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authorEric Biggers <ebiggers@google.com>2016-09-08 14:20:38 -0700
committerTheodore Ts'o <tytso@mit.edu>2016-09-10 01:18:57 -0400
commitba63f23d69a3a10e7e527a02702023da68ef8a6d (patch)
treeef70ece0179f4d642e0b0b4d5f6aa6cfed7c9e74
parent002ced4be6429918800ce3e41d5cbc2d7c01822c (diff)
downloadlinux-stericsson-ba63f23d69a3a10e7e527a02702023da68ef8a6d.tar.gz
fscrypto: require write access to mount to set encryption policy
Since setting an encryption policy requires writing metadata to the filesystem, it should be guarded by mnt_want_write/mnt_drop_write. Otherwise, a user could cause a write to a frozen or readonly filesystem. This was handled correctly by f2fs but not by ext4. Make fscrypt_process_policy() handle it rather than relying on the filesystem to get it right. Signed-off-by: Eric Biggers <ebiggers@google.com> Cc: stable@vger.kernel.org # 4.1+; check fs/{ext4,f2fs} Signed-off-by: Theodore Ts'o <tytso@mit.edu> Acked-by: Jaegeuk Kim <jaegeuk@kernel.org>
-rw-r--r--fs/crypto/policy.c38
-rw-r--r--fs/ext4/ioctl.c2
-rw-r--r--fs/f2fs/file.c9
-rw-r--r--include/linux/fscrypto.h5
4 files changed, 29 insertions, 25 deletions
diff --git a/fs/crypto/policy.c b/fs/crypto/policy.c
index f96547f83cab..ed115acb5dee 100644
--- a/fs/crypto/policy.c
+++ b/fs/crypto/policy.c
@@ -11,6 +11,7 @@
#include <linux/random.h>
#include <linux/string.h>
#include <linux/fscrypto.h>
+#include <linux/mount.h>
static int inode_has_encryption_context(struct inode *inode)
{
@@ -92,31 +93,42 @@ static int create_encryption_context_from_policy(struct inode *inode,
return inode->i_sb->s_cop->set_context(inode, &ctx, sizeof(ctx), NULL);
}
-int fscrypt_process_policy(struct inode *inode,
+int fscrypt_process_policy(struct file *filp,
const struct fscrypt_policy *policy)
{
+ struct inode *inode = file_inode(filp);
+ int ret;
+
if (!inode_owner_or_capable(inode))
return -EACCES;
if (policy->version != 0)
return -EINVAL;
+ ret = mnt_want_write_file(filp);
+ if (ret)
+ return ret;
+
if (!inode_has_encryption_context(inode)) {
if (!S_ISDIR(inode->i_mode))
- return -EINVAL;
- if (!inode->i_sb->s_cop->empty_dir)
- return -EOPNOTSUPP;
- if (!inode->i_sb->s_cop->empty_dir(inode))
- return -ENOTEMPTY;
- return create_encryption_context_from_policy(inode, policy);
+ ret = -EINVAL;
+ else if (!inode->i_sb->s_cop->empty_dir)
+ ret = -EOPNOTSUPP;
+ else if (!inode->i_sb->s_cop->empty_dir(inode))
+ ret = -ENOTEMPTY;
+ else
+ ret = create_encryption_context_from_policy(inode,
+ policy);
+ } else if (!is_encryption_context_consistent_with_policy(inode,
+ policy)) {
+ printk(KERN_WARNING
+ "%s: Policy inconsistent with encryption context\n",
+ __func__);
+ ret = -EINVAL;
}
- if (is_encryption_context_consistent_with_policy(inode, policy))
- return 0;
-
- printk(KERN_WARNING "%s: Policy inconsistent with encryption context\n",
- __func__);
- return -EINVAL;
+ mnt_drop_write_file(filp);
+ return ret;
}
EXPORT_SYMBOL(fscrypt_process_policy);
diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index 10686fd67fb4..1bb7df5e4536 100644
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -776,7 +776,7 @@ resizefs_out:
(struct fscrypt_policy __user *)arg,
sizeof(policy)))
return -EFAULT;
- return fscrypt_process_policy(inode, &policy);
+ return fscrypt_process_policy(filp, &policy);
#else
return -EOPNOTSUPP;
#endif
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 47abb96098e4..28f4f4cbb8d8 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -1757,21 +1757,14 @@ static int f2fs_ioc_set_encryption_policy(struct file *filp, unsigned long arg)
{
struct fscrypt_policy policy;
struct inode *inode = file_inode(filp);
- int ret;
if (copy_from_user(&policy, (struct fscrypt_policy __user *)arg,
sizeof(policy)))
return -EFAULT;
- ret = mnt_want_write_file(filp);
- if (ret)
- return ret;
-
f2fs_update_time(F2FS_I_SB(inode), REQ_TIME);
- ret = fscrypt_process_policy(inode, &policy);
- mnt_drop_write_file(filp);
- return ret;
+ return fscrypt_process_policy(filp, &policy);
}
static int f2fs_ioc_get_encryption_policy(struct file *filp, unsigned long arg)
diff --git a/include/linux/fscrypto.h b/include/linux/fscrypto.h
index cfa6cde25f8e..76cff18bb032 100644
--- a/include/linux/fscrypto.h
+++ b/include/linux/fscrypto.h
@@ -274,8 +274,7 @@ extern void fscrypt_restore_control_page(struct page *);
extern int fscrypt_zeroout_range(struct inode *, pgoff_t, sector_t,
unsigned int);
/* policy.c */
-extern int fscrypt_process_policy(struct inode *,
- const struct fscrypt_policy *);
+extern int fscrypt_process_policy(struct file *, const struct fscrypt_policy *);
extern int fscrypt_get_policy(struct inode *, struct fscrypt_policy *);
extern int fscrypt_has_permitted_context(struct inode *, struct inode *);
extern int fscrypt_inherit_context(struct inode *, struct inode *,
@@ -345,7 +344,7 @@ static inline int fscrypt_notsupp_zeroout_range(struct inode *i, pgoff_t p,
}
/* policy.c */
-static inline int fscrypt_notsupp_process_policy(struct inode *i,
+static inline int fscrypt_notsupp_process_policy(struct file *f,
const struct fscrypt_policy *p)
{
return -EOPNOTSUPP;