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kmsan: accept ranges starting with 0 on s390

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On s390 the virtual address 0 is valid (current CPU's lowcore is mapped
there), therefore KMSAN should not complain about it.

Disable the respective check on s390.  There doesn't seem to be a Kconfig
option to describe this situation, so explicitly check for s390.

Link: https://lkml.kernel.org/r/20240621113706.315500-22-iii@linux.ibm.com
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Reviewed-by: Alexander Potapenko <glider@google.com>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Christian Borntraeger <borntraeger@linux.ibm.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: <kasan-dev@googlegroups.com>
Cc: Marco Elver <elver@google.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Steven Rostedt (Google) <rostedt@goodmis.org>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Ilya Leoshkevich 2024-06-21 13:35:05 +02:00 committed by Andrew Morton
parent 89f42df66c
commit cd613bd699
1 changed files with 4 additions and 1 deletions
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5
mm/kmsan/init.c
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@ -33,7 +33,10 @@ static void __init kmsan_record_future_shadow_range(void *start, void *end)
bool merged = false;
KMSAN_WARN_ON(future_index == NUM_FUTURE_RANGES);
KMSAN_WARN_ON((nstart >= nend) || !nstart || !nend);
KMSAN_WARN_ON((nstart >= nend) ||
/* Virtual address 0 is valid on s390. */
(!IS_ENABLED(CONFIG_S390) && !nstart) ||
!nend);
nstart = ALIGN_DOWN(nstart, PAGE_SIZE);
nend = ALIGN(nend, PAGE_SIZE);