[PATCH AUTOSEL 6.14 011/642] io_uring/msg: initialise msg request opcode

[PATCH AUTOSEL 6.14 011/642] io_uring/msg: initialise msg request opcode

[Sasha Levin]

From: Pavel Begunkov <asml.silence@gmail.com>

[ Upstream commit 9cc0bbdaba2a66ad90bc6ce45163b7745baffe98 ]

It's risky to have msg request opcode set to garbage, so at least
initialise it to nop. Later we might want to add a user inaccessible
opcode for such cases.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/9afe650fcb348414a4529d89f52eb8969ba06efd.1743190078.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 io_uring/msg_ring.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/io_uring/msg_ring.c b/io_uring/msg_ring.c
index 7e6f68e911f10..f844ab24cda42 100644
--- a/io_uring/msg_ring.c
+++ b/io_uring/msg_ring.c
@@ -93,6 +93,7 @@ static int io_msg_remote_post(struct io_ring_ctx *ctx, struct io_kiocb *req,
 		kmem_cache_free(req_cachep, req);
 		return -EOWNERDEAD;
 	}
+	req->opcode = IORING_OP_NOP;
 	req->cqe.user_data = user_data;
 	io_req_set_res(req, res, cflags);
 	percpu_ref_get(&ctx->refs);
-- 
2.39.5

[PATCH AUTOSEL 6.14 412/642] io_uring: use IO_REQ_LINK_FLAGS more

[Sasha Levin]

From: Caleb Sander Mateos <csander@purestorage.com>

[ Upstream commit 0e8934724f78602635d6e11c97ef48caa693cb65 ]

Replace the 2 instances of REQ_F_LINK | REQ_F_HARDLINK with
the more commonly used IO_REQ_LINK_FLAGS.

Signed-off-by: Caleb Sander Mateos <csander@purestorage.com>
Link: https://lore.kernel.org/r/20250211202002.3316324-1-csander@purestorage.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 io_uring/io_uring.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index 24b9e9a5105d4..96c660bf4ef59 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -110,11 +110,13 @@
 #define SQE_VALID_FLAGS	(SQE_COMMON_FLAGS | IOSQE_BUFFER_SELECT | \
 			IOSQE_IO_DRAIN | IOSQE_CQE_SKIP_SUCCESS)
 
+#define IO_REQ_LINK_FLAGS (REQ_F_LINK | REQ_F_HARDLINK)
+
 #define IO_REQ_CLEAN_FLAGS (REQ_F_BUFFER_SELECTED | REQ_F_NEED_CLEANUP | \
 				REQ_F_POLLED | REQ_F_INFLIGHT | REQ_F_CREDS | \
 				REQ_F_ASYNC_DATA)
 
-#define IO_REQ_CLEAN_SLOW_FLAGS (REQ_F_REFCOUNT | REQ_F_LINK | REQ_F_HARDLINK |\
+#define IO_REQ_CLEAN_SLOW_FLAGS (REQ_F_REFCOUNT | IO_REQ_LINK_FLAGS | \
 				 REQ_F_REISSUE | IO_REQ_CLEAN_FLAGS)
 
 #define IO_TCTX_REFS_CACHE_NR	(1U << 10)
@@ -131,7 +133,6 @@ struct io_defer_entry {
 
 /* requests with any of those set should undergo io_disarm_next() */
 #define IO_DISARM_MASK (REQ_F_ARM_LTIMEOUT | REQ_F_LINK_TIMEOUT | REQ_F_FAIL)
-#define IO_REQ_LINK_FLAGS (REQ_F_LINK | REQ_F_HARDLINK)
 
 /*
  * No waiters. It's larger than any valid value of the tw counter
@@ -1158,7 +1159,7 @@ static inline void io_req_local_work_add(struct io_kiocb *req,
 	 * We don't know how many reuqests is there in the link and whether
 	 * they can even be queued lazily, fall back to non-lazy.
 	 */
-	if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK))
+	if (req->flags & IO_REQ_LINK_FLAGS)
 		flags &= ~IOU_F_TWQ_LAZY_WAKE;
 
 	guard(rcu)();
-- 
2.39.5

[PATCH AUTOSEL 6.14 413/642] io_uring: sanitise ring params earlier

[Sasha Levin]

From: Pavel Begunkov <asml.silence@gmail.com>

[ Upstream commit 92a3bac9a57c39728226ab191859c85f5e2829c0 ]

Do all struct io_uring_params validation early on before allocating the
context. That makes initialisation easier, especially by having fewer
places where we need to care about partial de-initialisation.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/363ba90b83ff78eefdc88b60e1b2c4a39d182247.1738344646.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 io_uring/io_uring.c | 77 ++++++++++++++++++++++++++-------------------
 1 file changed, 44 insertions(+), 33 deletions(-)

diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index 96c660bf4ef59..bb4fb2faf6baf 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -3539,6 +3539,44 @@ static struct file *io_uring_get_file(struct io_ring_ctx *ctx)
 					 O_RDWR | O_CLOEXEC, NULL);
 }
 
