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From: Mimi Zohar <zohar@linux.vnet.ibm.com>
To: David Howells <dhowells@redhat.com>
Cc: Dave Young <dyoung@redhat.com>,
	linux-kernel@vger.kernel.org,
	Matthew Garrett <mjg59@srcf.ucam.org>,
	linux-efi@vger.kernel.org, gnomes@lxorguk.ukuu.org.uk,
	Chun-Yi Lee <jlee@suse.com>,
	gregkh@linuxfoundation.org, kexec@lists.infradead.org,
	linux-security-module@vger.kernel.org, keyrings@vger.kernel.org,
	matthew.garrett@nebula.com
Subject: Re: [PATCH 09/24] kexec_file: Disable at runtime if securelevel has been set
Date: Fri, 07 Apr 2017 03:46:20 -0400	[thread overview]
Message-ID: <1491551180.4184.50.camel@linux.vnet.ibm.com> (raw)
In-Reply-To: <21572.1491548994@warthog.procyon.org.uk>

On Fri, 2017-04-07 at 08:09 +0100, David Howells wrote:
> Mimi Zohar <zohar@linux.vnet.ibm.com> wrote:
> 
> > > > +	if (!IS_ENABLED(CONFIG_KEXEC_VERIFY_SIG) && kernel_is_locked_down())
> > > > +		return -EPERM;
> > > > +
> > > >  
> > 
> > IMA can be used to verify file signatures too, based on the LSM hooks
> > in  kernel_read_file_from_fd().  CONFIG_KEXEC_VERIFY_SIG should not be
> > required.
> 
> 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.

Mimi

WARNING: multiple messages have this Message-ID (diff)
From: zohar@linux.vnet.ibm.com (Mimi Zohar)
To: linux-security-module@vger.kernel.org
Subject: [PATCH 09/24] kexec_file: Disable at runtime if securelevel has been set
Date: Fri, 07 Apr 2017 03:46:20 -0400	[thread overview]
Message-ID: <1491551180.4184.50.camel@linux.vnet.ibm.com> (raw)
In-Reply-To: <21572.1491548994@warthog.procyon.org.uk>

On Fri, 2017-04-07 at 08:09 +0100, David Howells wrote:
> Mimi Zohar <zohar@linux.vnet.ibm.com> wrote:
> 
> > > > +	if (!IS_ENABLED(CONFIG_KEXEC_VERIFY_SIG) && kernel_is_locked_down())
> > > > +		return -EPERM;
> > > > +
> > > >  
> > 
> > IMA can be used to verify file signatures too, based on the LSM hooks
> > in ?kernel_read_file_from_fd(). ?CONFIG_KEXEC_VERIFY_SIG should not be
> > required.
> 
> 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.

Mimi

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WARNING: multiple messages have this Message-ID (diff)
From: Mimi Zohar <zohar@linux.vnet.ibm.com>
To: David Howells <dhowells@redhat.com>
Cc: Matthew Garrett <mjg59@srcf.ucam.org>,
	linux-efi@vger.kernel.org, gnomes@lxorguk.ukuu.org.uk,
	gregkh@linuxfoundation.org, kexec@lists.infradead.org,
	linux-kernel@vger.kernel.org, Chun-Yi Lee <jlee@suse.com>,
	linux-security-module@vger.kernel.org, keyrings@vger.kernel.org,
	matthew.garrett@nebula.com, Dave Young <dyoung@redhat.com>
Subject: Re: [PATCH 09/24] kexec_file: Disable at runtime if securelevel has been set
Date: Fri, 07 Apr 2017 03:46:20 -0400	[thread overview]
Message-ID: <1491551180.4184.50.camel@linux.vnet.ibm.com> (raw)
In-Reply-To: <21572.1491548994@warthog.procyon.org.uk>

On Fri, 2017-04-07 at 08:09 +0100, David Howells wrote:
> Mimi Zohar <zohar@linux.vnet.ibm.com> wrote:
> 
> > > > +	if (!IS_ENABLED(CONFIG_KEXEC_VERIFY_SIG) && kernel_is_locked_down())
> > > > +		return -EPERM;
> > > > +
> > > >  
> > 
> > IMA can be used to verify file signatures too, based on the LSM hooks
> > in  kernel_read_file_from_fd().  CONFIG_KEXEC_VERIFY_SIG should not be
> > required.
> 
> 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.

