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Date: Thu, 23 Jan 2020 07:24:31 -0800 From: KP Singh <kpsingh@...omium.org> To: linux-kernel@...r.kernel.org, bpf@...r.kernel.org, linux-security-module@...r.kernel.org Cc: Brendan Jackman <jackmanb@...gle.com>, Florent Revest <revest@...gle.com>, Thomas Garnier <thgarnie@...gle.com>, Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, James Morris <jmorris@...ei.org>, Kees Cook <keescook@...omium.org>, Thomas Garnier <thgarnie@...omium.org>, Michael Halcrow <mhalcrow@...gle.com>, Paul Turner <pjt@...gle.com>, Brendan Gregg <brendan.d.gregg@...il.com>, Jann Horn <jannh@...gle.com>, Matthew Garrett <mjg59@...gle.com>, Christian Brauner <christian@...uner.io>, Mickaël Salaün <mic@...ikod.net>, Florent Revest <revest@...omium.org>, Brendan Jackman <jackmanb@...omium.org>, Martin KaFai Lau <kafai@...com>, Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>, "Serge E. Hallyn" <serge@...lyn.com>, Mauro Carvalho Chehab <mchehab+samsung@...nel.org>, "David S. Miller" <davem@...emloft.net>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Nicolas Ferre <nicolas.ferre@...rochip.com>, Stanislav Fomichev <sdf@...gle.com>, Quentin Monnet <quentin.monnet@...ronome.com>, Andrey Ignatov <rdna@...com>, Joe Stringer <joe@...d.net.nz> Subject: [PATCH bpf-next v3 01/10] bpf: btf: Add btf_type_by_name_kind From: KP Singh <kpsingh@...gle.com> - The LSM code does the combination of btf_find_by_name_kind and btf_type_by_id a couple of times to figure out the BTF type for security_hook_heads and security_list_options. - Add an extern for btf_vmlinux in btf.h Signed-off-by: KP Singh <kpsingh@...gle.com> Reviewed-by: Brendan Jackman <jackmanb@...gle.com> Reviewed-by: Florent Revest <revest@...gle.com> Reviewed-by: Thomas Garnier <thgarnie@...gle.com> --- include/linux/btf.h | 3 +++ kernel/bpf/btf.c | 12 ++++++++++++ 2 files changed, 15 insertions(+) diff --git a/include/linux/btf.h b/include/linux/btf.h index 5c1ea99b480f..d4e859f90a39 100644 --- a/include/linux/btf.h +++ b/include/linux/btf.h @@ -15,6 +15,7 @@ struct btf_type; union bpf_attr; extern const struct file_operations btf_fops; +extern struct btf *btf_vmlinux; void btf_put(struct btf *btf); int btf_new_fd(const union bpf_attr *attr); @@ -66,6 +67,8 @@ const struct btf_type * btf_resolve_size(const struct btf *btf, const struct btf_type *type, u32 *type_size, const struct btf_type **elem_type, u32 *total_nelems); +const struct btf_type *btf_type_by_name_kind( + struct btf *btf, const char *name, u8 kind); #define for_each_member(i, struct_type, member) \ for (i = 0, member = btf_type_member(struct_type); \ diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c index 32963b6d5a9c..ea53c16802cb 100644 --- a/kernel/bpf/btf.c +++ b/kernel/bpf/btf.c @@ -441,6 +441,18 @@ const struct btf_type *btf_type_resolve_func_ptr(const struct btf *btf, return NULL; } +const struct btf_type *btf_type_by_name_kind( + struct btf *btf, const char *name, u8 kind) +{ + s32 type_id; + + type_id = btf_find_by_name_kind(btf, name, kind); + if (type_id < 0) + return ERR_PTR(type_id); + + return btf_type_by_id(btf, type_id); +} + /* Types that act only as a source, not sink or intermediate * type when resolving. */ -- 2.20.1
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