Cherry-picking mainline commit 2f36db71009304b3f0b95afacd8eba1f9f046b87
introduces a regression in eCryptfs when mainline commit
6a480a7842545ec520a91730209ec0bae41694c1 (4.6+) is not present. The
regression causes all attempts at opening directory files to fail with
EMEDIUMTYPE when the lower filesystem's file_operations for directory
files do not implement mmap.
This is a simple fix that allows the check for the lower file's mmap
implementation to be ignored if the lower file is a directory.
Signed-off-by: Tyler Hicks <tyhicks@xxxxxxxxxxxxx>
Tested-by: Tyler Hicks <tyhicks@xxxxxxxxxxxxx> # 4.4.y, 3.18.y
Cc: <stable@xxxxxxxxxxxxxxx> # 4.5-
---
fs/ecryptfs/kthread.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/ecryptfs/kthread.c b/fs/ecryptfs/kthread.c
index e818f5a..b9faeab 100644
--- a/fs/ecryptfs/kthread.c
+++ b/fs/ecryptfs/kthread.c
@@ -171,7 +171,7 @@ int ecryptfs_privileged_open(struct file **lower_file,
goto out;
}
have_file:
- if ((*lower_file)->f_op->mmap == NULL) {
+ if ((*lower_file)->f_op->mmap == NULL && !d_is_dir(lower_dentry)) {
fput(*lower_file);
*lower_file = NULL;
rc = -EMEDIUMTYPE;
--
2.7.4
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