Re: [PATCH 1/2] perf,top: fix events overflow in top command

[Arnaldo Carvalho de Melo <acme@infradead.org>]

Em Wed, Mar 09, 2011 at 10:59:25AM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Mon, Mar 07, 2011 at 09:13:40PM +0100, Jiri Olsa escreveu:
> > The snprintf function returns number of printed characters even
> > if it cross the size parameter. So passing enough events via '-e'
> > parameter will cause segmentation fault.
> > 
> > It's reproduced by following command:
> > 
> > perf top -e `perf list | grep Tracepoint | awk -F'[' '\
> > {gsub(/[[:space:]]+/,"",$1);array[FNR]=$1}END{outputs=array[1];\
> > for (i=2;i<=FNR;i++){ outputs=outputs "," array[i];};print outputs}'`
> > 
> > Attached patch is adding SNPRINTF macro that provides the
> > overflow check and returns actuall number of printed characters.
> 
> Good catch, applying to perf/urgent.

Tried but it doesn't apply nor can I reproduce the overflow (albeit
granted the long line of events is annoying).

So I'm applying both patches to perf/core instead.

- Arnaldo