From: Mimi Zohar <zohar@linux.vnet.ibm.com> To: "AKASHI, Takahiro" <takahiro.akashi@linaro.org>, "Luis R. Rodriguez" <mcgrof@kernel.org> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Linus Torvalds <torvalds@linux-foundation.org>, Jan Blunck <jblunck@infradead.org>, Julia Lawall <julia.lawall@lip6.fr>, David Howells <dhowells@redhat.com>, Marcus Meissner <meissner@suse.de>, Gary Lin <GLin@suse.com>, linux-security-module@vger.kernel.org, gnomes@lxorguk.ukuu.org.uk, linux-efi <linux-efi@vger.kernel.org>, linux-kernel@vger.kernel.org, Matthew Garrett <mjg59@google.com> Subject: Re: Firmware signing -- Re: [PATCH 00/27] security, efi: Add kernel lockdown Date: Wed, 08 Nov 2017 21:17:37 -0500 [thread overview] Message-ID: <1510193857.4484.95.camel@linux.vnet.ibm.com> (raw) In-Reply-To: <20171109014841.GF7859@linaro.org> > > IMHO that should just fail then, ie, a "locked down" kernel should not want to > > *pass* a firmware signature if such thing could not be done. > > > > Its no different than trying to verify a signed module on a "locked down" for > > which it has no signature. > > > > But perhaps I'm not understanding the issue well, let me know. > > My point is quite simple: > my_deviceA_init() { > err = request_firmware(&fw, "deviceA"); <--- (a) > if (err) > goto err_request; > > err = verify_firmware(fw); <--- (b) > if (err) > goto err_verify; > > load_fw_to_deviceA(fw); <--- (c) > ... > } > > As legacy device drivers does not have (b), there is no chance to > prevent loading a firmware at (c) for locked-down kernel. > > If you allow me to bring in yet another function, say > request_firmware_signable(), which should be used in place of (a) > for all verification-aware drivers, that would be fine. I really don't understand why you need a new function. The request_firmware() eventually calls kernel_read_file_from_path(), which already calls the pre and post LSM hooks. IMA-appraisal is already on these hooks verifying the requested firmware's signature. For systems with "lockdown" enabled, but without IMA-appraisal enabled, define a small, builtin LSM that sits on these LSM hooks and denies the unsigned firmware requests. Mimi > In this case, all the invocation of request_firmware() in legacy code > could be forced to fail in locked-down kernel. > > But I think that "signable" should be allowed to be combined with other > features of request_firmware variants like _(no)wait or _direct. > > -Takahiro AKASHI
WARNING: multiple messages have this Message-ID (diff)
From: zohar@linux.vnet.ibm.com (Mimi Zohar) To: linux-security-module@vger.kernel.org Subject: Firmware signing -- Re: [PATCH 00/27] security, efi: Add kernel lockdown Date: Wed, 08 Nov 2017 21:17:37 -0500 [thread overview] Message-ID: <1510193857.4484.95.camel@linux.vnet.ibm.com> (raw) In-Reply-To: <20171109014841.GF7859@linaro.org> > > IMHO that should just fail then, ie, a "locked down" kernel should not want to > > *pass* a firmware signature if such thing could not be