+static int io_uring_sanitise_params(struct io_uring_params *p)
+{
+	unsigned flags = p->flags;
+
+	/* There is no way to mmap rings without a real fd */
+	if ((flags & IORING_SETUP_REGISTERED_FD_ONLY) &&
+	    !(flags & IORING_SETUP_NO_MMAP))
+		return -EINVAL;
+
+	if (flags & IORING_SETUP_SQPOLL) {
+		/* IPI related flags don't make sense with SQPOLL */
+		if (flags & (IORING_SETUP_COOP_TASKRUN |
+			     IORING_SETUP_TASKRUN_FLAG |
+			     IORING_SETUP_DEFER_TASKRUN))
+			return -EINVAL;
+	}
+
+	if (flags & IORING_SETUP_TASKRUN_FLAG) {
+		if (!(flags & (IORING_SETUP_COOP_TASKRUN |
+			       IORING_SETUP_DEFER_TASKRUN)))
+			return -EINVAL;
+	}
+
+	/* HYBRID_IOPOLL only valid with IOPOLL */
+	if ((flags & IORING_SETUP_HYBRID_IOPOLL) && !(flags & IORING_SETUP_IOPOLL))
+		return -EINVAL;
+
+	/*
+	 * For DEFER_TASKRUN we require the completion task to be the same as
+	 * the submission task. This implies that there is only one submitter.
+	 */
+	if ((flags & IORING_SETUP_DEFER_TASKRUN) &&
+	    !(flags & IORING_SETUP_SINGLE_ISSUER))
+		return -EINVAL;
+
+	return 0;
+}
+
 int io_uring_fill_params(unsigned entries, struct io_uring_params *p)
 {
 	if (!entries)
@@ -3549,10 +3587,6 @@ int io_uring_fill_params(unsigned entries, struct io_uring_params *p)
 		entries = IORING_MAX_ENTRIES;
 	}
 
-	if ((p->flags & IORING_SETUP_REGISTERED_FD_ONLY)
-	    && !(p->flags & IORING_SETUP_NO_MMAP))
-		return -EINVAL;
-
 	/*
 	 * Use twice as many entries for the CQ ring. It's possible for the
 	 * application to drive a higher depth than the size of the SQ ring,
@@ -3614,6 +3648,10 @@ static __cold int io_uring_create(unsigned entries, struct io_uring_params *p,
 	struct file *file;
 	int ret;
 
+	ret = io_uring_sanitise_params(p);
+	if (ret)
+		return ret;
+
 	ret = io_uring_fill_params(entries, p);
 	if (unlikely(ret))
 		return ret;
@@ -3661,37 +3699,10 @@ static __cold int io_uring_create(unsigned entries, struct io_uring_params *p,
 	 * For SQPOLL, we just need a wakeup, always. For !SQPOLL, if
 	 * COOP_TASKRUN is set, then IPIs are never needed by the app.
 	 */
-	ret = -EINVAL;
-	if (ctx->flags & IORING_SETUP_SQPOLL) {
-		/* IPI related flags don't make sense with SQPOLL */
-		if (ctx->flags & (IORING_SETUP_COOP_TASKRUN |
-				  IORING_SETUP_TASKRUN_FLAG |
-				  IORING_SETUP_DEFER_TASKRUN))
-			goto err;
+	if (ctx->flags & (IORING_SETUP_SQPOLL|IORING_SETUP_COOP_TASKRUN))
 		ctx->notify_method = TWA_SIGNAL_NO_IPI;
-	} else if (ctx->flags & IORING_SETUP_COOP_TASKRUN) {
-		ctx->notify_method = TWA_SIGNAL_NO_IPI;
-	} else {
-		if (ctx->flags & IORING_SETUP_TASKRUN_FLAG &&
-		    !(ctx->flags & IORING_SETUP_DEFER_TASKRUN))
-			goto err;
+	else
 		ctx->notify_method = TWA_SIGNAL;
-	}
-
-	/* HYBRID_IOPOLL only valid with IOPOLL */
-	if ((ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_HYBRID_IOPOLL)) ==
-			IORING_SETUP_HYBRID_IOPOLL)
-		goto err;
-
-	/*
-	 * For DEFER_TASKRUN we require the completion task to be the same as the
-	 * submission task. This implies that there is only one submitter, so enforce
-	 * that.
-	 */
-	if (ctx->flags & IORING_SETUP_DEFER_TASKRUN &&
-	    !(ctx->flags & IORING_SETUP_SINGLE_ISSUER)) {
-		goto err;
-	}
 
 	/*
 	 * This is just grabbed for accounting purposes. When a process exits,
-- 
2.39.5