Mimi


_______________________________________________
kexec mailing list
kexec@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/kexec

  reply	other threads:[~2017-04-07  7:46 UTC|newest]

Thread overview: 213+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-04-05 20:14 [PATCH 00/24] Kernel lockdown David Howells
2017-04-05 20:14 ` David Howells
2017-04-05 20:14 ` [PATCH 01/24] efi: Add EFI_SECURE_BOOT bit David Howells
2017-04-05 20:14   ` David Howells
2017-04-06  8:26   ` Ard Biesheuvel
2017-04-06  8:26     ` Ard Biesheuvel
2017-04-06  8:48   ` David Howells
2017-04-06  8:48     ` David Howells
2017-04-05 20:14 ` [PATCH 02/24] Add the ability to lock down access to the running kernel image David Howells
2017-04-05 20:14   ` David Howells
2017-04-05 20:14   ` David Howells
2017-04-05 20:14 ` [PATCH 03/24] efi: Lock down the kernel if booted in secure boot mode David Howells
2017-04-05 20:14   ` David Howells
2017-04-05 20:15 ` [PATCH 04/24] Enforce module signatures if the kernel is locked down David Howells
2017-04-05 20:15   ` David Howells
2017-04-05 20:15 ` [PATCH 05/24] Restrict /dev/mem and /dev/kmem when " David Howells
2017-04-05 20:15   ` David Howells
2017-04-05 20:15 ` [PATCH 06/24] Add a sysrq option to exit secure boot mode David Howells
2017-04-05 20:15   ` David Howells
2017-04-14 18:05   ` Thomas Gleixner
2017-04-14 18:05     ` Thomas Gleixner
2017-04-14 18:05     ` Thomas Gleixner
2017-04-14 18:15     ` Ard Biesheuvel
2017-04-14 18:15       ` Ard Biesheuvel
2017-04-14 18:15       ` Ard Biesheuvel
2017-04-14 23:16     ` David Howells
2017-04-14 23:16       ` David Howells
2017-04-14 23:16       ` David Howells
2017-04-16 20:46     ` Matt Fleming
2017-04-16 20:46       ` Matt Fleming
2017-04-16 20:46       ` Matt Fleming
2017-04-05 20:15 ` [PATCH 07/24] kexec: Disable at runtime if the kernel is locked down David Howells
2017-04-05 20:15   ` David Howells
2017-04-05 20:15   ` David Howells
2017-04-07  3:07   ` Dave Young
2017-04-07  3:07     ` Dave Young
2017-04-07  3:07     ` Dave Young
2017-04-07  3:07     ` Dave Young
2017-04-05 20:15 ` [PATCH 08/24] Copy secure_boot flag in boot params across kexec reboot David Howells
2017-04-05 20:15   ` David Howells
2017-04-05 20:15   ` David Howells
2017-04-05 20:15 ` [PATCH 09/24] kexec_file: Disable at runtime if securelevel has been set David Howells
2017-04-05 20:15   ` David Howells
2017-04-05 20:15   ` David Howells
2017-04-05 20:15   ` David Howells
2017-04-07  3:05   ` Dave Young
2017-04-07  3:05     ` Dave Young
2017-04-07  3:05     ` Dave Young
2017-04-07  3:05     ` Dave Young
2017-04-07  3:49     ` Mimi Zohar
2017-04-07  3:49       ` Mimi Zohar
2017-04-07  3:49       ` Mimi Zohar
2017-04-07  6:19       ` Dave Young
2017-04-07  6:19         ` Dave Young
2017-04-07  6:19         ` Dave Young
2017-04-07  6:19         ` Dave Young
2017-04-07  7:45         ` Mimi Zohar
2017-04-07  7:45           ` Mimi Zohar
2017-04-07  7:45           ` Mimi Zohar
2017-04-07  8:01           ` Dave Young
2017-04-07  8:01             ` Dave Young
2017-04-07  8:01             ` Dave Young
2017-04-07  7:07       ` David Howells
2017-04-07  7:07         ` David Howells
2017-04-07  7:07         ` David Howells
2017-04-07  7:41         ` Dave Young
2017-04-07  7:41           ` Dave Young
2017-04-07  7:41           ` Dave Young
2017-04-07  7:41           ` Dave Young
