| Message ID | 20201106055111.3972047-5-andrii@kernel.org (mailing list archive) |
|---|---|
| State | Superseded |
| Delegated to: | BPF |
| Headers | show |
| Series | Integrate kernel module BTF support | expand |
On Thu, Nov 05, 2020 at 09:51:09PM -0800, Andrii Nakryiko wrote: > Add kernel module listener that will load/validate and unload module BTF. > Module BTFs gets ID generated for them, which makes it possible to iterate > them with existing BTF iteration API. They are given their respective module's > names, which will get reported through GET_OBJ_INFO API. They are also marked > as in-kernel BTFs for tooling to distinguish them from user-provided BTFs. > > Also, similarly to vmlinux BTF, kernel module BTFs are exposed through > sysfs as /sys/kernel/btf/<module-name>. This is convenient for user-space > tools to inspect module BTF contents and dump their types with existing tools: > > [vmuser@archvm bpf]$ ls -la /sys/kernel/btf > total 0 > drwxr-xr-x 2 root root 0 Nov 4 19:46 . > drwxr-xr-x 13 root root 0 Nov 4 19:46 .. > > ... > > -r--r--r-- 1 root root 888 Nov 4 19:46 irqbypass > -r--r--r-- 1 root root 100225 Nov 4 19:46 kvm > -r--r--r-- 1 root root 35401 Nov 4 19:46 kvm_intel > -r--r--r-- 1 root root 120 Nov 4 19:46 pcspkr > -r--r--r-- 1 root root 399 Nov 4 19:46 serio_raw > -r--r--r-- 1 root root 4094095 Nov 4 19:46 vmlinux > > Signed-off-by: Andrii Nakryiko <andrii@kernel.org> > --- > Documentation/ABI/testing/sysfs-kernel-btf | 8 + > include/linux/bpf.h | 2 + > include/linux/module.h | 4 + > kernel/bpf/btf.c | 193 +++++++++++++++++++++ > kernel/bpf/sysfs_btf.c | 2 +- > kernel/module.c | 32 ++++ > 6 files changed, 240 insertions(+), 1 deletion(-) > > diff --git a/Documentation/ABI/testing/sysfs-kernel-btf b/Documentation/ABI/testing/sysfs-kernel-btf > index 2c9744b2cd59..fe96efdc9b6c 100644 > --- a/Documentation/ABI/testing/sysfs-kernel-btf > +++ b/Documentation/ABI/testing/sysfs-kernel-btf > @@ -15,3 +15,11 @@ Description: > information with description of all internal kernel types. See > Documentation/bpf/btf.rst for detailed description of format > itself. > + > +What: /sys/kernel/btf/<module-name> > +Date: Nov 2020 > +KernelVersion: 5.11 > +Contact: bpf@vger.kernel.org > +Description: > + Read-only binary attribute exposing kernel module's BTF type > + information as an add-on to the kernel's BTF (/sys/kernel/btf/vmlinux). > diff --git a/include/linux/bpf.h b/include/linux/bpf.h > index 2fffd30e13ac..3cb89cd7177b 100644 > --- a/include/linux/bpf.h > +++ b/include/linux/bpf.h > @@ -36,9 +36,11 @@ struct seq_operations; > struct bpf_iter_aux_info; > struct bpf_local_storage; > struct bpf_local_storage_map; > +struct kobject; > > extern struct idr btf_idr; > extern spinlock_t btf_idr_lock; > +extern struct kobject *btf_kobj; > > typedef int (*bpf_iter_init_seq_priv_t)(void *private_data, > struct bpf_iter_aux_info *aux); > diff --git a/include/linux/module.h b/include/linux/module.h > index a29187f7c360..20fce258ffba 100644 > --- a/include/linux/module.h > +++ b/include/linux/module.h > @@ -475,6 +475,10 @@ struct module { > unsigned int num_bpf_raw_events; > struct bpf_raw_event_map *bpf_raw_events; > #endif > +#ifdef CONFIG_DEBUG_INFO_BTF_MODULES > + unsigned int btf_data_size; > + void *btf_data; > +#endif > #ifdef CONFIG_JUMP_LABEL > struct jump_entry *jump_entries; > unsigned int num_jump_entries; > diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c > index 09f1483934d2..fe639ffae361 100644 > --- a/kernel/bpf/btf.c > +++ b/kernel/bpf/btf.c > @@ -23,6 +23,8 @@ > #include <linux/perf_event.h> > #include <linux/bsearch.h> > #include <linux/btf_ids.h> > +#include <linux/kobject.h> > +#include <linux/sysfs.h> > #include <net/sock.h> > > /* BTF (BPF Type Format) is the meta data format which describes > @@ -4488,6 +4490,75 @@ struct btf *btf_parse_vmlinux(void) > return ERR_PTR(err); > } > > +static struct btf *btf_parse_module(const char *module_name, const void *data, unsigned int data_size) > +{ > + struct btf_verifier_env *env = NULL; > + struct bpf_verifier_log *log; > + struct btf *btf = NULL, *base_btf; > + int err; > + > + base_btf = bpf_get_btf_vmlinux(); > + if (IS_ERR(base_btf)) > + return base_btf; > + if (!base_btf) > + return ERR_PTR(-EINVAL); > + > + env = kzalloc(sizeof(*env), GFP_KERNEL | __GFP_NOWARN); > + if (!env) > + return ERR_PTR(-ENOMEM); > + > + log = &env->log; > + log->level = BPF_LOG_KERNEL; > + > + btf = kzalloc(sizeof(*btf), GFP_KERNEL | __GFP_NOWARN); > + if (!btf) { > + err = -ENOMEM; > + goto errout; > + } > + env->btf = btf; > + > + btf->base_btf = base_btf; > + btf->start_id = base_btf->nr_types; > + btf->start_str_off = base_btf->hdr.str_len; > + btf->kernel_btf = true; > + snprintf(btf->name, sizeof(btf->name), "%s", module_name); > + > + btf->data = kvmalloc(data_size, GFP_KERNEL | __GFP_NOWARN); > + if (!btf->data) { > + err = -ENOMEM; > + goto errout; > + } > + memcpy(btf->data, data, data_size); > + btf->data_size = data_size; > + > + err = btf_parse_hdr(env); > + if (err) > + goto errout; > + > + btf->nohdr_data = btf->data + btf->hdr.hdr_len; > + > + err = btf_parse_str_sec(env); > + if (err) > + goto errout; > + > + err = btf_check_all_metas(env); > + if (err) > + goto errout; > + > + btf_verifier_env_free(env); > + refcount_set(&btf->refcnt, 1); > + return btf; > + > +errout: > + btf_verifier_env_free(env); > + if (btf) { > + kvfree(btf->data); > + kvfree(btf->types); > + kfree(btf); > + } > + return ERR_PTR(err); > +} > + > struct btf *bpf_prog_get_target_btf(const struct bpf_prog *prog) > { > struct bpf_prog *tgt_prog = prog->aux->dst_prog; > @@ -5661,3 +5732,125 @@ bool btf_id_set_contains(const struct btf_id_set *set, u32 id) > { > return bsearch(&id, set->ids, set->cnt, sizeof(u32), btf_id_cmp_func) != NULL; > } > + > +#ifdef CONFIG_DEBUG_INFO_BTF_MODULES > +struct btf_module { > + struct list_head list; > + struct module *module; > + struct btf *btf; > + struct bin_attribute *sysfs_attr; > +}; > + > +static LIST_HEAD(btf_modules); > +static DEFINE_MUTEX(btf_module_mutex); > + > +static ssize_t > +btf_module_read(struct file *file, struct kobject *kobj, > + struct bin_attribute *bin_attr, > + char *buf, loff_t off, size_t len) > +{ > + const struct btf *btf = bin_attr->private; > + > + memcpy(buf, btf->data + off, len); > + return len; > +} > + > +static int btf_module_notify(struct notifier_block *nb, unsigned long op, > + void *module) > +{ > + struct btf_module *btf_mod, *tmp; > + struct module *mod = module; > + struct btf *btf; > + int err = 0; > + > + if (mod->btf_data_size == 0 || > + (op != MODULE_STATE_COMING && op != MODULE_STATE_GOING)) > + goto out; > + > + switch (op) { > + case MODULE_STATE_COMING: > + btf_mod = kzalloc(sizeof(*btf_mod), GFP_KERNEL); > + if (!btf_mod) { > + err = -ENOMEM; > + goto out; > + } > + btf = btf_parse_module(mod->name, mod->btf_data, mod->btf_data_size); > + if (IS_ERR(btf)) { > + kfree(btf_mod); > + err = PTR_ERR(btf); > + goto