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bpf: Export bpf_dynptr_get_size() 

Export bpf_dynptr_get_size(), so that kernel code dealing with eBPF dynamic
pointers can obtain the real size of data carried by this data structure.

Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
Reviewed-by: Joanne Koong <joannelkoong@gmail.com>
Acked-by: KP Singh <kpsingh@kernel.org>
Acked-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/r/20220920075951.929132-6-roberto.sassu@huaweicloud.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Roberto Sassu 2022-09-20 09:59:43 +02:00 committed by Alexei Starovoitov
parent b8d31762a0
commit 51df486571
2 changed files with 2 additions and 1 deletions
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1
include/linux/bpf.h
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@ -2654,6 +2654,7 @@ void bpf_dynptr_init(struct bpf_dynptr_kern *ptr, void *data,
enum bpf_dynptr_type type, u32 offset, u32 size); enum bpf_dynptr_type type, u32 offset, u32 size);
void bpf_dynptr_set_null(struct bpf_dynptr_kern *ptr); void bpf_dynptr_set_null(struct bpf_dynptr_kern *ptr);
int bpf_dynptr_check_size(u32 size); int bpf_dynptr_check_size(u32 size);
u32 bpf_dynptr_get_size(struct bpf_dynptr_kern *ptr);
#ifdef CONFIG_BPF_LSM #ifdef CONFIG_BPF_LSM
void bpf_cgroup_atype_get(u32 attach_btf_id, int cgroup_atype); void bpf_cgroup_atype_get(u32 attach_btf_id, int cgroup_atype);

2
kernel/bpf/helpers.c
View File

@ -1408,7 +1408,7 @@ static void bpf_dynptr_set_type(struct bpf_dynptr_kern *ptr, enum bpf_dynptr_typ
ptr->size |= type << DYNPTR_TYPE_SHIFT; ptr->size |= type << DYNPTR_TYPE_SHIFT;
} }
static u32 bpf_dynptr_get_size(struct bpf_dynptr_kern *ptr) u32 bpf_dynptr_get_size(struct bpf_dynptr_kern *ptr)
{ {
return ptr->size & DYNPTR_SIZE_MASK; return ptr->size & DYNPTR_SIZE_MASK;
} }