cvs commit: src/sys/kern kern_malloc.c src/share/man/man9 Makefile redzone.9 src/sys/vm redzone.c redzone.h src/sys/conf NOTES files options

[Steve Kargl]

On Wed, Feb 01, 2006 at 10:47:52AM -0500, Andrew Gallatin wrote:
> Pawel Jakub Dawidek [pjd at FreeBSD.org] wrote:
> > 
> >   FreeBSD src repository
> > 
> >   Modified files:
> >     sys/kern             kern_malloc.c 
> >     share/man/man9       Makefile 
> >     sys/conf             NOTES files options 
> >   Added files:
> >     share/man/man9       redzone.9 
> >     sys/vm               redzone.c redzone.h 
> >   Log:
> >   Add buffer corruption protection (RedZone) for kernel's malloc(9).
> >   It detects both: buffer underflows and buffer overflows bugs at runtime
> >   (on free(9) and realloc(9)) and prints backtraces from where memory was
> >   allocated and from where it was freed.
> >   
> 
> If I enable DEBUG_REDZONE on an amd64 machine (UP, 512MB ram),
> I get this panic on startup:
> 
> FreeBSD 7.0-CURRENT #0: Tue Jan 31 17:17:41 EST 2006
>     gallatin at venice:/usr/src/sys/amd64/compile/VENICEW
> WARNING: WITNESS option enabled, expect reduced performance.
> Memory modified after free 0xffffff0000006d00(248) val=5 @ 0xffffff0000006dd0
> kernel trap 9 with interrupts disabled

You can trigger this panic without the red zone stuff.
See my string of post from yesterday.  Something went
into sys/ on 2006-01-26 that is causing the problems.
I suspect the pts code, but can't prove it, yet.

-- 
Steve