From nobody Sat Feb 7 17:42:00 2026 Received: from mail-pj1-f73.google.com (mail-pj1-f73.google.com [209.85.216.73]) (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 2B06B17A2EC for ; Sun, 30 Mar 2025 21:13:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.216.73 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1743369240; cv=none; b=YQzOz+6QMAA/7Bce51TaSHb+nRtWJR0ggLIYHFKvNoXLfMImqpsrCXJwcpNdXGtxiecBCeH65DMWjE3lTVIVLPalPsfh4o0Inpqv/jwf+6CL/ePZpgNSJDrYUlKpWanmBE7Oc6Ba1rAMZ96vxZQa8EwI8g6nzPlWXU8OOnmapwY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1743369240; c=relaxed/simple; bh=tuY/QNQk/F9SugrUgSfFsgzuGaTIb2SuuPlR/76U+A8=; h=Date:Mime-Version:Message-ID:Subject:From:To:Cc:Content-Type; b=LDs1MmAAwqOwD0A27gyuPcS9RlnJpP/JBgWQPj0OSiKerVm0tfAZG7gLJduJrQaUn5Mc643notnphsbFrauJ0euCy7BzLSQBbY//dqSXkGIzZUMd2K7jXt7dnAATiF0nPW4lrWw/lcxRf4D0UdcKVdBk7AN8kBYJJgy/DJdXGU0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--cmllamas.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=MSrKarQ4; arc=none smtp.client-ip=209.85.216.73 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--cmllamas.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="MSrKarQ4" Received: by mail-pj1-f73.google.com with SMTP id 98e67ed59e1d1-30364fc706fso6202007a91.3 for ; Sun, 30 Mar 2025 14:13:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1743369238; x=1743974038; darn=vger.kernel.org; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=61IYoBnyZqJEMEpkuy3cn0SZfZ0XGPVC6El2dNeevTQ=; b=MSrKarQ4eiBdkKzw55QshBdp7cp8chyr4CABIpQ4u8jkYg/AYGqv/qvkMbcMAhYnK+ 5eIlc/xEQRM79Wf/iar2zzrRSGcrIlTboJyPb68MXKsfMYJtYBIWRpTayM61I68nFpq5 gzg2iscxRhIB6Hu6L2Z+NMO75PYGNxef3swBxsiQY1A24JiDtRe+kQa3bHprCSmini/9 Z2/7Hcx2dnI1VUeoCT55C+uo6KzfytYHEje+sw+1XGk1Jb4eRZhg5zw2Q2O7UymazgkJ s5kvnePPhFz5bXqsfDIx8anFlHggHgcL+OUIaHiR3GQ1f+JZskzyqVWHm7hdkZEr0a+O +iXA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1743369238; x=1743974038; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=61IYoBnyZqJEMEpkuy3cn0SZfZ0XGPVC6El2dNeevTQ=; b=j06lPmpEt+TqqPwBurfGFrtefZojeOZY1oeYbXrt18YBHWuhtOqqnnMYagkrMiiWhk k1FhkboIPal0qwLeszHxJKn15GHHxd+cC6fDtgOEEN8AUkycdA/+TXK0yOAb98RDVPbv 2K2/dLve1zkTc7l1k1sGsgBlEKLZRxvBec3SDHEXy8+WLDMxT4sSVD0Op+K8iD8mge+O QQ7Ebm5zX8jveBSYcEol/PBcbiOt84lDNQy0wyncA4H63mK6wYUKPFSiel5WlS8WyWzp ykxHXFn9Rant5Z4dPTrw0LcaCVVm8ZNC8ACH35O/S9iXG01cmXz/SnoA4FpoRc3Ztj/P 7uIA== X-Gm-Message-State: AOJu0YyZhrCdTDEKNa63rpSmbrjsY31mJ/2ANnvBFnUsmgRegiPepyNv 8XFVO6+WYTTgQ9h31u+x90jlRnTaA+Ojdgzi4zDtB0VOgpgnOttYPZPGyhdglaZM3tz+aJMI7iU VZylq6LFAGA== X-Google-Smtp-Source: AGHT+IExA/Qh/zET4rYRjfCGWnHQ2oDyUcaf7FrxoGsylJCTJr1cZxpuLWN9JGul9NvyF2ynMXNVsUSEXVUzfA== X-Received: from pjbqn11.prod.google.com ([2002:a17:90b:3d4b:b0:2ea:29de:af10]) (user=cmllamas job=prod-delivery.src-stubby-dispatcher) by 2002:a17:90b:2e8d:b0:2fe:99cf:f579 with SMTP id 98e67ed59e1d1-30531f7c03bmr12282871a91.4.1743369238499; Sun, 30 Mar 2025 14:13:58 -0700 (PDT) Date: Sun, 30 Mar 2025 21:13:23 +0000 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 X-Mailer: git-send-email 2.49.0.472.ge94155a9ec-goog Message-ID: <20250330211325.530677-1-cmllamas@google.com> Subject: [PATCH bpf] libbpf: Fix implicit memfd_create() for bionic From: Carlos Llamas To: bpf@vger.kernel.org, Andrii Nakryiko , Eduard Zingerman , Alexei Starovoitov , Daniel Borkmann , Alastair Robertson Cc: linux-kernel@vger.kernel.org, kernel-team@android.com, Carlos Llamas , Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Since memfd_create() is not consistently available across different bionic libc implementations, using memfd_create() directly can break some Android builds: tools/lib/bpf/linker.c:576:7: error: implicit declaration of function 'me= mfd_create' [-Werror,-Wimplicit-function-declaration] 576 | fd =3D memfd_create(filename, 0); | ^ To fix this, relocate and inline the sys_memfd_create() helper so that it can be used in "linker.c". Similar issues were previously fixed by commit 9fa5e1a180aa ("libbpf: Call memfd_create() syscall directly"). Cc: Alastair Robertson Cc: Andrii Nakryiko Fixes: 6d5e5e5d7ce1 ("libbpf: Extend linker API to support in-memory ELF fi= les") Signed-off-by: Carlos Llamas --- tools/lib/bpf/libbpf.c | 9 --------- tools/lib/bpf/libbpf_internal.h | 9 +++++++++ tools/lib/bpf/linker.c | 2 +- 3 files changed, 10 insertions(+), 10 deletions(-) diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c index 194809da5172..1f36e16461e1 100644 --- a/tools/lib/bpf/libbpf.c +++ b/tools/lib/bpf/libbpf.c @@ -1719,15 +1719,6 @@ static Elf64_Sym *find_elf_var_sym(const struct bpf_= object *obj, const char *nam return ERR_PTR(-ENOENT); } =20 -/* Some versions of Android don't provide memfd_create() in their libc - * implementation, so avoid complications and just go straight to Linux - * syscall. - */ -static int sys_memfd_create(const char *name, unsigned flags) -{ - return syscall(__NR_memfd_create, name, flags); -} - #ifndef MFD_CLOEXEC #define MFD_CLOEXEC 0x0001U #endif diff --git a/tools/lib/bpf/libbpf_internal.h b/tools/lib/bpf/libbpf_interna= l.h index de498e2dd6b0..19770402807f 100644 --- a/tools/lib/bpf/libbpf_internal.h +++ b/tools/lib/bpf/libbpf_internal.h @@ -666,6 +666,15 @@ static inline int sys_dup3(int oldfd, int newfd, int f= lags) return syscall(__NR_dup3, oldfd, newfd, flags); } =20 +/* Some versions of Android don't provide memfd_create() in their libc + * implementation, so avoid complications and just go straight to Linux + * syscall. + */ +static inline int sys_memfd_create(const char *name, unsigned flags) +{ + return syscall(__NR_memfd_create, name, flags); +} + /* Point *fixed_fd* to the same file that *tmp_fd* points to. * Regardless of success, *tmp_fd* is closed. * Whatever *fixed_fd* pointed to is closed silently. diff --git a/tools/lib/bpf/linker.c b/tools/lib/bpf/linker.c index b52f71c59616..077af6f8bebb 100644 --- a/tools/lib/bpf/linker.c +++ b/tools/lib/bpf/linker.c @@ -573,7 +573,7 @@ int bpf_linker__add_buf(struct bpf_linker *linker, void= *buf, size_t buf_sz, =20 snprintf(filename, sizeof(filename), "mem:%p+%zu", buf, buf_sz); =20 - fd =3D memfd_create(filename, 0); + fd =3D sys_memfd_create(filename, 0); if (fd < 0) { ret =3D -errno; pr_warn("failed to create memfd '%s': %s\n", filename, errstr(ret)); --=20 2.49.0.472.ge94155a9ec-goog