DF-2387 / leak_sample.txt
# DF-2387 leak samples -- unprivileged (maxx, uid 1001) sysctl reads # values are int32 prints of Elements[index].Integer.Value (UINT64->UINT32) # baseline kernel #4 (verbatim driver), 2026-10-19 ## canary attribution (sinf_mode=1: Package.Count=2, 9-element backing, ## elements past Count hold per-index canary 0xC2/0xC3/0xC4/0xC8 pattern) reg2_max: -1027423550 == 0xC2C2C2C2 (index 2, lcd_brightness_max) reg3_min: -1010580541 == 0xC3C3C3C3 (index 3, lcd_brightness_min) reg4_brt: -993737532 == 0xC4C4C4C4 (index 4, lcd_brightness) reg8_mute: -926365496 == 0xC8C8C8C8 (index 8, sound_mute) (run.log, single boot; identical values on the earlier boot of the same kernel) ## tight + same-zone spray (sinf_mode=3: 72-byte package allocation, ## six 0xEE-marked same-size chunks allocated directly behind it) spray1 reg4_brt=-286331154 reg8_mute=-286331154 spray2 reg4_brt=-286331154 reg8_mute=-286331154 spray3 reg4_brt=-286331154 reg8_mute=-286331154 spray4 reg4_brt=-286331154 reg8_mute=-286331154 spray5 reg4_brt=-286331154 reg8_mute=-286331154 # -286331154 == 0xEEEEEEEE: reads at package+120 (reg4) and package+216 # (reg8) land 48+ bytes past the 72-byte chunk in the marked neighbor # chunks -- cross-chunk kernel heap read disclosed to an unprivileged user. ## tight without grooming (sinf_mode=2): adjacent chunks were zeroed slab tight1..tight5 reg4_brt=0 reg8_mute=0 ## control (sinf_mode=4, 9-element package): 255 / 0 / 128 / 0 ## fixed kernel #6: every short-package read returns -1 (15/15 across modes)