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8 Commits

Author SHA1 Message Date
Christopher Ferris 4ae266ccbd Add indicator that an elf is memory backed. 
Modify the unwinder library to indicate that at least one of the stack
frames contains an elf file that is unreadable.

Modify debuggerd to display a note about the unreadable frame and a possible
way to fix it.

Bug: 129769339

Test: New unit tests pass.
Test: Ran an app that crashes and has an unreadable file and verified the
Test: message is displayed. Then setenforce 0 and verify the message is
Test: not displayed.
Change-Id: Ibc4fe1d117e9b5840290454e90914ddc698d3cc2
 2019-04-18 15:37:52 -07:00
Christopher Ferris 7813345faa Add BuildId to frame information. 
Update debuggerd to print BuildId information by default.

Bug: 120975492

Test: New unit tests pass.
Test: debuggerd -b <PID> shows build id information.
Test: tombstones include build id information.
Change-Id: I019b031113d0b77385516223c63455b868924440
 2019-03-26 08:04:40 -07:00
Christopher Ferris 60eb19795b Replace libbacktrace with libunwindstack directly. 
Small modifications to the dump_stack method and added unit tests to
verify the output.

Bug: 120606663

Test: Unit tests pass, debuggerd run on processes on target.
Change-Id: Id385a915b751abda3dd6baebed6c3ce498c3bf6e
 2019-01-29 17:57:14 -08:00
Josh Gao 2b2ae0c88e crash_dump: fork a copy of the target's address space. 
Reduce the amount of time that a process remains paused by pausing its
threads, fetching their registers, and then performing unwinding on a
copy of its address space. This also works around a kernel change
that's in 4.9 that prevents ptrace from reading memory of processes
that we don't have immediate permissions to ptrace (even if we
previously ptraced them).

Bug: http://b/62112103
Bug: http://b/63989615
Test: treehugger
Change-Id: I7b9cc5dd8f54a354bc61f1bda0d2b7a8a55733c4
 2017-12-15 14:11:12 -08:00
Josh Gao c3706668c6 libdebuggerd: cleanup. 
Move libdebuggerd headers into their own directory for namespacing,
move some includes to the top of their implementing files, delete some
dead code.

Test: mma, treehugger
Change-Id: Ie4c44e32e2ab3bc678092899d257fd4ed634aa34
 2017-08-29 15:18:46 -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
Josh Gao e1aa0ca58a debuggerd_handler: implement missing fallback functionality. 
Allow the fallback implementation to dump traces and create tombstones
in seccomped processes.

Bug: http://b/35858739
Test: debuggerd -b `pidof media.codec`; killall -ABRT media.codec
Change-Id: I381b283de39a66d8900f1c320d32497d6f2b4ec4
 2017-03-09 11:26:05 -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