Daan De Meyer
d2fe659ff6
RestrictSUIDSGID= uses seccomp to check the mode argument of open(), openat(), and creat(). The IORING_OP_OPENAT and IORING_OP_OPENAT2 operations of io_uring don't go through those system calls, so they can still create SUID and SGID files. On kernels with io_uring BPF filters, let's refuse IORING_OP_OPENAT and IORING_OP_OPENAT2 requests that create a file with the SUID or SGID bit set. The io_uring filter can read the flags and mode of IORING_OP_OPENAT2, so we don't have to deny IORING_OP_OPENAT2 entirely, like we do for openat2().
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