函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:fs\read_write.c Create Date:2022-07-29 10:31:24
Last Modify:2020-03-18 10:18:51 Copyright©Brick
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函数名称：w_copy_check_uvector() - Copy an array of &struct iovec from userspace* into the kernel and check that it is valid.*@type: One of %CHECK_IOVEC_ONLY, %READ, or %WRITE.*@uvector: Pointer to the userspace array.

函数原型：ssize_t rw_copy_check_uvector(int type, const struct iovec __user *uvector, unsigned long nr_segs, unsigned long fast_segs, struct iovec *fast_pointer, struct iovec **ret_pointer)

返回类型：ssize_t

参数：

类型参数名称
inttype
const struct iovec __user *uvector
unsigned longnr_segs
unsigned longfast_segs
struct iovec *fast_pointer
struct iovec **ret_pointer
771  iov等于fast_pointer
778  如果nr_segs恒等于0则
779  ret等于0
780  转到:out
787  如果nr_segs大于UIO_MAXIOV则
788  ret等于负EINVAL
789  转到:out
791  如果nr_segs大于fast_segs则
792  iov等于分配数组内存
793  如果(iov == NULL)则
794  ret等于负ENOMEM
795  转到:out
798  如果copy_from_user(iov, uvector, nr_segs * uvector的长度)则
799  ret等于负EFAULT
800  转到:out
812  ret等于0
813  以seg小于nr_segs循环
814  __user乘buf等于 BSD uses caddr_t (1003.1g requires void *)
815  len等于 Must be size_t (1003.1g)
819  如果len小于0则
820  ret等于负EINVAL
821  转到:out
823  如果type大于等于0且此条件成立可能性小(为编译器优化)(!access_ok - Checks if a user space pointer is valid*@addr: User space pointer to start of block to check*@size: Size of block to check* Context: User context only. This function may sleep if pagefaults are* enabled.(buf, len))则
825  ret等于负EFAULT
826  转到:out
828  如果len大于MAX_RW_COUNT减ret则
829  len等于MAX_RW_COUNT减ret
830  Must be size_t (1003.1g) 等于len
832  ret加等于len
834  out :
835  ret_pointer等于iov
836  返回:ret
调用者
名称描述
import_iovecmport_iovec() - Copy an array of &struct iovec from userspace* into the kernel, check that it is valid, and initialize a new* &struct iov_iter iterator to access it.*@type: One of %READ or %WRITE.*@uvector: Pointer to the userspace array.
process_vm_rwprocess_vm_rw - check iovecs before calling core routine*@pid: PID of process to read/write from/to*@lvec: iovec array specifying where to copy to/from locally*@liovcnt: size of lvec array*@rvec: iovec array specifying where to copy to/from in the other