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b=eGSIDes9HXXabu2qz8xgBCNSuDW8Yf3mu642RmzF/ZLrHWWUK50kPcz8A+tZ90qm W1VQ/ifpkFL78vGJY7lq0dv5S3QjaVmdGwKs7zpBmIpB7qxCv5akk5uVtNV1ALE2N 7T2rjdHf0l3VvEsiaMGFSHdRHe5q5KDa5vz3aVJAqLyfGctjgUfK0hRwojvGnIn8u iKzlD1A/EBYDHCN0/NHB2CRJ1PoSQkbiAnTqYE93sAjKsC9856NxIZ4tm+EWFg/5L aRNcds+JVW9zP4q9oapxl6Dx7onjWhMllMkyZFjW24lG/2Vqwhip3415JUApKA+AY 5FX8WwUvgie+XN8m2g== X-UI-Sender-Class: 55c96926-9e95-11ee-ae09-1f7a4046a0f6 Received: from localhost ([69.171.251.2]) by mrelay.perfora.net (mreueus003 [74.208.5.2]) with ESMTPSA (Nemesis) id 0MTRw1-1u10Wz345v-00TJiA; Sun, 26 Jan 2025 17:39:14 +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 v5 3/3] selftests/bpf: Add tests for bpf_copy_from_user_task_str Date: Sun, 26 Jan 2025 08:38:57 -0800 Message-ID: <20250126163857.410463-3-linux@jordanrome.com> X-Mailer: git-send-email 2.43.5 In-Reply-To: <20250126163857.410463-1-linux@jordanrome.com> References: <20250126163857.410463-1-linux@jordanrome.com> MIME-Version: 1.0 X-Provags-ID: V03:K1:Y4ImCJYxkXxhv//QeM5S0+v+VgqZgGrUJJbbP1K2SrS3OmxE8XW oPYBfrXtJyay6rHriTTPP76O1o9PFV+g13N7bIbvycqUPKx63sc4wywhBimmZ2leMJ1VXfh rIgWmJMaWqxitLinPL+BBEa+d/FDcFgmmpG8wIkljcNmv6jW6kD+d25CpW71bwsq0QfXQ5p tqDgRJZxiZzukzNdEANnQ== UI-OutboundReport: notjunk:1;M01:P0:H4ez791Qrjs=;Ylegpb6R1+fiJm35rOlbfl/wW8v LAH8kA7ryzlLPAWR1Tsxb0oi8rl1mQ8Hniww0MjOA9tIeNtbhfOx0z9gRkI+/oKltkp/rhNs8 YhhgWsSsSK06YCvn80n78y1ne2zJkaguzScJydg7kdppSlnPECI8JmQStigAT8gr0nvmbrqgv yM2EEg9iiILf2daHTiszQ1QtzmhOqB4TU1VSWp6Nwn3YpIa+2PD0YJKhfdWj9QkTp+3JQOGgU SKn5GcxjBpWDyUuBUhdShvFA6QXY7Y0S3xjsUM9QTEbnszsiZ5b90Qth7uHdWnuXDhcos+pVh UpJH6TOztzz+zQDxKFwfrkte0RnzQc4pU3rai1btTOKNb+XTF9Yl4DiWwZzTS4H6IeO4Yc4oq 41VydEm34m05ErF23/SSVIx02DPxATiSbzYXFefAdCTKgt2iSII5QOa4uNWrzcW9uiI9bmBbB 2pKMDT9TINrtQioqi9SaSZXSsf4OkPq2/qEfuF9HffAJDCSDVxMrPjpVTwrahzM2C0F/fW+W9 ZVl3So6DviMFYl7wmf4RZaPeWvbB2GV4CVEcgB7C97d/m1WV2bhQxe5dth4ylhg2XAN6Uye5P i88y8KhPAMtGtufhinq7oQ73YwZMdp/0uvMUINHMIRNJf/4Bf1peaYiruJuiyHbNiIMd3h5H2 M5Muav2wPMr2tA7ry23ACLIbdHVh0e4MxNCDGZKrMhUCOso000j2wTRXLBem+A+PqRmCZ98C/ LNEW5u2hsk1aT2ssSWlP/GoITNeyxXjhgv2Rt8EueP2Vsbv40SmoeYydHUad+xzDx7zXFMYc3 Tu417gHCrWbb1bBZFP7Mb9/WfEeaDIgvUjLh/cmqXrebJiVq7mSu1IVnKiU7xWt1UkXLjkg1l LF01X9EL7HtS7c42rvh/Ek9/LCabRH2Ub/sWAVvmNtPhDhjS9A59SWut4KSRBeWYT+AaoEa7E 3lWgzba0W19kxnylCRVnpZHVmdCm8HvHipslP8vc0BbLlP6hmpht7d+Rk/bNjsMjCfiiERyt+ 2WDRjUs6dcRlK1/oQtLgnR6fOe+7VIiFAZsCzRONUyGOT9kHJjsRVXVV2GekWeO6YpmfAi/f6 DNC2Yz86VJHbfiMsRQk9dlooikNCSNOSgZolj718pA+D+0Z8sz4Q== X-Rspam-User: X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: CE57A180009 X-Stat-Signature: y8xutzxj64fc3cxiwur4e14qt3czpw9c X-HE-Tag: 1737909570-792681 X-HE-Meta: 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 Y9DDvu9H PzmsUZH7MsnGSOLS8fRf/OX04FVVehZprSZvfXSdgIOo0qgtAAKdhRguWtYQqUsr7AzujFo1wN4Rhn9DxRvrlVjQMrpb0Q9m3zL6m3TRZzBOH3y3mDJmoowc+HQ7CTdRu6v/PmjQ6aP7jL0S/9AgGnD8kpOfLvZshykEc5V4AWxUfYoR2UR7saNzZVhJfwZQakgJeUdW/9gUVFOiB3/Cw9PWox+Ydu8Mes6EABpD0oRQv+G9ge7N9EClJx3srjAExWIr9WxceKLfvN39eoXYwqybVE9POX+d85jOfAQqP5zvdvFw55LwE+X+Z/iLc4x07C9ua6VqY9HqHD1DLU6n0JstWB+ewQJL/sstyeGLvTQy4Rw01OExOVILgjpUQO62dcuuE 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 | 110 ++++++++++++++++++ .../selftests/bpf/progs/read_vsyscall.c | 11 +- 4 files changed, 188 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..d28d642a64c3 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 +90,106 @@ 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; + } + + /* Longer length than the string past a page boundary */ + ret = bpf_copy_from_user_task_str(big_str1, 5000, user_ptr, task, 0); + if (bpf_strncmp(big_str1, 10, "test_data\0") != 0 || ret != 10) { + 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; }