x86, boot: Sanitize boot_params if not zeroed on creation

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Use the new sentinel field to detect bootloaders which fail to follow
protocol and don't initialize fields in struct boot_params that they
do not explicitly initialize to zero.

Based on an original patch and research by Yinghai Lu.
Changed by hpa to be invoked both in the decompression path and in the
kernel proper; the latter for the case where a bootloader takes over
decompression.

Originally-by: Yinghai Lu <yinghai@kernel.org>
Link: http://lkml.kernel.org/r/1359058816-7615-26-git-send-email-yinghai@kernel.org
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

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This commit is contained in:

H. Peter Anvin 2013-01-29 01:05:24 -08:00

parent 09c205afde

commit 5dcd14ecd4

5 changed files with 46 additions and 0 deletions

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2

arch/x86/boot/compressed/misc.c

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1

arch/x86/boot/compressed/misc.h

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38

arch/x86/include/asm/bootparam_utils.h

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arch/x86/kernel/head32.c

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arch/x86/kernel/head64.c

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