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x86, boot: Skip relocs when load address unchanged

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On 64-bit, relocation is not required unless the load address gets
changed. Without this, relocations do unexpected things when the kernel
is above 4G.

Reported-by: Baoquan He <bhe@redhat.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Tested-by: Thomas D. <whissi@whissi.de>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Jan Beulich <JBeulich@suse.com>
Cc: Junjie Mao <eternal.n08@gmail.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: stable@vger.kernel.org
Link: http://lkml.kernel.org/r/20150116005146.GA4212@www.outflux.net
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Kees Cook 2015-01-15 16:51:46 -08:00 committed by Thomas Gleixner
parent 8abb850a03
commit f285f4a21c
1 changed files with 8 additions and 1 deletions
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9
arch/x86/boot/compressed/misc.c
View file

@ -373,6 +373,8 @@ asmlinkage __visible void *decompress_kernel(void *rmode, memptr heap,
unsigned long output_len,
unsigned long run_size)
{
unsigned char *output_orig = output;
real_mode = rmode;
sanitize_boot_params(real_mode);
@ -421,7 +423,12 @@ asmlinkage __visible void *decompress_kernel(void *rmode, memptr heap,
debug_putstr("\nDecompressing Linux... ");
decompress(input_data, input_len, NULL, NULL, output, NULL, error);
parse_elf(output);
handle_relocations(output, output_len);
/*
* 32-bit always performs relocations. 64-bit relocations are only
* needed if kASLR has chosen a different load address.
*/
if (!IS_ENABLED(CONFIG_X86_64) || output != output_orig)
handle_relocations(output, output_len);
debug_putstr("done.\nBooting the kernel.\n");
return output;
}