[PATCH v13 18/20] tee/optee, arm64: untag user pointers in check_mem_type
From: Andrey Konovalov <hidden>
Date: 2019-03-20 14:52:47
Also in:
bpf, linux-arch, linux-kselftest, linux-media, linux-mm, lkml
Subsystem:
op-tee driver, tee subsystem, the rest · Maintainers:
Jens Wiklander, Linus Torvalds
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 <redacted> --- 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);
--
2.21.0.225.g810b269d1ac-goog