From: Dave Young <dyoung@redhat.com> To: "Rafael J. Wysocki" <rafael@kernel.org> Cc: David Howells <dhowells@redhat.com>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, gnomes@lxorguk.ukuu.org.uk, linux-efi@vger.kernel.org, Josh Boyer <jwboyer@redhat.com>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, ACPI Devel Maling List <linux-acpi@vger.kernel.org>, linux-security-module@vger.kernel.org, keyrings@vger.kernel.org, matthew.garrett@nebula.com Subject: Re: [PATCH 17/24] acpi: Ignore acpi_rsdp kernel param when the kernel has been locked down Date: Fri, 7 Apr 2017 14:31:07 +0800 [thread overview] Message-ID: <20170407063107.GA10451@dhcp-128-65.nay.redhat.com> (raw) In-Reply-To: <CAJZ5v0j580XfGHd+GVQe+7vuSGyxFzfrDOjYfOcGTnKZSvjCoA@mail.gmail.com> On 04/06/17 at 09:43pm, Rafael J. Wysocki wrote: > On Wed, Apr 5, 2017 at 10:16 PM, David Howells <dhowells@redhat.com> wrote: > > From: Josh Boyer <jwboyer@redhat.com> > > > > This option allows userspace to pass the RSDP address to the kernel, which > > makes it possible for a user to circumvent any restrictions imposed on > > loading modules. Ignore the option when the kernel is locked down. > > I'm not really sure here. > > What exactly is the mechanism? Actually this acpi_rsdp param is created for EFI kexec reboot in old days when we had not supported persistent efi vm space across kexec reboot. At that time kexec reboot runs as noefi mode, it can not find the acpi root table thus kernel will hang early. Now kexec can support EFI boot so this param is not necessary for most user unless they still use efi=old_map. > > Thanks, > Rafael > -- > To unsubscribe from this list: send the line "unsubscribe linux-efi" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html
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From: dyoung@redhat.com (Dave Young) To: linux-security-module@vger.kernel.org Subject: [PATCH 17/24] acpi: Ignore acpi_rsdp kernel param when the kernel has been locked down Date: Fri, 7 Apr 2017 14:31:07 +0800 [thread overview] Message-ID: <20170407063107.GA10451@dhcp-128-65.nay.redhat.com> (raw) In-Reply-To: <CAJZ5v0j580XfGHd+GVQe+7vuSGyxFzfrDOjYfOcGTnKZSvjCoA@mail.gmail.com> On 04/06/17 at 09:43pm, Rafael J. Wysocki wrote: > On Wed, Apr 5, 2017 at 10:16 PM, David Howells <dhowells@redhat.com> wrote: > > From: Josh Boyer <jwboyer@redhat.com> > > > > This option allows userspace to pass the RSDP address to the kernel, which > > makes it possible for a user to circumvent any restrictions imposed on > > loading modules. Ignore the option when the kernel is locked down. > > I'm not really sure here. > > What exactly is the mechanism? Actually this acpi_rsdp param is created for EFI kexec reboot in old days when we had not supported persistent efi vm space across kexec reboot. At that time kexec reboot runs as noefi mode, it can not find the acpi root table thus kernel will hang early. Now kexec can support EFI boot so this param is not necessary for most user unless they still use efi=old_map. > > Thanks, > Rafael > -- > To unsubscribe from this list: send the line "unsubscribe linux-efi" in > the body of a message to majordomo at vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-security-module" in the body of a message to majordomo at vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
next prev parent reply other threads:[~2017-04-07 6:31 UTC|newest] Thread overview: 214+ 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 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 [this message] 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 17:12 ` [PATCH 17/24] acpi: Ignore acpi_rsdp kernel param when the kernel has been locked down David Howells 2017-04-05 17:12 ` David Howells 2017-04-05 17:12 ` David Howells
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