From: David Howells <dhowells@redhat.com> To: linux-kernel@vger.kernel.org Cc: Matthew Garrett <mjg59@srcf.ucam.org>, dhowells@redhat.com, linux-efi@vger.kernel.org, gnomes@lxorguk.ukuu.org.uk, gregkh@linuxfoundation.org, Chun-Yi Lee <jlee@suse.com>, linux-security-module@vger.kernel.org, keyrings@vger.kernel.org, matthew.garrett@nebula.com Subject: [PATCH 09/24] kexec_file: Disable at runtime if securelevel has been set Date: Wed, 05 Apr 2017 18:11:21 +0100 [thread overview] Message-ID: <149141228170.31282.6899985667525868658.stgit@warthog.procyon.org.uk> (raw) In-Reply-To: <149141219387.31282.6648284836568938717.stgit@warthog.procyon.org.uk> From: Chun-Yi Lee <joeyli.kernel@gmail.com> When KEXEC_VERIFY_SIG is not enabled, kernel should not loads image through kexec_file systemcall if securelevel has been set. This code was showed in Matthew's patch but not in git: https://lkml.org/lkml/2015/3/13/778 Cc: Matthew Garrett <mjg59@srcf.ucam.org> Signed-off-by: Chun-Yi Lee <jlee@suse.com> Signed-off-by: David Howells <dhowells@redhat.com> --- kernel/kexec_file.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c index b118735fea9d..f6937eecd1eb 100644 --- a/kernel/kexec_file.c +++ b/kernel/kexec_file.c @@ -268,6 +268,12 @@ SYSCALL_DEFINE5(kexec_file_load, int, kernel_fd, int, initrd_fd, if (!capable(CAP_SYS_BOOT) || kexec_load_disabled) return -EPERM; + /* Don't permit images to be loaded into trusted kernels if we're not + * going to verify the signature on them + */ + if (!IS_ENABLED(CONFIG_KEXEC_VERIFY_SIG) && kernel_is_locked_down()) + return -EPERM; + /* Make sure we have a legal set of flags */ if (flags != (flags & KEXEC_FILE_FLAGS)) return -EINVAL;
WARNING: multiple messages have this Message-ID (diff)
From: dhowells@redhat.com (David Howells) To: linux-security-module@vger.kernel.org Subject: [PATCH 09/24] kexec_file: Disable at runtime if securelevel has been set Date: Wed, 05 Apr 2017 18:11:21 +0100 [thread overview] Message-ID: <149141228170.31282.6899985667525868658.stgit@warthog.procyon.org.uk> (raw) In-Reply-To: <149141219387.31282.6648284836568938717.stgit@warthog.procyon.org.uk> From: Chun-Yi Lee <joeyli.kernel@gmail.com> When KEXEC_VERIFY_SIG is not enabled, kernel should not loads image through kexec_file systemcall if securelevel has been set. This code was showed in Matthew's patch but not in git: https://lkml.org/lkml/2015/3/13/778 Cc: Matthew Garrett <mjg59@srcf.ucam.org> Signed-off-by: Chun-Yi Lee <jlee@suse.com> Signed-off-by: David Howells <dhowells@redhat.com> --- kernel/kexec_file.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c index b118735fea9d..f6937eecd1eb 100644 --- a/kernel/kexec_file.c +++ b/kernel/kexec_file.c @@ -268,6 +268,12 @@ SYSCALL_DEFINE5(kexec_file_load, int, kernel_fd, int, initrd_fd, if (!capable(CAP_SYS_BOOT) || kexec_load_disabled) return -EPERM; + /* Don't permit images to be loaded into trusted kernels if we're not + * going to verify the signature on them + */ + if (!IS_ENABLED(CONFIG_KEXEC_VERIFY_SIG) && kernel_is_locked_down()) + return -EPERM; + /* Make sure we have a legal set of flags */ if (flags != (flags & KEXEC_FILE_FLAGS)) return -EINVAL; -- 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 17:11 UTC|newest] Thread overview: 120+ 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 ` David Howells [this message] 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 ` [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 ` [PATCH 19/24] acpi: Disable APEI error injection " David Howells 2017-04-05 17:12 ` 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 20:15 ` [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
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=149141228170.31282.6899985667525868658.stgit@warthog.procyon.org.uk \ --to=dhowells@redhat.com \ --cc=gnomes@lxorguk.ukuu.org.uk \ --cc=gregkh@linuxfoundation.org \ --cc=jlee@suse.com \ --cc=keyrings@vger.kernel.org \ --cc=linux-efi@vger.kernel.org \ --cc=linux-kernel@vger.kernel.org \ --cc=linux-security-module@vger.kernel.org \ --cc=matthew.garrett@nebula.com \ --cc=mjg59@srcf.ucam.org \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is an external index of several public inboxes, see mirroring instructions on how to clone and mirror all data and code used by this external index.