From: "Steven Rostedt (VMware)" rostedt@goodmis.org
stable inclusion from stable-v5.10.85 commit 33204825cc2b0f3184ef6bc8426a973a30566578 bugzilla: 186032 https://gitee.com/openeuler/kernel/issues/I4QVI4
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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commit ee7f3666995d8537dec17b1d35425f28877671a9 upstream.
If directories in tracefs have their ownership changed, then any new files and directories that are created under those directories should inherit the ownership of the director they are created in.
Link: https://lkml.kernel.org/r/20211208075720.4855d180@gandalf.local.home
Cc: Kees Cook keescook@chromium.org Cc: Ingo Molnar mingo@kernel.org Cc: Andrew Morton akpm@linux-foundation.org Cc: Linus Torvalds torvalds@linux-foundation.org Cc: Al Viro viro@zeniv.linux.org.uk Cc: Greg Kroah-Hartman gregkh@linuxfoundation.org Cc: Yabin Cui yabinc@google.com Cc: Christian Brauner christian.brauner@ubuntu.com Cc: stable@vger.kernel.org Fixes: 4282d60689d4f ("tracefs: Add new tracefs file system") Reported-by: Kalesh Singh kaleshsingh@google.com Reported: https://lore.kernel.org/all/CAC_TJve8MMAv+H_NdLSJXZUSoxOEq2zB_pVaJ9p=7H6Bu3X... Signed-off-by: Steven Rostedt (VMware) rostedt@goodmis.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Chen Jun chenjun102@huawei.com Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com --- fs/tracefs/inode.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/fs/tracefs/inode.c b/fs/tracefs/inode.c index bf58ae6f984f..3d7bb4c8c261 100644 --- a/fs/tracefs/inode.c +++ b/fs/tracefs/inode.c @@ -412,6 +412,8 @@ struct dentry *tracefs_create_file(const char *name, umode_t mode, inode->i_mode = mode; inode->i_fop = fops ? fops : &tracefs_file_operations; inode->i_private = data; + inode->i_uid = d_inode(dentry->d_parent)->i_uid; + inode->i_gid = d_inode(dentry->d_parent)->i_gid; d_instantiate(dentry, inode); fsnotify_create(dentry->d_parent->d_inode, dentry); return end_creating(dentry); @@ -434,6 +436,8 @@ static struct dentry *__create_dir(const char *name, struct dentry *parent, inode->i_mode = S_IFDIR | S_IRWXU | S_IRUSR| S_IRGRP | S_IXUSR | S_IXGRP; inode->i_op = ops; inode->i_fop = &simple_dir_operations; + inode->i_uid = d_inode(dentry->d_parent)->i_uid; + inode->i_gid = d_inode(dentry->d_parent)->i_gid;
/* directory inodes start off with i_nlink == 2 (for "." entry) */ inc_nlink(inode);