[PATCH] ext4 crypto: prevent mount when blocksize != pagesize
From: Seunghun Lee <hidden>
Date: 2015-06-11 15:31:13
Also in:
lkml
Subsystem:
ext4 file system, filesystems (vfs and infrastructure), the rest · Maintainers:
"Theodore Ts'o", Alexander Viro, Christian Brauner, Linus Torvalds
Encryption mode is unsupported when blocksize != pagesize. Signed-off-by: Seunghun Lee <redacted> --- fs/ext4/super.c | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 31e85be..032c9e3 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c@@ -1583,6 +1583,15 @@ static int handle_mount_opt(struct super_block *sb, char *opt, int token, IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg); } else if (token == Opt_test_dummy_encryption) { #ifdef CONFIG_EXT4_FS_ENCRYPTION + int blocksize = + BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size); + + if (blocksize != PAGE_CACHE_SIZE) { + ext4_msg(sb, KERN_ERR, + "unsupported blocksize for Test dummy encryption mode"); + return -1; + } + sbi->s_mount_flags |= EXT4_MF_TEST_DUMMY_ENCRYPTION; ext4_msg(sb, KERN_WARNING, "Test dummy encryption mode enabled");
--
2.3.5