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b=CP0mGe2klQy9gKrznC1GQtr7pXduN6Cd48fjo+tOj7KW2iHF+yfij0T2F1HTiV9w MyySou11mP3+XtbRAqGiX+WJ0IC9tQ8P8tzZ584qyq0uRbRTbs9C0XwW8atjtMnOA AqK5RY7AAEhWvWMrJBvsT+mFC95+xWL7hmpSGvTpSM1m0CWFepeZvF1Ex7Q0PQdO2 +7V7ugcJcew4vsb5JzsrvT2bI6FxMFL3IEC5hNNxUva9oaVlBTQ1ILdUTTvhFtr0J SOSE8vFdJuxcOJY2e6lPk76rIJTbj8axGhswvn7cMtYnMh6ph47wNCEYcxLOMzIKc ishHeFqJpfsmMWYXAw== X-UI-Sender-Class: 55c96926-9e95-11ee-ae09-1f7a4046a0f6 Received: from localhost ([69.171.251.30]) by mrelay.perfora.net (mreueus002 [74.208.5.2]) with ESMTPSA (Nemesis) id 0MWlFl-1tyi5z3EHz-00I128; Fri, 24 Jan 2025 19:33:12 +0100 From: Jordan Rome To: bpf@vger.kernel.org Cc: linux-mm@kvack.org, Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Kernel Team , Andrew Morton , Shakeel Butt , Alexander Potapenko Subject: [bpf-next v3 3/3] selftests/bpf: Add tests for bpf_copy_from_user_task_str Date: Fri, 24 Jan 2025 10:33:03 -0800 Message-ID: <20250124183303.2019147-2-linux@jordanrome.com> X-Mailer: git-send-email 2.43.5 In-Reply-To: <20250124183303.2019147-1-linux@jordanrome.com> References: <20250124183303.2019147-1-linux@jordanrome.com> MIME-Version: 1.0 X-Provags-ID: V03:K1:WfqbFLPdYyNudQtsm1yh/2tFoS3iCnwEbzAyw3rPVOirMuR2YUi sXqN1JtLOow+sVqSGcfVpbh1c+5TfXyEfjoaCLQuySnYFPurxIAHjzVNI2D1vPtBbgqn2LX O+P4sdNZB1E8g4KiyMZ1+eaZhJulVF+phtZhiUkuE98GChRl7PO+aVfumRJt6KlYyEdFRvR edD5pl7z72OEpH9+PD4qQ== UI-OutboundReport: notjunk:1;M01:P0:Nfc8MBLV+1o=;ePVf57x9BMm4fhnnhPhYeBwHIJn yQiDHQxknAecuaiJT3MuRHV4PJCwMub0lEgFomVjbPTC0+c3S0MjVpjlMmR0WY05O695jzTmT WauNlJdjzTD3rBQI8aDaGg+MpOWjyGwC3FC96MehF9gtgUMR+5m5l1HY8tSgF8OV+BBGugHUG 2iSNt7Mlr1e3l2+fm6YtN3muDD7Pwm8T1CX0o3A1LeAvt4LVsMBeQuzXB+Wz57bberBPYwSb6 awtaz7xN35CWfVdq8+fpIGUU3VXkGf1sSP+fi0QQv2YxMJo13oC3soHWjSN5qmreEXWJWqzdJ QIsQ9s6Dk3sP4a475ObKuviAV/sEgFK+7L85UxsOuS0a+UxXnCxSkFgiHspDsHn/FwMXCI9Ib 1a54EIS4NoijwNjCHLTGe1AuhhC68WlwHhcoHh8z1lRzVI1Zw/r+/eRmJmn41rve0I6vNqBHi EH/sHyRmGQE/Pv8xv8rupPV7Ouzi5vYogH18sR2bDulNy5QX+YKo7hOgYQEx4oSs5dpivY7Nh TLtxBL+0ryyyZa5fRgRHpbN94VCIDU41+Y8Vvrrqi7c1igjDU5HT2iseW+vWYmmqzi24tiV/o /yLWgMGsxKKWkJ6IHRLzjKa1KHzm/Upn/SKoKYXIeVHiNGZuCXluOSl8gZfGfN4PKt/nemSms A/DwC8yAu3aQc/Pi6WgPfqACL3YKF1w1STmST83T2rttgoqOY8AtR2tg3+oNYwg+aDn9HOZKn zPT9UY/8lsLWGdx/dicapPWKJ+LuME/MR1ZiXZGPQBSIsXpmoVWzk1x9kUdSiQbpv7Jy6UUxi w0bX8GpYn5yc5QFpPGXnp61UN1tOr7FE3W3p+M+NfcxJ5bYhOpE17HV94zz9f8bEdENZrjQAK Z28kEvrOkH586ftsjwUqKt3ojyrgkcApDQG2P0qS4KNhXmHubjCXp4qMJ/jtHXDQbnZVstAwi yeSIecYqPgeoQdc9DyYIF+kooj7OUKDm8zmADuUd/EQo4K9S6WSkQu4tMlu7vzsww8ni/qAkv 0Kwgqjz1lC6lEMSMZ6ylaTZwt1Yn5mo6V7EDo5L4mtEMyOqzp0DM9ufXxoWR+Bcl+Hk+tuYRR 4Z+UeobPbj3caPK8CTr2S7EYyHSLbVmqNLyT14R8TdjqqCA5cFzD9IBElsgyzxGxsKN2QJSim /1/W8EfYIbPEIBmYOo05/FisZzsbapHX4X1a/Kxz6VRYTH3QTjNJJq7sL8xghX9CUc2wZxF5F ojYQkZ8aVZLW0PdFPVAeTcDSqCEU60zUKg== X-Rspamd-Queue-Id: 39836100019 X-Stat-Signature: rwikfwsumtceu513h3bom5kirf5wqjoh X-Rspamd-Server: rspam08 X-Rspam-User: X-HE-Tag: 1737743613-202636 X-HE-Meta: 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 SvSHgtFG