first_stage_mount: mount point must be canonical path
Ban weird paths such as /../system or //vendor in first stage mount.
Add utility function fs_mgr_create_canonical_mount_point() that:
* mkdir(mount_point) to ensure mount_point's existence
* Test that realpath(mount_point) =?= mount_point
Bug: 188898525
Test: Presubmit
Test: Boot CF
Change-Id: Iaf2ec52701277f26cc81f3e15a47b6083a788334
Merged-In: Iaf2ec52701277f26cc81f3e15a47b6083a788334
(cherry picked from commit 3431d52675f25020b279c9fbcda6b8648f9cf67b)
3 files changed