syzbot


uvm_fault: switchread
Status: fixed on 2019/01/06 10:35
Reported-by: syzbot+70f2d3ae684a55e035e0@syzkaller.appspotmail.com
Fix commit: 54e30ac1 Fix mbuf releated crashes in switch(4). They have been found by syzkaller as pool corruption panic. It is unclear which bug caused what, but it should be better now. - Check M_PKTHDR with assertion before accessing m_pkthdr. - Do not access oh_length without m_pullup(). - After checking if there is space at the end of the mbuf, don't overwrite the data at the beginning. Append the new content. - Do not set m_len and m_pkthdr.len when it is unclear whether the ofp_error header fits at all. Use m_makespace() to adjust the mbuf. Reported-by: syzbot+6efc0a9d5b700b54392e@syzkaller.appspotmail.com test akoshibe@; OK claudio@
First crash: 134d, last: 134d

Sample crash report:

All crashes (1):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro
ci-openbsd-main 2018/12/09 12:43 openbsd 3173a78d e699a2b9 .config log report