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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id k6-20020aa79d06000000b005379dd2deb5sm26442pfp.137.2022.09.01.13.57.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 01 Sep 2022 13:57:31 -0700 (PDT) From: Kees Cook To: Bradley Grove Cc: Kees Cook , "James E.J. Bottomley" , "Martin K. Petersen" , linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org Subject: [PATCH] esas2r: Use flex array destination for memcpy() Date: Thu, 1 Sep 2022 13:57:29 -0700 Message-Id: <20220901205729.2260982-1-keescook@chromium.org> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1755; h=from:subject; bh=oUzuUGbXdkp1+ygGE/o7VtLMEMLuK7W2INwNNN66ZAM=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBjERy4i+Rf8Ayy4CrbV48DD/6X4DpAkroVm50Cj5uh sv71xE2JAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCYxEcuAAKCRCJcvTf3G3AJpDzEA Cd8W1sY7X84DJ0FrmFfuLa+ZjlQQUatfnd7b0ruJ68IJaDPeOBHvXksHzTL/lgsx7soHMIkKWKCSPu RrqxHmvFixKDblA8BpS7hbIIJeegU7sBtdnAki9ia8p9FApIdmXhPFyMMz2fM4FA3CyZgfnRayc48+ 6Smxu+Q99NPoleFhpCsmXinnnJTDd503wTO4NiGpTbcDWrPYeJ5e0x8GnUEAVROhULxlkRlbxpHqI3 6gqMM5Ph1XMND9OCIXJfZcYeLz7SvsMGOEHRmd4w8IhVI//X9y58Q2Cbsx8mY+wIVUgqOCfp85Dg6G m7W2S5lHhnXDb05xNwS5YGl7mS8ThrQ7nJE7lD33AfHhJJlYYgJn2gNah6DT4106PKIO6UcZaVByJE 8PWIl91PWIQ4QNPUqv0n/mnp6B/NP/Mg74OSl2CY0WJaDtHATF/jd20/8QyF4XZB+LlN9ET110uehr lSz3IVpK9tAaZFo0fceOl5ugCL817Up04qN0w+QP5s+DwzvfW5Pg/VgtL2SRHh7vz6odv0UTLW/t5H EuKeL51g+Fr4i1v/AUseF/TmkBqIbnSbs1a9skbGAqagXtVVvITH51oRMKmQYiTe2fICbLIuMHoaw+ A4CNBWPQU66jahnexI3eWPFDQFN/axCMKgHgkMo7CDFwpzIFY1NwOe8EebMw== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org In preparation for FORTIFY_SOURCE performing run-time destination buffer bounds checking for memcpy(), specify the destination output buffer explicitly, instead of asking memcpy() to write past the end of what looked like a fixed-size object. Silences future run-time warning: memcpy: detected field-spanning write (size 80) of single field "trc + 1" (size 64) There is no binary code output differences from this change. Cc: Bradley Grove Cc: "James E.J. Bottomley" Cc: "Martin K. Petersen" Cc: linux-scsi@vger.kernel.org Signed-off-by: Kees Cook Reviewed-by: Gustavo A. R. Silva Reviewed-by: Gustavo A. R. Silva --- drivers/scsi/esas2r/atioctl.h | 1 + drivers/scsi/esas2r/esas2r_ioctl.c | 3 +-- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/scsi/esas2r/atioctl.h b/drivers/scsi/esas2r/atioctl.h index ff2ad9b38575..dd3437412ffc 100644 --- a/drivers/scsi/esas2r/atioctl.h +++ b/drivers/scsi/esas2r/atioctl.h @@ -831,6 +831,7 @@ struct __packed atto_hba_trace { u32 total_length; u32 trace_mask; u8 reserved2[48]; + u8 contents[]; }; #define ATTO_FUNC_SCSI_PASS_THRU 0x04 diff --git a/drivers/scsi/esas2r/esas2r_ioctl.c b/drivers/scsi/esas2r/esas2r_ioctl.c index 08f4e43c7d9e..e003d923acbf 100644 --- a/drivers/scsi/esas2r/esas2r_ioctl.c +++ b/drivers/scsi/esas2r/esas2r_ioctl.c @@ -947,10 +947,9 @@ static int hba_ioctl_callback(struct esas2r_adapter *a, break; } - memcpy(trc + 1, + memcpy(trc->contents, a->fw_coredump_buff + offset, len); - hi->data_length = len; } else if (trc->trace_func == ATTO_TRC_TF_RESET) { memset(a->fw_coredump_buff, 0,