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io_uring: support using a registered personality for commands

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For personalities previously registered via IORING_REGISTER_PERSONALITY,
allow any command to select them. This is done through setting
sqe->personality to the id returned from registration, and then flagging
sqe->flags with IOSQE_PERSONALITY.

Reviewed-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2020-01-28 10:15:23 -07:00
parent 071698e13a
commit 75c6a03904
2 changed files with 25 additions and 2 deletions
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20
fs/io_uring.c
View File

@ -4626,9 +4626,10 @@ static inline void io_queue_link_head(struct io_kiocb *req)
static bool io_submit_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe,
struct io_submit_state *state, struct io_kiocb **link)
{
const struct cred *old_creds = NULL;
struct io_ring_ctx *ctx = req->ctx;
unsigned int sqe_flags;
int ret;
int ret, id;
sqe_flags = READ_ONCE(sqe->flags);
@ -4637,6 +4638,19 @@ static bool io_submit_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe,
ret = -EINVAL;
goto err_req;
}
id = READ_ONCE(sqe->personality);
if (id) {
const struct cred *personality_creds;
personality_creds = idr_find(&ctx->personality_idr, id);
if (unlikely(!personality_creds)) {
ret = -EINVAL;
goto err_req;
}
old_creds = override_creds(personality_creds);
}
/* same numerical values with corresponding REQ_F_*, safe to copy */
req->flags |= sqe_flags & (IOSQE_IO_DRAIN|IOSQE_IO_HARDLINK|
IOSQE_ASYNC);
@ -4646,6 +4660,8 @@ static bool io_submit_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe,
err_req:
io_cqring_add_event(req, ret);
io_double_put_req(req);
if (old_creds)
revert_creds(old_creds);
return false;
}
@ -4706,6 +4722,8 @@ static bool io_submit_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe,
}
}
if (old_creds)
revert_creds(old_creds);
return true;
}

7
include/uapi/linux/io_uring.h
View File

@ -40,7 +40,12 @@ struct io_uring_sqe {
};
__u64 user_data; /* data to be passed back at completion time */
union {
__u16 buf_index; /* index into fixed buffers, if used */
struct {
/* index into fixed buffers, if used */
__u16 buf_index;
/* personality to use, if used */
__u16 personality;
};
__u64 __pad2[3];
};
};