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Fri, 26 Sep 2025 23:12:19 -0700 (PDT) From: Menglong Dong X-Google-Original-From: Menglong Dong To: ast@kernel.org Cc: bpf@vger.kernel.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, jiang.biao@linux.dev Subject: [PATCH RFC bpf-next 1/3] bpf: report probe fault to BPF stderr Date: Sat, 27 Sep 2025 14:12:08 +0800 Message-ID: <20250927061210.194502-2-menglong.dong@linux.dev> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20250927061210.194502-1-menglong.dong@linux.dev> References: <20250927061210.194502-1-menglong.dong@linux.dev> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Introduce the function bpf_prog_report_probe_violation(), which is used to report the memory probe fault to the user by the BPF stderr. Signed-off-by: Menglong Dong --- include/linux/bpf.h | 1 + kernel/trace/bpf_trace.c | 18 ++++++++++++++++++ 2 files changed, 19 insertions(+) diff --git a/include/linux/bpf.h b/include/linux/bpf.h index 6338e54a9b1f..a31c5ce56c32 100644 --- a/include/linux/bpf.h +++ b/include/linux/bpf.h @@ -2902,6 +2902,7 @@ void bpf_dynptr_init(struct bpf_dynptr_kern *ptr, voi= d *data, void bpf_dynptr_set_null(struct bpf_dynptr_kern *ptr); void bpf_dynptr_set_rdonly(struct bpf_dynptr_kern *ptr); void bpf_prog_report_arena_violation(bool write, unsigned long addr, unsig= ned long fault_ip); +void bpf_prog_report_probe_violation(bool write, unsigned long fault_ip); =20 #else /* !CONFIG_BPF_SYSCALL */ static inline struct bpf_prog *bpf_prog_get(u32 ufd) diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c index 8f23f5273bab..9bd03a9f53db 100644 --- a/kernel/trace/bpf_trace.c +++ b/kernel/trace/bpf_trace.c @@ -2055,6 +2055,24 @@ void bpf_put_raw_tracepoint(struct bpf_raw_event_map= *btp) module_put(mod); } =20 +void bpf_prog_report_probe_violation(bool write, unsigned long fault_ip) +{ + struct bpf_stream_stage ss; + struct bpf_prog *prog; + + rcu_read_lock(); + prog =3D bpf_prog_ksym_find(fault_ip); + rcu_read_unlock(); + if (!prog) + return; + + bpf_stream_stage(ss, prog, BPF_STDERR, ({ + bpf_stream_printk(ss, "ERROR: Probe %s access faule, insn=3D0x%lx\n", + write ? 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Fri, 26 Sep 2025 23:12:21 -0700 (PDT) From: Menglong Dong X-Google-Original-From: Menglong Dong To: ast@kernel.org Cc: bpf@vger.kernel.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, jiang.biao@linux.dev Subject: [PATCH RFC bpf-next 2/3] x86,bpf: use bpf_prog_report_probe_violation for x86 Date: Sat, 27 Sep 2025 14:12:09 +0800 Message-ID: <20250927061210.194502-3-menglong.dong@linux.dev> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20250927061210.194502-1-menglong.dong@linux.dev> References: <20250927061210.194502-1-menglong.dong@linux.dev> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Use bpf_prog_report_probe_violation() to report the memory probe fault in ex_handler_bpf(). Signed-off-by: Menglong Dong --- arch/x86/net/bpf_jit_comp.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/x86/net/bpf_jit_comp.c b/arch/x86/net/bpf_jit_comp.c index fc13306af15f..03d4d8385f4c 100644 --- a/arch/x86/net/bpf_jit_comp.c +++ b/arch/x86/net/bpf_jit_comp.c @@ -1470,6 +1470,8 @@ bool ex_handler_bpf(const struct exception_table_entr= y *x, struct pt_regs *regs) off =3D FIELD_GET(DATA_ARENA_OFFSET_MASK, x->data); addr =3D *(unsigned long *)((void *)regs + arena_reg) + off; bpf_prog_report_arena_violation(is_write, addr, regs->ip); + } else { + bpf_prog_report_probe_violation(is_write, regs->ip); } =20 /* jump over faulting load and clear dest register */ --=20 2.51.0 From nobody Wed Oct 1 22:34:50 2025 Received: from mail-pf1-f194.google.com (mail-pf1-f194.google.com [209.85.210.194]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B06AE266B65 for ; Sat, 27 Sep 2025 06:12:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; 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Fri, 26 Sep 2025 23:12:24 -0700 (PDT) Received: from 7950hx ([43.129.244.20]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-781023edda8sm5891178b3a.43.2025.09.26.23.12.