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
sgk at troutmask.apl.washington.edu
Wed Feb 1 08:09:28 PST 2006
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.
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