This is a note to let you know that I've just added the patch titled
x86/mm/dump_pagetables: Add page table directory to the debugfs VFS hierarchy
to the 4.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...
The filename of the patch is: x86-mm-dump_pagetables-add-page-table-directory-to-the-debugfs-vfs-hierarchy.patch and it can be found in the queue-4.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.
From 75298aa179d56cd64f54e58a19fffc8ab922b4c0 Mon Sep 17 00:00:00 2001
From: Borislav Petkov bp@suse.de Date: Mon, 4 Dec 2017 15:08:04 +0100 Subject: x86/mm/dump_pagetables: Add page table directory to the debugfs VFS hierarchy
From: Borislav Petkov bp@suse.de
commit 75298aa179d56cd64f54e58a19fffc8ab922b4c0 upstream.
The upcoming support for dumping the kernel and the user space page tables of the current process would create more random files in the top level debugfs directory.
Add a page table directory and move the existing file to it.
Signed-off-by: Borislav Petkov bp@suse.de Signed-off-by: Thomas Gleixner tglx@linutronix.de Cc: Andy Lutomirski luto@kernel.org Cc: Boris Ostrovsky boris.ostrovsky@oracle.com Cc: Borislav Petkov bp@alien8.de Cc: Brian Gerst brgerst@gmail.com Cc: Dave Hansen dave.hansen@linux.intel.com Cc: David Laight David.Laight@aculab.com Cc: Denys Vlasenko dvlasenk@redhat.com Cc: Eduardo Valentin eduval@amazon.com Cc: Greg KH gregkh@linuxfoundation.org Cc: H. Peter Anvin hpa@zytor.com Cc: Josh Poimboeuf jpoimboe@redhat.com Cc: Juergen Gross jgross@suse.com Cc: Linus Torvalds torvalds@linux-foundation.org Cc: Peter Zijlstra peterz@infradead.org Cc: Will Deacon will.deacon@arm.com Cc: aliguori@amazon.com Cc: daniel.gruss@iaik.tugraz.at Cc: hughd@google.com Cc: keescook@google.com Signed-off-by: Ingo Molnar mingo@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- arch/x86/mm/debug_pagetables.c | 15 ++++++++++----- 1 file changed, 10 insertions(+), 5 deletions(-)
--- a/arch/x86/mm/debug_pagetables.c +++ b/arch/x86/mm/debug_pagetables.c @@ -22,21 +22,26 @@ static const struct file_operations ptdu .release = single_release, };
-static struct dentry *pe; +static struct dentry *dir, *pe;
static int __init pt_dump_debug_init(void) { - pe = debugfs_create_file("kernel_page_tables", S_IRUSR, NULL, NULL, - &ptdump_fops); - if (!pe) + dir = debugfs_create_dir("page_tables", NULL); + if (!dir) return -ENOMEM;
+ pe = debugfs_create_file("kernel", 0400, dir, NULL, &ptdump_fops); + if (!pe) + goto err; return 0; +err: + debugfs_remove_recursive(dir); + return -ENOMEM; }
static void __exit pt_dump_debug_exit(void) { - debugfs_remove_recursive(pe); + debugfs_remove_recursive(dir); }
module_init(pt_dump_debug_init);
Patches currently in stable-queue which might be from bp@suse.de are
queue-4.14/x86-mm-pti-allow-nx-poison-to-be-set-in-p4d-pgd.patch queue-4.14/x86-mm-pti-force-entry-through-trampoline-when-pti-active.patch queue-4.14/x86-mm-pti-disable-global-pages-if-page_table_isolation-y.patch queue-4.14/x86-mm-pti-add-infrastructure-for-page-table-isolation.patch queue-4.14/x86-mm-pti-prepare-the-x86-entry-assembly-code-for-entry-exit-cr3-switching.patch queue-4.14/x86-pti-add-the-pti-cmdline-option-and-documentation.patch queue-4.14/x86-mm-pti-allocate-a-separate-user-pgd.patch queue-4.14/x86-mm-pti-populate-user-pgd.patch queue-4.14/x86-mm-dump_pagetables-add-page-table-directory-to-the-debugfs-vfs-hierarchy.patch