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Groups > linux.kernel > #1618730
| From | Mimi Zohar <zohar@linux.vnet.ibm.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH 09/24] kexec_file: Disable at runtime if securelevel has been set |
| Date | 2017-04-07 14:40 +0200 |
| Message-ID | <ttBlf-746-3@gated-at.bofh.it> (permalink) |
| References | (2 earlier) <tsZzj-7hF-5@gated-at.bofh.it> <tsZJ0-7kG-7@gated-at.bofh.it> <ttsrD-1tz-1@gated-at.bofh.it> <ttwlz-40I-1@gated-at.bofh.it> <ttydI-5d4-19@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Fri, 2017-04-07 at 10:17 +0100, David Howells wrote:
> Mimi Zohar <zohar@linux.vnet.ibm.com> wrote:
>
> > > Okay, fair enough. I can stick in an OR with an IS_ENABLED on some IMA
> > > symbol. CONFIG_IMA_KEXEC maybe? And also require IMA be enabled?
> >
> > Not quite, since as Dave pointed out, IMA is policy driven. As a
> > policy is installed, we could set a flag.
>
> Does such a flag exist as yet?
Not exactly what is needed. There's a flag named ima_appraise, which
is used internally in IMA. A temporary flag is created, while
validating the rules.
if (default_appraise_rules[i].func == POLICY_CHECK)
temp_ima_appraise |= IMA_APPRAISE_POLICY;
if (!result && (entry->action == UNKNOWN))
result = -EINVAL;
else if (entry->func == MODULE_CHECK)
temp_ima_appraise |= IMA_APPRAISE_MODULES;
else if (entry->func == FIRMWARE_CHECK)
temp_ima_appraise |= IMA_APPRAISE_FIRMWARE;
else if (entry->func == POLICY_CHECK)
temp_ima_appraise |= IMA_APPRAISE_POLICY;
If the entire policy is valid, ima_update_policy_flag() sets the ima_appraise flag.
ima_appraise |= temp_ima_appraise;
From an IMA perspective, either a file hash or signature are valid,
but for this usage it must be a signature. So in addition to testing
entry->func, above, entry->flags would need to be tested as well to
detect if IMA_DIGSIG_REQUIRED is set.
Mimi
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[PATCH 00/24] Kernel lockdown David Howells <dhowells@redhat.com> - 2017-04-05 22:20 +0200
[PATCH 24/24] Lock down module params that specify hardware parameters (eg. ioport) David Howells <dhowells@redhat.com> - 2017-04-05 22:20 +0200
[PATCH 03/24] efi: Lock down the kernel if booted in secure boot mode David Howells <dhowells@redhat.com> - 2017-04-05 22:20 +0200
[PATCH 20/24] bpf: Restrict kernel image access functions when the kernel is locked down David Howells <dhowells@redhat.com> - 2017-04-05 22:20 +0200
Re: [PATCH 20/24] bpf: Restrict kernel image access functions when the kernel is locked down Alexei Starovoitov <alexei.starovoitov@gmail.com> - 2017-04-06 14:30 +0200
Re: [PATCH 20/24] bpf: Restrict kernel image access functions when the kernel is locked down Ard Biesheuvel <ard.biesheuvel@linaro.org> - 2017-04-06 14:50 +0200
[PATCH 12/24] PCI: Lock down BAR access when the kernel is locked down David Howells <dhowells@redhat.com> - 2017-04-05 22:20 +0200
[PATCH 15/24] asus-wmi: Restrict debugfs interface when the kernel is locked down David Howells <dhowells@redhat.com> - 2017-04-05 22:20 +0200
Re: [PATCH 15/24] asus-wmi: Restrict debugfs interface when the kernel is locked down Andy Shevchenko <andy.shevchenko@gmail.com> - 2017-04-07 12:30 +0200
Re: [PATCH 15/24] asus-wmi: Restrict debugfs interface when the kernel is locked down David Howells <dhowells@redhat.com> - 2017-04-07 15:00 +0200
Re: [PATCH 15/24] asus-wmi: Restrict debugfs interface when the kernel is locked down Andy Shevchenko <andy.shevchenko@gmail.com> - 2017-04-09 13:20 +0200
Re: [PATCH 15/24] asus-wmi: Restrict debugfs interface when the kernel is locked down David Howells <dhowells@redhat.com> - 2017-04-10 15:20 +0200
[PATCH 02/24] Add the ability to lock down access to the running kernel image David Howells <dhowells@redhat.com> - 2017-04-05 22:20 +0200
[PATCH 07/24] kexec: Disable at runtime if the kernel is locked down David Howells <dhowells@redhat.com> - 2017-04-05 22:20 +0200
Re: [PATCH 07/24] kexec: Disable at runtime if the kernel is locked down Dave Young <dyoung@redhat.com> - 2017-04-07 05:10 +0200
[PATCH 08/24] Copy secure_boot flag in boot params across kexec reboot David Howells <dhowells@redhat.com> - 2017-04-05 22:20 +0200