2017-04-07  8:28           ` Mimi Zohar
2017-04-07  8:28             ` Mimi Zohar
2017-04-07  8:28             ` Mimi Zohar
2017-04-07  8:28             ` Mimi Zohar
2017-04-07  8:42             ` Dave Young
2017-04-07  8:42               ` Dave Young
2017-04-07  8:42               ` Dave Young
2017-04-07  8:42               ` Dave Young
2017-04-07  7:09     ` David Howells
2017-04-07  7:09       ` David Howells
2017-04-07  7:09       ` David Howells
2017-04-07  7:46       ` Mimi Zohar [this message]
2017-04-07  7:46         ` Mimi Zohar
2017-04-07  7:46         ` Mimi Zohar
2017-04-07  9:17       ` David Howells
2017-04-07  9:17         ` David Howells
2017-04-07  9:17         ` David Howells
2017-04-07 12:36         ` Mimi Zohar
2017-04-07 12:36           ` Mimi Zohar
2017-04-07 12:36           ` Mimi Zohar
2017-04-10 13:19         ` David Howells
2017-04-10 13:19           ` David Howells
2017-04-10 13:19           ` David Howells
2017-05-02 19:01           ` Mimi Zohar
2017-05-02 19:01             ` Mimi Zohar
2017-05-02 19:01             ` Mimi Zohar
2017-05-02 19:01             ` Mimi Zohar
2017-04-05 20:16 ` [PATCH 10/24] hibernate: Disable when the kernel is locked down David Howells
2017-04-05 20:16   ` David Howells
2017-04-05 20:16 ` [PATCH 11/24] uswsusp: " David Howells
2017-04-05 20:16   ` David Howells
2017-04-05 23:38   ` Rafael J. Wysocki
2017-04-05 23:38     ` Rafael J. Wysocki
2017-04-05 23:38     ` Rafael J. Wysocki
2017-04-06  6:39     ` Oliver Neukum
2017-04-06  6:39       ` Oliver Neukum
2017-04-06  8:41     ` David Howells
2017-04-06  8:41       ` David Howells
2017-04-06 20:09       ` Rafael J. Wysocki
2017-04-06 20:09         ` Rafael J. Wysocki
2017-04-06 20:09         ` Rafael J. Wysocki
2017-04-06 20:12         ` Rafael J. Wysocki
2017-04-06 20:12           ` Rafael J. Wysocki
2017-04-06 20:25           ` Jiri Kosina
2017-04-06 20:25             ` Jiri Kosina
2017-04-08  3:28             ` poma
2017-04-08  3:28               ` poma
2017-04-12 13:44               ` joeyli
2017-04-12 13:44                 ` joeyli
2017-04-06  6:55   ` David Howells
2017-04-06  6:55     ` David Howells
2017-04-06 20:07     ` Rafael J. Wysocki
2017-04-06 20:07       ` Rafael J. Wysocki
2017-04-05 20:16 ` [PATCH 12/24] PCI: Lock down BAR access " David Howells
2017-04-05 20:16   ` David Howells
2017-04-18 17:50   ` Bjorn Helgaas
2017-04-18 17:50     ` Bjorn Helgaas
2017-04-18 17:50     ` Bjorn Helgaas
2017-04-05 20:16 ` [PATCH 13/24] x86: Lock down IO port " David Howells
2017-04-05 20:16   ` David Howells
2017-04-05 20:16   ` David Howells
2017-04-14 18:28   ` Thomas Gleixner
2017-04-14 18:28     ` Thomas Gleixner
2017-04-14 18:28     ` Thomas Gleixner
2017-04-05 20:16 ` [PATCH 14/24] x86: Restrict MSR " David Howells
2017-04-05 20:16   ` David Howells
2017-04-14 18:30   ` Thomas Gleixner
2017-04-14 18:30     ` Thomas Gleixner
2017-04-05 20:16 ` [PATCH 15/24] asus-wmi: Restrict debugfs interface " David Howells
2017-04-05 20:16   ` David Howells
2017-04-07 10:25   ` Andy Shevchenko
2017-04-07 10:25     ` Andy Shevchenko
2017-04-07 12:50   ` David Howells
2017-04-07 12:50     ` David Howells
2017-04-09 11:10     ` Andy Shevchenko
2017-04-09 11:10       ` Andy Shevchenko
2017-04-10 13:16     ` David Howells
2017-04-10 13:16       ` David Howells
2017-04-18  6:06       ` Andy Shevchenko
2017-04-18  6:06         ` Andy Shevchenko
