On 06/13/14 at 09:50am, Borislav Petkov wrote: > On Mon, Jun 09, 2014 at 11:41:37AM -0400, Vivek Goyal wrote: > > IIUC, COMMAND_LINE_SIZE gives max limits of running kernel and it does > > not tell us anything about command line size supported by kernel being > > loaded. > > Whatever you do, you do need a sane default because even querying the > boot protocol is not reliable as the to-be-loaded kernel's boot protocol > might be manipulated too, before signing (who knows what people do > in the wild). Make sense. > > So having a sane, unconditional fallback COMMAND_LINE_SIZE from the > first kernel is a must, methinks. By greping for COMMAND_LINE_SIZE for different arch, I think 8K being the fallback, in general, is good for now and the future: alpha/include/uapi/asm/setup.h 4:#define COMMAND_LINE_SIZE 256 arm/include/uapi/asm/setup.h 19:#define COMMAND_LINE_SIZE 1024 avr32/include/uapi/asm/setup.h 14:#define COMMAND_LINE_SIZE 256 cris/include/uapi/asm/setup.h 4:#define COMMAND_LINE_SIZE 256 frv/include/uapi/asm/setup.h 15:#define COMMAND_LINE_SIZE 512 ia64/include/uapi/asm/setup.h 4:#define COMMAND_LINE_SIZE 2048 m32r/include/uapi/asm/setup.h 8:#define COMMAND_LINE_SIZE 512 m68k/include/uapi/asm/setup.h 14:#define COMMAND_LINE_SIZE 256 mips/include/uapi/asm/setup.h 4:#define COMMAND_LINE_SIZE 4096 parisc/include/uapi/asm/setup.h 4:#define COMMAND_LINE_SIZE 1024 powerpc/include/uapi/asm/setup.h 4:#define COMMAND_LINE_SIZE 2048 s390/include/uapi/asm/setup.h 9:#define COMMAND_LINE_SIZE 4096 um/include/asm/setup.h 8:#define COMMAND_LINE_SIZE 4096 x86/include/asm/setup.h 6:#define COMMAND_LINE_SIZE 2048 xtensa/include/uapi/asm/setup.h 14:#define COMMAND_LINE_SIZE 256 c6x/include/uapi/asm/setup.h 4:#define COMMAND_LINE_SIZE 1024 microblaze/include/uapi/asm/setup.h 14:#define COMMAND_LINE_SIZE 256 mn10300/include/uapi/asm/param.h 16:#define COMMAND_LINE_SIZE 256 score/include/uapi/asm/setup.h 4:#define COMMAND_LINE_SIZE 256 tile/include/uapi/asm/setup.h 18:#define COMMAND_LINE_SIZE 2048 arc/include/asm/setup.h 15:#define COMMAND_LINE_SIZE 256 arm64/include/uapi/asm/setup.h 24:#define COMMAND_LINE_SIZE 2048
