linux-ext4 - [PATCH 1/3] ext4 crypto: Return -EXDEV for link, rename, and cross-rename between incompat contexts

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Message-Id: <20170908001204.18174-2-mhalcrow@google.com>
Date:   Thu,  7 Sep 2017 17:12:02 -0700
From:   Michael Halcrow <mhalcrow@...gle.com>
To:     linux-fscrypt@...r.kernel.org
Cc:     linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
        tytso@....edu, linux-f2fs-devel@...ts.sourceforge.net,
        linux-mtd@...ts.infradead.org
Subject: [PATCH 1/3] ext4 crypto: Return -EXDEV for link, rename, and cross-rename between incompat contexts

Gives user space the opportunity to fall back to copy-and-delete.

Signed-off-by: Michael Halcrow <mhalcrow@...gle.com>
---
 fs/ext4/namei.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index c1cf020d1889..3c493bc4273d 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -3223,7 +3223,7 @@ static int ext4_link(struct dentry *old_dentry,
 		return -EMLINK;
 	if (ext4_encrypted_inode(dir) &&
 			!fscrypt_has_permitted_context(dir, inode))
-		return -EPERM;
+		return -EXDEV;
 
        if ((ext4_test_inode_flag(dir, EXT4_INODE_PROJINHERIT)) &&
 	   (!projid_eq(EXT4_I(dir)->i_projid,
@@ -3552,7 +3552,7 @@ static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry,
 	if ((old.dir != new.dir) &&
 	    ext4_encrypted_inode(new.dir) &&
 	    !fscrypt_has_permitted_context(new.dir, old.inode)) {
-		retval = -EPERM;
+		retval = -EXDEV;
 		goto end_rename;
 	}
 
@@ -3732,7 +3732,7 @@ static int ext4_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
 	    (old_dir != new_dir) &&
 	    (!fscrypt_has_permitted_context(new_dir, old.inode) ||
 	     !fscrypt_has_permitted_context(old_dir, new.inode)))
-		return -EPERM;
+		return -EXDEV;
 
 	if ((ext4_test_inode_flag(new_dir, EXT4_INODE_PROJINHERIT) &&
 	     !projid_eq(EXT4_I(new_dir)->i_projid,
-- 
2.14.1.581.gf28d330327-goog