• Dave Young's avatar
    x86: Export x86 boot_params to sysfs · 5039e316
    Dave Young authored
    kexec-tools use boot_params for getting the 1st kernel hardware_subarch,
    the kexec kernel EFI runtime support also needs to read the old efi_info
    from boot_params. Currently it exists in debugfs which is not a good
    place for such infomation. Per HPA, we should avoid "sploit debugfs".
    
    In this patch /sys/kernel/boot_params are exported, also the setup_data is
    exported as a subdirectory. kexec-tools is using debugfs for hardware_subarch
    for a long time now so we're not removing it yet.
    
    Structure is like below:
    
    /sys/kernel/boot_params
    |__ data                /* boot_params in binary*/
    |__ setup_data
    |   |__ 0               /* the first setup_data node */
    |   |   |__ data        /* setup_data node 0 in binary*/
    |   |   |__ type        /* setup_data type of setup_data node 0, hex string */
    [snip]
    |__ version             /* boot protocal version (in hex, "0x" prefixed)*/
    Signed-off-by: default avatarDave Young <dyoung@redhat.com>
    Acked-by: default avatarBorislav Petkov <bp@suse.de>
    Tested-by: default avatarToshi Kani <toshi.kani@hp.com>
    Signed-off-by: default avatarMatt Fleming <matt.fleming@intel.com>
    5039e316
Makefile 3.99 KB