[PATCH 06/24] Add a sysrq option to exit secure boot mode David Howells <dhowells@redhat.com> - 2017-04-05 22:20 +0200
[PATCH 10/24] hibernate: Disable when the kernel is locked down David Howells <dhowells@redhat.com> - 2017-04-05 22:20 +0200
[PATCH 14/24] x86: Restrict MSR access when the kernel is locked down David Howells <dhowells@redhat.com> - 2017-04-05 22:30 +0200
[PATCH 04/24] Enforce module signatures if the kernel is locked down David Howells <dhowells@redhat.com> - 2017-04-05 22:30 +0200
[PATCH 11/24] uswsusp: Disable when the kernel is locked down David Howells <dhowells@redhat.com> - 2017-04-05 22:30 +0200
Re: [PATCH 11/24] uswsusp: Disable when the kernel is locked down "Rafael J. Wysocki" <rafael@kernel.org> - 2017-04-06 01:40 +0200
Re: [PATCH 11/24] uswsusp: Disable when the kernel is locked down Oliver Neukum <oneukum@suse.com> - 2017-04-06 08:50 +0200
Re: [PATCH 11/24] uswsusp: Disable when the kernel is locked down David Howells <dhowells@redhat.com> - 2017-04-06 11:30 +0200
Re: [PATCH 11/24] uswsusp: Disable when the kernel is locked down "Rafael J. Wysocki" <rafael@kernel.org> - 2017-04-06 22:20 +0200
Re: [PATCH 11/24] uswsusp: Disable when the kernel is locked down Jiri Kosina <jikos@kernel.org> - 2017-04-06 22:30 +0200
Re: [PATCH 11/24] uswsusp: Disable when the kernel is locked down poma <pomidorabelisima@gmail.com> - 2017-04-08 05:30 +0200
Re: [PATCH 11/24] uswsusp: Disable when the kernel is locked down "Rafael J. Wysocki" <rafael@kernel.org> - 2017-04-06 22:20 +0200
Re: [PATCH 11/24] uswsusp: Disable when the kernel is locked down David Howells <dhowells@redhat.com> - 2017-04-06 09:00 +0200
Re: [PATCH 11/24] uswsusp: Disable when the kernel is locked down "Rafael J. Wysocki" <rafael@kernel.org> - 2017-04-06 22:20 +0200
[PATCH 09/24] kexec_file: Disable at runtime if securelevel has been set David Howells <dhowells@redhat.com> - 2017-04-05 22:30 +0200
Re: [PATCH 09/24] kexec_file: Disable at runtime if securelevel has been set Dave Young <dyoung@redhat.com> - 2017-04-07 05:10 +0200
Re: [PATCH 09/24] kexec_file: Disable at runtime if securelevel has been set Mimi Zohar <zohar@linux.vnet.ibm.com> - 2017-04-07 05:50 +0200
Re: [PATCH 09/24] kexec_file: Disable at runtime if securelevel has been set Dave Young <dyoung@redhat.com> - 2017-04-07 08:20 +0200
Re: [PATCH 09/24] kexec_file: Disable at runtime if securelevel has been set David Howells <dhowells@redhat.com> - 2017-04-07 09:10 +0200
Re: [PATCH 09/24] kexec_file: Disable at runtime if securelevel has been set Dave Young <dyoung@redhat.com> - 2017-04-07 09:50 +0200
Re: [PATCH 09/24] kexec_file: Disable at runtime if securelevel has been set Mimi Zohar <zohar@linux.vnet.ibm.com> - 2017-04-07 10:30 +0200
Re: [PATCH 09/24] kexec_file: Disable at runtime if securelevel has been set Dave Young <dyoung@redhat.com> - 2017-04-07 10:50 +0200
Re: [PATCH 09/24] kexec_file: Disable at runtime if securelevel has been set Mimi Zohar <zohar@linux.vnet.ibm.com> - 2017-04-07 09:50 +0200
Re: [PATCH 09/24] kexec_file: Disable at runtime if securelevel has been set Dave Young <dyoung@redhat.com> - 2017-04-07 10:10 +0200
Re: [PATCH 09/24] kexec_file: Disable at runtime if securelevel has been set David Howells <dhowells@redhat.com> - 2017-04-07 09:20 +0200
Re: [PATCH 09/24] kexec_file: Disable at runtime if securelevel has been set Mimi Zohar <zohar@linux.vnet.ibm.com> - 2017-04-07 09:50 +0200
Re: [PATCH 09/24] kexec_file: Disable at runtime if securelevel has been set David Howells <dhowells@redhat.com> - 2017-04-07 11:20 +0200
Re: [PATCH 09/24] kexec_file: Disable at runtime if securelevel has been set Mimi Zohar <zohar@linux.vnet.ibm.com> - 2017-04-07 14:40 +0200
Re: [PATCH 09/24] kexec_file: Disable at runtime if securelevel has been set David Howells <dhowells@redhat.com> - 2017-04-10 15:30 +0200
Re: [PATCH 00/24] Kernel lockdown "Austin S. Hemmelgarn" <ahferroin7@gmail.com> - 2017-04-07 18:10 +0200
Re: [PATCH 00/24] Kernel lockdown Justin Forbes <jmforbes@linuxtx.org> - 2017-04-07 18:40 +0200
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