tetragon: Refactor program/map loader to use directory hierarchy #2128
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We provide sysfs bpf tetragon root path as pinPathPrefix to the MapLoad's Load function, so we can provide pin path to possible inner maps that get loaded. We are going to introduce new sysfs hierarchy in following changes, where each map can be placed in specific directory, so the sysfs root is no longer enough. Passing map's PinPath through Load's function directly. Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Adding map type fields that specify how the map is shared and when it's placed in the sysfs hierarchy. MapTypeGlobal - under sysfs root, shared with everyone MapTypePolicy - under policy dir, shared within policy MapTypeSensor - under sensor dir, shared within sensor MapTypeProgram - under program dir, program specific MapTypeGlobal -> /sys/fs/bpf/tetragon/map-1 MapTypePolicy -> /sys/fs/bpf/tetragon/policy-name/map-2 MapTypeSensor -> /sys/fs/bpf/tetragon/policy-name/sensor-1/map-3 MapTypeProgram -> /sys/fs/bpf/tetragon/policy-name/sensor-1/prog-1/map-4 Adding just types at the moment, implementation is coming in following changes. Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Creating sensor directory hierarchy on sensor loading. When sensor is loading we: - create directory sysfs hierarchy for each program in the sensor - assign PinPath for each pinned map in the sensor Adding PinName to Program object to hold sysfs program name, at the moment it's initialized same way as the PinPath, but PinPath is changed when the sensor is loaded to be relative program path from sysfs tetragon root. Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Moving execve_calls map under execve program directory, because it's specific to the program. The rest of the base sensor maps are kept as global, because they are shared by all the other sensors. Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Moving generickprobe sensor maps under new hierarchy: per program maps: argfilter_maps addr4lpm_maps addr6lpm_maps string_prefix_maps string_postfix_maps kprobe_calls filter_map tg_mb_sel_opts tg_mb_paths stack_trace_map config_map retkprobe_calls override_tasks per sensor maps: fdinstall_map retprobe_map process_call_heap socktrack_map ratelimit_map Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Moving generictracepoint sensor maps under new hierarchy. per program maps: tp_calls filter_map argfilter_maps addr4lpm_maps addr6lpm_maps string_prefix_maps string_postfix_maps tg_mb_paths tg_mb_sel_opts per sensor maps: fdinstall_map Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Moving genericuprobe sensor maps under new hierarchy. per program maps: config_map uprobe_calls filter_map tg_mb_sel_opts Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Moving genericlsm sensor maps under new hierarchy: per program maps: config_map lsm_calls filter_map tg_mb_sel_opts tg_mb_paths argfilter_maps addr4lpm_maps addr6lpm_maps string_maps_%d string_prefix_maps string_postfix_maps process_call_heap Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Change the generickprobe sensor pin path for programs under sysfs hierarchy. Now the program pin looks like below, for multi kprobes: sigkilltest/gkp-sensor-1/multi_kprobe/prog sigkilltest/gkp-sensor-1/multi_retkprobe/prog for regular kprobes: sigkilltest/gkp-sensor-1/__x64_sys_lseek/prog sigkilltest/gkp-sensor-1/__x64_sys_lseek_return/prog Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Change the generictracepoint sensor pin path for programs under sysfs hierarchy. Now the program pin looks like below: raw-syscalls/gtp-sensor-1/raw_syscalls:sys_enter/prog Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Change the genericuprobe sensor pin path for programs under sysfs hierarchy. Now the program pin looks like below: uprobe/gup-sensor-1/0-readline/prog uprobe/gup-sensor-1/1-main/prog Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Change the genericlsm sensor pin path for programs under sysfs hierarchy. Now the program pin looks like below: lsm-file-open/glsm-sensor-1/file_open/prog Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Moving enforcer sensor maps under new hierarchy. per policy maps: enforcer_data Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Removing MapBuilderPin, because it's no longer needed and removing the pin argument from mapBuilder function. Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Policy name is provided by tracing-policy/user. It already has some restrictions, but let's add at least substitute for '/' characters for '_' to ensure the path is not mangled. Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Adjusting linkPinPath for new hierarchy to use program's PinPath directory with 'link' file name. Plus '_override' suffix for override link. Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Adding policy argument to SensorBuilder function so it's passed to the Sensor object. Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Add tests for the map builders, will be likely extended. Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Adding tests for map max entries setup. Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Adding some notes in map.go header about maps usage. Signed-off-by: Jiri Olsa <jolsa@kernel.org>
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kkourt
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Sep 10, 2024
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Adding hierarchy to tetragon's program and maps, like (with kprobe multi):
or with standard kprobes: