On 11/5/20 9:14 AM, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: 4ef8451b Merge tag 'perf-tools-for-v5.10-2020-11-03' of gi.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=12bf23a8500000 > kernel config: https://syzkaller.appspot.com/x/.config?x=61033507391c77ff > dashboard link: https://syzkaller.appspot.com/bug?extid=a6d494688cdb797bdfce > compiler: gcc (GCC) 10.1.0-syz 20200507 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11022732500000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13649314500000 > > The issue was bisected to: > > commit 1e6fa5216a0e59ef02e8b6b40d553238a3b81d49 > Author: Jens Axboe <axboe@xxxxxxxxx> > Date: Thu Oct 15 14:46:24 2020 +0000 > > io_uring: COW io_identity on mismatch Gah, stupid braino in that patch. Below should fix it. diff --git a/fs/io_uring.c b/fs/io_uring.c index 3d489cf31926..29f1417690d5 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -8974,7 +8974,8 @@ SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit, #ifdef CONFIG_PROC_FS static int io_uring_show_cred(int id, void *p, void *data) { - const struct cred *cred = p; + struct io_identity *iod = p; + const struct cred *cred = iod->creds; struct seq_file *m = data; struct user_namespace *uns = seq_user_ns(m); struct group_info *gi; -- Jens Axboe
