* [PATCH AUTOSEL 6.6 15/20] io_uring: clear opcode specific data for an early failure
[not found] <[email protected]>
@ 2024-04-03 17:17 ` Sasha Levin
0 siblings, 0 replies; only message in thread
From: Sasha Levin @ 2024-04-03 17:17 UTC (permalink / raw)
To: linux-kernel, stable
Cc: Jens Axboe, syzbot+f8e9a371388aa62ecab4, Sasha Levin, io-uring
From: Jens Axboe <[email protected]>
[ Upstream commit e21e1c45e1fe2e31732f40256b49c04e76a17cee ]
If failure happens before the opcode prep handler is called, ensure that
we clear the opcode specific area of the request, which holds data
specific to that request type. This prevents errors where opcode
handlers either don't get to clear per-request private data since prep
isn't even called.
Reported-and-tested-by: [email protected]
Signed-off-by: Jens Axboe <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>
---
io_uring/io_uring.c | 25 ++++++++++++++++---------
1 file changed, 16 insertions(+), 9 deletions(-)
diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index ea772a02c1405..c1e411017d8af 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -2147,6 +2147,13 @@ static void io_init_req_drain(struct io_kiocb *req)
}
}
+static __cold int io_init_fail_req(struct io_kiocb *req, int err)
+{
+ /* ensure per-opcode data is cleared if we fail before prep */
+ memset(&req->cmd.data, 0, sizeof(req->cmd.data));
+ return err;
+}
+
static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req,
const struct io_uring_sqe *sqe)
__must_hold(&ctx->uring_lock)
@@ -2167,29 +2174,29 @@ static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req,
if (unlikely(opcode >= IORING_OP_LAST)) {
req->opcode = 0;
- return -EINVAL;
+ return io_init_fail_req(req, -EINVAL);
}
def = &io_issue_defs[opcode];
if (unlikely(sqe_flags & ~SQE_COMMON_FLAGS)) {
/* enforce forwards compatibility on users */
if (sqe_flags & ~SQE_VALID_FLAGS)
- return -EINVAL;
+ return io_init_fail_req(req, -EINVAL);
if (sqe_flags & IOSQE_BUFFER_SELECT) {
if (!def->buffer_select)
- return -EOPNOTSUPP;
+ return io_init_fail_req(req, -EOPNOTSUPP);
req->buf_index = READ_ONCE(sqe->buf_group);
}
if (sqe_flags & IOSQE_CQE_SKIP_SUCCESS)
ctx->drain_disabled = true;
if (sqe_flags & IOSQE_IO_DRAIN) {
if (ctx->drain_disabled)
- return -EOPNOTSUPP;
+ return io_init_fail_req(req, -EOPNOTSUPP);
io_init_req_drain(req);
}
}
if (unlikely(ctx->restricted || ctx->drain_active || ctx->drain_next)) {
if (ctx->restricted && !io_check_restriction(ctx, req, sqe_flags))
- return -EACCES;
+ return io_init_fail_req(req, -EACCES);
/* knock it to the slow queue path, will be drained there */
if (ctx->drain_active)
req->flags |= REQ_F_FORCE_ASYNC;
@@ -2202,9 +2209,9 @@ static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req,
}
if (!def->ioprio && sqe->ioprio)
- return -EINVAL;
+ return io_init_fail_req(req, -EINVAL);
if (!def->iopoll && (ctx->flags & IORING_SETUP_IOPOLL))
- return -EINVAL;
+ return io_init_fail_req(req, -EINVAL);
if (def->needs_file) {
struct io_submit_state *state = &ctx->submit_state;
@@ -2228,12 +2235,12 @@ static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req,
req->creds = xa_load(&ctx->personalities, personality);
if (!req->creds)
- return -EINVAL;
+ return io_init_fail_req(req, -EINVAL);
get_cred(req->creds);
ret = security_uring_override_creds(req->creds);
if (ret) {
put_cred(req->creds);
- return ret;
+ return io_init_fail_req(req, ret);
}
req->flags |= REQ_F_CREDS;
}
--
2.43.0
^ permalink raw reply related [flat|nested] only message in thread