This patch is a part of a series that extends arm64 kernel ABI to allow to pass tagged user pointers (with the top byte set to something else other than 0x00) as syscall arguments.
check_mem_type() uses provided user pointers for vma lookups (via __check_mem_type()), which can only by done with untagged pointers.
Untag user pointers in this function.
Signed-off-by: Andrey Konovalov andreyknvl@google.com --- drivers/tee/optee/call.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/tee/optee/call.c b/drivers/tee/optee/call.c index a5afbe6dee68..e3be20264092 100644 --- a/drivers/tee/optee/call.c +++ b/drivers/tee/optee/call.c @@ -563,6 +563,7 @@ static int check_mem_type(unsigned long start, size_t num_pages) int rc;
down_read(&mm->mmap_sem); + start = untagged_addr(start); rc = __check_mem_type(find_vma(mm, start), start + num_pages * PAGE_SIZE); up_read(&mm->mmap_sem);