On Fri, Oct 20, 2017 at 4:40 PM, Wei Wei <dotwe...@gmail.com> wrote: > Sadly, the syzkaller characterized it as a non-reproducible bug and there > were empty > repro files. But if manually executing in VM like this “./syz-execprog > -executor= > ./syz-executor -repeat=0 -procs=16 -cover=0 crash-log”, it crashed when > executing exactly > program 1056 using log0 provided. > > I failed to generate the C reproducer with syz-repro as it said “no target > compiler” > in the final step. I would appreciate if you could give some hints.
syzkaller tries to use aarch64-linux-gnu-gcc when cross-compiling to arm64: https://github.com/google/syzkaller/blob/master/sys/targets/targets.go#L62 Try to install g++-aarch64-linux-gnu. Or how should it be done on your system? > Thanks, > Wei >> On 20 Oct 2017, at 7:14 AM, Mark Rutland <mark.rutl...@arm.com> wrote: >> >> On Thu, Oct 19, 2017 at 10:16:08PM -0400, Wei Wei wrote: >>> Hi all, >> >> Hi, >> >>> I have fuzzed v4.14-rc3 using syzkaller and found a bug similar to that one >>> [1]. >>> But the call trace isn’t the same. The atomic_inc() might handle a corrupted >>> skb_buff. >>> >>> The logs and config have been uploaded to my github repo [2]. >>> >>> [1] https://lkml.org/lkml/2017/10/2/216 >>> [2] https://github.com/dotweiba/skb_clone_atomic_inc_bug >> >> These do look very similar to what I was hitting; all appear to be >> misaligned atomics in the same path. >> >> I see that you have some empty repro files in [2]. If you have any >> reproducers, would you mind sharing them? >> >> If any of those are smaller or more reliable than the one I was able to >> generate [3], it might make it more obvious what's going on, and/or make >> it simpler to come up with a plain C reproducer. >> >> Thanks, >> Mark. >> >> [3] >> https://www.kernel.org/pub/linux/kernel/people/mark/bugs/20171002-skb_clone-misaligned-atomic/syzkaller.repro > > -- > You received this message because you are subscribed to the Google Groups > "syzkaller" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to syzkaller+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout.
