x86/boot: Provide more slack space during decompression
authorJan H. Schönherr <jschoenh@amazon.de>
Sun, 27 Aug 2017 13:55:24 +0000 (15:55 +0200)
committerIngo Molnar <mingo@kernel.org>
Tue, 29 Aug 2017 11:32:50 +0000 (13:32 +0200)
commit5746f0555d00e1cbb7bc20a2fd09041ace6f350c
treeda5c0cba57ebae270083bba262f0c77eaffbf30c
parenteaa2f87c6b840b83827c40db6eb8481689570259
x86/boot: Provide more slack space during decompression

The current slack space is not enough for LZ4, which has a worst case
overhead of 0.4% for data that cannot be further compressed. With
an LZ4 compressed kernel with an embedded initrd, the output is likely
to overwrite the input.

Increase the slack space to avoid that.

Signed-off-by: Jan H. Schönherr <jschoenh@amazon.de>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1503842124-29718-1-git-send-email-jschoenh@amazon.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
arch/x86/boot/header.S