CVS commit: src/sys/arch/amd64/amd64

["Maxime Villard" <maxv%netbsd.org@localhost>]

Module Name:    src
Committed By:   maxv
Date:           Wed Aug 22 17:04:36 UTC 2018

Modified Files:
        src/sys/arch/amd64/amd64: asan.c spl.S

Log Message:
Explicitly unpoison the stack when entering a softint.

Softints are the only place where we "discard" a part of the stack: we may
have left the thread without allowing the asan instrumentation to clear
the poison, and in this case, we can get false positives when we hit a
poisoned area of the stack while executing another handler within the same
softint thread.

(I was actually getting a rare false positive in ip6intr.)


To generate a diff of this commit:
cvs rdiff -u -r1.3 -r1.4 src/sys/arch/amd64/amd64/asan.c
cvs rdiff -u -r1.35 -r1.36 src/sys/arch/amd64/amd64/spl.S

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.