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UPSTREAM: bpf: Allow local storage to be used from LSM programs

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Adds support for both bpf_{sk, inode}_storage_{get, delete} to be used
in LSM programs. These helpers are not used for tracing programs
(currently) as their usage is tied to the life-cycle of the object and
should only be used where the owning object won't be freed (when the
owning object is passed as an argument to the LSM hook). Thus, they
are safer to use in LSM hooks than tracing. Usage of local storage in
tracing programs will probably follow a per function based whitelist
approach.

Since the UAPI helper signature for bpf_sk_storage expect a bpf_sock,
it, leads to a compilation warning for LSM programs, it's also updated
to accept a void * pointer instead.

Change-Id: I3b20b62f47095265fd8e00aa97032886edf3e407
Signed-off-by: KP Singh <[email protected]>
Signed-off-by: Alexei Starovoitov <[email protected]>
Acked-by: Martin KaFai Lau <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]
This commit is contained in:
KP Singh 2020-08-25 20:29:18 +02:00 • committed by basamaryan
commit e17091619f
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5 changed files with 57 additions and 5 deletions
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7
tools/include/uapi/linux/bpf.h
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@ -2782,7 +2782,7 @@ union bpf_attr {
*
* **-ERANGE** if resulting value was out of range.
*
* void *bpf_sk_storage_get(struct bpf_map *map, struct bpf_sock *sk, void *value, u64 flags)
* void *bpf_sk_storage_get(struct bpf_map *map, void *sk, void *value, u64 flags)
* Description
* Get a bpf-local-storage from a *sk*.
*
@ -2798,6 +2798,9 @@ union bpf_attr {
* "type". The bpf-local-storage "type" (i.e. the *map*) is
* searched against all bpf-local-storages residing at *sk*.
*
* *sk* is a kernel **struct sock** pointer for LSM program.
* *sk* is a **struct bpf_sock** pointer for other program types.
*
* An optional *flags* (**BPF_SK_STORAGE_GET_F_CREATE**) can be
* used such that a new bpf-local-storage will be
* created if one does not exist. *value* can be used
@ -2810,7 +2813,7 @@ union bpf_attr {
* **NULL** if not found or there was an error in adding
* a new bpf-local-storage.
*
* long bpf_sk_storage_delete(struct bpf_map *map, struct bpf_sock *sk)
* long bpf_sk_storage_delete(struct bpf_map *map, void *sk)
* Description
* Delete a bpf-local-storage from a *sk*.
* Return