Em Wed, Feb 22, 2017 at 08:23:29PM -0300, Arnaldo Carvalho de Melo escreveu:
Em Tue, Feb 21, 2017 at 12:39:35PM -0300, Arnaldo Carvalho de Melo escreveu:
Em Tue, Feb 21, 2017 at 05:34:54PM +0200, Elena Reshetova escreveu:
Now when new refcount_t type and API are finally merged (see include/linux/refcount.h), the following patches convert various refcounters in the tools susystem from atomic_t to refcount_t. By doing this we prevent intentional or accidental underflows or overflows that can led to use-after-free vulnerabilities.
Thanks for working on this! I was almost going to jump on doing this myself!
I'll try and get this merged ASAP.
So, please take a look at my tmp.perf/refcount branch at:
git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git
There are multiple fixes in it to get it to build and test it, so far, with:
perf top -F 15000 -d 0
while doing kernel builds and tight usleep 1 loops to create lots of short lived threads with its map_groups, maps, dsos, etc.
Now running some build tests in some 36 containers with assorted distros and cross compilers.
Tomorrow I'll inject some refcount errors to test this all.
- Arnaldo