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(1.8.8.f.e.b.b.b.5.6.9.e.c.8.5.0.f.f.6.2.a.5.a.7.0.b.8.0.1.0.0.2.ip6.arpa. [2001:8b0:7a5a:26ff:58c:e965:bbbe:f881]) by smtp.gmail.com with ESMTPSA id v20sm7871106wra.73.2021.09.24.02.56.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 24 Sep 2021 02:56:20 -0700 (PDT) From: Lorenz Bauer To: Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , "David S. Miller" , Jakub Kicinski Cc: kernel-team@cloudflare.com, Lorenz Bauer , netdev@vger.kernel.org, bpf@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH bpf-next 4/4] bpf: export bpf_jit_current Date: Fri, 24 Sep 2021 10:55:42 +0100 Message-Id: <20210924095542.33697-5-lmb@cloudflare.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210924095542.33697-1-lmb@cloudflare.com> References: <20210924095542.33697-1-lmb@cloudflare.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org Expose bpf_jit_current as a read only value via sysctl. Signed-off-by: Lorenz Bauer --- include/linux/filter.h | 1 + kernel/bpf/core.c | 3 +-- net/core/sysctl_net_core.c | 7 +++++++ 3 files changed, 9 insertions(+), 2 deletions(-) diff --git a/include/linux/filter.h b/include/linux/filter.h index ef03ff34234d..b2143ad5ce00 100644 --- a/include/linux/filter.h +++ b/include/linux/filter.h @@ -1052,6 +1052,7 @@ extern int bpf_jit_harden; extern int bpf_jit_kallsyms; extern long bpf_jit_limit; extern long bpf_jit_limit_max; +extern atomic_long_t bpf_jit_current; typedef void (*bpf_jit_fill_hole_t)(void *area, unsigned int size); diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c index e844a2a4c99a..93f95e9ee8be 100644 --- a/kernel/bpf/core.c +++ b/kernel/bpf/core.c @@ -525,6 +525,7 @@ int bpf_jit_kallsyms __read_mostly = IS_BUILTIN(CONFIG_BPF_JIT_DEFAULT_ON); int bpf_jit_harden __read_mostly; long bpf_jit_limit __read_mostly; long bpf_jit_limit_max __read_mostly; +atomic_long_t bpf_jit_current __read_mostly; static void bpf_prog_ksym_set_addr(struct bpf_prog *prog) @@ -800,8 +801,6 @@ int bpf_jit_add_poke_descriptor(struct bpf_prog *prog, return slot; } -static atomic_long_t bpf_jit_current; - /* Can be overridden by an arch's JIT compiler if it has a custom, * dedicated BPF backend memory area, or if neither of the two * below apply. diff --git a/net/core/sysctl_net_core.c b/net/core/sysctl_net_core.c index 5f88526ad61c..674aac163b84 100644 --- a/net/core/sysctl_net_core.c +++ b/net/core/sysctl_net_core.c @@ -421,6 +421,13 @@ static struct ctl_table net_core_table[] = { .extra1 = &long_one, .extra2 = &bpf_jit_limit_max, }, + { + .procname = "bpf_jit_current", + .data = &bpf_jit_current, + .maxlen = sizeof(long), + .mode = 0400, + .proc_handler = proc_dolongvec_minmax_bpf_restricted, + }, #endif { .procname = "netdev_tstamp_prequeue", -- 2.30.2