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bh=KpviBqlgyeWJdrpOQQK4620AQohGgJ+OsCjzKJgQy1I=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=Gyxk57mYIyIEdkkVmCrAfTFRs3GjysEwHwcTZ6DL3NXxmhBoFxbpzpQIWFWp4zqLF e6tBJ/sClz8ZlSQyJJifkWOQ2yV6uk4sennpvHqSdGYau1Jkf6GNqNYk1wBA+phZqG dUXcR06sMhUzCMXmK2RZXk4auIX7Y+7ig0U3BWlAKVtv4MU5VaNs/rGrp8GXuFGd4B WgmWPSCc0692HcWquEo3rDdy+VyL+K4YeiaTz297XpiOrCcjvo1xeHJ9HrxkO0mccA MA1qFCIBYc2LtKGIV0uihIAy+dAQJIJWeozBFks49dRMdbcvq884GJfL8ksiDZCR8e vI1qvLfo9BUew== From: Jiri Olsa To: Alexei Starovoitov , Daniel Borkmann Cc: bpf@vger.kernel.org, linux-mm@kvack.org, Andrii Nakryiko , Eduard Zingerman , Kumar Kartikeya Dwivedi , Lorenzo Stoakes , John Fastabend , Federico Di Pierro Subject: [PATCHv3 bpf-next 5/8] selftests/bpf: Test user memory mmap kfuncs Date: Thu, 5 Nov 2026 11:23:39 +0100 Message-ID: <20261105102343.311331-6-jolsa@kernel.org> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261105102343.311331-1-jolsa@kernel.org> References: <20261105102343.311331-1-jolsa@kernel.org> X-Archived-By: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: w55dprk1h1tsomsbsczzxufm9trzxmrd X-Rspam-User: X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: E763D100006 X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_PASS, SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=4.0.1 X-HE-Tag: 1793874278-5396 X-HE-Meta: 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 ZdaPDAl6 4WBlA1KvK5t7oErXe8lhzrBm7/jUMuXhe89f8CM283wxxHnCFkUKztyNI8akiBQ6xT7xj50RtJ5IDIK2CLnSlAhnJNGqx1QEZEhONaGCqOUMu8gyot0TbSC9OPbvLtrwB7kQwVljY6VvPMLtEgWHNX8Y3jPyr9hB5z9kHMRU12RoT+/ZWb8oCrNJfE645FDnQN4SlkTLJ0xbC1Ul9hUvVqn0Zhi0lQE6OuDoiyncfPx9/xdfK0gYwzujJxf9CYgTMFXBkDRvco7K/3oe0JFYgnqCLjcFR4s5aFOJcfXlXzY9g3TG817VzfGm0Et/zNLp8N6M1L08d27UkLXq14EmWlOv96g== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 Add BPF selftests for bpf_user_anon_mmap and bpf_user_munmap from a sleepable uprobe. Check that created mappings have the requested permissions and that unmapped addresses are no longer mapped. Assisted-by: Codex:GPT-6 Signed-off-by: Jiri Olsa --- .../selftests/bpf/prog_tests/user_mem.c | 111 ++++++++++++++++++ tools/testing/selftests/bpf/progs/user_mem.c | 43 +++++++ 2 files changed, 154 insertions(+) create mode 100644 tools/testing/selftests/bpf/prog_tests/user_mem.c create mode 100644 tools/testing/selftests/bpf/progs/user_mem.c diff --git a/tools/testing/selftests/bpf/prog_tests/user_mem.c b/tools/testing/selftests/bpf/prog_tests/user_mem.c new file mode 100644 index 000000000000..eadf668f7056 --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/user_mem.c @@ -0,0 +1,111 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include +#include +#include + +#include "user_mem.skel.h" +#include "trace_helpers.h" + +enum { + USER_MEM_MMAP = 1, + USER_MEM_UNMAP, +}; + +static noinline void user_mem_trigger(void) +{ + asm volatile ("" ::: "memory"); +} + +static bool check_user_mem_vma(void *addr, unsigned long size, const char *perms) +{ + size_t start, end; + char vma_perms[5]; + int err; + + err = get_procmap_info(addr, &start, &end, vma_perms); + if (!ASSERT_OK(err, "user_mem_vma")) + return false; + + /* VMA can be merged, so ensure it covers at least the requested range. */ + if (!ASSERT_GE(end - (size_t)addr, size, "vma_size")) + return false; + + return ASSERT_STREQ(vma_perms, perms, "vma_perms"); +} + +static bool check_user_mem_unmapped(void *addr) +{ + size_t start, end; + int err; + + err = get_procmap_info(addr, &start, &end, NULL); + return ASSERT_EQ(err, -ESRCH, "user_mem_unmapped"); +} + +static bool user_mem_mmap(struct user_mem *skel, unsigned long len, + unsigned long prot, unsigned long *addr) +{ + skel->bss->map_len = len; + skel->bss->map_prot = prot; + skel->bss->action = USER_MEM_MMAP; + user_mem_trigger(); + + /* vm_mmap encodes errors in the top MAX_ERRNO unsigned-long values. */ + if (!ASSERT_LT(skel->bss->user_addr, -4095UL, "user_addr")) + return false; + + *addr = skel->bss->user_addr; + return true; +} + +static bool user_mem_munmap(struct user_mem *skel, unsigned long addr, + unsigned long len) +{ + skel->bss->user_addr = addr; + skel->bss->map_len = len; + skel->bss->action = USER_MEM_UNMAP; + user_mem_trigger(); + + return ASSERT_OK(skel->bss->ret, "user_munmap"); +} + +static void test_mapping(struct user_mem *skel) +{ + long page_size = sysconf(_SC_PAGESIZE); + const unsigned long len = page_size * 3; + unsigned long addr = ~0UL; + + if (!user_mem_mmap(skel, len, PROT_READ | PROT_WRITE, &addr)) + goto out; + if (!check_user_mem_vma((void *)addr, len, "rw-p")) + goto out; + if (!user_mem_munmap(skel, addr, len)) + goto out; + if (!check_user_mem_unmapped((void *)addr)) + goto out; + addr = ~0UL; + +out: + if (addr != ~0UL) + munmap((void *)addr, len); +} + +void test_user_mem(void) +{ + struct user_mem *skel; + + skel = user_mem__open_and_load(); + if (!ASSERT_OK_PTR(skel, "open_and_load")) + return; + + skel->bss->monitored_pid = getpid(); + if (!ASSERT_OK(user_mem__attach(skel), "attach")) + goto out; + + if (test__start_subtest("mapping")) + test_mapping(skel); + +out: + user_mem__destroy(skel); +} diff --git a/tools/testing/selftests/bpf/progs/user_mem.c b/tools/testing/selftests/bpf/progs/user_mem.c new file mode 100644 index 000000000000..e3b0689f5f2a --- /dev/null +++ b/tools/testing/selftests/bpf/progs/user_mem.c @@ -0,0 +1,43 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include +#include +#include + +#include "bpf_misc.h" + +char _license[] SEC("license") = "GPL"; + +extern unsigned long bpf_user_anon_mmap(unsigned long len, unsigned long prot) __ksym; +extern int bpf_user_munmap(unsigned long addr, unsigned long len) __ksym; + +enum { + USER_MEM_MMAP = 1, + USER_MEM_UNMAP, +}; + +int monitored_pid; +int action; +int ret; + +unsigned long user_addr; +unsigned long map_len; +unsigned long map_prot; + +SEC("uprobe.s//proc/self/exe:user_mem_trigger") +int user_mem_test(struct pt_regs *ctx) +{ + if ((bpf_get_current_pid_tgid() >> 32) != monitored_pid) + return 0; + + switch (action) { + case USER_MEM_MMAP: + user_addr = bpf_user_anon_mmap(map_len, map_prot); + break; + case USER_MEM_UNMAP: + ret = bpf_user_munmap(user_addr, map_len); + break; + } + + return 0; +} -- 2.43.0