https://munzzyy.github.io/ Embedded and firmware security: kernel drivers, device firmware, and the RF/SDR stack around them. Build log: what broke, what I tried, what review caught. en-us Sat, 29 Aug 2026 00:00:00 GMT https://munzzyy.github.io/posts/u-boot-spi-no-wire.html https://munzzyy.github.io/posts/u-boot-spi-no-wire.html Sat, 29 Aug 2026 00:00:00 GMT A U-Boot binding allowed a bus width of zero and nothing downstream understood what that meant. Two patches later, mainline does. https://munzzyy.github.io/posts/gnu-cpio-overread.html https://munzzyy.github.io/posts/gnu-cpio-overread.html Sat, 29 Aug 2026 00:00:00 GMT A patch got rejected on a correct POSIX argument, which turned out not to be the argument that mattered. Reframing it around malformed input is what got it fixed. https://munzzyy.github.io/posts/u-boot-never-had-a-btrfs-test.html https://munzzyy.github.io/posts/u-boot-never-had-a-btrfs-test.html Mon, 10 Aug 2026 00:00:00 GMT Writing the filesystem tests U-Boot was missing: a reproducer that had to be synthesized byte by byte, a regression the suite caught, and three patches now in mainline. https://munzzyy.github.io/posts/two-kernel-patches-for-the-flipper-one.html https://munzzyy.github.io/posts/two-kernel-patches-for-the-flipper-one.html Mon, 10 Aug 2026 00:00:00 GMT A devicetree VBUS fix where my first read was wrong, and a dwc3 gadget fix whose answer had been sitting on the mailing list since 2022.