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Message-Id: <20200423200316.164518-3-gladkov.alexey@gmail.com>
Date: Thu, 23 Apr 2020 22:03:10 +0200
From: Alexey Gladkov <gladkov.alexey@...il.com>
To: LKML <linux-kernel@...r.kernel.org>
Cc: Kernel Hardening <kernel-hardening@...ts.openwall.com>,
Linux API <linux-api@...r.kernel.org>,
Linux FS Devel <linux-fsdevel@...r.kernel.org>,
Linux Security Module <linux-security-module@...r.kernel.org>,
Akinobu Mita <akinobu.mita@...il.com>,
Alexander Viro <viro@...iv.linux.org.uk>,
Alexey Dobriyan <adobriyan@...il.com>,
Alexey Gladkov <legion@...nel.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Andy Lutomirski <luto@...nel.org>,
Daniel Micay <danielmicay@...il.com>,
Djalal Harouni <tixxdz@...il.com>,
"Dmitry V . Levin" <ldv@...linux.org>,
"Eric W . Biederman" <ebiederm@...ssion.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Ingo Molnar <mingo@...nel.org>,
"J . Bruce Fields" <bfields@...ldses.org>,
Jeff Layton <jlayton@...chiereds.net>,
Jonathan Corbet <corbet@....net>,
Kees Cook <keescook@...omium.org>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Oleg Nesterov <oleg@...hat.com>,
David Howells <dhowells@...hat.com>
Subject: [PATCH v13 2/8] Use proc_pid_ns() to get pid_namespace from the proc superblock
To get pid_namespace from the procfs superblock should be used a special
helper. This will avoid errors when s_fs_info will change the type.
Signed-off-by: Alexey Gladkov <gladkov.alexey@...il.com>
---
fs/locks.c | 4 ++--
security/tomoyo/realpath.c | 4 +++-
2 files changed, 5 insertions(+), 3 deletions(-)
diff --git a/fs/locks.c b/fs/locks.c
index b8a31c1c4fff..399c5dbb72c4 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -2823,7 +2823,7 @@ static void lock_get_status(struct seq_file *f, struct file_lock *fl,
{
struct inode *inode = NULL;
unsigned int fl_pid;
- struct pid_namespace *proc_pidns = file_inode(f->file)->i_sb->s_fs_info;
+ struct pid_namespace *proc_pidns = proc_pid_ns(file_inode(f->file));
fl_pid = locks_translate_pid(fl, proc_pidns);
/*
@@ -2901,7 +2901,7 @@ static int locks_show(struct seq_file *f, void *v)
{
struct locks_iterator *iter = f->private;
struct file_lock *fl, *bfl;
- struct pid_namespace *proc_pidns = file_inode(f->file)->i_sb->s_fs_info;
+ struct pid_namespace *proc_pidns = proc_pid_ns(file_inode(f->file));
fl = hlist_entry(v, struct file_lock, fl_link);
diff --git a/security/tomoyo/realpath.c b/security/tomoyo/realpath.c
index bf38fc1b59b2..08b096e2f7e3 100644
--- a/security/tomoyo/realpath.c
+++ b/security/tomoyo/realpath.c
@@ -7,6 +7,7 @@
#include "common.h"
#include <linux/magic.h>
+#include <linux/proc_fs.h>
/**
* tomoyo_encode2 - Encode binary string to ascii string.
@@ -161,9 +162,10 @@ static char *tomoyo_get_local_path(struct dentry *dentry, char * const buffer,
if (sb->s_magic == PROC_SUPER_MAGIC && *pos == '/') {
char *ep;
const pid_t pid = (pid_t) simple_strtoul(pos + 1, &ep, 10);
+ struct pid_namespace *proc_pidns = proc_pid_ns(d_inode(dentry));
if (*ep == '/' && pid && pid ==
- task_tgid_nr_ns(current, sb->s_fs_info)) {
+ task_tgid_nr_ns(current, proc_pidns)) {
pos = ep - 5;
if (pos < buffer)
goto out;
--
2.25.3
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