* [mmotm:master 156/234] lib/test_kasan.c:478:27: sparse: Variable length array is used.
@ 2017-12-23 12:49 kbuild test robot
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From: kbuild test robot @ 2017-12-23 12:49 UTC (permalink / raw)
To: Paul Lawrence
Cc: kbuild-all, Johannes Weiner, Greg Hackmann, Andrew Morton,
Linux Memory Management List
tree: git://git.cmpxchg.org/linux-mmotm.git master
head: a4f20e3ed193cd4b2f742ce37f88112c7441146f
commit: e329261f769afff2744bfeaad6cb7e8c03048e27 [156/234] kasan: add tests for alloca poisoning
reproduce:
# apt-get install sparse
git checkout e329261f769afff2744bfeaad6cb7e8c03048e27
make ARCH=x86_64 allmodconfig
make C=1 CF=-D__CHECK_ENDIAN__
sparse warnings: (new ones prefixed by >>)
vim +478 lib/test_kasan.c
474
475 static noinline void __init kasan_alloca_oob_left(void)
476 {
477 volatile int i = 10;
> 478 char alloca_array[i];
479 char *p = alloca_array - 1;
480
481 pr_info("out-of-bounds to left on alloca\n");
482 *(volatile char *)p;
483 }
484
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