2017-04-18  6:06         ` Andy Shevchenko
2017-04-18 14:34         ` Ben Hutchings
2017-04-18 14:34           ` Ben Hutchings
2017-04-18 14:55         ` David Howells
2017-04-18 14:55           ` David Howells
2017-04-18 14:55           ` David Howells
2017-04-18 15:19           ` Ben Hutchings
2017-04-18 15:19             ` Ben Hutchings
2017-04-18 15:34           ` David Howells
2017-04-18 15:34             ` David Howells
2017-04-18 15:34             ` David Howells
2017-04-18 15:30         ` David Howells
2017-04-18 15:30           ` David Howells
2017-04-18 17:39           ` Ben Hutchings
2017-04-18 17:39             ` Ben Hutchings
2017-04-18 17:39             ` Ben Hutchings
2017-04-05 20:16 ` [PATCH 16/24] ACPI: Limit access to custom_method " David Howells
2017-04-05 20:16   ` David Howells
2017-04-05 20:16 ` [PATCH 17/24] acpi: Ignore acpi_rsdp kernel param when the kernel has been " David Howells
2017-04-05 20:16   ` David Howells
2017-04-06 19:43   ` Rafael J. Wysocki
2017-04-06 19:43     ` Rafael J. Wysocki
2017-04-07  6:31     ` Dave Young
2017-04-07  6:31       ` Dave Young
     [not found]     ` <20170407063107.GA10451-0VdLhd/A9Pl+NNSt+8eSiB/sF2h8X+2i0E9HWUfgJXw@public.gmane.org>
2017-04-07  7:05       ` David Howells
2017-04-07  7:05         ` David Howells
2017-04-07  7:05         ` David Howells
2017-04-07  7:39         ` Dave Young
2017-04-07  7:39           ` Dave Young
2017-04-05 20:17 ` [PATCH 18/24] acpi: Disable ACPI table override if the kernel is " David Howells
2017-04-05 20:17   ` David Howells
2017-04-05 20:17 ` [PATCH 19/24] acpi: Disable APEI error injection " David Howells
2017-04-05 20:17   ` David Howells
2017-04-05 20:17 ` [PATCH 20/24] bpf: Restrict kernel image access functions when " David Howells
2017-04-05 20:17   ` David Howells
2017-04-06 12:29   ` Alexei Starovoitov
2017-04-06 12:29     ` Alexei Starovoitov
2017-04-06 12:40     ` Ard Biesheuvel
2017-04-06 12:40       ` Ard Biesheuvel
2017-04-12 14:57   ` joeyli
2017-04-12 14:57     ` joeyli
2017-04-12 14:57     ` joeyli
2017-04-13  8:46   ` David Howells
2017-04-13  8:46     ` David Howells
2017-04-05 20:17 ` [PATCH 21/24] scsi: Lock down the eata driver David Howells
2017-04-05 20:17   ` David Howells
2017-04-05 20:17 ` [PATCH 22/24] Prohibit PCMCIA CIS storage when the kernel is locked down David Howells
2017-04-05 20:17   ` David Howells
2017-04-05 20:17   ` David Howells
2017-04-05 20:17 ` [PATCH 23/24] Lock down TIOCSSERIAL David Howells
2017-04-05 20:17   ` David Howells
2017-04-05 20:17   ` David Howells
2017-04-05 20:18 ` [PATCH 24/24] Lock down module params that specify hardware parameters (eg. ioport) David Howells
2017-04-05 20:18   ` David Howells
2017-04-05 20:18   ` David Howells
2017-04-07 15:59 ` [PATCH 00/24] Kernel lockdown Austin S. Hemmelgarn
2017-04-07 15:59   ` Austin S. Hemmelgarn
2017-04-07 16:29   ` Justin Forbes
2017-04-07 16:29     ` Justin Forbes
2017-04-07 16:29     ` Justin Forbes
2017-04-10 23:15 ` Why kernel lockdown? David Howells
2017-04-10 23:15   ` David Howells
  -- strict thread matches above, loose matches on Subject: below --
2017-04-05 17:09 [PATCH 00/24] Kernel lockdown David Howells
2017-04-05 17:11 ` [PATCH 09/24] kexec_file: Disable at runtime if securelevel has been set David Howells
2017-04-05 17:11   ` David Howells

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