All of lore.kernel.org
 help / color / mirror / Atom feed
From: "Toke Høiland-Jørgensen" <toke@redhat.com>
To: Alexei Starovoitov <ast@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>,
	Martin KaFai Lau <kafai@fb.com>, Song Liu <songliubraving@fb.com>,
	Yonghong Song <yhs@fb.com>, Andrii Nakryiko <andriin@fb.com>,
	John Fastabend <john.fastabend@gmail.com>,
	KP Singh <kpsingh@chromium.org>,
	netdev@vger.kernel.org, bpf@vger.kernel.org
Subject: [PATCH bpf-next v2 1/6] bpf: change logging calls from verbose() to bpf_log() and use log pointer
Date: Wed, 15 Jul 2020 15:09:00 +0200	[thread overview]
Message-ID: <159481854034.454654.14793846101394162640.stgit@toke.dk> (raw)
In-Reply-To: <159481853923.454654.12184603524310603480.stgit@toke.dk>

From: Toke Høiland-Jørgensen <toke@redhat.com>

In preparation for moving code around, change a bunch of references to
env->log (and the verbose() logging helper) to use bpf_log() and a direct
pointer to struct bpf_verifier_log. While we're touching the function
signature, mark the 'prog' argument to bpf_check_type_match() as const.

Also enhance the bpf_verifier_log_needed() check to handle NULL pointers
for the log struct so we can re-use the code with logging disabled.

Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
---
 include/linux/bpf.h          |    2 +-
 include/linux/bpf_verifier.h |    2 +-
 kernel/bpf/btf.c             |    6 +++--
 kernel/bpf/verifier.c        |   46 +++++++++++++++++++++---------------------
 4 files changed, 28 insertions(+), 28 deletions(-)

diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index c67c88ad35f8..154aab467728 100644
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -1314,7 +1314,7 @@ int btf_check_func_arg_match(struct bpf_verifier_env *env, int subprog,
 			     struct bpf_reg_state *regs);
 int btf_prepare_func_args(struct bpf_verifier_env *env, int subprog,
 			  struct bpf_reg_state *reg);
-int btf_check_type_match(struct bpf_verifier_env *env, struct bpf_prog *prog,
+int btf_check_type_match(struct bpf_verifier_log *log, const struct bpf_prog *prog,
 			 struct btf *btf, const struct btf_type *t);
 
 struct bpf_prog *bpf_prog_by_id(u32 id);
diff --git a/include/linux/bpf_verifier.h b/include/linux/bpf_verifier.h
index 53c7bd568c5d..f1ee7468ec28 100644
--- a/include/linux/bpf_verifier.h
+++ b/include/linux/bpf_verifier.h
@@ -347,7 +347,7 @@ static inline bool bpf_verifier_log_full(const struct bpf_verifier_log *log)
 
 static inline bool bpf_verifier_log_needed(const struct bpf_verifier_log *log)
 {
-	return (log->level && log->ubuf && !bpf_verifier_log_full(log)) ||
+	return (log && log->level && log->ubuf && !bpf_verifier_log_full(log)) ||
 		log->level == BPF_LOG_KERNEL;
 }
 
diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c
index 03d6d43bb1d6..e9122e260950 100644
--- a/kernel/bpf/btf.c
+++ b/kernel/bpf/btf.c
@@ -4285,7 +4285,7 @@ static int btf_check_func_type_match(struct bpf_verifier_log *log,
 }
 
 /* Compare BTFs of given program with BTF of target program */
-int btf_check_type_match(struct bpf_verifier_env *env, struct bpf_prog *prog,
+int btf_check_type_match(struct bpf_verifier_log *log, const struct bpf_prog *prog,
 			 struct btf *btf2, const struct btf_type *t2)
 {
 	struct btf *btf1 = prog->aux->btf;
@@ -4293,7 +4293,7 @@ int btf_check_type_match(struct bpf_verifier_env *env, struct bpf_prog *prog,
 	u32 btf_id = 0;
 
 	if (!prog->aux->func_info) {
-		bpf_log(&env->log, "Program extension requires BTF\n");
+		bpf_log(log, "Program extension requires BTF\n");
 		return -EINVAL;
 	}
 
@@ -4305,7 +4305,7 @@ int btf_check_type_match(struct bpf_verifier_env *env, struct bpf_prog *prog,
 	if (!t1 || !btf_type_is_func(t1))
 		return -EFAULT;
 
-	return btf_check_func_type_match(&env->log, btf1, t1, btf2, t2);
+	return btf_check_func_type_match(log, btf1, t1, btf2, t2);
 }
 
 /* Compare BTF of a function with given bpf_reg_state.
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 3c1efc9d08fd..6f35b4924b4c 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -10736,6 +10736,7 @@ static int check_attach_btf_id(struct bpf_verifier_env *env)
 	struct bpf_prog *prog = env->prog;
 	bool prog_extension = prog->type == BPF_PROG_TYPE_EXT;
 	struct bpf_prog *tgt_prog = prog->aux->linked_prog;
+	struct bpf_verifier_log *log = &env->log;
 	u32 btf_id = prog->aux->attach_btf_id;
 	const char prefix[] = "btf_trace_";
 	struct btf_func_model fmodel;
@@ -10757,23 +10758,23 @@ static int check_attach_btf_id(struct bpf_verifier_env *env)
 		return 0;
 
 	if (!btf_id) {
-		verbose(env, "Tracing programs must provide btf_id\n");
+		bpf_log(log, "Tracing programs must provide btf_id\n");
 		return -EINVAL;
 	}
 	btf = bpf_prog_get_target_btf(prog);
 	if (!btf) {
-		verbose(env,
+		bpf_log(log,
 			"FENTRY/FEXIT program can only be attached to another program annotated with BTF\n");
 		return -EINVAL;
 	}
 	t = btf_type_by_id(btf, btf_id);
 	if (!t) {
-		verbose(env, "attach_btf_id %u is invalid\n", btf_id);
+		bpf_log(log, "attach_btf_id %u is invalid\n", btf_id);
 		return -EINVAL;
 	}
 	tname = btf_name_by_offset(btf, t->name_off);
 	if (!tname) {
-		verbose(env, "attach_btf_id %u doesn't have a name\n", btf_id);
+		bpf_log(log, "attach_btf_id %u doesn't have a name\n", btf_id);
 		return -EINVAL;
 	}
 	if (tgt_prog) {
@@ -10785,18 +10786,18 @@ static int check_attach_btf_id(struct bpf_verifier_env *env)
 				break;
 			}
 		if (subprog == -1) {
-			verbose(env, "Subprog %s doesn't exist\n", tname);
+			bpf_log(log, "Subprog %s doesn't exist\n", tname);
 			return -EINVAL;
 		}
 		conservative = aux->func_info_aux[subprog].unreliable;
 		if (prog_extension) {
 			if (conservative) {
-				verbose(env,
+				bpf_log(log,
 					"Cannot replace static functions\n");
 				return -EINVAL;
 			}
 			if (!prog->jit_requested) {
-				verbose(env,
+				bpf_log(log,
 					"Extension programs should be JITed\n");
 				return -EINVAL;
 			}
@@ -10804,7 +10805,7 @@ static int check_attach_btf_id(struct bpf_verifier_env *env)
 			prog->expected_attach_type = tgt_prog->expected_attach_type;
 		}
 		if (!tgt_prog->jited) {
-			verbose(env, "Can attach to only JITed progs\n");
+			bpf_log(log, "Can attach to only JITed progs\n");
 			return -EINVAL;
