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Groups > linux.kernel > #1650953
| From | Jason Gunthorpe <jgunthorpe@obsidianresearch.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH RFC] tpm: migrate pubek_show to struct tpm_buf |
| Date | 2017-05-26 00:50 +0200 |
| Message-ID | <tL9JT-5SC-1@gated-at.bofh.it> (permalink) |
| References | <tL8kN-51l-3@gated-at.bofh.it> <tL8kN-51l-1@gated-at.bofh.it> <tL9qy-5KR-21@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Thu, May 25, 2017 at 03:28:01PM -0700, Jarkko Sakkinen wrote: > On Thu, May 25, 2017 at 03:16:13PM -0600, Jason Gunthorpe wrote: > > On Thu, May 25, 2017 at 02:11:04PM -0700, Jarkko Sakkinen wrote: > > > struct tpm_chip *chip = to_tpm_chip(dev); > > > + char anti_replay[20]; > > > > > > - tpm_cmd.header.in = tpm_readpubek_header; > > > - err = tpm_transmit_cmd(chip, NULL, &tpm_cmd, READ_PUBEK_RESULT_SIZE, > > > + rc = tpm_buf_init(&tpm_buf, TPM_TAG_RQU_COMMAND, TPM_ORD_READPUBEK); > > > + if (rc) > > > + return rc; > > > + > > > + /* The checksum is ignored so it doesn't matter what the contents are. > > > + */ > > > + tpm_buf_append(&tpm_buf, anti_replay, sizeof(anti_replay)); > > > > It does matter, we do not want to leak random kernel memory incase it > > has something sensitive. Zero anti_replay. > > If there was a leak it has existed before this change as tpm_cmd was > also allocated from stack. And there is not leak because the checksum is > not printed. It leaks stack memory to the TPM which is not OK. > I think better idea would be to move struct tpm_readpubek_params_out > declaration here and use it to refer different fields. Previously > this That would be better.. Jason
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Re: [PATCH RFC] tpm: migrate pubek_show to struct tpm_buf Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2017-05-25 23:20 +0200
Re: [PATCH RFC] tpm: migrate pubek_show to struct tpm_buf Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> - 2017-05-26 00:30 +0200
Re: [PATCH RFC] tpm: migrate pubek_show to struct tpm_buf Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2017-05-26 00:50 +0200
Re: [PATCH RFC] tpm: migrate pubek_show to struct tpm_buf Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> - 2017-05-30 07:00 +0200
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