done. > > > > Its no different than trying to verify a signed module on a "locked down" for > > which it has no signature. > > > > But perhaps I'm not understanding the issue well, let me know. > > My point is quite simple: > my_deviceA_init() { > err = request_firmware(&fw, "deviceA"); <--- (a) > if (err) > goto err_request; > > err = verify_firmware(fw); <--- (b) > if (err) > goto err_verify; > > load_fw_to_deviceA(fw); <--- (c) > ... > } > > As legacy device drivers does not have (b), there is no chance to > prevent loading a firmware at (c) for locked-down kernel. > > If you allow me to bring in yet another function, say > request_firmware_signable(), which should be used in place of (a) > for all verification-aware drivers, that would be fine. I really don't understand why you need a new function.??The request_firmware() eventually calls kernel_read_file_from_path(), which already calls the pre and post LSM hooks. IMA-appraisal is already on these hooks verifying the requested firmware's signature. ?For systems with "lockdown" enabled, but without IMA-appraisal enabled, define a small, builtin LSM that sits on these LSM hooks and denies the unsigned firmware requests. Mimi > In this case, all the invocation of request_firmware() in legacy code > could be forced to fail in locked-down kernel. > > But I think that "signable" should be allowed to be combined with other > features of request_firmware variants like _(no)wait or _direct. > > -Takahiro AKASHI -- 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:[~2017-11-09 2:17 UTC|newest] Thread overview: 359+ messages / expand[flat|nested] mbox.gz Atom feed top 2017-10-19 14:50 [PATCH 00/27] security, efi: Add kernel lockdown David Howells 2017-10-19 14:50 ` David Howells 2017-10-19 14:50 ` David Howells 2017-10-19 14:50 ` [PATCH 01/27] Add the ability to lock down access to the running kernel image David Howells 2017-10-19 14:50 ` David Howells 2017-10-20 23:19 ` James Morris 2017-10-20 23:19 ` James Morris 2017-10-19 14:50 ` [PATCH 02/27] Add a SysRq option to lift kernel lockdown David Howells 2017-10-19 14:50 ` David Howells 2017-10-19 17:20 ` Randy Dunlap 2017-10-19 17:20 ` Randy Dunlap 2017-10-19 17:20 ` Randy Dunlap 2017-10-19 22:12 ` David Howells 2017-10-19 22:12 ` David Howells 2017-10-19 22:12 ` David Howells 2017-11-07 17:39 ` Thiago Jung Bauermann 2017-11-07 17:39 ` Thiago Jung Bauermann 2017-11-07 22:56 ` David Howells 2017-11-07 22:56 ` David Howells 2017-10-19 14:50 ` [PATCH 03/27] Enforce module signatures if the kernel is locked down David Howells 2017-10-19 14:50 ` David Howells 2017-10-20 6:33 ` joeyli 2017-10-20 6:33 ` joeyli 2017-10-20 6:33 ` joeyli 2017-10-20 23:21 ` James Morris 2017-10-20 23:21 ` James Morris 2017-10-27 18:48 ` Mimi Zohar 2017-10-27 18:48 ` Mimi Zohar 2017-10-30 17:00 ` David Howells 2017-10-30 17:00 ` David Howells 2017-10-30 17:52 ` Mimi Zohar 2017-10-30 17:52 ` Mimi Zohar 2017-11-02 17:22 ` David Howells 2017-11-02 17:22 ` David Howells 