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path: root/drivers/misc/lkdtm/usercopy.c
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Diffstat (limited to 'drivers/misc/lkdtm/usercopy.c')
-rw-r--r--drivers/misc/lkdtm/usercopy.c15
1 files changed, 0 insertions, 15 deletions
diff --git a/drivers/misc/lkdtm/usercopy.c b/drivers/misc/lkdtm/usercopy.c
index b833367a45d0..109e8d4302c1 100644
--- a/drivers/misc/lkdtm/usercopy.c
+++ b/drivers/misc/lkdtm/usercopy.c
@@ -325,21 +325,6 @@ free_user:
vm_munmap(user_addr, PAGE_SIZE);
}
-void lkdtm_USERCOPY_KERNEL_DS(void)
-{
- char __user *user_ptr =
- (char __user *)(0xFUL << (sizeof(unsigned long) * 8 - 4));
- mm_segment_t old_fs = get_fs();
- char buf[10] = {0};
-
- pr_info("attempting copy_to_user() to noncanonical address: %px\n",
- user_ptr);
- set_fs(KERNEL_DS);
- if (copy_to_user(user_ptr, buf, sizeof(buf)) == 0)
- pr_err("copy_to_user() to noncanonical address succeeded!?\n");
- set_fs(old_fs);
-}
-
void __init lkdtm_usercopy_init(void)
{
/* Prepare cache that lacks SLAB_USERCOPY flag. */