If ashmem accessors are being called with a file descriptor that
belongs to anything other than ashmem, we need to stop it right
now so that they can fix the caller.
Bug: 26871259
Change-Id: Icf9aafc3631a80b9af6fe0fea03599d61e285d21
NB: We decided to not sniff for the constant saved __ashmem_rdev in
the early error path; requiring either the use of atomic operations,
or acquiring a lock to do it correctly. The heroics are not worth it.
Bug: 26871259
Change-Id: I46249838850ae32063eb5b7d08c731c5bb0fbf6b
- collect st_rdev on open, or when required, for /dev/ashmem.
- check in all cases if fd is a character device and matches rdev.
- requires that we have open, read and write access to /dev/ashmem
to check, assumption being that if we can not, then we have no
right playing with the associated misdirected file descriptor.
NB: ashmem libcutil library entry points can no longer be called in
signal context.
Bug: 26871259
Change-Id: I9a17e33317a9be795131473a51c16f761b5f7407
- sort header order and in groups
- remove all tabs, use only spaces
- use TEMP_FAILURE_RETRY in system calls
- preserve errno for -1 return
Bug: 26871259
Change-Id: I94fffbcaeba01fcc18a3ed07c02389c06c54d3b7
Initialize local variable to avoid syscall ioctl warning.
Change-Id: Ibad5b86cd799f147c71f182d654e61318e2ac15e
Origin-Change-Id: Iedf5b128ae1743f633d2821ac3e402942ad6642b
Signed-off-by: Jin Wei <wei.a.jin@intel.com>
Signed-off-by: Jian Luo <jian.luo@intel.com>
Signed-off-by: Bruce Beare <bruce.j.beare@intel.com>
Signed-off-by: Jack Ren <jack.ren@intel.com>
Author-tracking-BZ: 62797
This is needed by the MemoryFile changes in
https://android-git.corp.google.com/g/2714
where it is used to find out whether a file descriptor
refers to an ashmem region.
Mark Salyzyn