From patchwork Mon Jul 15 17:33:27 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Puranjay Mohan X-Patchwork-Id: 13733712 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 844D91B7E9; Mon, 15 Jul 2024 17:33:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1721064823; cv=none; b=FTCLzim2Sx1ULkEnF01NpCk6DUcZqn5XoMsnU+p+aD3vzaLtLvvSKee6JveepkhJKnuuua/T1WdgQDsMMDwFcCISWPnRBVxOXC5NwxZS0pCyDMkGeQzVdcGtsk4fHquE+Jrc7YpRAYITlXTfIOzqeiFy6TPhFebAS6sK6Rp/Tr0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1721064823; c=relaxed/simple; bh=H1Z+U4NzD8V5y3jhPonZ2ny9+fMUdenCqzkw1TQoFiM=; h=From:To:Subject:Date:Message-Id:MIME-Version; b=X9p2z/9cKbPJBKCiaIGWRe9Xpqv5hxv6VnLNzabBRXII9dtBNSn9EAoNezvgyNHW8CMbLk5ssiRx7sgYKKro+RAQqCq0hxRqc6qFmokz+UX6sU9HFTwpJjZc0MU9MfcBHLUu/Xa/rLvhfVMLiyx+PdZUBaBLJtrZqgItd01n9NQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=QakOI8zf; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="QakOI8zf" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D11B1C4AF0A; Mon, 15 Jul 2024 17:33:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1721064823; bh=H1Z+U4NzD8V5y3jhPonZ2ny9+fMUdenCqzkw1TQoFiM=; h=From:To:Subject:Date:From; b=QakOI8zfWtMkVmM5isjuFMuunQ6IdquRQqlyYVj51uRZ3kjfn6unV0km1DpRi+0tE 0qEQ6PcAS46FAo8leGiKnq9QBcGqBsBy/rYWlWJr9rVk9fAAZPcDtP5/au30VNK/Rz 1mEf1sHD0cwn/JMd13VPlFJFsTDLd3ltXgfBIMw/GAYNEGnJnlEJCKCKqOQFXnq5i2 oJg/owztkfJgLhojWPVEkkgCmCyzF7HKEnJhvOY0qbnkwaMb/0plxV0wcKiAPsic4m ExDyO4l3VO7XuS7E3xIEQnLRCwRdMvwgAUrleFQnZ4JEGZwoBx+KNBdjy6aqx3R3Xa h/kx0hpp4Ailg== From: Puranjay Mohan To: Andrii Nakryiko , Eduard Zingerman , Mykola Lysenko , Alexei Starovoitov , Daniel Borkmann , Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , Hao Luo , Jiri Olsa , Shuah Khan , Puranjay Mohan , bpf@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH bpf-next] selftests/bpf: fexit_sleep: fix stack allocation for arm64 Date: Mon, 15 Jul 2024 17:33:27 +0000 Message-Id: <20240715173327.8657-1-puranjay@kernel.org> X-Mailer: git-send-email 2.40.1 Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On ARM64 the stack pointer should be aligned at a 16 byte boundary or the SPAlignmentFault can occur. The fexit_sleep selftest allocates the stack for the child process as a character array, this is not guaranteed to be aligned at 16 bytes. Because of the SPAlignmentFault, the child process is killed before it can do the nanosleep call and hence fentry_cnt remains as 0. This causes the main thread to hang on the following line: while (READ_ONCE(fexit_skel->bss->fentry_cnt) != 2); Fix this by allocating the stack using mmap() as described in the example in the man page of clone(). Remove the fexit_sleep test from the DENYLIST of arm64. Signed-off-by: Puranjay Mohan --- tools/testing/selftests/bpf/DENYLIST.aarch64 | 1 - tools/testing/selftests/bpf/prog_tests/fexit_sleep.c | 8 +++++++- 2 files changed, 7 insertions(+), 2 deletions(-) diff --git a/tools/testing/selftests/bpf/DENYLIST.aarch64 b/tools/testing/selftests/bpf/DENYLIST.aarch64 index 3c7c3e79aa931..901349da680fa 100644 --- a/tools/testing/selftests/bpf/DENYLIST.aarch64 +++ b/tools/testing/selftests/bpf/DENYLIST.aarch64 @@ -1,6 +1,5 @@ bpf_cookie/multi_kprobe_attach_api # kprobe_multi_link_api_subtest:FAIL:fentry_raw_skel_load unexpected error: -3 bpf_cookie/multi_kprobe_link_api # kprobe_multi_link_api_subtest:FAIL:fentry_raw_skel_load unexpected error: -3 -fexit_sleep # The test never returns. The remaining tests cannot start. kprobe_multi_bench_attach # needs CONFIG_FPROBE kprobe_multi_test # needs CONFIG_FPROBE module_attach # prog 'kprobe_multi': failed to auto-attach: -95 diff --git a/tools/testing/selftests/bpf/prog_tests/fexit_sleep.c b/tools/testing/selftests/bpf/prog_tests/fexit_sleep.c index f949647dbbc21..552a0875ca6db 100644 --- a/tools/testing/selftests/bpf/prog_tests/fexit_sleep.c +++ b/tools/testing/selftests/bpf/prog_tests/fexit_sleep.c @@ -21,13 +21,13 @@ static int do_sleep(void *skel) } #define STACK_SIZE (1024 * 1024) -static char child_stack[STACK_SIZE]; void test_fexit_sleep(void) { struct fexit_sleep_lskel *fexit_skel = NULL; int wstatus, duration = 0; pid_t cpid; + char *child_stack = NULL; int err, fexit_cnt; fexit_skel = fexit_sleep_lskel__open_and_load(); @@ -38,6 +38,11 @@ void test_fexit_sleep(void) if (CHECK(err, "fexit_attach", "fexit attach failed: %d\n", err)) goto cleanup; + child_stack = mmap(NULL, STACK_SIZE, PROT_READ | PROT_WRITE, MAP_PRIVATE | + MAP_ANONYMOUS | MAP_STACK, -1, 0); + if (!ASSERT_NEQ(child_stack, MAP_FAILED, "mmap")) + goto cleanup; + cpid = clone(do_sleep, child_stack + STACK_SIZE, CLONE_FILES | SIGCHLD, fexit_skel); if (CHECK(cpid == -1, "clone", "%s\n", strerror(errno))) goto cleanup; @@ -78,5 +83,6 @@ void test_fexit_sleep(void) goto cleanup; cleanup: + munmap(child_stack, STACK_SIZE); fexit_sleep_lskel__destroy(fexit_skel); }