Needed to maintain Unix semantics (LTP testing). Signed-off-by: Erez Zadok <ezk@xxxxxxxxxxxxx> --- fs/unionfs/subr.c | 14 ++++++++++++++ 1 files changed, 14 insertions(+), 0 deletions(-) diff --git a/fs/unionfs/subr.c b/fs/unionfs/subr.c index 968ee8c..1a26c57 100644 --- a/fs/unionfs/subr.c +++ b/fs/unionfs/subr.c @@ -162,6 +162,19 @@ int make_dir_opaque(struct dentry *dentry, int bindex) struct dentry *lower_dentry, *diropq; struct inode *lower_dir; struct nameidata nd; + kernel_cap_t orig_cap; + + /* + * Opaque directory whiteout markers are special files (like regular + * whiteouts), and should appear to the users as if they don't + * exist. They should be created/deleted regardless of directory + * search/create permissions, but only for the duration of this + * creation of the .wh.__dir_opaque: file. Note, this does not + * circumvent normal ->permission). + */ + orig_cap = current->cap_effective; + cap_raise(current->cap_effective, CAP_DAC_READ_SEARCH); + cap_raise(current->cap_effective, CAP_DAC_OVERRIDE); lower_dentry = unionfs_lower_dentry_idx(dentry, bindex); lower_dir = lower_dentry->d_inode; @@ -189,6 +202,7 @@ int make_dir_opaque(struct dentry *dentry, int bindex) out: mutex_unlock(&lower_dir->i_mutex); + current->cap_effective = orig_cap; return err; } -- 1.5.2.2 - To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