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 26 Sep 2025 23:12:23 -0700 (PDT) From: Menglong Dong X-Google-Original-From: Menglong Dong To: ast@kernel.org Cc: bpf@vger.kernel.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, jiang.biao@linux.dev Subject: [PATCH RFC bpf-next 3/3] selftests/bpf: add testcase for probe read fault Date: Sat, 27 Sep 2025 14:12:10 +0800 Message-ID: <20250927061210.194502-4-menglong.dong@linux.dev> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20250927061210.194502-1-menglong.dong@linux.dev> References: <20250927061210.194502-1-menglong.dong@linux.dev> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add testcase for probe read fault to stream.c. Signed-off-by: Menglong Dong --- .../testing/selftests/bpf/prog_tests/stream.c | 22 ++++++++++++++++++- tools/testing/selftests/bpf/progs/stream.c | 21 ++++++++++++++++++ 2 files changed, 42 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/bpf/prog_tests/stream.c b/tools/testin= g/selftests/bpf/prog_tests/stream.c index c3cce5c292bd..81fd258b97e0 100644 --- a/tools/testing/selftests/bpf/prog_tests/stream.c +++ b/tools/testing/selftests/bpf/prog_tests/stream.c @@ -72,7 +72,8 @@ static void test_address(struct bpf_program *prog, unsign= ed long *fault_addr_p) ASSERT_OK(ret, "ret"); ASSERT_OK(opts.retval, "retval"); =20 - sprintf(fault_addr, "0x%lx", *fault_addr_p); + if (fault_addr_p) + sprintf(fault_addr, "0x%lx", *fault_addr_p); =20 ret =3D bpf_prog_stream_read(prog_fd, BPF_STREAM_STDERR, buf, sizeof(buf)= , &ropts); ASSERT_GT(ret, 0, "stream read"); @@ -106,3 +107,22 @@ void test_stream_arena_fault_address(void) =20 stream__destroy(skel); } + +void test_stream_probe_read_fault(void) +{ + struct stream *skel; + +#if !defined(__x86_64__) + printf("%s:SKIP: probe fault reporting not supported\n", __func__); + test__skip(); + return; +#endif + + skel =3D stream__open_and_load(); + if (!ASSERT_OK_PTR(skel, "stream__open_and_load")) + return; + + test_address(skel->progs.stream_probe_read_fault, NULL); + + stream__destroy(skel); +} diff --git a/tools/testing/selftests/bpf/progs/stream.c b/tools/testing/sel= ftests/bpf/progs/stream.c index 4a5bd852f10c..290c40463522 100644 --- a/tools/testing/selftests/bpf/progs/stream.c +++ b/tools/testing/selftests/bpf/progs/stream.c @@ -7,6 +7,8 @@ #include "bpf_experimental.h" #include "bpf_arena_common.h" =20 +#define READ_ONCE(x) (*(volatile typeof(x) *)&(x)) + struct arr_elem { struct bpf_res_spin_lock lock; }; @@ -234,4 +236,23 @@ int stream_arena_callback_fault(void *ctx) return 0; } =20 +SEC("syscall") +__arch_x86_64 +__success __retval(0) +__stderr("ERROR: Probe READ access faule, insn=3D0x[0-9a-fA-F]+") +__stderr("CPU: {{[0-9]+}} UID: 0 PID: {{[0-9]+}} Comm: {{.*}}") +__stderr("Call trace:\n" +"{{([a-zA-Z_][a-zA-Z0-9_]*\\+0x[0-9a-fA-F]+/0x[0-9a-fA-F]+\n" +"|[ \t]+[^\n]+\n)*}}") +int stream_probe_read_fault(void *ctx) +{ + struct sk_buff *skb =3D bpf_core_cast((void *)0xFFFFFFFF00000000, + struct sk_buff); + + /* do the memory read */ + READ_ONCE(skb->network_header); + + return 0; +} + char _license[] SEC("license") =3D "GPL"; --=20 2.51.0