This is a note to let you know that I've just added the patch titled
f2fs: report correct st_size for encrypted symlinks
to the 5.13-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
f2fs-report-correct-st_size-for-encrypted-symlinks.patch
and it can be found in the queue-5.13 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 461b43a8f92e68e96c4424b31e15f2b35f1bbfa9 Mon Sep 17 00:00:00 2001
From: Eric Biggers <ebiggers@xxxxxxxxxx>
Date: Thu, 1 Jul 2021 23:53:48 -0700
Subject: f2fs: report correct st_size for encrypted symlinks
From: Eric Biggers <ebiggers@xxxxxxxxxx>
commit 461b43a8f92e68e96c4424b31e15f2b35f1bbfa9 upstream.
The stat() family of syscalls report the wrong size for encrypted
symlinks, which has caused breakage in several userspace programs.
Fix this by calling fscrypt_symlink_getattr() after f2fs_getattr() for
encrypted symlinks. This function computes the correct size by reading
and decrypting the symlink target (if it's not already cached).
For more details, see the commit which added fscrypt_symlink_getattr().
Fixes: cbaf042a3cc6 ("f2fs crypto: add symlink encryption")
Cc: stable@xxxxxxxxxxxxxxx
Link: https://lore.kernel.org/r/20210702065350.209646-4-ebiggers@xxxxxxxxxx
Signed-off-by: Eric Biggers <ebiggers@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/f2fs/namei.c | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)
--- a/fs/f2fs/namei.c
+++ b/fs/f2fs/namei.c
@@ -1313,9 +1313,19 @@ static const char *f2fs_encrypted_get_li
return target;
}
+static int f2fs_encrypted_symlink_getattr(struct user_namespace *mnt_userns,
+ const struct path *path,
+ struct kstat *stat, u32 request_mask,
+ unsigned int query_flags)
+{
+ f2fs_getattr(mnt_userns, path, stat, request_mask, query_flags);
+
+ return fscrypt_symlink_getattr(path, stat);
+}
+
const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
.get_link = f2fs_encrypted_get_link,
- .getattr = f2fs_getattr,
+ .getattr = f2fs_encrypted_symlink_getattr,
.setattr = f2fs_setattr,
.listxattr = f2fs_listxattr,
};
Patches currently in stable-queue which might be from ebiggers@xxxxxxxxxx are
queue-5.13/ubifs-report-correct-st_size-for-encrypted-symlinks.patch
queue-5.13/ext4-report-correct-st_size-for-encrypted-symlinks.patch
queue-5.13/fscrypt-add-fscrypt_symlink_getattr-for-computing-st_size.patch
queue-5.13/f2fs-report-correct-st_size-for-encrypted-symlinks.patch
