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Message-Id: <20220901205729.2260982-1-keescook@chromium.org> Date: Thu, 1 Sep 2022 13:57:29 -0700 From: Kees Cook <keescook@...omium.org> To: Bradley Grove <linuxdrivers@...otech.com> Cc: Kees Cook <keescook@...omium.org>, "James E.J. Bottomley" <jejb@...ux.ibm.com>, "Martin K. Petersen" <martin.petersen@...cle.com>, linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org Subject: [PATCH] esas2r: Use flex array destination for memcpy() 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 <linuxdrivers@...otech.com> Cc: "James E.J. Bottomley" <jejb@...ux.ibm.com> Cc: "Martin K. Petersen" <martin.petersen@...cle.com> Cc: linux-scsi@...r.kernel.org Signed-off-by: Kees Cook <keescook@...omium.org> --- 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, -- 2.34.1
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