From: David Howells <dhowells@redhat.com> To: linux-security-module@vger.kernel.org Cc: gnomes@lxorguk.ukuu.org.uk, linux-efi@vger.kernel.org, matthew.garrett@nebula.com, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, dhowells@redhat.com, jforbes@redhat.com Subject: [PATCH 24/27] debugfs: Disallow use of debugfs files when the kernel is locked down Date: Thu, 19 Oct 2017 15:53:33 +0100 [thread overview] Message-ID: <150842481363.7923.13021827051686067882.stgit@warthog.procyon.org.uk> (raw) In-Reply-To: <150842463163.7923.11081723749106843698.stgit@warthog.procyon.org.uk> Disallow opening of debugfs files when the kernel is locked down as various drivers give raw access to hardware through debugfs. Accesses to tracefs should use /sys/kernel/tracing/ rather than /sys/kernel/debug/tracing/. Possibly a symlink should be emplaced. Normal device interaction should be done through configfs or a miscdev, not debugfs. Note that this makes it unnecessary to specifically lock down show_dsts(), show_devs() and show_call() in the asus-wmi driver. Signed-off-by: David Howells <dhowells@redhat.com> cc: Andy Shevchenko <andy.shevchenko@gmail.com> cc: acpi4asus-user@lists.sourceforge.net cc: platform-driver-x86@vger.kernel.org cc: Matthew Garrett <matthew.garrett@nebula.com> cc: Thomas Gleixner <tglx@linutronix.de> --- fs/debugfs/file.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/fs/debugfs/file.c b/fs/debugfs/file.c index 6dabc4a10396..32b5168a7e91 100644 --- a/fs/debugfs/file.c +++ b/fs/debugfs/file.c @@ -103,6 +103,9 @@ static int open_proxy_open(struct inode *inode, struct file *filp) const struct file_operations *real_fops = NULL; int srcu_idx, r; + if (kernel_is_locked_down("debugfs")) + return -EPERM; + r = debugfs_use_file_start(dentry, &srcu_idx); if (r) { r = -ENOENT; @@ -232,6 +235,9 @@ static int full_proxy_open(struct inode *inode, struct file *filp) struct file_operations *proxy_fops = NULL; int srcu_idx, r; + if (kernel_is_locked_down("debugfs")) + return -EPERM; + r = debugfs_use_file_start(dentry, &srcu_idx); if (r) { r = -ENOENT;
WARNING: multiple messages have this Message-ID (diff)
From: dhowells@redhat.com (David Howells) To: linux-security-module@vger.kernel.org Subject: [PATCH 24/27] debugfs: Disallow use of debugfs files when the kernel is locked down Date: Thu, 19 Oct 2017 15:53:33 +0100 [thread overview] Message-ID: <150842481363.7923.13021827051686067882.stgit@warthog.procyon.org.uk> (raw) In-Reply-To: <150842463163.7923.11081723749106843698.stgit@warthog.procyon.org.uk> Disallow opening of debugfs files when the kernel is locked down as various drivers give raw access to hardware through debugfs. Accesses to tracefs should use /sys/kernel/tracing/ rather than /sys/kernel/debug/tracing/. Possibly a symlink should be emplaced. Normal device interaction should be done through configfs or a miscdev, not debugfs. Note that this makes it unnecessary to specifically lock down show_dsts(), show_devs() and show_call() in the asus-wmi driver. Signed-off-by: David Howells <dhowells@redhat.com> cc: Andy Shevchenko <andy.shevchenko@gmail.com> cc: acpi4asus-user at lists.sourceforge.net cc: platform-driver-x86 at vger.kernel.org cc: Matthew Garrett <matthew.garrett@nebula.com> cc: Thomas Gleixner <tglx@linutronix.de> --- fs/debugfs/file.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/fs/debugfs/file.c b/fs/debugfs/file.c index 6dabc4a10396..32b5168a7e91 100644 --- a/fs/debugfs/file.c +++ b/fs/debugfs/file.c @@ -103,6 +103,9 @@ static int open_proxy_open(struct inode *inode, struct file *filp) const struct file_operations *real_fops = NULL; int srcu_idx, r; + if (kernel_is_locked_down("debugfs")) + return -EPERM; + r = debugfs_use_file_start(dentry, &srcu_idx); if (r) { r = -ENOENT; @@ -232,6 +235,9 @@ static int full_proxy_open(struct inode *inode, struct file *filp) struct file_operations *proxy_fops = NULL; int srcu_idx, r; + if (kernel_is_locked_down("debugfs")) + return -EPERM; + r = debugfs_use_file_start(dentry, &srcu_idx); if (r) { r = -ENOENT; -- 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:[~2017-10-19 14:53 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 ` David Howells [this message] 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 ` [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 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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