syzbot


KASAN: use-after-free Write in __alloc_skb (2)
Status: fixed on 2020/02/18 14:31
Reported-by: syzbot+@syzkaller.appspotmail.com
Fix commit: d836f5c6 net-backports: net: rtnetlink: validate IFLA_MTU attribute in rtnl_create_link()
First crash: 70d, last: 54d

Cause bisection: the bug happens on the oldest tested release
Crash: KASAN: use-after-free Write in __alloc_skb (log)
Repro: C syz .config
similar bugs (3):
Kernel Title Repro Bisected Count Last Reported Patched Status
linux-4.19 KASAN: use-after-free Write in __alloc_skb C fix 2 40d 108d 1/1 fixed on 2020/02/11 15:16
upstream KASAN: use-after-free Write in __alloc_skb 2 95d 100d 0/17 closed as invalid on 2019/12/08 05:44
linux-4.14 KASAN: use-after-free Write in __alloc_skb C fix 1 40d 70d 1/1 fixed on 2020/02/14 21:56

Sample crash report:

Crashes (7):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro Maintainers
ci-upstream-kasan-gce-selinux-root 2019/12/13 14:24 upstream ae4b064e 08003f64 .config log report syz C davem@davemloft.net, kuznet@ms2.inr.ac.ru, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, yoshfuji@linux-ipv6.org
ci-upstream-kasan-gce-root 2019/12/13 09:38 upstream ae4b064e 08003f64 .config log report syz C davem@davemloft.net, kuznet@ms2.inr.ac.ru, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, yoshfuji@linux-ipv6.org
ci-upstream-kasan-gce 2019/12/13 08:10 upstream ae4b064e 08003f64 .config log report syz C davem@davemloft.net, kuznet@ms2.inr.ac.ru, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, yoshfuji@linux-ipv6.org
ci-upstream-kasan-gce-386 2019/12/13 08:30 upstream ae4b064e 08003f64 .config log report syz C davem@davemloft.net, kuznet@ms2.inr.ac.ru, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, yoshfuji@linux-ipv6.org
ci-upstream-linux-next-kasan-gce-root 2019/12/24 16:12 linux-next 7ddd09fc be5c2c81 .config log report syz C davem@davemloft.net, kuznet@ms2.inr.ac.ru, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, yoshfuji@linux-ipv6.org
ci-upstream-kasan-gce 2019/12/29 18:23 upstream bf8d1cd4 af6b8ef8 .config log report davem@davemloft.net, kuznet@ms2.inr.ac.ru, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, yoshfuji@linux-ipv6.org
ci-upstream-kasan-gce 2019/12/13 07:45 upstream ae4b064e 08003f64 .config log report davem@davemloft.net, kuznet@ms2.inr.ac.ru, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, yoshfuji@linux-ipv6.org