Needed to maintain Unix semantics (LTP testing).
Signed-off-by: Erez Zadok <[email protected]>
---
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
-
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