f2fs: report correct st_size for encrypted symlinks
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@vger.kernel.org Link: https://lore.kernel.org/r/20210702065350.209646-4-ebiggers@kernel.org Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -1256,9 +1256,18 @@ static const char *f2fs_encrypted_get_link(struct dentry *dentry,
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return target;
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}
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static int f2fs_encrypted_symlink_getattr(const struct path *path,
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struct kstat *stat, u32 request_mask,
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unsigned int query_flags)
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{
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f2fs_getattr(path, stat, request_mask, query_flags);
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return fscrypt_symlink_getattr(path, stat);
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}
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const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
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.get_link = f2fs_encrypted_get_link,
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.getattr = f2fs_getattr,
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.getattr = f2fs_encrypted_symlink_getattr,
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.setattr = f2fs_setattr,
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#ifdef CONFIG_F2FS_FS_XATTR
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.listxattr = f2fs_listxattr,
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