Fixed this when I tested on internal, but failed to copy the fix over
when submitting to AOSP.
Bug: http://b/35070339
Test: `adb bugreport` on angler
Change-Id: Ib84d212e5f890958cd21f5c018fbc6f368138d1e
* changes:
debuggerd_handler: don't use clone(..., SIGCHLD, ...)
crash_dump: drop capabilities after we ptrace attach.
crash_dump: use /proc/<pid> fd to check tid process membership.
debuggerd_handler: raise ambient capset before execing.
Revert "Give crash_dump CAP_SYS_PTRACE."
Processes that handle SIGCHLD can race with the crash handler to wait
on the crash_dump process. Use clone flags that cause the forked
child's death to not be reported via SIGCHLD, and don't bail out of
dumping when waitpid returns ECHILD (in case another thread is already
in a waitpid(..., __WALL))
Note that the use of waitid was switched to waitpid, because waitid
doesn't support __WCLONE until kernel version 4.7.
Bug: none
Test: "debuggerd -b `pidof zygote64`" a few times (failed roughly 50%
of the time previously)
Change-Id: Ia41a26a61f13c6f9aa85c4c2f88aef8d279d35ad
Raise the ambient capability set to match CapEff so that crash_dump can
inherit all of the capabilities of the dumped process to be able to
ptrace. Note that selinux will prevent crash_dump from actually use
any of the capabilities.
Bug: http://b/34853272
Test: debuggerd -b `pidof system_server`
Test: debuggerd -b `pidof zygote`
Change-Id: I1fe69eff54c1c0a5b3ec63f6fa504b2681c47a88
We can't do an selinux transition when this is on.
Bug: http://b/34472671
Test: logcat -c; debuggerd `pidof media.codec`; logcat
Change-Id: Ie6c1832ab838df48879c32a86126862de9a15420
Actually exit when receiving a signal via kill(2) or raise(2) and
PR_GET_DUMPABLE is 0.
Bug: none
Test: /data/nativetest/debuggerd_test/debuggerd_test32
Test: /data/nativetest64/bionic-unit-tests/bionic-unit-tests --gtest_filter=pthread_DeathTest.pthread_mutex_lock_null_64
Change-Id: I833a2a34238129237bd9f953959ebda51d8d04d7
crash_dump is a dynamic executable that gets the default crash dumping
handlers set by the linker. Turn them off to prevent crash_dump from
dumping itself.
Bug: http://b/34472671
Test: inserted an abort into crash_dump
Change-Id: Ic9d708805ad47afbb2a9ff37e2ca059f23f421de
Occasionally, the pseudothread wouldn't exit in time after unlocking
the mutex to get crash_dump to proceed, resulting in spurious error
messages. Instead of using a mutex to emulate pthread_join, just
implement it correctly.
Bug: http://b/34472671
Test: debuggerd_test
Change-Id: I5c2658a84e9407ed8cc0ef2ad0fb648c388b7ad1
Remove debuggerd in favor of a helper process that gets execed by
crashing processes.
Bug: http://b/30705528
Test: debuggerd_test
Change-Id: I9906c69473989cbf7fe5ea6cccf9a9c563d75906
