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mm/swap: reject swapon() on filesystem-level encrypted files

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commit c310a8932a upstream.

ext4 and f2fs don't prevent filesystem-level encrypted files from being
set up directly as swap files.  In this case, encryption is bypassed.

No one should be doing this, vs.  the methods of encrypted swap that
actually do work (such as swapping to a dm-crypt device, or swapping to a
loopback device on top of a filesystem-level encrypted file).

Nevertheless, to prevent user error, make swapon() explicitly reject this
case.  Document this behavior in fscrypt.rst as well.

Link: https://lore.kernel.org/20260803180426.3123-1-ebiggers@kernel.org
Fixes: 9bd8212f98 ("ext4 crypto: add encryption policy and password salt support")
Fixes: f424f664f0 ("f2fs crypto: add encryption policy and password salt support")
Signed-off-by: Eric Biggers <ebiggers@kernel.org>
Reviewed-by: Baoquan He <baoquan.he@linux.dev>
Reviewed-by: Muhammad Usama Anjum <usama.anjum@arm.com>
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
Cc: Barry Song <baohua@kernel.org>
Cc: Chris Li <chrisl@kernel.org>
Cc: Kairui Song <kasong@tencent.com>
Cc: Kemeng Shi <shikemeng@huaweicloud.com>
Cc: Nhat Pham <nphamcs@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Eric Biggers
2026-09-02 14:29:20 +02:00
committed by Greg Kroah-Hartman
parent f52f1e7571
commit da45847766
2 changed files with 11 additions and 0 deletions
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Documentation/filesystems/fscrypt.rst
+4
View File
@@ -1158,6 +1158,10 @@ astute users may notice some differences in behavior:
- DAX (Direct Access) is not supported on encrypted files.
- Encrypted files cannot be used directly as swap files. To swap to
an encrypted file, set up a loopback device on top of it.
Alternatively, encrypted swap can use a dm-crypt device.
- The maximum length of an encrypted symlink is 2 bytes shorter than
the maximum length of an unencrypted symlink. For example, on an
EXT4 filesystem with a 4K block size, unencrypted symlinks can be up
mm/swapfile.c
+7
View File
@@ -3051,6 +3051,13 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags)
error = -EBUSY;
goto bad_swap_unlock_inode;
}
if (IS_ENCRYPTED(inode)) {
pr_warn_once(
"Filesystem-level encrypted swapfile '%s' is unsupported. Create a loop device over it, or use dm-crypt\n",
name->name);
error = -EINVAL;
goto bad_swap_unlock_inode;
}
/*
* Read the swap header.