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platform_system_core
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Author SHA1 Message Date
Josh Gao 3e76ecaf80 crash_dump: during early boot, output to kmsg on userdebug. 
Crashes that happen before tombstoned is running are extremely hard to
diagnose, because tombstones aren't written to disk, and the window of
opportunity to get logs via `adb logcat` is small (potentially
nonexistent).

Solve this by adding a world-writable /dev/kmsg_debug on userdebug
builds, and writing to it in addition to logcat when tombstoned hasn't
started yet.

Bug: http://b/36574794
Test: stop tombstoned; crasher; dmesg
Change-Id: I46ba2dd67c188be74bd931f8a5536b6342d537f2
 2017-08-11 13:29:38 -07:00
Jeff Vander Stoep 5fdc4cc746 Revert "crash_dump: during early boot, output to kmsg on userdebug." 
This reverts commit bf2dd48241.

Addresses:
avc: denied { relabelto } for name="kmsg_debug" dev="tmpfs" ino=10642
scontext=u:r:init:s0 tcontext=u:object_r:device:s0 tclass=chr_file

Bug: 62101480, 35197529
Test: build and boot device. Verify selinux denial no longer occurs.
Change-Id: I28ce16f50eec20ef15c1721f41b66f22a84e7cca
 2017-06-23 13:37:54 -07:00
Josh Gao bf2dd48241 crash_dump: during early boot, output to kmsg on userdebug. 
Crashes that happen before tombstoned is running are extremely hard to
diagnose, because tombstones aren't written to disk, and the window of
opportunity to get logs via `adb logcat` is small (potentially
nonexistent).

Solve this by adding a world-writable /dev/kmsg_debug on userdebug
builds, and writing to it in addition to logcat when tombstoned hasn't
started yet.

Bug: http://b/36574794
Test: stop tombstoned; crasher; dmesg
Change-Id: Ib22c02a002afb602933155fb2c9b7a8abbe9ed38
 2017-04-06 15:00:52 -07:00
Josh Gao 57f58f8e4a crash_dump: fetch process/thread names before dropping privileges. 
Processes that don't have dumpable set to 1 cannot have their
process/thread names read by processes that don't have all of their
capabilities. Fetch these names in crash_dump before dropping
privileges.

Bug: http://b/36237221
Test: debuggerd_test
Test: debuggerd -b `pidof android.hardware.bluetooth@1.0-service`
Change-Id: I174769e7b3c1ea9f11f9c8cbdff83028a4225783
 2017-03-15 23:30:14 -07:00
Chenjie Luo 97258aad8a Define _LOG as a weak symbol. 
So _LOG could be overridden by customized logging
implementations in non-Android systems.

Bug: 35919515
Test: Test on device
Change-Id: I0885c15353c0b1bf66f6f156e7f502f326b85d57
 2017-03-06 15:04:32 -08:00
Josh Gao cbe70cb0a8 debuggerd: advance our amazing bet. 
Remove debuggerd in favor of a helper process that gets execed by
crashing processes.

Bug: http://b/30705528
Test: debuggerd_test
Change-Id: I9906c69473989cbf7fe5ea6cccf9a9c563d75906
 2017-01-17 13:57:57 -08:00