Re: [PATCH] tracefs: Restrict tracefs when the kernel is locked down

[PATCH V36 00/29] security: Add kernel lockdown functionality · Matthew Garrett <hidden> · 2019-07-18
[PATCH V36 01/29] security: Support early LSMs · Matthew Garrett <hidden> · 2019-07-18
Re: [PATCH V36 01/29] security: Support early LSMs · Casey Schaufler <casey@schaufler-ca.com> · 2019-07-18
[PATCH V36 02/29] security: Add a "locked down" LSM hook · Matthew Garrett <hidden> · 2019-07-18
Re: [PATCH V36 02/29] security: Add a "locked down" LSM hook · Casey Schaufler <casey@schaufler-ca.com> · 2019-07-18
[PATCH V36 03/29] security: Add a static lockdown policy LSM · Matthew Garrett <hidden> · 2019-07-18
[PATCH V36 05/29] Restrict /dev/{mem,kmem,port} when the kernel is locked down · Matthew Garrett <hidden> · 2019-07-18
[PATCH V36 06/29] kexec_load: Disable at runtime if the kernel is locked down · Matthew Garrett <hidden> · 2019-07-18
[PATCH V36 07/29] Copy secure_boot flag in boot params across kexec reboot · Matthew Garrett <hidden> · 2019-07-18
[PATCH V36 09/29] kexec_file: Restrict at runtime if the kernel is locked down · Matthew Garrett <hidden> · 2019-07-18
[PATCH V36 11/29] PCI: Lock down BAR access when the kernel is locked down · Matthew Garrett <hidden> · 2019-07-18
[PATCH V36 14/29] ACPI: Limit access to custom_method when the kernel is locked down · Matthew Garrett <hidden> · 2019-07-18
[PATCH V36 13/29] x86/msr: Restrict MSR access when the kernel is locked down · Matthew Garrett <hidden> · 2019-07-18
[PATCH V36 17/29] Prohibit PCMCIA CIS storage when the kernel is locked down · Matthew Garrett <hidden> · 2019-07-18
[PATCH V36 18/29] Lock down TIOCSSERIAL · Matthew Garrett <hidden> · 2019-07-18
[PATCH V36 20/29] x86/mmiotrace: Lock down the testmmiotrace module · Matthew Garrett <hidden> · 2019-07-18
Re: [PATCH V36 20/29] x86/mmiotrace: Lock down the testmmiotrace module · Kees Cook <hidden> · 2019-07-18
[PATCH V36 21/29] Lock down /proc/kcore · Matthew Garrett <hidden> · 2019-07-18
[PATCH V36 22/29] Lock down tracing and perf kprobes when in confidentiality mode · Matthew Garrett <hidden> · 2019-07-18
[PATCH V36 23/29] bpf: Restrict bpf when kernel lockdown is in confidentiality mode · Matthew Garrett <hidden> · 2019-07-18
Re: [PATCH V36 23/29] bpf: Restrict bpf when kernel lockdown is in confidentiality mode · Kees Cook <hidden> · 2019-07-18
Re: [PATCH V36 23/29] bpf: Restrict bpf when kernel lockdown is in confidentiality mode · Matthew Garrett <hidden> · 2019-07-29
[PATCH V36 24/29] Lock down perf when in confidentiality mode · Matthew Garrett <hidden> · 2019-07-18
[PATCH V36 27/29] tracefs: Restrict tracefs when the kernel is locked down · Matthew Garrett <hidden> · 2019-07-18
Re: [PATCH V36 27/29] tracefs: Restrict tracefs when the kernel is locked down · Steven Rostedt <rostedt@goodmis.org> · 2019-07-25
[PATCH] tracefs: Restrict tracefs when the kernel is locked down · Matthew Garrett <hidden> · 2019-07-30
Re: [PATCH] tracefs: Restrict tracefs when the kernel is locked down · Steven Rostedt <rostedt@goodmis.org> · 2019-07-31
[PATCH V36 29/29] lockdown: Print current->comm in restriction messages · Matthew Garrett <hidden> · 2019-07-18
[PATCH V36 28/29] efi: Restrict efivar_ssdt_load when the kernel is locked down · Matthew Garrett <hidden> · 2019-07-18
[PATCH V36 26/29] debugfs: Restrict debugfs when the kernel is locked down · Matthew Garrett <hidden> · 2019-07-18
[PATCH V36 25/29] kexec: Allow kexec_file() with appropriate IMA policy when locked down · Matthew Garrett <hidden> · 2019-07-18
[PATCH V36 19/29] Lock down module params that specify hardware parameters (eg. ioport) · Matthew Garrett <hidden> · 2019-07-18
Re: [PATCH V36 19/29] Lock down module params that specify hardware parameters (eg. ioport) · Matthew Garrett <hidden> · 2019-07-29
[PATCH V36 15/29] acpi: Ignore acpi_rsdp kernel param when the kernel has been locked down · Matthew Garrett <hidden> · 2019-07-18
[PATCH V36 16/29] acpi: Disable ACPI table override if the kernel is locked down · Matthew Garrett <hidden> · 2019-07-18
[PATCH V36 12/29] x86: Lock down IO port access when the kernel is locked down · Matthew Garrett <hidden> · 2019-07-18
[PATCH V36 10/29] hibernate: Disable when the kernel is locked down · Matthew Garrett <hidden> · 2019-07-18
[PATCH V36 04/29] Enforce module signatures if the kernel is locked down · Matthew Garrett <hidden> · 2019-07-18
[PATCH V36 08/29] kexec_file: split KEXEC_VERIFY_SIG into KEXEC_SIG and KEXEC_SIG_FORCE · Matthew Garrett <hidden> · 2019-07-18

From: Steven Rostedt <rostedt@goodmis.org>
Date: 2019-07-31 01:48:11
Also in: linux-api, lkml

On Tue, 30 Jul 2019 11:47:34 -0700
Matthew Garrett [off-list ref] wrote:

Tracefs may release more information about the kernel than desirable, so
restrict it when the kernel is locked down in confidentiality mode by
preventing open().

Signed-off-by: Matthew Garrett <redacted>
Cc: Steven Rostedt <rostedt@goodmis.org>

Reviewed-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

-- Steve

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