From: Jens Wiklander <jens.wiklander@xxxxxxxxxx>
commit 573ae4f13f630d6660008f1974c0a8a29c30e18a upstream.
With special lengths supplied by user space, register_shm_helper() has
an integer overflow when calculating the number of pages covered by a
supplied user space memory region.
This causes internal_get_user_pages_fast() a helper function of
pin_user_pages_fast() to do a NULL pointer dereference:
Unable to handle kernel NULL pointer dereference at virtual address 0000000000000010
Modules linked in:
CPU: 1 PID: 173 Comm: optee_example_a Not tainted 5.19.0 #11
Hardware name: QEMU QEMU Virtual Machine, BIOS 0.0.0 02/06/2015
pc : internal_get_user_pages_fast+0x474/0xa80
Call trace:
internal_get_user_pages_fast+0x474/0xa80
pin_user_pages_fast+0x24/0x4c
register_shm_helper+0x194/0x330
tee_shm_register_user_buf+0x78/0x120
tee_ioctl+0xd0/0x11a0
__arm64_sys_ioctl+0xa8/0xec
invoke_syscall+0x48/0x114
Fix this by adding an an explicit call to access_ok() in
tee_shm_register_user_buf() to catch an invalid user space address
early.
Fixes: 033ddf12bcf5 ("tee: add register user memory")
Cc: stable@xxxxxxxxxxxxxxx
Reported-by: Nimish Mishra <neelam.nimish@xxxxxxxxx>
Reported-by: Anirban Chakraborty <ch.anirban00727@xxxxxxxxx>
Reported-by: Debdeep Mukhopadhyay <debdeep.mukhopadhyay@xxxxxxxxx>
Suggested-by: Jerome Forissier <jerome.forissier@xxxxxxxxxx>
Signed-off-by: Jens Wiklander <jens.wiklander@xxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/tee/tee_shm.c | 3 +++
1 file changed, 3 insertions(+)
--- a/drivers/tee/tee_shm.c
+++ b/drivers/tee/tee_shm.c
@@ -311,6 +311,9 @@ struct tee_shm *tee_shm_register_user_bu
void *ret;
int id;
+ if (!access_ok((void __user *)addr, length))
+ return ERR_PTR(-EFAULT);
+
mutex_lock(&teedev->mutex);
id = idr_alloc(&teedev->idr, NULL, 1, 0, GFP_KERNEL);
mutex_unlock(&teedev->mutex);
