Non-static binaries

Question

Non-static binaries

beorn- opened this issue 4 years ago · comments

Aurélien "beorn" Rougemont commented 4 years ago

Currently, when a binary crashes and is detected as C binary i have found a few issues :

*.so libs are not sent along with the binary
debugging symbols table are not sent too. usually they are available in separate files such as /usr/lib/debug/.build-id/59/b262a6710ac89c3b4e53cccd6387f4b56c7d0c.debug

Make next to impossible for the gdb instance to work. Especially when the rcoredumpd runs on FreeBSD and the crashing binary runs on a linux based system

Romain Baugue · Answer 1 · Wed Sep 16 2020 04:15:29 GMT+0800 (China Standard Time)

For debug symbols: https://sourceware.org/gdb/onlinedocs/gdb/Separate-Debug-Files.html

Romain Baugue · Answer 2 · Wed Sep 16 2020 04:16:05 GMT+0800 (China Standard Time)

GDB command to run (example): gdb ./run/store/executables/6cee5fd5cb624fd66a115f8ed58cff6ef4a70da0 -ex "set sysroot /no/such/file" -ex "set solib-search-path ./run/store/links/6cee5fd5cb624fd66a115f8ed58cff6ef4a70da0:/lib:/usr/lib" -ex "core ./run/store/cores/bt5ndcil19le1bns8t00"

Romain Baugue · Answer 3 · Wed Sep 16 2020 04:17:09 GMT+0800 (China Standard Time)

The build id can be found in the .note.gnu.build-id section of an ELF file objdump -j .note.gnu.build-id -s /usr/bin/ls

Romain Baugue · Answer 4 · Wed Sep 16 2020 04:19:40 GMT+0800 (China Standard Time)

To load debug files in GDB set debug-file-directory <directory>

Romain Baugue · Answer 5 · Wed Sep 16 2020 04:20:32 GMT+0800 (China Standard Time)

TODO: change the copy & debug script for a script that download the full package of related files, ungzip it then run the debugger.