tree d1fdec76b8b8362c68d24ea1e131fe7be3834247
parent 90d740d1f35643808ad305481bba704d1d17954c
author Yinghai Lu <yinghai@kernel.org> 1426662040 -0700
committer Yinghai Lu <yinghai@kernel.org> 1426662040 -0700

x86, kaslr: Allow random address could be below loaded address

Now new output buffer is always after current one.

With correct tracking in mem_avoid, we can buffer below that.

That would make sure when bootloader like patched grub2 or kexec
have put output rather near the end of ram, we still can get
random base below output.

Now just pick 512M as min_addr.

with this patch, will get:

early console in decompress_kernel
decompress_kernel:
  input: [0x13e9ee3b4-0x13f36b9df], output: [0x13c000000-0x13f394fff], heap: [0x13f376ac0-0x13f37eabf]
boot via startup_64
KASLR using RDTSC...
KASLR using RDTSC...
                     new output: [0x6f000000-0x72394fff]

Decompressing Linux... xz... Parsing ELF... Performing relocations... done.
Booting the kernel.
[    0.000000] bootconsole [uart0] enabled
[    0.000000] Kernel Layout:
[    0.000000]   .text: [0x6f000000-0x70096a9c]
[    0.000000] .rodata: [0x70200000-0x70a4efff]
[    0.000000]   .data: [0x70c00000-0x70e4e9bf]
[    0.000000]   .init: [0x70e50000-0x7120bfff]
[    0.000000]    .bss: [0x71219000-0x7234efff]
[    0.000000]    .brk: [0x7234f000-0x72374fff]

Signed-off-by: Yinghai Lu <yinghai@kernel.org>