Em Wed, Aug 26, 2020 at 11:30:17PM +0200, Jiri Olsa escreveu:
> When validating kcore modules the do_validate_kcore_modules
> function checks on every kernel module dso against modules
> record. The __map__is_kmodule check is used to get only
> kernel module dso objects through.
>
> Currently the bpf images are slipping through the check and
> making the validation to fail, so report falls back from kcore
> usage to kallsyms.
>
> Adding __map__is_bpf_image check for bpf image and adding
> it to __map__is_kmodule check.
looks ok, applied to perf/urgent.
Thanks,
- Arnaldo
> Fixes: 3c29d4483e85 ("perf annotate: Add basic support for bpf_image")
> Signed-off-by: Jiri Olsa <[email protected]>
> ---
> tools/perf/util/machine.c | 6 ------
> tools/perf/util/map.c | 16 ++++++++++++++++
> tools/perf/util/map.h | 9 ++++++++-
> 3 files changed, 24 insertions(+), 7 deletions(-)
>
> diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
> index 208b813e00ea..85587de027a5 100644
> --- a/tools/perf/util/machine.c
> +++ b/tools/perf/util/machine.c
> @@ -736,12 +736,6 @@ int machine__process_switch_event(struct machine
> *machine __maybe_unused,
> return 0;
> }
>
> -static int is_bpf_image(const char *name)
> -{
> - return strncmp(name, "bpf_trampoline_", sizeof("bpf_trampoline_") - 1)
> == 0 ||
> - strncmp(name, "bpf_dispatcher_", sizeof("bpf_dispatcher_") - 1)
> == 0;
> -}
> -
> static int machine__process_ksymbol_register(struct machine *machine,
> union perf_event *event,
> struct perf_sample *sample
> __maybe_unused)
> diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
> index 1d7210804639..cc0faf8f1321 100644
> --- a/tools/perf/util/map.c
> +++ b/tools/perf/util/map.c
> @@ -267,6 +267,22 @@ bool __map__is_bpf_prog(const struct map *map)
> return name && (strstr(name, "bpf_prog_") == name);
> }
>
> +bool __map__is_bpf_image(const struct map *map)
> +{
> + const char *name;
> +
> + if (map->dso->binary_type == DSO_BINARY_TYPE__BPF_IMAGE)
> + return true;
> +
> + /*
> + * If PERF_RECORD_KSYMBOL is not included, the dso will not have
> + * type of DSO_BINARY_TYPE__BPF_IMAGE. In such cases, we can
> + * guess the type based on name.
> + */
> + name = map->dso->short_name;
> + return name && is_bpf_image(name);
> +}
> +
> bool __map__is_ool(const struct map *map)
> {
> return map->dso && map->dso->binary_type == DSO_BINARY_TYPE__OOL;
> diff --git a/tools/perf/util/map.h b/tools/perf/util/map.h
> index 9e312ae2d656..c2f5d28fe73a 100644
> --- a/tools/perf/util/map.h
> +++ b/tools/perf/util/map.h
> @@ -147,12 +147,14 @@ int map__set_kallsyms_ref_reloc_sym(struct map *map,
> const char *symbol_name,
> bool __map__is_kernel(const struct map *map);
> bool __map__is_extra_kernel_map(const struct map *map);
> bool __map__is_bpf_prog(const struct map *map);
> +bool __map__is_bpf_image(const struct map *map);
> bool __map__is_ool(const struct map *map);
>
> static inline bool __map__is_kmodule(const struct map *map)
> {
> return !__map__is_kernel(map) && !__map__is_extra_kernel_map(map) &&
> - !__map__is_bpf_prog(map) && !__map__is_ool(map);
> + !__map__is_bpf_prog(map) && !__map__is_ool(map) &&
> + !__map__is_bpf_image(map);
> }
>
> bool map__has_symbols(const struct map *map);
> @@ -164,4 +166,9 @@ static inline bool is_entry_trampoline(const char *name)
> return !strcmp(name, ENTRY_TRAMPOLINE_NAME);
> }
>
> +static inline bool is_bpf_image(const char *name)
> +{
> + return strncmp(name, "bpf_trampoline_", sizeof("bpf_trampoline_") - 1)
> == 0 ||
> + strncmp(name, "bpf_dispatcher_", sizeof("bpf_dispatcher_") - 1)
> == 0;
> +}
> #endif /* __PERF_MAP_H */
> --
> 2.25.4
>
--
- Arnaldo
