• J
    io_uring: don't touch ctx in setup after ring fd install · 044c1ab3
    Jens Axboe 提交于
    syzkaller reported an issue where it looks like a malicious app can
    trigger a use-after-free of reading the ctx ->sq_array and ->rings
    value right after having installed the ring fd in the process file
    table.
    
    Defer ring fd installation until after we're done reading those
    values.
    
    Fixes: 75b28aff ("io_uring: allocate the two rings together")
    Reported-by: syzbot+6f03d895a6cd0d06187f@syzkaller.appspotmail.com
    Signed-off-by: NJens Axboe <axboe@kernel.dk>
    044c1ab3
io_uring.c 95.6 KB