From ba679017ef0f47d31c50df731441fdd39bf4bf13 Mon Sep 17 00:00:00 2001 From: Eric Biggers Date: Thu, 1 Dec 2016 11:55:51 -0500 Subject: [PATCH] ext4: disable pwsalt ioctl when encryption disabled by config On a CONFIG_EXT4_FS_ENCRYPTION=n kernel, the ioctls to get and set encryption policies were disabled but EXT4_IOC_GET_ENCRYPTION_PWSALT was not. But there's no good reason to expose the pwsalt ioctl if the kernel doesn't support encryption. The pwsalt ioctl was also disabled pre-4.8 (via ext4_sb_has_crypto() previously returning 0 when encryption was disabled by config) and seems to have been enabled by mistake when ext4 encryption was refactored to use fs/crypto/. So let's disable it again. Signed-off-by: Eric Biggers Signed-off-by: Theodore Ts'o --- fs/ext4/ioctl.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c index 560afe08a5ca..fcc9510a819c 100644 --- a/fs/ext4/ioctl.c +++ b/fs/ext4/ioctl.c @@ -191,6 +191,7 @@ journal_err_out: return err; } +#ifdef CONFIG_EXT4_FS_ENCRYPTION static int uuid_is_zero(__u8 u[16]) { int i; @@ -200,6 +201,7 @@ static int uuid_is_zero(__u8 u[16]) return 0; return 1; } +#endif static int ext4_ioctl_setflags(struct inode *inode, unsigned int flags) @@ -802,6 +804,7 @@ resizefs_out: #endif } case EXT4_IOC_GET_ENCRYPTION_PWSALT: { +#ifdef CONFIG_EXT4_FS_ENCRYPTION int err, err2; struct ext4_sb_info *sbi = EXT4_SB(sb); handle_t *handle; @@ -836,6 +839,9 @@ resizefs_out: sbi->s_es->s_encrypt_pw_salt, 16)) return -EFAULT; return 0; +#else + return -EOPNOTSUPP; +#endif } case EXT4_IOC_GET_ENCRYPTION_POLICY: { #ifdef CONFIG_EXT4_FS_ENCRYPTION