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Tue, 12 May 2020 05:57:08 +0000 Received: from pps.filterd (aserp3020.oracle.com [127.0.0.1]) by aserp3020.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 04C5sVEW191538; Tue, 12 May 2020 05:57:07 GMT Received: from userv0122.oracle.com (userv0122.oracle.com [156.151.31.75]) by aserp3020.oracle.com with ESMTP id 30xbgh7tdc-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 12 May 2020 05:57:07 +0000 Received: from abhmp0017.oracle.com (abhmp0017.oracle.com [141.146.116.23]) by userv0122.oracle.com (8.14.4/8.14.4) with ESMTP id 04C5v58W028346; Tue, 12 May 2020 05:57:05 GMT Received: from localhost.uk.oracle.com (/10.175.210.30) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Mon, 11 May 2020 22:57:05 -0700 From: Alan Maguire To: ast@kernel.org, daniel@iogearbox.net, bpf@vger.kernel.org Cc: joe@perches.com, linux@rasmusvillemoes.dk, arnaldo.melo@gmail.com, yhs@fb.com, kafai@fb.com, songliubraving@fb.com, andriin@fb.com, john.fastabend@gmail.com, kpsingh@chromium.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, Alan Maguire Subject: [PATCH v2 bpf-next 1/7] bpf: provide function to get vmlinux BTF information Date: Tue, 12 May 2020 06:56:39 +0100 Message-Id: <1589263005-7887-2-git-send-email-alan.maguire@oracle.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1589263005-7887-1-git-send-email-alan.maguire@oracle.com> References: <1589263005-7887-1-git-send-email-alan.maguire@oracle.com> X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9618 signatures=668687 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 adultscore=0 mlxlogscore=999 spamscore=0 suspectscore=0 phishscore=0 bulkscore=0 mlxscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2005120052 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9618 signatures=668687 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 impostorscore=0 mlxscore=0 suspectscore=0 bulkscore=0 mlxlogscore=999 phishscore=0 malwarescore=0 lowpriorityscore=0 spamscore=0 adultscore=0 clxscore=1011 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2005120052 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org It will be used later for BTF printk() support Signed-off-by: Alan Maguire --- include/linux/bpf.h | 2 ++ kernel/bpf/verifier.c | 18 ++++++++++++------ 2 files changed, 14 insertions(+), 6 deletions(-) diff --git a/include/linux/bpf.h b/include/linux/bpf.h index cf4b6e4..de19a35 100644 --- a/include/linux/bpf.h +++ b/include/linux/bpf.h @@ -1203,6 +1203,8 @@ int bpf_check(struct bpf_prog **fp, union bpf_attr *attr, union bpf_attr __user *uattr); void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth); +struct btf *bpf_get_btf_vmlinux(void); + /* Map specifics */ struct xdp_buff; struct sk_buff; diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index 2a1826c..c6b1ba0 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -10728,6 +10728,17 @@ static int check_attach_btf_id(struct bpf_verifier_env *env) } } +struct btf *bpf_get_btf_vmlinux(void) +{ + if (!btf_vmlinux && IS_ENABLED(CONFIG_DEBUG_INFO_BTF)) { + mutex_lock(&bpf_verifier_lock); + if (!btf_vmlinux) + btf_vmlinux = btf_parse_vmlinux(); + mutex_unlock(&bpf_verifier_lock); + } + return btf_vmlinux; +} + int bpf_check(struct bpf_prog **prog, union bpf_attr *attr, union bpf_attr __user *uattr) { @@ -10761,12 +10772,7 @@ int bpf_check(struct bpf_prog **prog, union bpf_attr *attr, env->ops = bpf_verifier_ops[env->prog->type]; is_priv = capable(CAP_SYS_ADMIN); - if (!btf_vmlinux && IS_ENABLED(CONFIG_DEBUG_INFO_BTF)) { - mutex_lock(&bpf_verifier_lock); - if (!btf_vmlinux) - btf_vmlinux = btf_parse_vmlinux(); - mutex_unlock(&bpf_verifier_lock); - } + bpf_get_btf_vmlinux(); /* grab the mutex to protect few globals used by verifier */ if (!is_priv) -- 1.8.3.1