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Message-ID: <d95c6e8e3d6c589fb6af57dc0cb7e5c84659e295.camel@kernel.org>
Subject: Re: [PATCH v3 5/6] tpm: Add tpm_buf_read_{u8,u16,u32}
From:   Jarkko Sakkinen <jarkko@kernel.org>
To:     James Bottomley <James.Bottomley@HansenPartnership.com>,
        linux-integrity@vger.kernel.org
Cc:     keyrings@vger.kernel.org,
        William Roberts <bill.c.roberts@gmail.com>,
        Stefan Berger <stefanb@linux.ibm.com>,
        David Howells <dhowells@redhat.com>,
        Jason Gunthorpe <jgg@ziepe.ca>,
        Mimi Zohar <zohar@linux.ibm.com>,
        Peter Huewe <peterhuewe@gmx.de>,
        Mario Limonciello <mario.limonciello@amd.com>,
        Julien Gomes <julien@arista.com>,
        Jerry Snitselaar <jsnitsel@redhat.com>,
        open list <linux-kernel@vger.kernel.org>
Date:   Mon, 06 Nov 2023 05:22:26 +0200
In-Reply-To: <6c733fad84445bd29df230ecb5310535bfef2254.camel@HansenPartnership.com>
References: <20231024011531.442587-1-jarkko@kernel.org>
         <20231024011531.442587-6-jarkko@kernel.org>
         <6c733fad84445bd29df230ecb5310535bfef2254.camel@HansenPartnership.com>
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On Fri, 2023-10-27 at 08:24 -0400, James Bottomley wrote:
> On Tue, 2023-10-24 at 04:15 +0300, Jarkko Sakkinen wrote:
> > +++ b/drivers/char/tpm/tpm-buf.c
> > @@ -124,3 +124,72 @@ void tpm_buf_append_u32(struct tpm_buf *buf,
> > const u32 value)
> > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0tpm_buf_append(buf, (u8=
 *)&value2, 4);
> > =C2=A0}
> > =C2=A0EXPORT_SYMBOL_GPL(tpm_buf_append_u32);
> > +
> > +/**
> > + * tpm_buf_read() - Read from a TPM buffer
> > + * @buf:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0&tpm_buf instance
> > + * @offset:=C2=A0=C2=A0=C2=A0=C2=A0offset within the buffer
> > + * @count:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0the number of bytes to read
> > + * @output:=C2=A0=C2=A0=C2=A0=C2=A0the output buffer
> > + */
> > +static void tpm_buf_read(const struct tpm_buf *buf, off_t *offset,
> > size_t count, void *output)
> > +{
> > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0if (*(offset + count) >=3D b=
uf->length) {
>=20
> I don't think you mean that; it's dereferencing a random location in
> the stack, which is why I see this check trip randomly when testing.=C2=
=A0 I
> think you mean
>=20
> if (*offset + count >=3D buf->length) {
>=20
> James

Yes, true! Thank you.

BR, Jarkko