linux-kernel - linux-next: manual merge of the selinux tree with the block tree

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Date:   Thu, 7 Oct 2021 11:56:53 +1100
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Paul Moore <paul@...l-moore.com>, Jens Axboe <axboe@...nel.dk>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        Pavel Begunkov <asml.silence@...il.com>
Subject: linux-next: manual merge of the selinux tree with the block tree

Hi all,

Today's linux-next merge of the selinux tree got a conflict in:

  fs/io_uring.c

between commit:

  3d2b8972f292 ("io_uring: optimise plugging")

from the block tree and commit:

  5bd2182d58e9 ("audit,io_uring,io-wq: add some basic audit support to io_uring")

from the selinux tree.

I fixed it up (see below) and can carry the fix as necessary. This
is now fixed as far as linux-next is concerned, but any non trivial
conflicts should be mentioned to your upstream maintainer when your tree
is submitted for merging.  You may also want to consider cooperating
with the maintainer of the conflicting tree to minimise any particularly
complex conflicts.

-- 
Cheers,
Stephen Rothwell

diff --cc fs/io_uring.c
index 73135c5c6168,f89d00af3a67..000000000000
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@@ -903,8 -917,10 +905,10 @@@ struct io_op_def 
  	unsigned		buffer_select : 1;
  	/* do prep async if is going to be punted */
  	unsigned		needs_async_setup : 1;
 -	/* should block plug */
 -	unsigned		plug : 1;
 +	/* opcode is not supported by this kernel */
 +	unsigned		not_supported : 1;
+ 	/* skip auditing */
+ 	unsigned		audit_skip : 1;
  	/* size of async data needed, if any */
  	unsigned short		async_size;
  };
@@@ -6542,9 -6622,12 +6576,12 @@@ static int io_issue_sqe(struct io_kioc
  	const struct cred *creds = NULL;
  	int ret;
  
 -	if ((req->flags & REQ_F_CREDS) && req->creds != current_cred())
 +	if (unlikely((req->flags & REQ_F_CREDS) && req->creds != current_cred()))
  		creds = override_creds(req->creds);
  
+ 	if (!io_op_defs[req->opcode].audit_skip)
+ 		audit_uring_entry(req->opcode);
+ 
  	switch (req->opcode) {
  	case IORING_OP_NOP:
  		ret = io_nop(req, issue_flags);
@@@ -7042,10 -7071,34 +7082,15 @@@ static int io_init_req(struct io_ring_c
  		if (!req->creds)
  			return -EINVAL;
  		get_cred(req->creds);
+ 		ret = security_uring_override_creds(req->creds);
+ 		if (ret) {
+ 			put_cred(req->creds);
+ 			return ret;
+ 		}
  		req->flags |= REQ_F_CREDS;
  	}
 -	state = &ctx->submit_state;
 -
 -	/*
 -	 * Plug now if we have more than 1 IO left after this, and the target
 -	 * is potentially a read/write to block based storage.
 -	 */
 -	if (!state->plug_started && state->ios_left > 1 &&
 -	    io_op_defs[req->opcode].plug) {
 -		blk_start_plug(&state->plug);
 -		state->plug_started = true;
 -	}
 -
 -	if (io_op_defs[req->opcode].needs_file) {
 -		req->file = io_file_get(ctx, req, READ_ONCE(sqe->fd),
 -					(sqe_flags & IOSQE_FIXED_FILE));
 -		if (unlikely(!req->file))
 -			ret = -EBADF;
 -	}
  
 -	state->ios_left--;
 -	return ret;
 +	return io_req_prep(req, sqe);
  }
  
  static int io_submit_sqe(struct io_ring_ctx *ctx, struct io_kiocb *req,

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