out; > + } > + err = btf_alloc_id(btf); > + if (err) { > + btf_free(btf); > + kfree(btf_mod); > + goto out; > + } > + > + mutex_lock(&btf_module_mutex); > + btf_mod->module = module; > + btf_mod->btf = btf; > + list_add(&btf_mod->list, &btf_modules); > + mutex_unlock(&btf_module_mutex); > + > + if (IS_ENABLED(CONFIG_SYSFS)) { > + struct bin_attribute *attr; > + > + attr = kzalloc(sizeof(*attr), GFP_KERNEL); > + if (!attr) { > + WARN(1, "failed to register module [%s] BTF in sysfs\n", mod->name); kzalloc() will print errors on its own, no need to do this again. Also, for systems with panic-on-warn, you just crashed them, not nice :( > + goto out; > + } > + > + attr->attr.name = btf->name; > + attr->attr.mode = 0444; > + attr->size = btf->data_size; > + attr->private = btf; > + attr->read = btf_module_read; > + > + err = sysfs_create_bin_file(btf_kobj, attr); You forgot to call sysfs_bin_attr_init() to initialize your binary sysfs attribute. You'll only notice if you turn lockdep on. > + if (err) { > + kfree(attr); > + WARN(1, "failed to register module [%s] BTF in sysfs: %d\n", > + mod->name, err); Again, just report the error and move on, don't crash systems. Other than these minor things, looks good to me, nice work! thanks, greg k-h
On Thu, Nov 5, 2020 at 10:44 PM Greg Kroah-Hartman <gregkh@linuxfoundation.org> wrote: > > On Thu, Nov 05, 2020 at 09:51:09PM -0800, Andrii Nakryiko wrote: > > Add kernel module listener that will load/validate and unload module BTF. > > Module BTFs gets ID generated for them, which makes it possible to iterate > > them with existing BTF iteration API. They are given their respective module's > > names, which will get reported through GET_OBJ_INFO API. They are also marked > > as in-kernel BTFs for tooling to distinguish them from user-provided BTFs. > > > > Also, similarly to vmlinux BTF, kernel module BTFs are exposed through > > sysfs as /sys/kernel/btf/<module-name>. This is convenient for user-space > > tools to inspect module BTF contents and dump their types with existing tools: > > > > [vmuser@archvm bpf]$ ls -la /sys/kernel/btf > > total 0 > > drwxr-xr-x 2 root root 0 Nov 4 19:46 . > > drwxr-xr-x 13 root root 0 Nov 4 19:46 .. > > > > ... > > > > -r--r--r-- 1 root root 888 Nov 4 19:46 irqbypass > > -r--r--r-- 1 root root 100225 Nov 4 19:46 kvm > > -r--r--r-- 1 root root 35401 Nov 4 19:46 kvm_intel > > -r--r--r-- 1 root root 120 Nov 4 19:46 pcspkr > > -r--r--r-- 1 root root 399 Nov 4 19:46 serio_raw > > -r--r--r-- 1 root root 4094095 Nov 4 19:46 vmlinux > > > > Signed-off-by: Andrii Nakryiko <andrii@kernel.org> > > --- > > Documentation/ABI/testing/sysfs-kernel-btf | 8 + > > include/linux/bpf.h | 2 + > > include/linux/module.h | 4 + > > kernel/bpf/btf.c | 193 +++++++++++++++++++++ > > kernel/bpf/sysfs_btf.c | 2 +- > > kernel/module.c | 32 ++++ > > 6 files changed, 240 insertions(+), 1 deletion(-) > > [...] > > + if (IS_ENABLED(CONFIG_SYSFS)) { > > + struct bin_attribute *attr; > > + > > + attr = kzalloc(sizeof(*attr), GFP_KERNEL); > > + if (!attr) { > > + WARN(1, "failed to register module [%s] BTF in sysfs\n", mod->name); > > kzalloc() will print errors on its own, no need to do this again. Also, > for systems with panic-on-warn, you just crashed them, not nice :( ah, pr_warn() is what I probably wanted here instead of WARN. I'll just drop this, if kzalloc will log a warning anyways. > > > + goto out; > > + } > > + > > + attr->attr.name = btf->name; > > + attr->attr.mode = 