Introduce GDB interface #218
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This small ELF parser contains just the bare minimum functions so we can load ELF sections without the use of any external library. This module also doesn't allocate dynamic memory. Signed-off-by: Giuliano Belinassi <[email protected]>
Livepatch load works but it doesn't modify the addresses because there is nothing to interpret the insn_queue. Signed-off-by: Giuliano Belinassi <[email protected]>
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This commit adds a insnq_interp in libpulp side as a way to trigger a livepatch without the `ulp` tool. This is useful for debugging libpulp as for example to use it in valgrind, since we can't run it under addrsan. Signed-off-by: Giuliano Belinassi <[email protected]>
The gdb interface should be used for debugging libpulp, so applications may not want this exposed. To enable it, build with ``` configure --enable-gdb-interface ``` Signed-off-by: Giuliano Belinassi <[email protected]>
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Libpulp requires the
ulptool in order to load and apply livepatches, using theptracemechanism for that. This introduces a series of issues while debugging the application, such as unable to livepatch an application lauched under gdb, and unable to livepatch programs being analyzed under valgrind's memcheck.This PR introduces a gdb interface to it. To build it, configure libpulp with:
and livepatches can be applied by called the functions:
gdb_ulp_apply("<path-to-livepatch>")gdb_ulp_revert("<path-to-livepatch>")Such functions can also be called from the program itself by calling
dlsym(NULL, "gdb_ulp_apply")to get the pointer to the function and then calling it.