CVS commit: src/sys/arch/m68k/m68k

["Izumi Tsutsui" <tsutsui%netbsd.org@localhost>]

Module Name:    src
Committed By:   tsutsui
Date:           Thu Jan  5 18:27:48 UTC 2023

Modified Files:
        src/sys/arch/m68k/m68k: bus_dma.c

Log Message:
Fix out of bounds invalidate (and writeback) in bus_dmamap_sync(9) ops.

Detected by the POOL_REDZONE check in sys/kern/subr_pool.c that
has been activated if options DIAGNOSTIC is enabled on post netbsd-9.
The extra invalidate on DMASYNC_PREREAD op discards redzone pattern
data allocated right after an mbuf cluster without proper writeback
to memory so that it triggers false redzone assertions on freeing mbufs.
This bug was my botch in rev 1.25 committed 15 years ago. (sigh)

Fixes PR/57107 (kernel panic on -current when configuring network
with sn(4) on mac68k), as actually the bus_dma(9) op changes
in the past days were introduced for mac68k sn(4) improvements
by using the MI SONIC (src/sys/dev/ic/dp83932.c) driver.
 https://mail-index.netbsd.org/port-mac68k/2007/06/01/0001.html

Should be pulled up to netbsd-9 and netbsd-10.


To generate a diff of this commit:
cvs rdiff -u -r1.38 -r1.39 src/sys/arch/m68k/m68k/bus_dma.c

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