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ANDROID: lkdtm/usercopy: Use __va_function to find proper vm_mmap address

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With CFI enabled compiler replacing the reference to vm_mmap
passed to copy_to_user with a pointer to the CFI jump table
in the module itself. So use the __va_function API for
finding the proper address of vm_mmap.

Bug: 166220312
Suggested-by: Sami Tolvanen <samitolvanen@google.com>
Change-Id: Id5bd96cc9bfa1aa99f34bd4785792e0a4eeae5b1
Git-commit: 33752ec915fb9dcccfe3afe4c4df4e032a0d823f
Git-repo: https://android.googlesource.com/kernel/common/
Signed-off-by: Prasad Sodagudi <psodagud@codeaurora.org>
This commit is contained in:
Prasad Sodagudi 2020-09-15 10:07:13 -07:00
commit 062642e76e
1 changed files with 1 additions and 1 deletions
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2
drivers/misc/lkdtm/usercopy.c
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@ -314,7 +314,7 @@ void lkdtm_USERCOPY_KERNEL(void)
pr_info("attempting bad copy_to_user from kernel text: %px\n",
vm_mmap);
if (copy_to_user((void __user *)user_addr, vm_mmap,
if (copy_to_user((void __user *)user_addr, __va_function(vm_mmap),
unconst + PAGE_SIZE)) {
pr_warn("copy_to_user failed, but lacked Oops\n");
goto free_user;