Kees Cook 02f629bb46 smb3: Replace smb2pdu 1-element arrays with flex-arrays
commit eb3e28c1e89b4984308777231887e41aa8a0151f upstream.

The kernel is globally removing the ambiguous 0-length and 1-element
arrays in favor of flexible arrays, so that we can gain both compile-time
and run-time array bounds checking[1].

Replace the trailing 1-element array with a flexible array in the
following structures:

        struct smb2_err_rsp
        struct smb2_tree_connect_req
        struct smb2_negotiate_rsp
        struct smb2_sess_setup_req
        struct smb2_sess_setup_rsp
        struct smb2_read_req
        struct smb2_read_rsp
        struct smb2_write_req
        struct smb2_write_rsp
        struct smb2_query_directory_req
        struct smb2_query_directory_rsp
        struct smb2_set_info_req
        struct smb2_change_notify_rsp
        struct smb2_create_rsp
        struct smb2_query_info_req
        struct smb2_query_info_rsp

Replace the trailing 1-element array with a flexible array, but leave
the existing structure padding:

        struct smb2_file_all_info
        struct smb2_lock_req

Adjust all related size calculations to match the changes to sizeof().

No machine code output or .data section differences are produced after
these changes.

[1] For lots of details, see both:
    https://docs.kernel.org/process/deprecated.html#zero-length-and-one-element-arrays
    https://people.kernel.org/kees/bounded-flexible-arrays-in-c

Cc: Steve French <sfrench@samba.org>
Cc: Paulo Alcantara <pc@cjr.nz>
Cc: Ronnie Sahlberg <lsahlber@redhat.com>
Cc: Shyam Prasad N <sprasad@microsoft.com>
Cc: Tom Talpey <tom@talpey.com>
Cc: Namjae Jeon <linkinjeon@kernel.org>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: linux-cifs@vger.kernel.org
Cc: samba-technical@lists.samba.org
Reviewed-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Vasiliy Kovalev <kovalev@altlinux.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2024-02-23 08:41:55 +01:00
..
2020-10-22 12:17:52 -05:00
2020-06-01 00:10:18 -05:00
2020-11-15 23:05:33 -06:00
2023-01-14 10:16:25 +01:00
2023-01-14 10:16:25 +01:00
2020-06-01 00:10:18 -05:00
2023-01-14 10:16:34 +01:00
2021-01-19 18:27:19 +01:00
2021-09-08 08:49:01 +02:00
2020-10-22 12:16:24 -05:00
2024-01-05 15:12:29 +01:00
2020-08-02 18:00:25 -05:00
2023-03-22 13:30:03 +01:00
2023-12-08 08:46:15 +01:00