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x86, kaslr: Return location from decompress_kernel

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This allows decompress_kernel to return a new location for the kernel to
be relocated to. Additionally, enforces CONFIG_PHYSICAL_START as the
minimum relocation position when building with CONFIG_RELOCATABLE.

With CONFIG_RANDOMIZE_BASE set, the choose_kernel_location routine
will select a new location to decompress the kernel, though here it is
presently a no-op. The kernel command line option "nokaslr" is introduced
to bypass these routines.

Signed-off-by: Kees Cook <keescook@chromium.org>
Link: http://lkml.kernel.org/r/1381450698-28710-3-git-send-email-keescook@chromium.org
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
Kees Cook
2013-10-10 17:18:14 -07:00
committed by H. Peter Anvin
parent dd78b97367
commit 8ab3820fd5
9 changed files with 106 additions and 24 deletions
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2
arch/x86/boot/compressed/cmdline.c
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@@ -1,6 +1,6 @@
#include "misc.h"
#ifdef CONFIG_EARLY_PRINTK
#if CONFIG_EARLY_PRINTK || CONFIG_RANDOMIZE_BASE
static unsigned long fs;
static inline void set_fs(unsigned long seg)