From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from m16.mail.163.com (m16.mail.163.com [117.135.210.2]) (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 535B13B6348; Sat, 11 Apr 2026 16:37:08 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=117.135.210.2 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775925434; cv=none; b=J+/BCGhjZ0XmEM7Hwz9GMKwyl5uJ0wae9NAleogE/OCP+9dBFioonrNEv50MgWG0vU6adbKBkA9TmQV9jXLxkl53seSA0ZWYpSJP0nyjRMTZysn0FB8eHBs7Cw5JyHf5f3fMoCHAc1JtK6OSicDdNfl38yJN/Ff5I6HgOt3aAOE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775925434; c=relaxed/simple; bh=iEYTN/i0ensRxHCR3PWp+UZvvmrgLHYp6XBloHadzyM=; h=From:To:Cc:Subject:Date:Message-Id; b=FXyLSLoCBNR7SqHg6E6K1bWJ9vo6/m9/FK3yeJ/mayNmqLlXWeL8TVXRDrowtAhHoe84RXhGE/x1moVqYM4mpm8x5reLSuPvDpgvIE1GD+XMI7JmKZMDKWxUJBWh9dRIJUrEiBRLj477BP3CG3MJJtgqGSExTJAg6xSFF23bSbg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=163.com; spf=pass smtp.mailfrom=163.com; dkim=pass (1024-bit key) header.d=163.com header.i=@163.com header.b=i95X4gy1; arc=none smtp.client-ip=117.135.210.2 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=163.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=163.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=163.com header.i=@163.com header.b="i95X4gy1" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=163.com; s=s110527; h=From:To:Subject:Date:Message-Id; bh=avNQzUN3cbjiD4n aA3fIjqUVtalOyi0zej3JABA4QTE=; b=i95X4gy1hl7F9820go7RdYE/qbcg23/ uNVSJcO6nHrV/k9DitCE/ESb3iAs1ihza1g1Sa/TQiPy3eX8Mn8iEkZtcli1BSGK ErwXwCKzHiJioriEj6FTDOPKkmsINqfUYDcY6UMagaBBXmKm8lhnKlw7c4zhiDg0 HKj8PUObvfok= Received: from yang-Virtual-Machine.mshome.net (unknown []) by gzga-smtp-mtada-g1-3 (Coremail) with SMTP id _____wAn3n9ueNppX_iUEg--.31671S2; Sun, 12 Apr 2026 00:35:59 +0800 (CST) From: Feng Yang To: ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, martin.lau@linux.dev, eddyz87@gmail.com, memxor@gmail.com, song@kernel.org, yonghong.song@linux.dev, jolsa@kernel.org, john.fastabend@gmail.com, kpsingh@kernel.org, mattbobrowski@google.com, jiayuan.chen@linux.dev, leon.hwang@linux.dev, menglong.dong@linux.dev Cc: bpf@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, Feng Yang Subject: [PATCH v3 bpf-next 0/2] bpf: Fix Null-Pointer Dereference in kernel_clone() via BPF fmod_ret on security_task_alloc Date: Sun, 12 Apr 2026 00:35:54 +0800 Message-Id: <20260411163556.8567-1-yangfeng59949@163.com> X-Mailer: git-send-email 2.17.1 X-CM-TRANSID:_____wAn3n9ueNppX_iUEg--.31671S2 X-Coremail-Antispam: 1Uf129KBjvdXoWrKrWDZry5KFWftw4fKr4fAFb_yoWkZrc_ur 4Fq34rtrZ7tFn8CayakF47GrZ0yayfGr4fAasxta43XrnrXr1UKF4vqr95JFy8W3WfGrWa yF98Cas5trnF9jkaLaAFLSUrUUUUjb8apTn2vfkv8UJUUUU8Yxn0WfASr-VFAUDa7-sFnT 9fnUUvcSsGvfC2KfnxnUUI43ZEXa7IU8v_M3UUUUU== X-CM-SenderInfo: p1dqww5hqjkmqzuzqiywtou0bp/xtbC8g9KwmnaeG-w3QAA38 Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: From: Feng Yang This patch set adds return value validation for fmod_ret to prevent system crashes caused by incorrect return values. Changes in v3: - Do not move the code, and make some formatting changes. Thanks, Leon Hwang. - Error injection always ensures that 0 is a valid return value. Thanks, Menglong Dong. - Link to v2: https://lore.kernel.org/all/20260410061037.149532-1-yangfeng59949@163.com/ Changes in v2: - Add validation for fault injection and include selftests. Thanks, Jiri Olsa, Jiayuan Chen. - Link to v1: https://lore.kernel.org/all/20260408094816.228322-1-yangfeng59949@163.com/ Feng Yang (2): bpf: Fix Null-Pointer Dereference in kernel_clone() via BPF fmod_ret on security_task_alloc selftests/bpf: Add selftests for verifying return values of fmod_ret. kernel/bpf/verifier.c | 114 +++++++++++++++++- .../selftests/bpf/prog_tests/verifier.c | 2 + .../bpf/progs/verifier_fmod_ret_return.c | 59 +++++++++ 3 files changed, 173 insertions(+), 2 deletions(-) create mode 100644 tools/testing/selftests/bpf/progs/verifier_fmod_ret_return.c -- 2.43.0