mirror of https://github.com/torvalds/linux.git
4d756095d3
This change allows the uprobe consumer to behave as session which means that 'handler' and 'ret_handler' callbacks are connected in a way that allows to: - control execution of 'ret_handler' from 'handler' callback - share data between 'handler' and 'ret_handler' callbacks The session concept fits to our common use case where we do filtering on entry uprobe and based on the result we decide to run the return uprobe (or not). It's also convenient to share the data between session callbacks. To achive this we are adding new return value the uprobe consumer can return from 'handler' callback: UPROBE_HANDLER_IGNORE - Ignore 'ret_handler' callback for this consumer. And store cookie and pass it to 'ret_handler' when consumer has both 'handler' and 'ret_handler' callbacks defined. We store shared data in the return_consumer object array as part of the return_instance object. This way the handle_uretprobe_chain can find related return_consumer and its shared data. We also store entry handler return value, for cases when there are multiple consumers on single uprobe and some of them are ignored and some of them not, in which case the return probe gets installed and we need to have a way to find out which consumer needs to be ignored. The tricky part is when consumer is registered 'after' the uprobe entry handler is hit. In such case this consumer's 'ret_handler' gets executed as well, but it won't have the proper data pointer set, so we can filter it out. Suggested-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Jiri Olsa <jolsa@kernel.org> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Oleg Nesterov <oleg@redhat.com> Acked-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/r/20241018202252.693462-3-jolsa@kernel.org |
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