From patchwork Tue Nov 12 05:20:35 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Suraj Sonawane X-Patchwork-Id: 13871731 Received: from mail-pl1-f181.google.com (mail-pl1-f181.google.com [209.85.214.181]) (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 9A78A1B86E4; Tue, 12 Nov 2024 05:20:46 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.181 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731388848; cv=none; b=qr00q4jdJEvSaIwvW9ouCrhFrkWxRoaYnAYFD4FxRxvhDSe8zHuY9QGYeZQm8LC85fTsJO32irZufSwihhTzstPoRdLefSt6H3rrem65NdOTFD9c9rTPL6NwdX9ahnFEbLFtBGv7+7NeOcAlrfrqfPh1Si+pfJ/LxDLVSTy1db4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731388848; c=relaxed/simple; bh=xYGzH9hAlrxBlbHGfPc0XgIXYM4XAfbRpAuBzkRUnz4=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=P73RQnMjneWN+HZVJ5q+sPNkkn2fd/z82ysT3s4GhcUTKHy0CnJ+hTm7++86B8M6Z152G9lwLo6tQvJSr70TUelgJyvCUNqO9TQlew/sJyvA/rul/vNg4qJlAq5ZiAIhV6VQz4tI8x/OFtN8XJmWXwCesnNg6e6C++ikTCgqBmM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=la/JXcHf; arc=none smtp.client-ip=209.85.214.181 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="la/JXcHf" Received: by mail-pl1-f181.google.com with SMTP id d9443c01a7336-210e5369b7dso53552095ad.3; Mon, 11 Nov 2024 21:20:46 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1731388846; x=1731993646; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=Nraq509unMAALzeVagoiRPKJbfQ4zWQzvCgRLQ6O0iE=; b=la/JXcHfSU6exQdaRAGdp++fG8U/GiPbm6tI3WjOzCQCyeXVqxFwTNLopGky7jMamc 0VULtJIs3vQ1VXneeyrhx5TyMHeAGGtHnjZeRG8SKDQBCFLQZ32ci1KZ0WyHkOKUy5T0 ozcfDZJlUTteLpNNU5QRA6fiCLfkQe7Fux/ZsT0BNvwvdMJVgRS28i3jsQu5mF21yGk9 WFelAzuhg05WQUlPKbhTPzJpykanfbPXFdXXal+tjEKretI6HRzph97+8EIUkoscduBv 1TuMy1KP7gLPotwqA3Qlpr04+Kdwru/GTGI4YAaW+usXnBYtw80cncQtflYPcyFDtMe7 1Ddw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1731388846; x=1731993646; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=Nraq509unMAALzeVagoiRPKJbfQ4zWQzvCgRLQ6O0iE=; b=DbBy61jq/LLhCP8uIhObfqTnrWPXwyvbxUcyG/5teenvGY0xxyTv0BkLYHJ8HyOmnp qeJn0o23GoEPCDs8208MiLRcGh5rMbAgWFSoBw3AgoFMOsDusr3IfobEQ0xOVC9MLDOi ZsKTNif65FwbHFjMtzmfqZFusFtWo532ny0FvSdSpdAgrcWybvioPl/OiR72rqvkKRPv Z/adNXXVpKEqZbuaa6TYpzjxwm2tHVENE7foLmDM3TCXnWY84ZIsxUOUSVdLM2DgzSzo 9P2r+d1KWSx19rxLYPAbYgWIgjreQhNxUa4jbq5nGlRoecE1GXb96ZQjF10B+Nyh532O KkTA== X-Forwarded-Encrypted: i=1; AJvYcCV8D6xKUiQWPWVLh/FA2uzpLk4+VLsuzrkV+3OnsXEd7IRKH/pkYPMPrQLoPpOY6GGMoCX5u43G1aTQ6IUU@vger.kernel.org, AJvYcCXOnw/aNj+QtkS0ybAN78mJ1D37EvNLqsAco4D+r3Hk/R/lZqftzLc//bHQq92VKBTcH/NY8XOBkAa3@vger.kernel.org X-Gm-Message-State: AOJu0Yx15wDRHUOF3QppzQO+yAB+VgHAxmJxS7BBrZeJP9k9uzHftb+f UWD2c3KSbeqm2yPvJ6214brardyLl/RGglenSqi5xa9eWajz1RtR X-Google-Smtp-Source: AGHT+IEqt1K+FlBqj/5RBYdoY6r0noCkeefboU76QtLTtaAGk+R/+2di6v4C395v6POpzeSOxjuQAQ== X-Received: by 2002:a17:902:d4cc:b0:211:898:7cde with SMTP id d9443c01a7336-21183d23fe0mr185099865ad.31.1731388845729; Mon, 11 Nov 2024 21:20:45 -0800 (PST) Received: from purva-IdeaPad-Gaming-3-15IHU6.. ([2405:204:20ac:21b:f63:7054:e444:2bb5]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-211af0d6f9csm1173445ad.58.2024.11.11.21.20.