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Date: Mon, 1 Oct 2018 18:23:43 +0000 From: Alexei Starovoitov <alexei.starovoitov@...il.com> To: syzbot+18628320d3b14a5c459c@...kaller.appspotmail.com, Roman Gushchin <guro@...com> Cc: Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, LKML <linux-kernel@...r.kernel.org>, Network Development <netdev@...r.kernel.org>, syzkaller-bugs <syzkaller-bugs@...glegroups.com> Subject: Re: WARNING in pcpu_alloc On Mon, Oct 1, 2018 at 6:14 PM syzbot <syzbot+18628320d3b14a5c459c@...kaller.appspotmail.com> wrote: > > Hello, > > syzbot found the following crash on: > > HEAD commit: c5a9f9817ba5 Merge branch 'bpf-per-cpu-cgroup-local-storage' > git tree: bpf-next > console output: https://syzkaller.appspot.com/x/log.txt?x=175f98e6400000 > kernel config: https://syzkaller.appspot.com/x/.config?x=443816db871edd66 > dashboard link: https://syzkaller.appspot.com/bug?extid=18628320d3b14a5c459c > compiler: gcc (GCC) 8.0.1 20180413 (experimental) > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=129cbd1a400000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16685ac9400000 > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+18628320d3b14a5c459c@...kaller.appspotmail.com > > ------------[ cut here ]------------ > illegal size (0) or align (8) for percpu allocation Roman, looks like if (attr->value_size > PAGE_SIZE) return ERR_PTR(-E2BIG); is not enough, since value_size==0 needs to be rejected as well. Could you prepare a patch?
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