0444; > > + attr->size = btf->data_size; > > + attr->private = btf; > > + attr->read = btf_module_read; > > + > > + err = sysfs_create_bin_file(btf_kobj, attr); > > You forgot to call sysfs_bin_attr_init() to initialize your binary sysfs > attribute. You'll only notice if you turn lockdep on. Good catch, fixed. Also added CONFIG_DEBUG_LOCK_ALLOC to my config. > > > > + if (err) { > > + kfree(attr); > > + WARN(1, "failed to register module [%s] BTF in sysfs: %d\n", > > + mod->name, err); > > Again, just report the error and move on, don't crash systems. > Right, fixed. > Other than these minor things, looks good to me, nice work! > Thanks! > thanks, > > greg k-h
diff --git a/Documentation/ABI/testing/sysfs-kernel-btf b/Documentation/ABI/testing/sysfs-kernel-btf index 2c9744b2cd59..fe96efdc9b6c 100644 --- a/Documentation/ABI/testing/sysfs-kernel-btf +++ b/Documentation/ABI/testing/sysfs-kernel-btf @@ -15,3 +15,11 @@ Description: information with description of all internal kernel types. See Documentation/bpf/btf.rst for detailed description of format itself. + +What: /sys/kernel/btf/<module-name> +Date: Nov 2020 +KernelVersion: 5.11 +Contact: bpf@vger.kernel.org +Description: + Read-only binary attribute exposing kernel module's BTF type + information as an add-on to the kernel's BTF (/sys/kernel/btf/vmlinux). diff --git a/include/linux/bpf.h b/include/linux/bpf.h index 2fffd30e13ac..3cb89cd7177b 100644 --- a/include/linux/bpf.h +++ b/include/linux/bpf.h @@ -36,9 +36,11 @@ struct seq_operations; struct bpf_iter_aux_info; struct bpf_local_storage; struct bpf_local_storage_map; +struct kobject; extern struct idr btf_idr; extern spinlock_t btf_idr_lock; +extern struct kobject *btf_kobj; typedef int (*bpf_iter_init_seq_priv_t)(void *private_data, struct bpf_iter_aux_info *aux); diff --git a/include/linux/module.h b/include/linux/module.h index a29187f7c360..20fce258ffba 100644 --- a/include/linux/module.h +++ b/include/linux/module.h @@ -475,6 +475,10 @@ struct module { unsigned int num_bpf_raw_events; struct bpf_raw_event_map *bpf_raw_events; #endif +#ifdef CONFIG_DEBUG_INFO_BTF_MODULES + unsigned int btf_data_size; + void *btf_data; +#endif #ifdef CONFIG_JUMP_LABEL struct jump_entry *jump_entries; unsigned int num_jump_entries; diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c index 09f1483934d2..fe639ffae361 100644 --- a/kernel/bpf/btf.c +++ b/kernel/bpf/btf.c @@ -23,6 +23,8 @@ #include <linux/perf_event.h> #include <linux/bsearch.h> #include <linux/btf_ids.h> +#include <linux/kobject.h> +#include <linux/sysfs.h> #include <net/sock.h> /* BTF (BPF Type Format) is the meta data format which describes @@ -4488,6 +4490,75 @@ struct btf *btf_parse_vmlinux(void) return ERR_PTR(err); } +static struct btf *btf_parse_module(const char *module_name, const void *data, unsigned int data_size) +{ + struct btf_verifier_env *env = NULL; + struct bpf_verifier_log *log; + struct btf *btf = NULL, *base_btf; + int err; + + base_btf = bpf_get_btf_vmlinux(); + if (IS_ERR(base_btf)) + return base_btf; + if (!base_btf) + return ERR_PTR(-EINVAL); + + env = kzalloc(sizeof(*env), GFP_KERNEL | __GFP_NOWARN); + if (!env) + return ERR_PTR(-ENOMEM); + + log = &env->log; + log->level = BPF_LOG_KERNEL; + + btf = kzalloc(sizeof(*btf), GFP_KERNEL | __GFP_NOWARN); + if (!btf) { + err = -ENOMEM; + goto errout; + } + env->btf = btf; + + btf->base_btf = base_btf; + btf->start_id = base_btf->nr_types; + btf->start_str_off = base_btf->hdr.str_len; + btf->kernel_btf = true; + snprintf(btf->name, sizeof(btf->name), "%s", module_name); + + btf->data = kvmalloc(data_size, GFP_KERNEL | __GFP_NOWARN); + if (!btf->data) { + err = -ENOMEM; + goto errout; + } + memcpy(btf->data, data, data_size); + btf->data_size = data_size; + + err = btf_parse_hdr(env); + if (err) + goto errout; + + btf->nohdr_data = btf->data + btf->hdr.hdr_len; + + err = btf_parse_str_sec(env); + if (err) + goto errout; + + err = btf_check_all_metas(env); + if (err) + goto errout; + + btf_verifier_env_free(env); + refcount_set(&btf->refcnt, 1); + return btf; + +errout: + btf_verifier_env_free(env); + if (btf) { + kvfree(btf->data); + kvfree(btf->types); + kfree(btf); + } + return ERR_PTR(err); +} + struct btf *bpf_prog_get_target_btf(const struct bpf_prog *prog) { struct bpf_prog *tgt_prog = prog->aux->dst_prog; @@ -5661,3 +5732,125 @@ bool btf_id_set_contains(const struct btf_id_set *set, u32 id) { return bsearch(&id, set->ids, set->cnt, sizeof(u32), btf_id_cmp_func) != NULL; } + +#ifdef CONFIG_DEBUG_INFO_BTF_MODULES +struct btf_module { + struct list_head list; + struct module *module; + struct btf *btf; + struct bin_attribute *sysfs_attr; +}; + +static LIST_HEAD(btf_modules); +static DEFINE_MUTEX(btf_module_mutex); + +static ssize_t +btf_module_read(struct file *file, struct kobject *kobj, + struct bin_attribute *bin_attr, + char *buf, loff_t off, size_t len) +{ + const struct btf *btf = bin_attr->private; + + memcpy(buf, btf->data + off, len); + return len; +} + +static int btf_module_notify(struct notifier_block *nb, unsigned long op, + void *module) +{ + struct btf_module *btf_mod, *tmp; + struct module *mod = module; + struct btf *btf; + int err = 0; + + if (mod->btf_data_size == 0 || + (op != MODULE_STATE_COMING && op != MODULE_STATE_GOING)) + goto out; + + switch (op) { + case MODULE_STATE_COMING: + btf_mod = kzalloc(sizeof(*btf_mod), GFP_KERNEL); + if (!btf_mod) { + err = -ENOMEM; + goto out; + } + btf = btf_parse_module(mod->name, mod->btf_data, mod->btf_data_size); + if (IS_ERR(btf)) { + kfree(btf_mod); + err = PTR_ERR(btf); + goto out; + } + err = btf_alloc_id(btf); + if (err) { + btf_free(btf); + kfree(btf_mod); + goto out; + } + + mutex_lock(&btf_module_mutex); + btf_mod->module = module; + btf_mod->btf = btf; + list_add(&btf_mod->list, &btf_modules); + mutex_unlock(&btf_module_mutex); + + if (IS_ENABLED(CONFIG_SYSFS)) { + struct bin_attribute *attr; + + attr = kzalloc(sizeof(*attr), GFP_KERNEL); + if (!attr) { + WARN(1, "failed to register module [%s] BTF in sysfs\n", mod->name); + goto out; + } + + attr->attr.name = btf->name; + attr->attr.mode = 0444; + attr->size = btf->data_size; + attr->private = btf; + attr->read = btf_module_read; + + err = sysfs_create_bin_file(btf_kobj, attr); + if (err) { + kfree(attr); + WARN(1, "failed to register module [%s] BTF in sysfs: %d\n", + mod->name, err); + err = 0; + goto out; + } + + btf_mod->sysfs_attr = attr; + } + + break; + case MODULE_STATE_GOING: + mutex_lock(&btf_module_mutex); + list_for_each_entry_safe(btf_mod, tmp, &btf_modules, list) { + if (btf_mod->module != module) + continue; + + list_del(&btf_mod->list); + if (btf_mod->sysfs_attr) + sysfs_remove_bin_file(btf_kobj, btf_mod->sysfs_attr); + btf_put(btf_mod->btf); + kfree(btf_mod->sysfs_attr); + kfree(btf_mod); + break; + } + mutex_unlock(&btf_module_mutex); + break; + } +out: + return notifier_from_errno(err); +} + +static struct notifier_block btf_module_nb = { + .notifier_call = btf_module_notify, +}; + +static int __init btf_module_init(void) +{ + register_module_notifier(&btf_module_nb); + return 0; +} + +fs_initcall(btf_module_init); +#endif /* CONFIG_DEBUG_INFO_BTF_MODULES */ diff --git a/kernel/bpf/sysfs_btf.c b/kernel/bpf/sysfs_btf.c index 11b3380887fa..ef6911aee3bb 100644 --- a/kernel/bpf/sysfs_btf.c +++ b/kernel/bpf/sysfs_btf.c @@ -26,7 +26,7 @@ static struct bin_attribute bin_attr_btf_vmlinux __ro_after_init = { .read = btf_vmlinux_read, }; -static struct kobject *btf_kobj; +struct kobject *btf_kobj; static int __init btf_vmlinux_init(void) { diff --git a/kernel/module.c b/kernel/module.c index a4fa44a652a7..af71fc53eb25 100644 --- a/kernel/module.c +++ b/kernel/module.c @@ -380,6 +380,35 @@ static void *section_objs(const struct load_info *info, return (void *)info->sechdrs[sec].sh_addr; } +/* Find a module section: 0 means not found. Ignores SHF_ALLOC flag. */ +static unsigned int find_any_sec(const struct load_info *info, const char *name) +{ + unsigned int i; + + for (i = 1; i < info->hdr->e_shnum; i++) { + Elf_Shdr *shdr = &info->sechdrs[i]; + if (strcmp(info->secstrings + shdr->sh_name, name) == 0) + return i; + } + return 0; +} + +/* + * Find a module section, or NULL. Fill in number of "objects" in section. + * Ignores SHF_ALLOC flag. + */ +static void *any_section_objs(const struct load_info *info, + const char *name, + size_t object_size, + unsigned int *num) +{ + unsigned int sec = find_any_sec(info, name); + + /* Section 0 has sh_addr 0 and sh_size 0. */ + *num = info->sechdrs[sec].sh_size / object_size; + return (void *)info->sechdrs[sec].sh_addr; +} + /* Provided by the linker */ extern const struct kernel_symbol __start___ksymtab[]; extern const struct kernel_symbol __stop___ksymtab[]; @@ -3250,6 +3279,9 @@ static int find_module_sections(struct module *mod, struct load_info *info) sizeof(*mod->bpf_raw_events), &mod->num_bpf_raw_events); #endif +#ifdef CONFIG_DEBUG_INFO_BTF_MODULES + mod->btf_data = any_section_objs(info, ".BTF", 1, &mod->btf_data_size); +#endif #ifdef CONFIG_JUMP_LABEL mod->jump_entries = section_objs(info, "__jump_table", sizeof(*mod->jump_entries),
Add kernel module listener that will load/validate and unload module BTF. Module BTFs gets ID generated for them, which makes it possible to iterate them with existing BTF iteration API. They are given their respective module's names, which will get reported through GET_OBJ_INFO API. They are also marked as in-kernel BTFs for tooling to distinguish them from user-provided BTFs. Also, similarly to vmlinux BTF, kernel module BTFs are exposed through sysfs as /sys/kernel/btf/<module-name>. This is convenient for user-space tools to inspect module BTF contents and dump their types with existing tools: [vmuser@archvm bpf]$ ls -la /sys/kernel/btf total 0 drwxr-xr-x 2 root root 0 Nov 4 19:46 . drwxr-xr-x 13 root root 0 Nov 4 19:46 .. ... -r--r--r-- 1 root root 888 Nov 4 19:46 irqbypass -r--r--r-- 1 root root 100225 Nov 4 19:46 kvm -r--r--r-- 1 root root 35401 Nov 4 19:46 kvm_intel -r--r--r-- 1 root root 120 Nov 4 19:46 pcspkr -r--r--r-- 1 root root 399 Nov 4 19:46 serio_raw -r--r--r-- 1 root root 4094095 Nov 4 19:46 vmlinux Signed-off-by: Andrii Nakryiko <andrii@kernel.org> --- Documentation/ABI/testing/sysfs-kernel-btf | 8 + include/linux/bpf.h | 2 + include/linux/module.h | 4 + kernel/bpf/btf.c | 193 +++++++++++++++++++++ kernel/bpf/sysfs_btf.c | 2 +- kernel/module.c | 32 ++++ 6 files changed, 240 insertions(+), 1 deletion(-)