From 358fcf5ddbec4e6706405847d6a666f5933a6c25 Mon Sep 17 00:00:00 2001 From: Michal Suchanek Date: Tue, 4 Jan 2022 18:05:05 +0100 Subject: debugfs: lockdown: Allow reading debugfs files that are not world readable When the kernel is locked down the kernel allows reading only debugfs files with mode 444. Mode 400 is also valid but is not allowed. Make the 444 into a mask. Fixes: 5496197f9b08 ("debugfs: Restrict debugfs when the kernel is locked down") Signed-off-by: Michal Suchanek Link: https://lore.kernel.org/r/20220104170505.10248-1-msuchanek@suse.de Signed-off-by: Greg Kroah-Hartman --- fs/debugfs/file.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'fs/debugfs') diff --git a/fs/debugfs/file.c b/fs/debugfs/file.c index 7d162b0efbf0..950c63fa4d0b 100644 --- a/fs/debugfs/file.c +++ b/fs/debugfs/file.c @@ -147,7 +147,7 @@ static int debugfs_locked_down(struct inode *inode, struct file *filp, const struct file_operations *real_fops) { - if ((inode->i_mode & 07777) == 0444 && + if ((inode->i_mode & 07777 & ~0444) == 0 && !(filp->f_mode & FMODE_WRITE) && !real_fops->unlocked_ioctl && !real_fops->compat_ioctl && -- cgit v1.2.3