Although ever present, an increased regression introduced with
commit b6bee33182 (liblog: logd:
support logd.timestamp = monotonic).
A signal handler can interrupt in locked context, if log is written
in the signal handler, we are in deadlock. To reduce the contention
and chances for this problem separate out timestamp lock from is
loggable lock to reduce contention situations. Provide a best-guess
response if lock would fail in timestamp path.
Use a common lock() inline within each module, with a comment speaking
to the issues surrounding calling a function that has a mutex within
a signal handler.
ToDo: Hold off signals temporarily in mainline, restart when unblock.
Can not use pthread_sigmask(SIG_BLOCK,,) as it breaks AtCmd.
Signed-off-by: Mark Salyzyn <salyzyn@google.com>
Bug: 25563384
Change-Id: I47e2c87c988c3e359eb9eef129c6a3a08e9eedef
Although ever present, an increased regression introduced with
commit b6bee33182 (liblog: logd:
support logd.timestamp = monotonic).
A signal handler can interrupt in locked context, if log is written
in the signal handler, we are in deadlock. Block signals while we
are locked. Separate out timestamp lock from is loggable lock to
reduce contention situations. Provide a best-guess response if
lock would fail in timestamp path.
Bug: 25563384
Change-Id: I6dccd6b99ebace1c473c03a785a35c63ed5c6a8a
We use this specifically in situations where we expect to read
an object from a Parcel, but fail because the object is null.
Bug: 25617251
Change-Id: Id0b6118b19a932998b5028e30dc15d70e4d7f9c3
Add the following mount options to the /proc filesystem:
hidepid=2,gid=3009
This change blocks /proc access unless you're in group 3009
(aka AID_READPROC).
Please see
https://github.com/torvalds/linux/blob/master/Documentation/filesystems/proc.txt
for documentation on the hidepid option.
hidepid=2 is preferred over hidepid=1 since it leaks less information
and doesn't generate SELinux ptrace denials when trying to access
/proc without being in the proper group.
Add AID_READPROC to processes which need to access /proc entries for
other UIDs.
Bug: 23310674
Change-Id: I22bb55ff7b80ff722945e224845215196f09dafa
- '-v epoch' prints seconds since Jan 1 1970
- '-v monotonic' print cpu seconds since start of device
- '-T sssss.mmm...' as alternate tail time format
NB: monotonic is a best estimate and may be out by a few ms
given the synchronization source clue accuracy.
Bug: 23668800
Change-Id: Ieb924b6d3817669c7e53beb9c970fb626eaad460
Arguably we should migrate to std::shared_ptr
but for now make std::vector<sp<>> a bit less
horrible
Change-Id: Ia458a2daff0b656b2f3310b3ea100565ec844c69
Add methods to BinderWrapper for getting the caller's UID
and PID while in a transaction.
Bug: 24988639
Change-Id: Ibd711fc6b3d83623d4bb1060838c65aaef30d76e
The ZipWriter implementation exposes a stateful interface that allows
bytes of data to be streamed in as they arrive. ZipEntries can be
compressed and/or aligned on a 32-bit boundary for mmapping at runtime.
Change-Id: I43ac9e661aa5022f00d9e12b247c4314d61c441c
FileMaps should be movable, thereby not requiring them to be only used
with a unique_ptr as they currently are.
Change-Id: I0fb8013bf398a2ced5420d85ba888c2a7fc5a496
