During boot the kernel is loaded into memory and also in-memory filesystems like /proc or /sys are created. How can you change values in those filesystems? Or how could you change the dmesg output, for instance by removing or adding lines? There are some protections in place to prevent writing to kernel memory due to security reasons. Can those be disabled? Ideally nothing should need to run on the system running the kernel itself. Can DMA be used to write kernel memory? Are there other options?
closed as unclear what you're asking by G-Man, Stephen Harris, Rui F Ribeiro, Thomas, Jeff Schaller♦ Jan 19 at 13:37
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