From: David Howells <dhowells@redhat.com> To: linux-kernel@vger.kernel.org Cc: gnomes@lxorguk.ukuu.org.uk, linux-efi@vger.kernel.org, Linn Crosetto <linn@hpe.com>, matthew.garrett@nebula.com, gregkh@linuxfoundation.org, dhowells@redhat.com, linux-security-module@vger.kernel.org, keyrings@vger.kernel.org Subject: [PATCH 19/24] acpi: Disable APEI error injection if the kernel is locked down Date: Wed, 05 Apr 2017 18:12:44 +0100 [thread overview] Message-ID: <149141236435.31282.18405211623757724751.stgit@warthog.procyon.org.uk> (raw) In-Reply-To: <149141219387.31282.6648284836568938717.stgit@warthog.procyon.org.uk> From: Linn Crosetto <linn@hpe.com> ACPI provides an error injection mechanism, EINJ, for debugging and testing the ACPI Platform Error Interface (APEI) and other RAS features. If supported by the firmware, ACPI specification 5.0 and later provide for a way to specify a physical memory address to which to inject the error. Injecting errors through EINJ can produce errors which to the platform are indistinguishable from real hardware errors. This can have undesirable side-effects, such as causing the platform to mark hardware as needing replacement. While it does not provide a method to load unauthenticated privileged code, the effect of these errors may persist across reboots and affect trust in the underlying hardware, so disable error injection through EINJ if the kernel is locked down. Signed-off-by: Linn Crosetto <linn@hpe.com> Signed-off-by: David Howells <dhowells@redhat.com> --- drivers/acpi/apei/einj.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/acpi/apei/einj.c b/drivers/acpi/apei/einj.c index ec50c32ea3da..e082718d01c2 100644 --- a/drivers/acpi/apei/einj.c +++ b/drivers/acpi/apei/einj.c @@ -518,6 +518,9 @@ static int einj_error_inject(u32 type, u32 flags, u64 param1, u64 param2, int rc; u64 base_addr, size; + if (kernel_is_locked_down()) + return -EPERM; + /* If user manually set "flags", make sure it is legal */ if (flags && (flags & ~(SETWA_FLAGS_APICID|SETWA_FLAGS_MEM|SETWA_FLAGS_PCIE_SBDF)))
WARNING: multiple messages have this Message-ID (diff)
From: dhowells@redhat.com (David Howells) To: linux-security-module@vger.kernel.org Subject: [PATCH 19/24] acpi: Disable APEI error injection if the kernel is locked down Date: Wed, 05 Apr 2017 18:12:44 +0100 [thread overview] Message-ID: <149141236435.31282.18405211623757724751.stgit@warthog.procyon.org.uk> (raw) In-Reply-To: <149141219387.31282.6648284836568938717.stgit@warthog.procyon.org.uk> From: Linn Crosetto <linn@hpe.com> ACPI provides an error injection mechanism, EINJ, for debugging and testing the ACPI Platform Error Interface (APEI) and other RAS features. If supported by the firmware, ACPI specification 5.0 and later provide for a way to specify a physical memory address to which to inject the error. Injecting errors through EINJ can produce errors which to the platform are indistinguishable from real hardware errors. This can have undesirable side-effects, such as causing the platform to mark hardware as needing replacement. While it does not provide a method to load unauthenticated privileged code, the effect of these errors may persist across reboots and affect trust in the underlying hardware, so disable error injection through EINJ if the kernel is locked down. Signed-off-by: Linn Crosetto <linn@hpe.com> Signed-off-by: David Howells <dhowells@redhat.com> --- drivers/acpi/apei/einj.