2017-11-02 17:22 ` David Howells 2017-11-02 19:13 ` Mimi Zohar 2017-11-02 19:13 ` Mimi Zohar 2017-11-02 21:30 ` David Howells 2017-11-02 21:30 ` David Howells 2017-11-02 21:30 ` David Howells 2017-11-02 21:41 ` Mimi Zohar 2017-11-02 21:41 ` Mimi Zohar 2017-11-02 21:41 ` Mimi Zohar 2017-11-02 22:01 ` David Howells 2017-11-02 22:01 ` David Howells 2017-11-02 22:01 ` David Howells 2017-11-02 22:18 ` Mimi Zohar 2017-11-02 22:18 ` Mimi Zohar 2017-10-19 14:51 ` [PATCH 04/27] Restrict /dev/mem and /dev/kmem when " David Howells 2017-10-19 14:51 ` David Howells 2017-10-20 6:37 ` joeyli 2017-10-20 6:37 ` joeyli 2017-10-20 23:21 ` James Morris 2017-10-20 23:21 ` James Morris 2017-10-19 14:51 ` [PATCH 05/27] kexec: Disable at runtime if " David Howells 2017-10-19 14:51 ` David Howells 2017-10-20 6:38 ` joeyli 2017-10-20 6:38 ` joeyli 2017-10-20 23:22 ` James Morris 2017-10-20 23:22 ` James Morris 2017-10-19 14:51 ` [PATCH 06/27] Copy secure_boot flag in boot params across kexec reboot David Howells 2017-10-19 14:51 ` David Howells 2017-10-20 6:40 ` joeyli 2017-10-20 6:40 ` joeyli 2017-10-20 6:40 ` joeyli 2017-10-19 14:51 ` [PATCH 07/27] kexec_file: Disable at runtime if securelevel has been set David Howells 2017-10-19 14:51 ` David Howells 2017-10-20 23:26 ` James Morris 2017-10-20 23:26 ` James Morris 2017-10-23 15:54 ` Mimi Zohar 2017-10-23 15:54 ` Mimi Zohar 2017-10-23 15:54 ` Mimi Zohar 2017-10-26 7:42 ` joeyli 2017-10-26 7:42 ` joeyli 2017-10-26 14:17 ` Mimi Zohar 2017-10-26 14:17 ` Mimi Zohar 2017-10-27 19:30 ` Mimi Zohar 2017-10-27 19:30 ` Mimi Zohar 2017-10-27 19:32 ` Mimi Zohar 2017-10-27 19:32 ` Mimi Zohar 2017-10-27 19:32 ` Mimi Zohar 2017-10-28 8:34 ` joeyli 2017-10-28 8:34 ` joeyli 2017-10-29 22:26 ` Mimi Zohar 2017-10-29 22:26 ` Mimi Zohar 2017-10-29 22:26 ` Mimi Zohar 2017-10-30 9:00 ` David Howells 2017-10-30 9:00 ` David Howells 2017-10-30 12:01 ` Mimi Zohar 2017-10-30 12:01 ` Mimi Zohar 2017-10-26 15:02 ` David Howells 2017-10-26 15:02 ` David Howells 2017-10-26 15:46 ` Mimi Zohar 2017-10-26 15:46 ` Mimi Zohar 2017-10-26 15:46 ` Mimi Zohar 2017-10-30 15:49 ` David Howells 2017-10-30 15:49 ` David Howells 2017-10-30 16:43 ` Mimi Zohar 2017-10-30 16:43 ` Mimi Zohar 2017-10-30 16:43 ` Mimi Zohar 2017-11-02 17:00 ` David Howells 2017-11-02 17:00 ` David Howells 2017-10-26 14:51 ` David Howells 2017-10-26 14:51 ` David Howells 2017-10-26 14:51 ` David Howells 2017-11-02 17:29 ` David Howells 2017-11-02 17:29 ` David Howells 2017-11-02 17:29 ` David Howells 2017-10-19 14:51 ` [PATCH 08/27] hibernate: Disable when the kernel is locked down David Howells 2017-10-19 14:51 ` David Howells 2017-10-20 6:40 ` joeyli 2017-10-20 6:40 ` joeyli 2017-10-20 6:40 ` joeyli 2017-10-19 14:51 ` [PATCH 09/27] uswsusp: " David Howells 2017-10-19 14:51 ` David Howells 2017-10-20 6:41 ` joeyli 2017-10-20 6:41 ` joeyli 2017-10-20 23:29 ` James Morris 2017-10-20 23:29 ` James Morris 2017-10-20 23:29 ` James Morris 2017-10-19 14:51 ` [PATCH 10/27] PCI: Lock down BAR access " David Howells 2017-10-19 14:51 ` David Howells 2017-10-20 6:42 ` joeyli 2017-10-20 6:42 ` joeyli 2017-10-20 6:42 ` joeyli 2017-10-19 14:51 ` [PATCH 11/27] x86: Lock down IO port " David Howells 2017-10-19 14:51 ` David Howells 2017-10-20 6:43 ` joeyli 2017-10-20 6:43 ` joeyli 2017-10-19 14:52 ` [PATCH 12/27] x86/msr: Restrict MSR " David Howells 2017-10-19 14:52 ` David Howells 2017-10-20 6:43 ` joeyli 2017-10-20 6:43 ` joeyli 2017-10-20 18:09 ` Alan Cox 2017-10-20 18:09 ` Alan Cox 2017-10-20 20:48 ` David Howells 2017-10-20 20:48 ` David Howells 2017-10-20 20:48 ` David Howells 2017-10-21 4:39 ` joeyli 2017-10-21 4:39 ` joeyli 2017-10-23 14:49 ` David Howells 2017-10-23 14:49 ` David Howells 2017-10-23 14:49 ` David Howells 2017-10-25 14:03 ` joeyli 2017-10-25 14:03 ` joeyli 2017-10-19 14:52 ` [PATCH 13/27] asus-wmi: Restrict debugfs interface " David Howells 2017-10-19 14:52 ` David Howells 2017-10-20 6:44 ` joeyli 2017-10-20 6:44 ` joeyli 2017-10-19 14:52 ` [PATCH 14/27] ACPI: Limit access to custom_method " David Howells 2017-10-19 14:52 ` David Howells 2017-10-20 6:45 ` joeyli 2017-10-20 6:45 ` joeyli 2017-10-19 14:52 ` [PATCH 15/27] acpi: Ignore acpi_rsdp kernel param when the kernel has been " David Howells 2017-10-19 14:52 ` David Howells 2017-10-20 6:45 ` joeyli 2017-10-20 6:45 ` joeyli 2017-10-19 14:52 ` [PATCH 16/27] acpi: Disable ACPI table override if the kernel is " David Howells 2017-10-19 14:52 ` David Howells 2017-10-20 6:46 ` joeyli 2017-10-20 6:46 ` joeyli 2017-10-20 6:46 ` joeyli 2017-10-19 14:52 ` [PATCH 17/27] acpi: Disable APEI error injection " David Howells 2017-10-19 14:52 ` David Howells 2017-10-20 6:47 ` joeyli 2017-10-20 6:47 ` joeyli 2017-10-20 6:47 ` joeyli 2017-10-19 14:52 ` [PATCH 18/27] bpf: Restrict kernel image access functions when " David Howells 2017-10-19 14:52 ` David Howells 2017-10-19 22:18 ` Alexei Starovoitov 2017-10-19 22:18 ` Alexei Starovoitov 2017-10-20 2:47 ` joeyli 2017-10-20 2:47 ` joeyli 2017-10-20 8:08 ` David Howells 2017-10-20 8:08 ` David Howells 2017-10-20 15:57 ` jlee 2017-10-20 15:57 ` jlee at suse.com 2017-10-20 23:00 ` Alexei Starovoitov 2017-10-23 14:51 ` David Howells 2017-10-20 16:03 ` David Howells 2017-10-20 16:03 ` David Howells 2017-10-20 16:03 ` David Howells 2017-10-20 16:43 ` jlee 2017-10-20 16:43 ` jlee at suse.com 2017-10-23 14:53 ` David Howells 2017-10-23 14:53 ` David Howells 2017-10-25 7:07 ` joeyli 2017-10-25 7:07 ` joeyli 2017-10-25 7:07 ` joeyli 2017-10-19 22:48 ` David Howells 2017-10-19 22:48 ` David Howells 2017-10-19 23:31 ` Alexei Starovoitov 2017-10-19 23:31 ` Alexei Starovoitov 2017-10-19 23:31 ` Alexei Starovoitov 2017-11-09 17:15 ` David Howells 2017-11-09 17:15 ` David Howells 2017-10-19 14:52 ` [PATCH 19/27] scsi: Lock down the eata driver David Howells 2017-10-19 14:52 ` David Howells 2017-10-19 14:53 ` [PATCH 20/27] Prohibit PCMCIA CIS storage when the kernel is locked down David Howells 2017-10-19 14:53 ` David Howells 