Author: imp
Date: Mon Apr 13 21:04:33 2020
New Revision: 359902
URL: https://svnweb.freebsd.org/changeset/base/359902
Log:
Checks here against useracc are not useful and are racy.
copyin/copyout are sufficient to guard against bad addresses. They will return
EFAULT if the user is up to no good (by choice or ignorance). There's no point
in checking, since it doesn't even improve the error messages.
Noticed by: jhb
Reviewed by: brooks, jhb
Modified:
head/sys/cam/scsi/scsi_pass.c
Modified: head/sys/cam/scsi/scsi_pass.c
==============================================================================
--- head/sys/cam/scsi/scsi_pass.c Mon Apr 13 21:03:30 2020
(r359901)
+++ head/sys/cam/scsi/scsi_pass.c Mon Apr 13 21:04:33 2020
(r359902)
@@ -1232,15 +1232,6 @@ passcopysglist(struct cam_periph *periph, struct pass_
user_watermark += len_to_copy;
kern_watermark += len_to_copy;
- if (!useracc(user_ptr, len_to_copy,
- (direction == CAM_DIR_IN) ? VM_PROT_WRITE : VM_PROT_READ)) {
- xpt_print(periph->path, "%s: unable to access user "
- "S/G list element %p len %zu\n", __func__,
- user_ptr, len_to_copy);
- error = EFAULT;
- goto bailout;
- }
-
if (direction == CAM_DIR_IN) {
error = copyout(kern_ptr, user_ptr, len_to_copy);
if (error != 0) {
@@ -1445,20 +1436,6 @@ passmemsetup(struct cam_periph *periph, struct pass_io
if (io_req->lengths[i] == 0)
continue;
- /*
- * Make sure that the user's buffer is accessible
- * to that process.
- */
- if (!useracc(io_req->user_bufs[i], io_req->lengths[i],
- (io_req->dirs[i] == CAM_DIR_IN) ? VM_PROT_WRITE :
- VM_PROT_READ)) {
- xpt_print(periph->path, "%s: user address %p "
- "length %u is not accessible\n", __func__,
- io_req->user_bufs[i], io_req->lengths[i]);
- error = EFAULT;
- goto bailout;
- }
-
tmp_buf = malloc(lengths[i], M_SCSIPASS,
M_WAITOK | M_ZERO);
io_req->kern_bufs[i] = tmp_buf;
@@ -1560,13 +1537,6 @@ passmemsetup(struct cam_periph *periph, struct pass_io
io_req->flags |= PASS_IO_USER_SEG_MALLOC;
} else
io_req->user_segptr = io_req->user_segs;
-
- if (!useracc(*data_ptrs[0], sg_length, VM_PROT_READ)) {
- xpt_print(periph->path, "%s: unable to access user "
- "S/G list at %p\n", __func__, *data_ptrs[0]);
- error = EFAULT;
- goto bailout;
- }
error = copyin(*data_ptrs[0], io_req->user_segptr, sg_length);
if (error != 0) {
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