Bug 5453 - mm: kfence: fix false positives on big endian
Summary: mm: kfence: fix false positives on big endian
Status: RESOLVED FIXED
Alias: None
Product: ANCK 5.10 Dev
Classification: ANCK
Component: drivers (show other bugs) drivers
Version: 5.10.y-15
Hardware: All Linux
: P3-Medium S3-normal
Target Milestone: ---
Assignee: GuixinLiu
QA Contact: shuming
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2023-06-07 19:22 UTC by inspursand
Modified: 2023-06-07 19:34 UTC (History)
2 users (show)

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Description inspursand inspur_group 2023-06-07 19:22:06 UTC 
Description of problem:
Since commit 1ba3cbf3ec3b ("mm: kfence: improve the performance of
__kfence_alloc() and __kfence_free()"), kfence reports failures in random
places at boot on big endian machines.

The problem is that the new KFENCE_CANARY_PATTERN_U64 encodes the address
of each byte in its value, so it needs to be byte swapped on big endian
machines.

The compiler is smart enough to do the le64_to_cpu() at compile time, so
there is no runtime overhead.


Version-Release number of selected component (if applicable):
5.10

How reproducible:


Steps to Reproduce:
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Actual results:


Expected results:


Additional info:
Comment 1 inspursand inspur_group 2023-06-07 19:34:13 UTC 
invalid