From: Steven Rostedt <rostedt@goodmis.org>
To: Matthew Garrett <matthewgarrett@google.com>
Cc: jmorris@namei.org, linux-security-module@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-api@vger.kernel.org,
Matthew Garrett <mjg59@google.com>
Subject: Re: [PATCH V36 27/29] tracefs: Restrict tracefs when the kernel is locked down
Date: Wed, 24 Jul 2019 22:23:54 -0400 [thread overview]
Message-ID: <20190724222354.7cbd6c6e@oasis.local.home> (raw)
In-Reply-To: <20190718194415.108476-28-matthewgarrett@google.com>
On Thu, 18 Jul 2019 12:44:13 -0700
Matthew Garrett <matthewgarrett@google.com> wrote:
> @@ -387,6 +412,7 @@ struct dentry *tracefs_create_file(const char *name, umode_t mode,
> struct dentry *parent, void *data,
> const struct file_operations *fops)
> {
> + struct file_operations *proxy_fops;
> struct dentry *dentry;
> struct inode *inode;
>
> @@ -402,8 +428,18 @@ struct dentry *tracefs_create_file(const char *name, umode_t mode,
> if (unlikely(!inode))
> return failed_creating(dentry);
>
> + proxy_fops = kzalloc(sizeof(struct file_operations), GFP_KERNEL);
> + if (!proxy_fops)
I believe we need "iput(inode);" here. Or move the allocation before
the inode allocation and free it on inode failure.
-- Steve
> + return failed_creating(dentry);
> +
> + if (!fops)
> + fops = &tracefs_file_operations;
> +
> + dentry->d_fsdata = (void *)fops;
> + memcpy(proxy_fops, fops, sizeof(*proxy_fops));
> + proxy_fops->open = default_open_file;
> inode->i_mode = mode;
> - inode->i_fop = fops ? fops : &tracefs_file_operations;
> + inode->i_fop = proxy_fops;
> inode->i_private = data;
> d_instantiate(dentry, inode);
> fsnotify_create(dentry->d_parent->d_inode, dentry);
next prev parent reply other threads:[~2019-07-25 2:23 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-18 19:43 [PATCH V36 00/29] security: Add kernel lockdown functionality Matthew Garrett
2019-07-18 19:43 ` [PATCH V36 01/29] security: Support early LSMs Matthew Garrett
2019-07-18 20:02 ` Casey Schaufler
2019-07-18 19:43 ` [PATCH V36 02/29] security: Add a "locked down" LSM hook Matthew Garrett
2019-07-18 20:03 ` Casey Schaufler
2019-07-18 19:43 ` [PATCH V36 03/29] security: Add a static lockdown policy LSM Matthew Garrett
2019-07-18 19:43 ` [PATCH V36 04/29] Enforce module signatures if the kernel is locked down Matthew Garrett
2019-07-18 19:43 ` [PATCH V36 05/29] Restrict /dev/{mem,kmem,port} when " Matthew Garrett
2019-07-18 19:43 ` [PATCH V36 06/29] kexec_load: Disable at runtime if " Matthew Garrett
2019-07-18 19:43 ` [PATCH V36 07/29] Copy secure_boot flag in boot params across kexec reboot Matthew Garrett
2019-07-18 19:43 ` [PATCH V36 08/29] kexec_file: split KEXEC_VERIFY_SIG into KEXEC_SIG and KEXEC_SIG_FORCE Matthew Garrett
2019-07-18 19:43 ` [PATCH V36 09/29] kexec_file: Restrict at runtime if the kernel is locked down Matthew Garrett
2019-07-18 19:43 ` [PATCH V36 10/29] hibernate: Disable when " Matthew Garrett
2019-07-18 19:43 ` [PATCH V36 11/29] PCI: Lock down BAR access " Matthew Garrett
2019-07-18 19:43 ` [PATCH V36 12/29] x86: Lock down IO port " Matthew Garrett
2019-07-18 19:43 ` [PATCH V36 13/29] x86/msr: Restrict MSR " Matthew Garrett
2019-07-18 19:44 ` [PATCH V36 14/29] ACPI: Limit access to custom_method " Matthew Garrett
2019-07-18 19:44 ` [PATCH V36 15/29] acpi: Ignore acpi_rsdp kernel param when the kernel has been " Matthew Garrett
2019-07-18 19:44 ` [PATCH V36 16/29] acpi: Disable ACPI table override if the kernel is " Matthew Garrett
2019-07-18 19:44 ` [PATCH V36 17/29] Prohibit PCMCIA CIS storage when " Matthew Garrett
2019-07-18 19:44 ` [PATCH V36 18/29] Lock down TIOCSSERIAL Matthew Garrett
2019-07-18 19:44 ` [PATCH V36 19/29] Lock down module params that specify hardware parameters (eg. ioport) Matthew Garrett
2019-07-29 21:47 ` Matthew Garrett
2019-07-18 19:44 ` [PATCH V36 20/29] x86/mmiotrace: Lock down the testmmiotrace module Matthew Garrett
2019-07-18 21:06 ` Kees Cook
2019-07-18 19:44 ` [PATCH V36 21/29] Lock down /proc/kcore Matthew Garrett
2019-07-18 19:44 ` [PATCH V36 22/29] Lock down tracing and perf kprobes when in confidentiality mode Matthew Garrett
2019-07-18 19:44 ` [PATCH V36 23/29] bpf: Restrict bpf when kernel lockdown is " Matthew Garrett
2019-07-18 21:06 ` Kees Cook
2019-07-29 21:47 ` Matthew Garrett
2019-07-18 19:44 ` [PATCH V36 24/29] Lock down perf when " Matthew Garrett
2019-07-18 19:44 ` [PATCH V36 25/29] kexec: Allow kexec_file() with appropriate IMA policy when locked down Matthew Garrett
2019-07-18 19:44 ` [PATCH V36 26/29] debugfs: Restrict debugfs when the kernel is " Matthew Garrett
2019-07-18 19:44 ` [PATCH V36 27/29] tracefs: Restrict tracefs " Matthew Garrett
2019-07-25 2:23 ` Steven Rostedt [this message]
2019-07-30 18:47 ` [PATCH] " Matthew Garrett
2019-07-31 1:48 ` Steven Rostedt
2019-07-18 19:44 ` [PATCH V36 28/29] efi: Restrict efivar_ssdt_load " Matthew Garrett
2019-07-18 19:44 ` [PATCH V36 29/29] lockdown: Print current->comm in restriction messages Matthew Garrett
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=20190724222354.7cbd6c6e@oasis.local.home \
--to=rostedt@goodmis.org \
--cc=jmorris@namei.org \
--cc=linux-api@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-security-module@vger.kernel.org \
--cc=matthewgarrett@google.com \
--cc=mjg59@google.com \
/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: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).