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x86/KASLR: Fix boot crash with certain memory configurations

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Ye Xiaolong reported this boot crash:

|
|  XZ-compressed data is corrupt
|
|   -- System halted
|

Fix the bug in mem_avoid_overlap() of finding the earliest overlap.

Reported-and-tested-by: Ye Xiaolong <xiaolong.ye@intel.com>
Signed-off-by: Baoquan He <bhe@redhat.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>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Baoquan He 2016-07-01 15:34:40 +08:00 committed by Ingo Molnar
parent dbf984d825
commit 6daa2ec0b3
1 changed files with 2 additions and 0 deletions
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2
arch/x86/boot/compressed/kaslr.c
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@ -285,6 +285,7 @@ static bool mem_avoid_overlap(struct mem_vector *img,
if (mem_overlaps(img, &mem_avoid[i]) &&
mem_avoid[i].start < earliest) {
*overlap = mem_avoid[i];
earliest = overlap->start;
is_overlapping = true;
}
}
@ -299,6 +300,7 @@ static bool mem_avoid_overlap(struct mem_vector *img,
if (mem_overlaps(img, &avoid) && (avoid.start < earliest)) {
*overlap = avoid;
earliest = overlap->start;
is_overlapping = true;
}