Re: [PATCH 3/3] x86/ima: retry detecting secure boot mode

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To: Mimi Zohar <zohar@xxxxxxxxxxxxx>
Subject: Re: [PATCH 3/3] x86/ima: retry detecting secure boot mode
From: Matthew Garrett <mjg59@xxxxxxxxxx>
Date: Fri, 8 Mar 2019 12:22:46 -0800
Cc: Justin Forbes <jforbes@xxxxxxxxxx>, linux-integrity <linux-integrity@xxxxxxxxxxxxxxx>, LSM List <linux-security-module@xxxxxxxxxxxxxxx>, linux-efi <linux-efi@xxxxxxxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, David Howells <dhowells@xxxxxxxxxx>, Seth Forshee <seth.forshee@xxxxxxxxxxxxx>, kexec@xxxxxxxxxxxxxxxxxxx, Nayna Jain <nayna@xxxxxxxxxxxxx>
In-reply-to: <1552070598.4134.51.camel@linux.ibm.com>
References: <1542657371-7019-1-git-send-email-zohar@linux.ibm.com> <1542657371-7019-4-git-send-email-zohar@linux.ibm.com> <CACdnJusqHZ1OLJD1baN=fXK9KE+bSqzB4OUbmLXH5-qZNrQXJg@mail.gmail.com> <CAFbkSA39RwB+E4SaG_ueu-_B=y7JytEYKw1+eXNQ_eCuMfnv=g@mail.gmail.com> <CACdnJuuHmK0qKjMxxonRYDUCatxqs930QGNQmREhRjimpNKzYw@mail.gmail.com> <1551998897.31706.461.camel@linux.ibm.com> <CACdnJusiLSCyqx7NX5bkpFr2N5YjBt_h3miOgkbey-Zndc3+Kg@mail.gmail.com> <1552052377.4134.23.camel@linux.ibm.com> <CACdnJut3Y7CogvgtNsEcrEtA1WOxSb9OWP_wZ=3xNgCft2oeDw@mail.gmail.com> <1552070598.4134.51.camel@linux.ibm.com>

On Fri, Mar 8, 2019 at 10:43 AM Mimi Zohar <zohar@xxxxxxxxxxxxx> wrote:
> FYI, efi_printk() works before exit_boot(), but not afterwards.  The
> system hangs.

efi_printk() uses boot services to print, so that's not unexpected :)
It would probably be sensible to return an error rather than crash,
though…

References:
- [PATCH 0/3] selftest/ima: fail kexec_load syscall
  - From: Mimi Zohar
- [PATCH 3/3] x86/ima: retry detecting secure boot mode
  - From: Mimi Zohar
- Re: [PATCH 3/3] x86/ima: retry detecting secure boot mode
  - From: Matthew Garrett
- Re: [PATCH 3/3] x86/ima: retry detecting secure boot mode
  - From: Matthew Garrett
- Re: [PATCH 3/3] x86/ima: retry detecting secure boot mode
  - From: Mimi Zohar
- Re: [PATCH 3/3] x86/ima: retry detecting secure boot mode
  - From: Matthew Garrett
- Re: [PATCH 3/3] x86/ima: retry detecting secure boot mode
  - From: Mimi Zohar
- Re: [PATCH 3/3] x86/ima: retry detecting secure boot mode
  - From: Matthew Garrett
- Re: [PATCH 3/3] x86/ima: retry detecting secure boot mode
  - From: Mimi Zohar

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