From: Ming Lei <ming.lei@redhat.com> mainline inclusion from mainline-v6.6-rc2 commit 528ce6781726e022bc5dc84034360e6e8f1b89bd category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/ICJPON CVE: NA Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i... -------------------------------- Retain top 8bits of uring_cmd flags for kernel internal use, so that we can move IORING_URING_CMD_POLLED out of uapi header. Reviewed-by: Gabriel Krisman Bertazi <krisman@suse.de> Reviewed-by: Anuj Gupta <anuj20.g@samsung.com> Signed-off-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Yifan Qiao <qiaoyifan4@huawei.com> Signed-off-by: Long Li <leo.lilong@huawei.com> --- include/linux/io_uring.h | 3 +++ include/uapi/linux/io_uring.h | 5 ++--- io_uring/io_uring.c | 3 +++ io_uring/uring_cmd.c | 2 +- 4 files changed, 9 insertions(+), 4 deletions(-) diff --git a/include/linux/io_uring.h b/include/linux/io_uring.h index 108cffa3ae5b..4ed59118a74c 100644 --- a/include/linux/io_uring.h +++ b/include/linux/io_uring.h @@ -22,6 +22,9 @@ enum io_uring_cmd_flags { IO_URING_F_IOPOLL = (1 << 10), }; +/* only top 8 bits of sqe->uring_cmd_flags for kernel internal use */ +#define IORING_URING_CMD_POLLED (1U << 31) + struct io_uring_cmd { struct file *file; const struct io_uring_sqe *sqe; diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h index 8e61f8b7c2ce..de77ad08b123 100644 --- a/include/uapi/linux/io_uring.h +++ b/include/uapi/linux/io_uring.h @@ -246,13 +246,12 @@ enum io_uring_op { }; /* - * sqe->uring_cmd_flags + * sqe->uring_cmd_flags top 8bits aren't available for userspace * IORING_URING_CMD_FIXED use registered buffer; pass this flag * along with setting sqe->buf_index. - * IORING_URING_CMD_POLLED driver use only */ #define IORING_URING_CMD_FIXED (1U << 0) -#define IORING_URING_CMD_POLLED (1U << 31) +#define IORING_URING_CMD_MASK IORING_URING_CMD_FIXED /* diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c index 8b15e9dc340f..489ed84b39b8 100644 --- a/io_uring/io_uring.c +++ b/io_uring/io_uring.c @@ -4807,6 +4807,9 @@ static int __init io_uring_init(void) BUILD_BUG_ON(sizeof(atomic_t) != sizeof(u32)); + /* top 8bits are for internal use */ + BUILD_BUG_ON((IORING_URING_CMD_MASK & 0xff000000) != 0); + io_uring_optable_init(); /* diff --git a/io_uring/uring_cmd.c b/io_uring/uring_cmd.c index 2cbd1c24414c..15eeb8cdf2d0 100644 --- a/io_uring/uring_cmd.c +++ b/io_uring/uring_cmd.c @@ -91,7 +91,7 @@ int io_uring_cmd_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) return -EINVAL; ioucmd->flags = READ_ONCE(sqe->uring_cmd_flags); - if (ioucmd->flags & ~IORING_URING_CMD_FIXED) + if (ioucmd->flags & ~IORING_URING_CMD_MASK) return -EINVAL; if (ioucmd->flags & IORING_URING_CMD_FIXED) { -- 2.39.2