[PATCH v4 0/2] fix the missing underflow in memory operation function

The patchsets help to produce KASAN report when size is negative numbers
in memory operation function. It is helpful for programmer to solve the 
undefined behavior issue. Patch 1 based on Dmitry's review and
suggestion, patch 2 is a test in order to verify the patch 1. 

[1]https://bugzilla.kernel.org/show_bug.cgi?id=199341 
[2]https://lore.kernel.org/linux-arm-kernel/20190927034338.15813-1-walter-zh.wu@mediatek.com/ (local) 

Walter Wu (2): 
kasan: detect negative size in memory operation function 
kasan: add test for invalid size in memmove
---
Changes in v2:
fix the indentation, thanks for the reminder Matthew.

Changes in v3:
Add a confition for memory operation function, need to
avoid the false alarm when KASAN un-initialized.

Changes in v4:
modify negative size condition
modify comments
modify the fixed code about early stages of boot
---
 include/linux/kasan.h     |  2 +-
 lib/test_kasan.c          | 18 ------------------
 mm/kasan/common.c         | 25 +++++++------------------
 mm/kasan/generic.c        |  9 ++++-----
 mm/kasan/generic_report.c | 11 -----------
 mm/kasan/kasan.h          |  2 +-
 mm/kasan/report.c         |  5 ++++-
 mm/kasan/tags.c           |  9 ++++-----
 mm/kasan/tags_report.c    | 11 -----------
 9 files changed, 21 insertions(+), 71 deletions(-)

-- 
2.18.0
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