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 11 Nov 2024 21:20:45 -0800 (PST) From: Suraj Sonawane To: dan.j.williams@intel.com Cc: vishal.l.verma@intel.com, dave.jiang@intel.com, ira.weiny@intel.com, rafael@kernel.org, lenb@kernel.org, nvdimm@lists.linux.dev, linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, Suraj Sonawane , syzbot+7534f060ebda6b8b51b3@syzkaller.appspotmail.com Subject: [PATCH v2] acpi: nfit: vmalloc-out-of-bounds Read in acpi_nfit_ctl Date: Tue, 12 Nov 2024 10:50:35 +0530 Message-Id: <20241112052035.14122-1-surajsonawane0215@gmail.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Fix an issue detected by syzbot with KASAN: BUG: KASAN: vmalloc-out-of-bounds in cmd_to_func drivers/acpi/nfit/ core.c:416 [inline] BUG: KASAN: vmalloc-out-of-bounds in acpi_nfit_ctl+0x20e8/0x24a0 drivers/acpi/nfit/core.c:459 The issue occurs in `cmd_to_func` when the `call_pkg->nd_reserved2` array is accessed without verifying that `call_pkg` points to a buffer that is sized appropriately as a `struct nd_cmd_pkg`. This could lead to out-of-bounds access and undefined behavior if the buffer does not have sufficient space. To address this issue, a check was added in `acpi_nfit_ctl()` to ensure that `buf` is not `NULL` and `buf_len` is greater than or equal to `sizeof(struct nd_cmd_pkg)` before casting `buf` to `struct nd_cmd_pkg *`. This ensures safe access to the members of `call_pkg`, including the `nd_reserved2` array. This change preventing out-of-bounds reads. Reported-by: syzbot+7534f060ebda6b8b51b3@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=7534f060ebda6b8b51b3 Tested-by: syzbot+7534f060ebda6b8b51b3@syzkaller.appspotmail.com Fixes: 2d5404caa8c7 ("Linux 6.12-rc7") Signed-off-by: Suraj Sonawane --- V1: https://lore.kernel.org/lkml/20241111080429.9861-1-surajsonawane0215@gmail.com/ V2: Initialized `out_obj` to `NULL` in `acpi_nfit_ctl()` to prevent potential uninitialized variable usage if condition is true. drivers/acpi/nfit/core.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c index 5429ec9ef..d0e655a9c 100644 --- a/drivers/acpi/nfit/core.c +++ b/drivers/acpi/nfit/core.c @@ -439,7 +439,7 @@ int acpi_nfit_ctl(struct nvdimm_bus_descriptor *nd_desc, struct nvdimm *nvdimm, { struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc); struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm); - union acpi_object in_obj, in_buf, *out_obj; + union acpi_object in_obj, in_buf, *out_obj = NULL; const struct nd_cmd_desc *desc = NULL; struct device *dev = acpi_desc->dev; struct nd_cmd_pkg *call_pkg = NULL; @@ -454,8 +454,14 @@ int acpi_nfit_ctl(struct nvdimm_bus_descriptor *nd_desc, struct nvdimm *nvdimm, if (cmd_rc) *cmd_rc = -EINVAL; - if (cmd == ND_CMD_CALL) - call_pkg = buf; + if (cmd == ND_CMD_CALL) { + if (buf == NULL || buf_len < sizeof(struct nd_cmd_pkg)) { + rc = -EINVAL; + goto out; + } + call_pkg = (struct nd_cmd_pkg *)buf; + } + func = cmd_to_func(nfit_mem, cmd, call_pkg, &family); if (func < 0) return func;