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habanalabs: Validate user address before mapping

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User address must be validated before driver performs address map.

Signed-off-by: Ofir Bitton <obitton@habana.ai>
Reviewed-by: Oded Gabbay <oded.gabbay@gmail.com>
Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>
This commit is contained in:
Ofir Bitton 2020-07-30 10:00:10 +03:00 committed by Oded Gabbay
parent f1aae40e8d
commit bf6d10963e
1 changed files with 14 additions and 2 deletions
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16
drivers/misc/habanalabs/common/command_buffer.c
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@ -10,6 +10,7 @@
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/genalloc.h>
static void cb_fini(struct hl_device *hdev, struct hl_cb *cb)
@ -300,7 +301,7 @@ int hl_cb_mmap(struct hl_fpriv *hpriv, struct vm_area_struct *vma)
struct hl_device *hdev = hpriv->hdev;
struct hl_cb *cb;
phys_addr_t address;
u32 handle;
u32 handle, user_cb_size;
int rc;
handle = vma->vm_pgoff;
@ -314,7 +315,8 @@ int hl_cb_mmap(struct hl_fpriv *hpriv, struct vm_area_struct *vma)
}
/* Validation check */
if ((vma->vm_end - vma->vm_start) != ALIGN(cb->size, PAGE_SIZE)) {
user_cb_size = vma->vm_end - vma->vm_start;
if (user_cb_size != ALIGN(cb->size, PAGE_SIZE)) {
dev_err(hdev->dev,
"CB mmap failed, mmap size 0x%lx != 0x%x cb size\n",
vma->vm_end - vma->vm_start, cb->size);
@ -322,6 +324,16 @@ int hl_cb_mmap(struct hl_fpriv *hpriv, struct vm_area_struct *vma)
goto put_cb;
}
if (!access_ok((void __user *) (uintptr_t) vma->vm_start,
user_cb_size)) {
dev_err(hdev->dev,
"user pointer is invalid - 0x%lx\n",
vma->vm_start);
rc = -EINVAL;
goto put_cb;
}
spin_lock(&cb->lock);
if (cb->mmap) {