diff options
| author | Al Viro <viro@zeniv.linux.org.uk> | 2023-09-20 00:12:00 -0400 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2024-02-25 02:10:32 -0500 |
| commit | e31f0a57ae1ab2f6e17adb8e602bc120ad722232 (patch) | |
| tree | 7b8fa35282a310a6ead52901ede07fdbabc01723 | |
| parent | 47458802f6606f652cd0f6dc38cd52ce60ec0145 (diff) | |
procfs: make freeing proc_fs_info rcu-delayed
makes proc_pid_ns() safe from rcu pathwalk (put_pid_ns()
is still synchronous, but that's not a problem - it does
rcu-delay everything that needs to be)
Reviewed-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| -rw-r--r-- | fs/proc/root.c | 2 | ||||
| -rw-r--r-- | include/linux/proc_fs.h | 1 |
2 files changed, 2 insertions, 1 deletions
diff --git a/fs/proc/root.c b/fs/proc/root.c index b55dbc70287b..06a297a27ba3 100644 --- a/fs/proc/root.c +++ b/fs/proc/root.c @@ -271,7 +271,7 @@ static void proc_kill_sb(struct super_block *sb) kill_anon_super(sb); put_pid_ns(fs_info->pid_ns); - kfree(fs_info); + kfree_rcu(fs_info, rcu); } static struct file_system_type proc_fs_type = { diff --git a/include/linux/proc_fs.h b/include/linux/proc_fs.h index de407e7c3b55..0b2a89854440 100644 --- a/include/linux/proc_fs.h +++ b/include/linux/proc_fs.h @@ -65,6 +65,7 @@ struct proc_fs_info { kgid_t pid_gid; enum proc_hidepid hide_pid; enum proc_pidonly pidonly; + struct rcu_head rcu; }; static inline struct proc_fs_info *proc_sb_info(struct super_block *sb) |