diff options
| author | Kees Cook <keescook@chromium.org> | 2022-01-20 23:39:35 -0800 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2022-01-21 19:26:03 -0800 |
| commit | 63ec72bd58487935a2e40d2cdffe5c9498f1275e (patch) | |
| tree | 0256004a79e7cced0d929163f246f9943193d818 /net/mptcp | |
| parent | 2c13c05c5ff4b9fc907b07f7311821910ebaaf8a (diff) | |
mptcp: Use struct_group() to avoid cross-field memset()
In preparation for FORTIFY_SOURCE performing compile-time and run-time
field bounds checking for memcpy(), memmove(), and memset(), avoid
intentionally writing across neighboring fields.
Use struct_group() to capture the fields to be reset, so that memset()
can be appropriately bounds-checked by the compiler.
Cc: Matthieu Baerts <matthieu.baerts@tessares.net>
Cc: mptcp@lists.linux.dev
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Link: https://lore.kernel.org/r/20220121073935.1154263-1-keescook@chromium.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net/mptcp')
| -rw-r--r-- | net/mptcp/protocol.h | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/net/mptcp/protocol.h b/net/mptcp/protocol.h index 0e6b42c76ea0..85317ce38e3f 100644 --- a/net/mptcp/protocol.h +++ b/net/mptcp/protocol.h @@ -408,7 +408,7 @@ DECLARE_PER_CPU(struct mptcp_delegated_action, mptcp_delegated_actions); struct mptcp_subflow_context { struct list_head node;/* conn_list of subflows */ - char reset_start[0]; + struct_group(reset, unsigned long avg_pacing_rate; /* protected by msk socket lock */ u64 local_key; @@ -458,7 +458,7 @@ struct mptcp_subflow_context { long delegated_status; - char reset_end[0]; + ); struct list_head delegated_node; /* link into delegated_action, protected by local BH */ @@ -494,7 +494,7 @@ mptcp_subflow_tcp_sock(const struct mptcp_subflow_context *subflow) static inline void mptcp_subflow_ctx_reset(struct mptcp_subflow_context *subflow) { - memset(subflow->reset_start, 0, subflow->reset_end - subflow->reset_start); + memset(&subflow->reset, 0, sizeof(subflow->reset)); subflow->request_mptcp = 1; } |