From: Mathieu Poirier <mathieu.poirier@linaro.org>
To: Bjorn Andersson <bjorn.andersson@linaro.org>
Cc: Andy Gross <agross@kernel.org>, Ohad Ben-Cohen <ohad@wizery.com>,
Sibi Sankar <sibis@codeaurora.org>,
Siddharth Gupta <sidgup@codeaurora.org>,
linux-arm-msm@vger.kernel.org, linux-remoteproc@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2] remoteproc: qcom_q6v5_mss: Validate p_filesz in ELF loader
Date: Mon, 15 Mar 2021 11:06:23 -0600 [thread overview]
Message-ID: <20210315170623.GD1339147@xps15> (raw)
In-Reply-To: <20210312232002.3466791-1-bjorn.andersson@linaro.org>
On Fri, Mar 12, 2021 at 03:20:02PM -0800, Bjorn Andersson wrote:
> Analog to the issue in the common mdt_loader code the MSS ELF loader
> does not validate that p_filesz bytes will fit in the memory region and
> that the loaded segments are not truncated. Fix this in the same way
> as proposed for the mdt_loader.
>
> Fixes: 135b9e8d1cd8 ("remoteproc: qcom_q6v5_mss: Validate modem blob firmware size before load")
> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
> ---
>
> Changes since v1:
> - Don't just break the loop, goto release_firmware.
> - Release seg_fw as well.
>
> drivers/remoteproc/qcom_q6v5_mss.c | 18 ++++++++++++++++++
> 1 file changed, 18 insertions(+)
>
> diff --git a/drivers/remoteproc/qcom_q6v5_mss.c b/drivers/remoteproc/qcom_q6v5_mss.c
> index 66106ba25ba3..14e0ce5f18f5 100644
> --- a/drivers/remoteproc/qcom_q6v5_mss.c
> +++ b/drivers/remoteproc/qcom_q6v5_mss.c
> @@ -1210,6 +1210,14 @@ static int q6v5_mpss_load(struct q6v5 *qproc)
> goto release_firmware;
> }
>
> + if (phdr->p_filesz > phdr->p_memsz) {
> + dev_err(qproc->dev,
> + "refusing to load segment %d with p_filesz > p_memsz\n",
> + i);
> + ret = -EINVAL;
> + goto release_firmware;
> + }
> +
> ptr = memremap(qproc->mpss_phys + offset, phdr->p_memsz, MEMREMAP_WC);
> if (!ptr) {
> dev_err(qproc->dev,
> @@ -1241,6 +1249,16 @@ static int q6v5_mpss_load(struct q6v5 *qproc)
> goto release_firmware;
> }
>
> + if (seg_fw->size != phdr->p_filesz) {
> + dev_err(qproc->dev,
> + "failed to load segment %d from truncated file %s\n",
> + i, fw_name);
> + ret = -EINVAL;
> + release_firmware(seg_fw);
> + memunmap(ptr);
> + goto release_firmware;
> + }
> +
Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
> release_firmware(seg_fw);
> }
>
> --
> 2.29.2
>
next prev parent reply other threads:[~2021-03-15 17:07 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-12 23:20 [PATCH v2] remoteproc: qcom_q6v5_mss: Validate p_filesz in ELF loader Bjorn Andersson
2021-03-15 17:06 ` Mathieu Poirier [this message]
2021-05-26 19:03 ` patchwork-bot+linux-arm-msm
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