ZOQfcSA4GQq6wBc12vOhJskvI4Nc93WxC0/BlCoXPrbF2umv2aGKQUM0xU5RBcYm2AwNEAKhBOiQwRzl5vbcDU8MQwmGH+W+JJcYV1GRrBseZvls+LGiNp4OFwada7ourQA6kglVB0KciZHSRWTuZyf4pDRCTeUM5W+A2EE4HAkVbGfmGdlU+IrTp8o/FIWM2rS+jLMYQwF20OuwOz0xMK8Zl0c5OSPpFR2zp60HTh5tMoX4lmffU1ilXcdQJyJNlqCb3RsDoD6SG9nYX+uha6feq0KW7aA1a4KL7WJT0tWBWkJEFZiifuUB5foItDksJmQ83YaTms3iBVyYPzWQTtGWuxFkFBpTuOp+GLAA69XTGoKilICBTpB7fletj4MDtgf/U X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: This adds tests for both the happy path and the error path (with and without the BPF_F_PAD_ZEROS flag). Signed-off-by: Jordan Rome --- .../selftests/bpf/prog_tests/bpf_iter.c | 68 ++++++++++++ .../selftests/bpf/prog_tests/read_vsyscall.c | 1 + .../selftests/bpf/progs/bpf_iter_tasks.c | 103 ++++++++++++++++++ .../selftests/bpf/progs/read_vsyscall.c | 11 +- 4 files changed, 181 insertions(+), 2 deletions(-) -- 2.43.5 diff --git a/tools/testing/selftests/bpf/prog_tests/bpf_iter.c b/tools/testing/selftests/bpf/prog_tests/bpf_iter.c index 6f1bfacd7375..add4a18c33bd 100644 --- a/tools/testing/selftests/bpf/prog_tests/bpf_iter.c +++ b/tools/testing/selftests/bpf/prog_tests/bpf_iter.c @@ -323,19 +323,87 @@ static void test_task_pidfd(void) static void test_task_sleepable(void) { struct bpf_iter_tasks *skel; + int pid, status, err, data_pipe[2], finish_pipe[2], c; + char *test_data = NULL; + char *test_data_long = NULL; + char *data[2]; + + if (!ASSERT_OK(pipe(data_pipe), "data_pipe") || + !ASSERT_OK(pipe(finish_pipe), "finish_pipe")) + return; skel = bpf_iter_tasks__open_and_load(); if (!ASSERT_OK_PTR(skel, "bpf_iter_tasks__open_and_load")) return; + pid = fork(); + if (!ASSERT_GE(pid, 0, "fork")) + return; + + if (pid == 0) { + /* child */ + close(data_pipe[0]); + close(finish_pipe[1]); + + test_data = malloc(sizeof(char) * 10); + strncpy(test_data, "test_data", 10); + test_data[9] = '\0'; + + test_data_long = malloc(sizeof(char) * 5000); + for (int i = 0; i < 5000; ++i) { + if (i % 2 == 0) + test_data_long[i] = 'b'; + else + test_data_long[i] = 'a'; + } + test_data_long[4999] = '\0'; + + data[0] = test_data; + data[1] = test_data_long; + + write(data_pipe[1], &data, sizeof(data)); + + /* keep child alive until after the test */ + err = read(finish_pipe[0], &c, 1); + if (err != 1) + exit(-1); + + close(data_pipe[1]); + close(finish_pipe[0]); + _exit(0); + } + + /* parent */ + close(data_pipe[1]); + close(finish_pipe[0]); + + err = read(data_pipe[0], &data, sizeof(data)); + ASSERT_EQ(err, sizeof(data), "read_check"); + + skel->bss->user_ptr = data[0]; + skel->bss->user_ptr_long = data[1]; + skel->bss->pid = pid; + do_dummy_read(skel->progs.dump_task_sleepable); ASSERT_GT(skel->bss->num_expected_failure_copy_from_user_task, 0, "num_expected_failure_copy_from_user_task"); ASSERT_GT(skel->bss->num_success_copy_from_user_task, 0, "num_success_copy_from_user_task"); + ASSERT_GT(skel->bss->num_expected_failure_copy_from_user_task_str, 0, + "num_expected_failure_copy_from_user_task_str"); + ASSERT_GT(skel->bss->num_success_copy_from_user_task_str, 0, + "num_success_copy_from_user_task_str"); bpf_iter_tasks__destroy(skel); + + write(finish_pipe[1], &c, 1); + err = waitpid(pid, &status, 0); + ASSERT_EQ(err, pid, "waitpid"); + ASSERT_EQ(status, 