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tracefs: Have new files inherit the ownership of their parent
commitee7f366699
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:4282d60689
("tracefs: Add new tracefs file system") Reported-by: Kalesh Singh <kaleshsingh@google.com> Reported: https://lore.kernel.org/all/CAC_TJve8MMAv+H_NdLSJXZUSoxOEq2zB_pVaJ9p=7H6Bu3X76g@mail.gmail.com/ Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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1 changed files with 4 additions and 0 deletions
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@ -409,6 +409,8 @@ struct dentry *tracefs_create_file(const char *name, umode_t mode,
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inode->i_mode = mode;
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inode->i_fop = fops ? fops : &tracefs_file_operations;
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inode->i_private = data;
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inode->i_uid = d_inode(dentry->d_parent)->i_uid;
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inode->i_gid = d_inode(dentry->d_parent)->i_gid;
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d_instantiate(dentry, inode);
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fsnotify_create(dentry->d_parent->d_inode, dentry);
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return end_creating(dentry);
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@ -431,6 +433,8 @@ static struct dentry *__create_dir(const char *name, struct dentry *parent,
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inode->i_mode = S_IFDIR | S_IRWXU | S_IRUSR| S_IRGRP | S_IXUSR | S_IXGRP;
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inode->i_op = ops;
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inode->i_fop = &simple_dir_operations;
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inode->i_uid = d_inode(dentry->d_parent)->i_uid;
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inode->i_gid = d_inode(dentry->d_parent)->i_gid;
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/* directory inodes start off with i_nlink == 2 (for "." entry) */
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inc_nlink(inode);
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