 		}
 		if (tgt_prog->type == prog->type) {
@@ -10812,7 +10813,7 @@ static int check_attach_btf_id(struct bpf_verifier_env *env)
 			 * Cannot attach program extension to another extension.
 			 * It's ok to attach fentry/fexit to extension program.
 			 */
-			verbose(env, "Cannot recursively attach\n");
+			bpf_log(log, "Cannot recursively attach\n");
 			return -EINVAL;
 		}
 		if (tgt_prog->type == BPF_PROG_TYPE_TRACING &&
@@ -10834,13 +10835,13 @@ static int check_attach_btf_id(struct bpf_verifier_env *env)
 			 * reasonable stack size. Hence extending fentry is not
 			 * allowed.
 			 */
-			verbose(env, "Cannot extend fentry/fexit\n");
+			bpf_log(log, "Cannot extend fentry/fexit\n");
 			return -EINVAL;
 		}
 		key = ((u64)aux->id) << 32 | btf_id;
 	} else {
 		if (prog_extension) {
-			verbose(env, "Cannot replace kernel functions\n");
+			bpf_log(log, "Cannot replace kernel functions\n");
 			return -EINVAL;
 		}
 		key = btf_id;
@@ -10849,17 +10850,17 @@ static int check_attach_btf_id(struct bpf_verifier_env *env)
 	switch (prog->expected_attach_type) {
 	case BPF_TRACE_RAW_TP:
 		if (tgt_prog) {
-			verbose(env,
+			bpf_log(log,
 				"Only FENTRY/FEXIT progs are attachable to another BPF prog\n");
 			return -EINVAL;
 		}
 		if (!btf_type_is_typedef(t)) {
-			verbose(env, "attach_btf_id %u is not a typedef\n",
+			bpf_log(log, "attach_btf_id %u is not a typedef\n",
 				btf_id);
 			return -EINVAL;
 		}
 		if (strncmp(prefix, tname, sizeof(prefix) - 1)) {
-			verbose(env, "attach_btf_id %u points to wrong type name %s\n",
+			bpf_log(log, "attach_btf_id %u points to wrong type name %s\n",
 				btf_id, tname);
 			return -EINVAL;
 		}
@@ -10882,7 +10883,7 @@ static int check_attach_btf_id(struct bpf_verifier_env *env)
 		return 0;
 	case BPF_TRACE_ITER:
 		if (!btf_type_is_func(t)) {
-			verbose(env, "attach_btf_id %u is not a function\n",
+			bpf_log(log, "attach_btf_id %u is not a function\n",
 				btf_id);
 			return -EINVAL;
 		}
@@ -10893,8 +10894,7 @@ static int check_attach_btf_id(struct bpf_verifier_env *env)
 		prog->aux->attach_func_proto = t;
 		if (!bpf_iter_prog_supported(prog))
 			return -EINVAL;
-		ret = btf_distill_func_proto(&env->log, btf, t,
-					     tname, &fmodel);
+		ret = btf_distill_func_proto(log, btf, t, tname, &fmodel);
 		return ret;
 	default:
 		if (!prog_extension)
@@ -10906,18 +10906,18 @@ static int check_attach_btf_id(struct bpf_verifier_env *env)
 	case BPF_TRACE_FEXIT:
 		prog->aux->attach_func_name = tname;
 		if (prog->type == BPF_PROG_TYPE_LSM) {
-			ret = bpf_lsm_verify_prog(&env->log, prog);
+			ret = bpf_lsm_verify_prog(log, prog);
 			if (ret < 0)
 				return ret;
 		}
 