0, "zero_child_exit"); + + close(data_pipe[0]); + close(finish_pipe[1]); } static void test_task_stack(void) diff --git a/tools/testing/selftests/bpf/prog_tests/read_vsyscall.c b/tools/testing/selftests/bpf/prog_tests/read_vsyscall.c index c7b9ba8b1d06..a8d1eaa67020 100644 --- a/tools/testing/selftests/bpf/prog_tests/read_vsyscall.c +++ b/tools/testing/selftests/bpf/prog_tests/read_vsyscall.c @@ -24,6 +24,7 @@ struct read_ret_desc { { .name = "copy_from_user", .ret = -EFAULT }, { .name = "copy_from_user_task", .ret = -EFAULT }, { .name = "copy_from_user_str", .ret = -EFAULT }, + { .name = "copy_from_user_task_str", .ret = -EFAULT }, }; void test_read_vsyscall(void) diff --git a/tools/testing/selftests/bpf/progs/bpf_iter_tasks.c b/tools/testing/selftests/bpf/progs/bpf_iter_tasks.c index bc10c4e4b4fa..e4b80260e9c5 100644 --- a/tools/testing/selftests/bpf/progs/bpf_iter_tasks.c +++ b/tools/testing/selftests/bpf/progs/bpf_iter_tasks.c @@ -9,6 +9,13 @@ char _license[] SEC("license") = "GPL"; uint32_t tid = 0; int num_unknown_tid = 0; int num_known_tid = 0; +void *user_ptr = 0; +void *user_ptr_long = 0; +uint32_t pid = 0; + +static char big_str1[5000]; +static char big_str2[5005]; +static char big_str3[4996]; SEC("iter/task") int dump_task(struct bpf_iter__task *ctx) @@ -35,7 +42,9 @@ int dump_task(struct bpf_iter__task *ctx) } int num_expected_failure_copy_from_user_task = 0; +int num_expected_failure_copy_from_user_task_str = 0; int num_success_copy_from_user_task = 0; +int num_success_copy_from_user_task_str = 0; SEC("iter.s/task") int dump_task_sleepable(struct bpf_iter__task *ctx) @@ -44,6 +53,9 @@ int dump_task_sleepable(struct bpf_iter__task *ctx) struct task_struct *task = ctx->task; static const char info[] = " === END ==="; struct pt_regs *regs; + char task_str1[10] = "aaaaaaaaaa"; + char task_str2[10], task_str3[10]; + char task_str4[20] = "aaaaaaaaaaaaaaaaaaaa"; void *ptr; uint32_t user_data = 0; int ret; @@ -78,8 +90,99 @@ int dump_task_sleepable(struct bpf_iter__task *ctx) BPF_SEQ_PRINTF(seq, "%s\n", info); return 0; } + ++num_success_copy_from_user_task; + /* Read an invalid pointer and ensure we get an error */ + ptr = NULL; + ret = bpf_copy_from_user_task_str((char *)task_str1, sizeof(task_str1), ptr, task, 0); + if (ret >= 0 || task_str1[9] != 'a') { + BPF_SEQ_PRINTF(seq, "%s\n", info); + return 0; + } + + /* Read an invalid pointer and ensure we get error with pad zeros flag */ + ptr = NULL; + ret = bpf_copy_from_user_task_str((char *)task_str1, sizeof(task_str1), + ptr, task, BPF_F_PAD_ZEROS); + if (ret >= 0 || task_str1[9] != '\0') { + BPF_SEQ_PRINTF(seq, "%s\n", info); + return 0; + } + + ++num_expected_failure_copy_from_user_task_str; + + /* Same length as the string */ + ret = bpf_copy_from_user_task_str((char *)task_str2, 10, user_ptr, task, 0); + /* only need to do the task pid check once */ + if (bpf_strncmp(task_str2, 10, "test_data\0") != 0 || ret != 10 || task->tgid != pid) { + BPF_SEQ_PRINTF(seq, "%s\n", info); + return 0; + } + + /* Shorter length than the string */ + ret = bpf_copy_from_user_task_str((char *)task_str3, 2, user_ptr, task, 0); + if (bpf_strncmp(task_str3, 2, "t\0") != 0 || ret != 2) { + BPF_SEQ_PRINTF(seq, "%s\n", info); + return 0; + } + + /* Longer length than the string */ + ret = bpf_copy_from_user_task_str((char *)task_str4, 20, user_ptr, task, 0); + if (bpf_strncmp(task_str4, 10, "test_data\0") != 0 || ret != 10 + || task_str4[sizeof(task_str4) - 1] != 'a') { + BPF_SEQ_PRINTF(seq, "%s\n", info); + return 0; + } + + /* Longer length than the string with pad zeros flag */ + ret = bpf_copy_from_user_task_str((char *)task_str4, 20, user_ptr, task, BPF_F_PAD_ZEROS); + if (bpf_strncmp(task_str4, 10, "test_data\0") != 0 || ret != 10 + || task_str4[sizeof(task_str4) - 1] != '\0') { + BPF_SEQ_PRINTF(seq, "%s\n", info); + return 0; + } + + /* String that crosses a page boundary */ + ret = bpf_copy_from_user_task_str(big_str1, 5000, user_ptr_long, task, BPF_F_PAD_ZEROS); + if (bpf_strncmp(big_str1, 4, "baba") != 0 || ret != 5000 + || bpf_strncmp(big_str1 + 4996, 4, "bab\0") != 0) { + BPF_SEQ_PRINTF(seq, "%s\n", info); + return 0; + } + + for (int i = 0; i < 4999; ++i) { + if (i % 2 == 0) { + if (big_str1[i] != 'b') { + BPF_SEQ_PRINTF(seq, "%s\n", info); + return 0; + } + } else { + if (big_str1[i] != 'a') { + BPF_SEQ_PRINTF(seq, "%s\n", info); + return 0; + } + } + } + + /* Longer length than the string that crosses a page boundary */ + ret = bpf_copy_from_user_task_str(big_str2, 5005, user_ptr_long, task, BPF_F_PAD_ZEROS); + if (bpf_strncmp(big_str2, 4, "baba") != 0 || ret != 5000 + || bpf_strncmp(big_str2 + 4996, 5, "bab\0\0") != 0) { + BPF_SEQ_PRINTF(seq, "%s\n", info); + return 0; + } + + /* Shorter length than the string that crosses a page boundary */ + ret = bpf_copy_from_user_task_str(big_str3, 4996, user_ptr_long, task, 0); + if (bpf_strncmp(big_str3, 4, "baba") != 0 || ret != 4996 + || bpf_strncmp(big_str3 + 4992, 4, "bab\0") != 0) { + BPF_SEQ_PRINTF(seq, "%s\n", info); + return 0; + } + + ++num_success_copy_from_user_task_str; + if (ctx->meta->seq_num == 0) BPF_SEQ_PRINTF(seq, " tgid gid data\n"); diff --git a/tools/testing/selftests/bpf/progs/read_vsyscall.c b/tools/testing/selftests/bpf/progs/read_vsyscall.c index 39ebef430059..395591374d4f 100644 --- a/tools/testing/selftests/bpf/progs/read_vsyscall.c +++ b/tools/testing/selftests/bpf/progs/read_vsyscall.c @@ -8,14 +8,16 @@ int target_pid = 0; void *user_ptr = 0; -int read_ret[9]; +int read_ret[10]; char _license[] SEC("license") = "GPL"; /* - * This is the only kfunc, the others are helpers + * These are the kfuncs, the others are helpers */ int bpf_copy_from_user_str(void *dst, u32, const void *, u64) __weak __ksym; +int bpf_copy_from_user_task_str(void *dst, u32, const void *, + struct task_struct *, u64) __weak __ksym; SEC("fentry/" SYS_PREFIX "sys_nanosleep") int do_probe_read(void *ctx) @@ -47,6 +49,11 @@ int do_copy_from_user(void *ctx) read_ret[7] = bpf_copy_from_user_task(buf, sizeof(buf), user_ptr, bpf_get_current_task_btf(), 0); read_ret[8] = bpf_copy_from_user_str((char *)buf, sizeof(buf), user_ptr, 0); + read_ret[9] = bpf_copy_from_user_task_str((char *)buf, + sizeof(buf), + user_ptr, + bpf_get_current_task_btf(), + 0); return 0; }