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Message-Id: <20220924035226.3359297-1-keescook@chromium.org> Date: Fri, 23 Sep 2022 20:52:26 -0700 From: Kees Cook <keescook@...omium.org> To: Christine Caulfield <ccaulfie@...hat.com> Cc: Kees Cook <keescook@...omium.org>, David Teigland <teigland@...hat.com>, cluster-devel@...hat.com, "Gustavo A. R. Silva" <gustavoars@...nel.org>, linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org Subject: [PATCH] dlm: Split memcpy() of struct dlm_message flexible array To work around a misbehavior of the compiler's ability to see into composite flexible array structs (as detailed in the coming memcpy() hardening series[1]), split the memcpy() of the header and the payload so no false positive run-time overflow warning will be generated. [1] https://lore.kernel.org/linux-hardening/20220901065914.1417829-2-keescook@chromium.org/ Cc: Christine Caulfield <ccaulfie@...hat.com> Cc: David Teigland <teigland@...hat.com> Cc: cluster-devel@...hat.com Reported-by: "Gustavo A. R. Silva" <gustavoars@...nel.org> Signed-off-by: Kees Cook <keescook@...omium.org> --- fs/dlm/requestqueue.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/fs/dlm/requestqueue.c b/fs/dlm/requestqueue.c index 036a9a0078f6..63f45c3c53a2 100644 --- a/fs/dlm/requestqueue.c +++ b/fs/dlm/requestqueue.c @@ -44,7 +44,8 @@ void dlm_add_requestqueue(struct dlm_ls *ls, int nodeid, struct dlm_message *ms) e->recover_seq = ls->ls_recover_seq & 0xFFFFFFFF; e->nodeid = nodeid; - memcpy(&e->request, ms, le16_to_cpu(ms->m_header.h_length)); + e->request = *ms; + memcpy(&e->request.m_extra, ms->m_extra, length); atomic_inc(&ls->ls_requestqueue_cnt); mutex_lock(&ls->ls_requestqueue_mutex); -- 2.34.1
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