On Wed 13 Jan 15:22 CST 2021, Mathieu Poirier wrote:
> Hi Bjorn,
>
> On Thu, Jan 07, 2021 at 03:50:53PM -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@xxxxxxxxxx>
> > ---
> > drivers/remoteproc/qcom_q6v5_mss.c | 17 +++++++++++++++++
> > 1 file changed, 17 insertions(+)
> >
> > diff --git a/drivers/remoteproc/qcom_q6v5_mss.c b/drivers/remoteproc/qcom_q6v5_mss.c
> > index 66106ba25ba3..2b59e0cbdce1 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;
> > + break;
>
> Based on the error handling for the above and below conditions, I would have
> expected a "goto release_firmware" rather than a "break".
>
You're certainly right!
Yet another reason for the duplication between this function, the
mdt_loader and the remoteproc_elf_loader is a bad idea - still not sure
how to refactor any one of them to fit the three.
Thank you,
Bjorn
> > + }
> > +
> > ptr = memremap(qproc->mpss_phys + offset, phdr->p_memsz, MEMREMAP_WC);
> > if (!ptr) {
> > dev_err(qproc->dev,
> > @@ -1241,6 +1249,15 @@ 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;
> > + memunmap(ptr);
> > + break;
>
> Same here.
>
> > + }
> > +
> > release_firmware(seg_fw);
> > }
>
> Thanks,
> Mathieu
>
> >
> > --
> > 2.29.2
> >
