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

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

Module Name:    src
Committed By:   tsutsui
Date:           Tue Feb 23 16:54:17 UTC 2021

Modified Files:
        src/sys/arch/m68k/m68k: reenter_syscall.s

Log Message:
Plug kernel stack leaks in reenter_syscall() for setcontext(2).

This fixes long standing kernel crashes (MMU fault, address error,
and silent freeze by a double bus fault etc. seen for ~10 years)
caused by kernel stack overflow, especially on x68k and sun3 running
Xorg based servers.  See PR/55990 for more details.

"This change seems perfectly reasonable" from thorpej@ and
jklos@ also reported this also solved freeze of his mac68k system
with 10 megabyes of memory.

Should be pulled up to netbsd-9 and netbsd-8.


To generate a diff of this commit:
cvs rdiff -u -r1.6 -r1.7 src/sys/arch/m68k/m68k/reenter_syscall.s

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