 		if (!btf_type_is_func(t)) {
-			verbose(env, "attach_btf_id %u is not a function\n",
+			bpf_log(log, "attach_btf_id %u is not a function\n",
 				btf_id);
 			return -EINVAL;
 		}
 		if (prog_extension &&
-		    btf_check_type_match(env, prog, btf, t))
+		    btf_check_type_match(log, prog, btf, t))
 			return -EINVAL;
 		t = btf_type_by_id(btf, t->type);
 		if (!btf_type_is_func_proto(t))
@@ -10936,7 +10936,7 @@ static int check_attach_btf_id(struct bpf_verifier_env *env)
 			prog->aux->attach_func_proto = NULL;
 			t = NULL;
 		}
-		ret = btf_distill_func_proto(&env->log, btf, t,
+		ret = btf_distill_func_proto(log, btf, t,
 					     tname, &tr->func.model);
 		if (ret < 0)
 			goto out;
@@ -10948,7 +10948,7 @@ static int check_attach_btf_id(struct bpf_verifier_env *env)
 		} else {
 			addr = kallsyms_lookup_name(tname);
 			if (!addr) {
-				verbose(env,
+				bpf_log(log,
 					"The address of function %s cannot be found\n",
 					tname);
 				ret = -ENOENT;
@@ -10959,7 +10959,7 @@ static int check_attach_btf_id(struct bpf_verifier_env *env)
 		if (prog->expected_attach_type == BPF_MODIFY_RETURN) {
 			ret = check_attach_modify_return(prog, addr);
 			if (ret)
-				verbose(env, "%s() is not modifiable\n",
+				bpf_log(log, "%s() is not modifiable\n",
 					prog->aux->attach_func_name);
 		}
 


  reply	other threads:[~2020-07-15 13:09 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-15 13:08 [PATCH bpf-next v2 0/6] bpf: Support multi-attach for freplace programs Toke Høiland-Jørgensen
2020-07-15 13:09 ` Toke Høiland-Jørgensen [this message]
2020-07-16 10:10   ` [PATCH bpf-next v2 1/6] bpf: change logging calls from verbose() to bpf_log() and use log pointer Dan Carpenter
2020-07-16 10:10     ` Dan Carpenter
2020-07-16 10:10     ` Dan Carpenter
2020-07-15 13:09 ` [PATCH bpf-next v2 2/6] bpf: verifier: refactor check_attach_btf_id() Toke Høiland-Jørgensen
2020-07-15 13:09 ` [PATCH bpf-next v2 3/6] bpf: support attaching freplace programs to multiple attach points Toke Høiland-Jørgensen
2020-07-15 20:44   ` Alexei Starovoitov
2020-07-16 10:50     ` Toke Høiland-Jørgensen
2020-07-17  2:05       ` Alexei Starovoitov
2020-07-17 10:52         ` Toke Høiland-Jørgensen
2020-07-20 22:57           ` Alexei Starovoitov
2020-07-20  5:02         ` Andrii Nakryiko
2020-07-20 23:34           ` Alexei Starovoitov
2020-07-21  3:48             ` Andrii Nakryiko
2020-07-22  0:29               ` Alexei Starovoitov
2020-07-22  6:02                 ` Andrii Nakryiko
2020-07-23  0:32                   ` Alexei Starovoitov
2020-07-23  0:56                     ` Andrii Nakryiko
2020-07-16 10:14   ` Dan Carpenter
2020-07-16 10:14     ` Dan Carpenter
2020-07-16 10:14     ` Dan Carpenter
2020-07-15 13:09 ` [PATCH bpf-next v2 4/6] tools: add new members to bpf_attr.raw_tracepoint in bpf.h Toke Høiland-Jørgensen
2020-07-15 13:09 ` [PATCH bpf-next v2 5/6] libbpf: add support for supplying target to bpf_raw_tracepoint_open() Toke Høiland-Jørgensen
2020-07-15 13:09 ` [PATCH bpf-next v2 6/6] selftests: add test for multiple attachments of freplace program Toke Høiland-Jørgensen
2020-07-15 19:11 [PATCH bpf-next v2 1/6] bpf: change logging calls from verbose() to bpf_log() and use log pointer kernel test robot

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=159481854034.454654.14793846101394162640.stgit@toke.dk \
    --to=toke@redhat.com \
    --cc=andriin@fb.com \
    --cc=ast@kernel.org \
    --cc=bpf@vger.kernel.org \
    --cc=daniel@iogearbox.net \
    --cc=john.fastabend@gmail.com \
    --cc=kafai@fb.com \
    --cc=kpsingh@chromium.org \
    --cc=netdev@vger.kernel.org \
    --cc=songliubraving@fb.com \
    --cc=yhs@fb.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.