1. 30 Apr, 2014 2 commits
  2. 16 Apr, 2014 1 commit
  3. 09 Apr, 2014 2 commits
  4. 08 Apr, 2014 3 commits
  5. 07 Apr, 2014 1 commit
  6. 03 Apr, 2014 23 commits
  7. 29 Mar, 2014 2 commits
  8. 17 Mar, 2014 2 commits
    • Rusty Russell's avatar
      kallsyms: fix percpu vars on x86-64 with relocation. · c6bda7c9
      Rusty Russell authored
      x86-64 has a problem: per-cpu variables are actually represented by
      their absolute offsets within the per-cpu area, but the symbols are
      not emitted as absolute.  Thus kallsyms naively creates them as offsets
      from _text, meaning their values change if the kernel is relocated
      (especially noticeable with CONFIG_RANDOMIZE_BASE):
      
       $ egrep ' (gdt_|_(stext|_per_cpu_))' /root/kallsyms.nokaslr
       0000000000000000 D __per_cpu_start
       0000000000004000 D gdt_page
       0000000000014280 D __per_cpu_end
       ffffffff810001c8 T _stext
       ffffffff81ee53c0 D __per_cpu_offset
       $ egrep ' (gdt_|_(stext|_per_cpu_))' /root/kallsyms.kaslr1
       000000001f200000 D __per_cpu_start
       000000001f204000 D gdt_page
       000000001f214280 D __per_cpu_end
       ffffffffa02001c8 T _stext
       ffffffffa10e53c0 D __per_cpu_offset
      
      Making them absolute symbols is the Right Thing, but requires fixes to
      the relocs tool.  So for the moment, we add a --absolute-percpu option
      which makes them absolute from a kallsyms perspective:
      
       $ egrep ' (gdt_|_(stext|_per_cpu_))' /proc/kallsyms # no KASLR
       0000000000000000 A __per_cpu_start
       000000000000a000 A gdt_page
       0000000000013040 A __per_cpu_end
       ffffffff802001c8 T _stext
       ffffffff8099b180 D __per_cpu_offset
       ffffffff809a3000 D __per_cpu_load
       $ egrep ' (gdt_|_(stext|_per_cpu_))' /proc/kallsyms # With KASLR
       0000000000000000 A __per_cpu_start
       000000000000a000 A gdt_page
       0000000000013040 A __per_cpu_end
       ffffffff89c001c8 T _stext
       ffffffff8a39d180 D __per_cpu_offset
       ffffffff8a3a5000 D __per_cpu_load
      Based-on-the-original-screenplay-by: default avatarAndy Honig <ahonig@google.com>
      Signed-off-by: default avatarRusty Russell <rusty@rustcorp.com.au>
      Acked-by: default avatarKees Cook <keescook@chromium.org>
      c6bda7c9
    • Kees Cook's avatar
      kallsyms: generalize address range checking · 78eb7159
      Kees Cook authored
      This refactors the address range checks to be generalized instead of
      specific to text range checks, in preparation for other range checks.
      Also extracts logic for "is the symbol absolute" into a function.
      Signed-off-by: default avatarKees Cook <keescook@chromium.org>
      Signed-off-by: default avatarRusty Russell <rusty@rustcorp.com.au>
      78eb7159
  9. 14 Mar, 2014 1 commit
  10. 13 Mar, 2014 1 commit
  11. 11 Mar, 2014 1 commit
  12. 04 Mar, 2014 1 commit
    • Andy Honig's avatar
      kallsyms: fix absolute addresses for kASLR · 0f55159d
      Andy Honig authored
      Currently symbols that are absolute addresses are incorrectly displayed
      in /proc/kallsyms if the kernel is loaded with kASLR.
      
      The problem was that the scripts/kallsyms.c file which generates the
      array of symbol names and addresses uses an relocatable value for all
      symbols, even absolute symbols.  This patch fixes that.
      
      Several kallsyms output in different boot states for comparison:
      
        $ egrep '_(stext|_per_cpu_(start|end))' /root/kallsyms.nokaslr
        0000000000000000 D __per_cpu_start
        0000000000014280 D __per_cpu_end
        ffffffff810001c8 T _stext
        $ egrep '_(stext|_per_cpu_(start|end))' /root/kallsyms.kaslr1
        000000001f200000 D __per_cpu_start
        000000001f214280 D __per_cpu_end
        ffffffffa02001c8 T _stext
        $ egrep '_(stext|_per_cpu_(start|end))' /root/kallsyms.kaslr2
        000000000d400000 D __per_cpu_start
        000000000d414280 D __per_cpu_end
        ffffffff8e4001c8 T _stext
        $ egrep '_(stext|_per_cpu_(start|end))' /root/kallsyms.kaslr-fixed
        0000000000000000 D __per_cpu_start
        0000000000014280 D __per_cpu_end
        ffffffffadc001c8 T _stext
      Signed-off-by: default avatarAndy Honig <ahonig@google.com>
      Signed-off-by: default avatarKees Cook <keescook@chromium.org>
      Cc: Michal Marek <mmarek@suse.cz>
      Cc: Rusty Russell <rusty@rustcorp.com.au>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      0f55159d