2017-10-19 14:53 ` [PATCH 21/27] Lock down TIOCSSERIAL David Howells 2017-10-19 14:53 ` David Howells 2017-10-19 14:53 ` [PATCH 22/27] Lock down module params that specify hardware parameters (eg. ioport) David Howells 2017-10-19 14:53 ` David Howells 2017-10-19 14:53 ` [PATCH 23/27] x86/mmiotrace: Lock down the testmmiotrace module David Howells 2017-10-19 14:53 ` David Howells 2017-10-19 14:53 ` [PATCH 24/27] debugfs: Disallow use of debugfs files when the kernel is locked down David Howells 2017-10-19 14:53 ` David Howells 2017-10-19 14:53 ` [PATCH 25/27] Lock down /proc/kcore David Howells 2017-10-19 14:53 ` David Howells 2017-10-21 2:11 ` James Morris 2017-10-21 2:11 ` James Morris 2017-10-23 14:56 ` David Howells 2017-10-23 14:56 ` David Howells 2017-10-19 14:53 ` [PATCH 26/27] efi: Add an EFI_SECURE_BOOT flag to indicate secure boot mode David Howells 2017-10-19 14:53 ` David Howells 2017-10-21 2:19 ` James Morris 2017-10-21 2:19 ` James Morris 2017-10-21 2:19 ` James Morris 2017-10-23 14:58 ` David Howells 2017-10-23 14:58 ` David Howells 2017-10-19 14:53 ` [PATCH 27/27] efi: Lock down the kernel if booted in " David Howells 2017-10-19 14:53 ` David Howells 2017-10-19 22:39 ` [PATCH 00/27] security, efi: Add kernel lockdown David Howells 2017-10-19 22:39 ` David Howells 2017-10-19 22:39 ` David Howells 2017-10-23 14:34 ` [PATCH 04/27] Restrict /dev/mem and /dev/kmem when the kernel is locked down David Howells 2017-10-23 14:34 ` David Howells 2017-10-23 14:34 ` David Howells 2017-10-24 10:48 ` Ethan Zhao 2017-10-24 10:48 ` Ethan Zhao 2017-10-24 10:48 ` Ethan Zhao 2017-10-24 14:56 ` David Howells 2017-10-24 14:56 ` David Howells 2017-11-02 22:01 ` [PATCH 00/27] security, efi: Add kernel lockdown Mimi Zohar 2017-11-02 22:01 ` Mimi Zohar 2017-11-02 22:04 ` Firmware signing -- " David Howells 2017-11-02 22:04 ` David Howells 2017-11-02 22:04 ` David Howells 2017-11-02 22:10 ` Mimi Zohar 2017-11-02 22:10 ` Mimi Zohar 2017-11-07 23:07 ` Luis R. Rodriguez 2017-11-07 23:07 ` Luis R. Rodriguez 2017-11-07 23:07 ` Luis R. Rodriguez 2017-11-08 6:15 ` AKASHI, Takahiro 2017-11-08 6:15 ` AKASHI, Takahiro 2017-11-08 6:15 ` AKASHI, Takahiro 2017-11-08 19:46 ` Luis R. Rodriguez 2017-11-08 19:46 ` Luis R. Rodriguez 2017-11-08 19:46 ` Luis R. Rodriguez 2017-11-09 1:48 ` AKASHI, Takahiro 2017-11-09 1:48 ` AKASHI, Takahiro 2017-11-09 1:48 ` AKASHI, Takahiro 2017-11-09 2:17 ` Mimi Zohar [this message] 2017-11-09 2:17 ` Mimi Zohar 2017-11-09 4:46 ` AKASHI, Takahiro 2017-11-09 4:46 ` AKASHI, Takahiro 2017-11-10 13:37 ` Mimi Zohar 2017-11-10 13:37 ` Mimi Zohar 2017-11-11 2:32 ` Alan Cox 2017-11-11 2:32 ` Alan Cox 2017-11-11 2:32 ` Alan Cox 2017-11-13 11:49 ` Mimi Zohar 2017-11-13 11:49 ` Mimi Zohar 2017-11-13 17:42 ` Luis R. Rodriguez 2017-11-13 17:42 ` Luis R. Rodriguez 2017-11-13 17:42 ` Luis R. Rodriguez 2017-11-13 21:08 ` Alan Cox 2017-11-13 21:08 ` Alan Cox 2017-12-04 19:51 ` Luis R. Rodriguez 2017-12-04 19:51 ` Luis R. Rodriguez 2017-12-04 19:51 ` Luis R. Rodriguez 2017-12-07 15:32 ` Alan Cox 2017-12-07 15:32 ` Alan Cox 2017-12-07 15:32 ` Alan Cox 2017-11-13 21:44 ` David Howells 2017-11-13 21:44 ` David Howells 2017-11-13 22:09 ` Linus Torvalds 2017-11-13 22:09 ` Linus Torvalds 2017-11-13 22:09 ` Linus Torvalds 2017-11-14 0:20 ` Alan Cox 2017-11-14 0:20 ` Alan Cox 2017-11-14 0:20 ` Alan Cox 2017-11-14 12:21 ` Mimi Zohar 2017-11-14 12:21 ` Mimi Zohar 2017-11-14 12:38 ` Greg Kroah-Hartman 2017-11-14 12:38 ` Greg Kroah-Hartman 2017-11-14 13:17 ` Mimi Zohar 2017-11-14 13:17 ` Mimi Zohar 2017-11-14 13:17 ` Mimi Zohar 2017-11-14 17:34 ` Linus Torvalds 2017-11-14 17:34 ` Linus Torvalds 2017-11-14 17:34 ` Linus Torvalds 2017-11-14 19:58 ` Matthew Garrett 2017-11-14 19:58 ` Matthew Garrett 2017-11-14 19:58 ` Matthew Garrett 2017-11-14 20:18 ` Linus Torvalds 2017-11-14 20:18 ` Linus Torvalds 2017-11-14 20:18 ` Linus Torvalds 2017-11-14 20:31 ` Matthew Garrett 2017-11-14 20:31 ` Matthew Garrett 2017-11-14 20:31 ` Matthew Garrett 2017-11-14 20:35 ` Linus Torvalds 2017-11-14 20:35 ` Linus Torvalds 2017-11-14 20:37 ` Matthew Garrett 2017-11-14 20:37 ` Matthew Garrett 2017-11-14 20:37 ` Matthew Garrett 2017-11-14 20:50 ` Luis R. Rodriguez 2017-11-14 20:50 ` Luis R. Rodriguez 2017-11-14 20:55 ` Matthew Garrett 2017-11-14 20:55 ` Matthew Garrett 2017-11-14 20:55 ` Matthew Garrett 2017-11-14 22:14 ` James Bottomley 2017-11-14 22:14 ` James Bottomley 2017-11-14 22:17 ` Matthew Garrett 2017-11-14 22:17 ` Matthew Garrett 2017-11-14 22:17 ` Matthew Garrett 2017-11-14 22:31 ` James Bottomley 2017-11-14 22:31 ` James Bottomley 2017-11-14 22:31 ` James Bottomley 2017-11-14 22:34 ` Matthew Garrett 2017-11-14 22:34 ` Matthew Garrett 2017-11-14 22:34 ` Matthew Garrett 2017-11-15 11:49 ` Mimi Zohar 2017-11-15 11:49 ` Mimi Zohar 2017-11-15 11:49 ` Mimi Zohar 2017-11-15 17:52 ` Luis R. Rodriguez 2017-11-15 17:52 ` Luis R. Rodriguez 2017-11-15 17:52 ` Luis R. Rodriguez 2017-11-15 19:56 ` Mimi Zohar 2017-11-15 19:56 ` Mimi Zohar 2017-11-15 20:46 ` Luis R. Rodriguez 2017-11-15 20:46 ` Luis R. Rodriguez 2017-11-16 0:05 ` Mimi Zohar 2017-11-16 0:05 ` Mimi Zohar 2017-12-05 10:27 ` Pavel Machek 2017-12-05 10:27 ` Pavel Machek 2017-12-07 23:02 ` Luis R. Rodriguez 2017-12-07 23:02 ` Luis R. Rodriguez 2017-12-07 23:02 ` Luis R. Rodriguez 2017-12-08 17:11 ` Alan Cox 2017-12-08 17:11 ` Alan Cox 2017-12-08 17:11 ` Alan Cox 2017-11-10 1:46 ` Luis R. Rodriguez 2017-11-10 1:46 ` Luis R. Rodriguez 2017-11-10 1:46 ` Luis R. Rodriguez 2017-11-10 13:45 ` Mimi Zohar 2017-11-10 13:45 ` Mimi Zohar 2017-11-10 13:45 ` Mimi Zohar 2017-11-13 18:50 ` Luis R. Rodriguez 2017-11-13 18:50 ` Luis R. Rodriguez 2017-11-13 18:50 ` Luis R. Rodriguez 2017-11-13 19:08 ` Luis R. Rodriguez 2017-11-13 19:08 ` Luis R. Rodriguez 2017-11-13 19:08 ` Luis R. Rodriguez 2017-11-08 20:01 ` Mimi Zohar 2017-11-08 20:01 ` Mimi Zohar 2017-11-08 20:09 ` Luis R. Rodriguez 2017-11-08 20:09 ` Luis R. Rodriguez
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