[PATCH v11 39/44] sg: add mmap_sz tracking

[Douglas Gilbert <dgilbert@interlog.com>]

Track mmap_sz from prior mmap(2) call, per sg file descriptor. Also
reset this value whenever munmap(2) is called. Fail SG_FLAG_MMAP_IO
uses if mmap(2) hasn't been called or the memory associated with it
is not large enough for the current request.

Signed-off-by: Douglas Gilbert <dgilbert@interlog.com>
---
 drivers/scsi/sg.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
index b95eb87a3c43..cba1db278775 100644
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -232,6 +232,7 @@ struct sg_fd {		/* holds the state of a file descriptor */
 	atomic_t waiting;	/* number of requests awaiting receive */
 	atomic_t req_cnt;	/* number of requests */
 	int sgat_elem_sz;	/* initialized to scatter_elem_sz */
+	int mmap_sz;		/* byte size of previous mmap() call */
 	unsigned long ffd_bm[1];	/* see SG_FFD_* defines above */
 	pid_t tid;		/* thread id when opened */
 	u8 next_cmd_len;	/* 0: automatic, >0: use on next write() */
@@ -725,10 +726,14 @@ sg_write(struct file *filp, const char __user *p, size_t count, loff_t *ppos)
 static inline int
 sg_chk_mmap(struct sg_fd *sfp, int rq_flags, int len)
 {
+	if (!test_bit(SG_FFD_MMAP_CALLED, sfp->ffd_bm))
+		return -EBADFD;
 	if (atomic_read(&sfp->submitted) > 0)
 		return -EBUSY;  /* already active requests on fd */
 	if (len > sfp->rsv_srp->sgat_h.buflen)
 		return -ENOMEM; /* MMAP_IO size must fit in reserve */
+	if (unlikely(len > sfp->mmap_sz))
+		return -ENOMEM; /* MMAP_IO size can't exceed mmap() size */
 	if (rq_flags & SG_FLAG_DIRECT_IO)
 		return -EINVAL; /* not both MMAP_IO and DIRECT_IO */
 	return 0;
@@ -2262,6 +2267,8 @@ sg_vma_close(struct vm_area_struct *vma)
 		pr_warn("%s: sfp null\n", __func__);
 		return;
 	}
+	sfp->mmap_sz = 0;
+	clear_bit(SG_FFD_MMAP_CALLED, sfp->ffd_bm);
 	kref_put(&sfp->f_ref, sg_remove_sfp); /* get in: sg_vma_open() */
 }
 
@@ -2383,6 +2390,7 @@ sg_mmap(struct file *filp, struct vm_area_struct *vma)
 			goto fini;
 		}
 	}
+	sfp->mmap_sz = req_sz;
 	vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
 	vma->vm_private_data = sfp;
 	vma->vm_ops = &sg_mmap_vm_ops;
@@ -4056,8 +4064,7 @@ sg_proc_debug_fd(struct sg_fd *fp, char *obp, int len, unsigned long idx)
 		       (int)test_bit(SG_FFD_FORCE_PACKID, fp->ffd_bm),
 		       (int)test_bit(SG_FFD_KEEP_ORPHAN, fp->ffd_bm),
 		       fp->ffd_bm[0]);
-	n += scnprintf(obp + n, len - n, "   mmap_called=%d\n",
-		       test_bit(SG_FFD_MMAP_CALLED, fp->ffd_bm));
+	n += scnprintf(obp + n, len - n, "   mmap_sz=%d\n", fp->mmap_sz);
 	n += scnprintf(obp + n, len - n,
 		       "   submitted=%d waiting=%d   open thr_id=%d\n",
 		       atomic_read(&fp->submitted),
-- 
2.25.1