diff mbox series

[bpf-next,2/3] bpf: Pass const struct bpf_prog * to .check_member

Message ID 20230123232228.646563-3-void@manifault.com (mailing list archive)
State Superseded
Delegated to: BPF
Headers show
Series Enable struct_ops programs to be sleepable | expand

Checks

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bpf/vmtest-bpf-next-VM_Test-17 success Logs for test_progs on x86_64 with gcc
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bpf/vmtest-bpf-next-VM_Test-36 fail Logs for test_verifier on s390x with gcc
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netdev/tree_selection success Clearly marked for bpf-next, async
netdev/fixes_present success Fixes tag not required for -next series
netdev/subject_prefix success Link
netdev/cover_letter success Series has a cover letter
netdev/patch_count success Link
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 1395 this patch: 1395
netdev/cc_maintainers warning 8 maintainers not CCed: yoshfuji@linux-ipv6.org edumazet@google.com netdev@vger.kernel.org davem@davemloft.net yhs@fb.com kuba@kernel.org dsahern@kernel.org pabeni@redhat.com
netdev/build_clang success Errors and warnings before: 149 this patch: 149
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Commit Message

David Vernet Jan. 23, 2023, 11:22 p.m. UTC 
The .check_member field of struct bpf_struct_ops is currently passed the
member's btf_type via const struct btf_type *t, and a const struct
btf_member *member. This allows the struct_ops implementation to check
whether e.g. an ops is supported, but it would be useful to also allow
it to enforce that the struct_ops prog being loaded for that member has
other properties, like being sleepable (or not). This patch therefore
updates the .check_member() callback to also take a const struct
bpf_prog *prog argument.

Signed-off-by: David Vernet <void@manifault.com>
---
 include/linux/bpf.h   | 3 ++-
 kernel/bpf/verifier.c | 2 +-
 net/ipv4/bpf_tcp_ca.c | 3 ++-
 3 files changed, 5 insertions(+), 3 deletions(-)
diff mbox series

Patch

diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index ae7771c7d750..b30739634947 100644
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -1421,7 +1421,8 @@  struct bpf_struct_ops {
 	const struct bpf_verifier_ops *verifier_ops;
 	int (*init)(struct btf *btf);
 	int (*check_member)(const struct btf_type *t,
-			    const struct btf_member *member);
+			    const struct btf_member *member,
+			    const struct bpf_prog *prog);
 	int (*init_member)(const struct btf_type *t,
 			   const struct btf_member *member,
 			   void *kdata, const void *udata);
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 6b8dcd542950..eaa0b9acb555 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -16714,7 +16714,7 @@  static int check_struct_ops_btf_id(struct bpf_verifier_env *env)
 	}
 
 	if (st_ops->check_member) {
-		int err = st_ops->check_member(t, member);
+		int err = st_ops->check_member(t, member, prog);
 
 		if (err) {
 			verbose(env, "attach to unsupported member %s of struct %s\n",
diff --git a/net/ipv4/bpf_tcp_ca.c b/net/ipv4/bpf_tcp_ca.c
index 4517d2bd186a..13fc0c185cd9 100644
--- a/net/ipv4/bpf_tcp_ca.c
+++ b/net/ipv4/bpf_tcp_ca.c
@@ -248,7 +248,8 @@  static int bpf_tcp_ca_init_member(const struct btf_type *t,
 }
 
 static int bpf_tcp_ca_check_member(const struct btf_type *t,
-				   const struct btf_member *member)
+				   const struct btf_member *member,
+				   const struct bpf_prog *prog)
 {
 	if (is_unsupported(__btf_member_bit_offset(t, member) / 8))
 		return -ENOTSUPP;