I made a clone on https://github.com/bansan85/pixman/tree/stress_test_file I tried to make lots of small commits to make review easier. I still have a crash. Please use the new file enclosed. The previous one is not working anymore. I don't used HAVE_GCC_VECTOR_EXTENSIONS but I tried to make the code compatible.
To run the stress-test : ./stress-test -f rasterize_edges_8_min.crash 2017-11-17 12:31 GMT+01:00 Emil Velikov <[email protected]>: > Hi Vincent, > > On 15 November 2017 at 21:37, LE GARREC Vincent > <[email protected]> wrote: > > Dear, > > > > I ran stress-test under fuzzing and I found a crash. > > > > I'm not really comfortable with pixman so I don't really know how to > report > > you the problem. > > > > Please find enclosed modifications I needed to apply to allow fuzzing > with > > afl. > > I disabled HAVE_GCC_VECTOR_EXTENSIONS and adapt smallprng_rand_r to read > > from buffer instead of random data based on seed. > > > > To make the stress-test crashes, run ./stress-test > rasterize_edges_8.crash > > > > I hope it's not my patch that make pixman crashes. > > > > Please, tell me if you need further information or if I did something > wrong. > > > I'm not that muhc of a pixman to provide you with feedback on the exact > issue. > > Small question though: > Have you considered adding a argument to the program which changes > rand -> input file method? > > It will allow you to drop the HAVE_GCC_VECTOR_EXTENSIONS workarounds > and upstream the changes. > This way one will be able to do some extensive testing prior to > rolling a potentially vulnerable pixman release to the masses. > > HTH > Emil >
rasterize_edges_8_min.crash
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