From 42c335f7e67029d2e01711f2f2bc6252277c8993 Mon Sep 17 00:00:00 2001 From: Kees Cook Date: Tue, 9 May 2017 15:34:44 -0700 Subject: [PATCH] scsi: csiostor: Avoid content leaks and casts When copying attributes, the len argument was padded out and the resulting memcpy() would copy beyond the end of the source buffer. Avoid this, and use size_t for val_len to avoid all the casts. Similarly, avoid source buffer casts and use void *. Additionally enforces val_len can be represented by u16 and that the DMA buffer was not overflowed. Fixes the size of mfa, which is not FC_FDMI_PORT_ATTR_MAXFRAMESIZE_LEN (but it will be padded up to 4). This was noticed by the future CONFIG_FORTIFY_SOURCE checks. Cc: Daniel Micay Signed-off-by: Kees Cook Acked-by: Varun Prakash Signed-off-by: Martin K. Petersen --- drivers/scsi/csiostor/csio_lnode.c | 43 +++++++++++++++++++++++--------------- 1 file changed, 26 insertions(+), 17 deletions(-) diff --git a/drivers/scsi/csiostor/csio_lnode.c b/drivers/scsi/csiostor/csio_lnode.c index c00b2ff..be5ee2d 100644 --- a/drivers/scsi/csiostor/csio_lnode.c +++ b/drivers/scsi/csiostor/csio_lnode.c @@ -238,14 +238,23 @@ csio_osname(uint8_t *buf, size_t buf_len) } static inline void -csio_append_attrib(uint8_t **ptr, uint16_t type, uint8_t *val, uint16_t len) +csio_append_attrib(uint8_t **ptr, uint16_t type, void *val, size_t val_len) { + uint16_t len; struct fc_fdmi_attr_entry *ae = (struct fc_fdmi_attr_entry *)*ptr; + + if (WARN_ON(val_len > U16_MAX)) + return; + + len = val_len; + ae->type = htons(type); len += 4; /* includes attribute type and length */ len = (len + 3) & ~3; /* should be multiple of 4 bytes */ ae->len = htons(len); - memcpy(ae->value, val, len); + memcpy(ae->value, val, val_len); + if (len > val_len) + memset(ae->value + val_len, 0, len - val_len); *ptr += len; } @@ -335,7 +344,7 @@ csio_ln_fdmi_rhba_cbfn(struct csio_hw *hw, struct csio_ioreq *fdmi_req) numattrs++; val = htonl(FC_PORTSPEED_1GBIT | FC_PORTSPEED_10GBIT); csio_append_attrib(&pld, FC_FDMI_PORT_ATTR_SUPPORTEDSPEED, - (uint8_t *)&val, + &val, FC_FDMI_PORT_ATTR_SUPPORTEDSPEED_LEN); numattrs++; @@ -346,23 +355,22 @@ csio_ln_fdmi_rhba_cbfn(struct csio_hw *hw, struct csio_ioreq *fdmi_req) else val = htonl(CSIO_HBA_PORTSPEED_UNKNOWN); csio_append_attrib(&pld, FC_FDMI_PORT_ATTR_CURRENTPORTSPEED, - (uint8_t *)&val, - FC_FDMI_PORT_ATTR_CURRENTPORTSPEED_LEN); + &val, FC_FDMI_PORT_ATTR_CURRENTPORTSPEED_LEN); numattrs++; mfs = ln->ln_sparm.csp.sp_bb_data; csio_append_attrib(&pld, FC_FDMI_PORT_ATTR_MAXFRAMESIZE, - (uint8_t *)&mfs, FC_FDMI_PORT_ATTR_MAXFRAMESIZE_LEN); + &mfs, sizeof(mfs)); numattrs++; strcpy(buf, "csiostor"); csio_append_attrib(&pld, FC_FDMI_PORT_ATTR_OSDEVICENAME, buf, - (uint16_t)strlen(buf)); + strlen(buf)); numattrs++; if (!csio_hostname(buf, sizeof(buf))) { csio_append_attrib(&pld, FC_FDMI_PORT_ATTR_HOSTNAME, - buf, (uint16_t)strlen(buf)); + buf, strlen(buf)); numattrs++; } attrib_blk->numattrs = htonl(numattrs); @@ -444,33 +452,32 @@ csio_ln_fdmi_dprt_cbfn(struct csio_hw *hw, struct csio_ioreq *fdmi_req) strcpy(buf, "Chelsio Communications"); csio_append_attrib(&pld, FC_FDMI_HBA_ATTR_MANUFACTURER, buf, - (uint16_t)strlen(buf)); + strlen(buf)); numattrs++; csio_append_attrib(&pld, FC_FDMI_HBA_ATTR_SERIALNUMBER, - hw->vpd.sn, (uint16_t)sizeof(hw->vpd.sn)); + hw->vpd.sn, sizeof(hw->vpd.sn)); numattrs++; csio_append_attrib(&pld, FC_FDMI_HBA_ATTR_MODEL, hw->vpd.id, - (uint16_t)sizeof(hw->vpd.id)); + sizeof(hw->vpd.id)); numattrs++; csio_append_attrib(&pld, FC_FDMI_HBA_ATTR_MODELDESCRIPTION, - hw->model_desc, (uint16_t)strlen(hw->model_desc)); + hw->model_desc, strlen(hw->model_desc)); numattrs++; csio_append_attrib(&pld, FC_FDMI_HBA_ATTR_HARDWAREVERSION, - hw->hw_ver, (uint16_t)sizeof(hw->hw_ver)); + hw->hw_ver, sizeof(hw->hw_ver)); numattrs++; csio_append_attrib(&pld, FC_FDMI_HBA_ATTR_FIRMWAREVERSION, - hw->fwrev_str, (uint16_t)strlen(hw->fwrev_str)); + hw->fwrev_str, strlen(hw->fwrev_str)); numattrs++; if (!csio_osname(buf, sizeof(buf))) { csio_append_attrib(&pld, FC_FDMI_HBA_ATTR_OSNAMEVERSION, - buf, (uint16_t)strlen(buf)); + buf, strlen(buf)); numattrs++; } csio_append_attrib(&pld, FC_FDMI_HBA_ATTR_MAXCTPAYLOAD, - (uint8_t *)&maxpayload, - FC_FDMI_HBA_ATTR_MAXCTPAYLOAD_LEN); + &maxpayload, FC_FDMI_HBA_ATTR_MAXCTPAYLOAD_LEN); len = (uint32_t)(pld - (uint8_t *)cmd); numattrs++; attrib_blk->numattrs = htonl(numattrs); @@ -1794,6 +1801,8 @@ csio_ln_mgmt_submit_req(struct csio_ioreq *io_req, struct csio_mgmtm *mgmtm = csio_hw_to_mgmtm(hw); int rv; + BUG_ON(pld_len > pld->len); + io_req->io_cbfn = io_cbfn; /* Upper layer callback handler */ io_req->fw_handle = (uintptr_t) (io_req); io_req->eq_idx = mgmtm->eq_idx; -- 2.7.4