I am a big fan of Java’s MappedByteBuffers for situations like this. It is blazing fast. Below is a snippet I put together for you that maps a buffer to the file, seeks to the middle, and then searches backwards to a newline character. This should be enough to get you going? I have similar … Read more
On modern Linux systems, the linker will mark stack/data non-executable IFF all objects that participate in the link have a special “marker” section .note.GNU-stack. If you compile e.g. int foo() { return 1; } into assembly (with gcc -S foo.c), you’ll see this: .section .note.GNU-stack,””,@progbits For nasm, the syntax is shown in section 8.9.2 of … Read more
busybox devmem busybox devmem is a tiny CLI utility that mmaps /dev/mem. You can get it in Ubuntu with: sudo apt-get install busybox Usage: read 4 bytes from the physical address 0x12345678: sudo busybox devmem 0x12345678 Write 0x9abcdef0 to that address: sudo busybox devmem 0x12345678 w 0x9abcdef0 Source: https://github.com/mirror/busybox/blob/1_27_2/miscutils/devmem.c#L85 mmap MAP_SHARED When mmapping /dev/mem, you … Read more