with caps_priv_check(SYSCAP_RESTRICTEDROOT). /dev/ata mode 0600 root:operator -> operator group can IOCATADETACH (panic/corruption) or IOCATAREQUEST raw ATA_WRITE_DMA to any sector bypassing GEOM/FS perms. Fix: caps_priv_check SYSCAP_RESTRICTEDROOT on destructive + passthrough ioctls.
Discussion (0)
PoC verification
Evidence pack
findings/poc/DF-1643 · 4 files| File | Type | Description | Size | |
|---|---|---|---|---|
| fix.diff | suggested-fix | git-apply-able fix for the cited bug | 720 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 |
DF-1643 VERDICT
Verdict: REPRODUCED (source-confirmed)
Impact: Low (driver-level NULL deref / OOB / leak / DoS — hardware-gated)
Mechanism: ata-all.c:369 ata_ioctl handles IOCATAATTACH/DETACH/REINIT (392/400/384) NO caps_priv_check. 450 ata_device_ioctl handles IOCATAREQUEST (461) raw ATA/ATAPI passthrough NO priv check. Sibling atapi-cd.
Citation: sys/dev/disk/nata/ata-all.c:369-461
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
fixedfix.diff compiled in batch kernel build rc=0 -Werror
fix.diff compiled in batch kernel build rc=0 -Werror
Confirmed kernel references
—
Detail
Exploit chain
none (Low severity)
Evidence (decisive lines)
Source-confirmed: missing caps_priv_check on destructive IOCATAATTACH/DETACH/REINIT (ata-all.c:369-461)
Verified recommended fix
Source-confirmed: missing caps_priv_check on destructive IOCATAATTACH/DETACH/REINIT (ata-all.c:369-461)
Verdict
Source-confirmed: missing caps_priv_check on destructive IOCATAATTACH/DETACH/REINIT (ata-all.c:369-461)
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