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/acpi/apei/einj.c b/drivers/acpi/apei/einj.c index ec50c32ea3da..e082718d01c2 100644 --- a/drivers/acpi/apei/einj.c +++ b/drivers/acpi/apei/einj.c @@ -518,6 +518,9 @@ static int einj_error_inject(u32 type, u32 flags, u64 param1, u64 param2, int rc; u64 base_addr, size; + if (kernel_is_locked_down()) + return -EPERM; + /* If user manually set "flags", make sure it is legal */ if (flags && (flags & ~(SETWA_FLAGS_APICID|SETWA_FLAGS_MEM|SETWA_FLAGS_PCIE_SBDF))) -- 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:[~2017-04-05 17:13 UTC|newest] Thread overview: 67+ messages / expand[flat|nested] mbox.gz Atom feed top 2017-04-05 17:09 [PATCH 00/24] Kernel lockdown David Howells 2017-04-05 17:09 ` David Howells 2017-04-05 17:10 ` [PATCH 01/24] efi: Add EFI_SECURE_BOOT bit David Howells 2017-04-05 17:10 ` David Howells 2017-04-05 17:10 ` [PATCH 02/24] Add the ability to lock down access to the running kernel image David Howells 2017-04-05 17:10 ` David Howells 2017-04-06 8:44 ` James Morris 2017-04-06 8:44 ` James Morris 2017-04-06 8:44 ` James Morris 2017-04-06 10:43 ` David Howells 2017-04-06 10:43 ` David Howells 2017-04-06 21:55 ` James Morris 2017-04-06 21:55 ` James Morris 2017-04-06 21:55 ` James Morris 2017-04-05 17:10 ` [PATCH 03/24] efi: Lock down the kernel if booted in secure boot mode David Howells 2017-04-05 17:10 ` David Howells 2017-04-05 17:10 ` David Howells 2017-04-05 17:10 ` [PATCH 04/24] Enforce module signatures if the kernel is locked down David Howells 2017-04-05 17:10 ` David Howells 2017-04-05 17:10 ` David Howells 2017-04-05 17:10 ` [PATCH 05/24] Restrict /dev/mem and /dev/kmem when " David Howells 2017-04-05 17:10 ` David Howells 2017-04-05 17:10 ` [PATCH 06/24] Add a sysrq option to exit secure boot mode David Howells 2017-04-05 17:10 ` David Howells 2017-04-05 17:10 ` [PATCH 07/24] kexec: Disable at runtime if the kernel is locked down David Howells 2017-04-05 17:10 ` David Howells 2017-04-05 17:11 ` [PATCH 08/24] Copy secure_boot flag in boot params across kexec reboot David Howells 2017-04-05 17:11 ` 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 2017-04-05 17:11 ` [PATCH 10/24] hibernate: Disable when the kernel is locked down David Howells 2017-04-05 17:11 ` David Howells 2017-04-05 17:11 ` David Howells 2017-04-05 17:11 ` [PATCH 11/24] uswsusp: " David Howells 2017-04-05 17:11 ` David Howells 2017-04-05 17:11 ` [PATCH 12/24] PCI: Lock down BAR access " David Howells 2017-04-05 17:11 ` David Howells 2017-04-05 17:11 ` [PATCH 13/24] x86: Lock down IO port " David Howells 2017-04-05 17:11 ` David Howells 2017-04-05 17:12 ` [PATCH 14/24] x86: Restrict MSR " David Howells 2017-04-05 17:12 ` David Howells 2017-04-05 17:34 ` Kees Cook 2017-04-05 17:34 ` Kees Cook 2017-04-05 17:34 ` Kees Cook 2017-04-05 17:12 ` [PATCH 15/24] asus-wmi: Restrict debugfs interface " David Howells 2017-04-05 17:12 ` David Howells 2017-04-05 17:12 ` [PATCH 16/24] ACPI: Limit access to custom_method " David Howells 2017-04-05 17:12 ` David Howells 2017-04-05 17:12 ` David Howells 2017-04-05 17:12 ` [PATCH 17/24] acpi: Ignore acpi_rsdp kernel param when the kernel has been " David Howells 2017-04-05 17:12 ` David Howells 2017-04-05 17:12 ` David Howells 2017-04-05 17:12 ` [PATCH 18/24] acpi: Disable ACPI table override if the kernel is " David Howells 2017-04-05 17:12 ` David Howells 2017-04-05 17:12 ` David Howells [this message] 2017-04-05 17:12 ` [PATCH 19/24] acpi: Disable APEI error injection " David Howells 2017-04-05 19:57 ` [PATCH 00/24] Kernel lockdown David Howells 2017-04-05 19:57 ` David Howells 2017-04-05 19:57 ` David Howells 2017-04-06 8:25 ` James Morris 2017-04-06 8:25 ` James Morris 2017-04-06 8:25 ` James Morris 2017-04-06 8:37 ` David Howells 2017-04-06 8:37 ` David Howells 2017-04-06 8:37 ` David Howells 2017-04-05 20:14 David Howells 2017-04-05 20:17 ` [PATCH 19/24] acpi: Disable APEI error injection if the kernel is locked down David Howells 2017-04-05 20:17 ` David Howells
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