From d4894f3ea7375dd9492b5d3d2ecb0b6e4bdb604e Mon Sep 17 00:00:00 2001 From: Matt Carlson Date: Wed, 9 Mar 2011 16:58:21 +0000 Subject: [PATCH] tg3: Add code to verify RODATA checksum of VPD This patch adds code to verify the checksum stored in the "RV" info keyword of the RODATA VPD section. Signed-off-by: Matt Carlson Reviewed-by: Michael Chan Signed-off-by: David S. Miller --- drivers/net/tg3.c | 35 +++++++++++++++++++++++++++++++++++ include/linux/pci.h | 1 + 2 files changed, 36 insertions(+) diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c index 8f7160812e06..ffb09795101e 100644 --- a/drivers/net/tg3.c +++ b/drivers/net/tg3.c @@ -10499,6 +10499,41 @@ static int tg3_test_nvram(struct tg3 *tp) if (csum != le32_to_cpu(buf[0xfc/4])) goto out; + for (i = 0; i < TG3_NVM_VPD_LEN; i += 4) { + /* The data is in little-endian format in NVRAM. + * Use the big-endian read routines to preserve + * the byte order as it exists in NVRAM. + */ + if (tg3_nvram_read_be32(tp, TG3_NVM_VPD_OFF + i, &buf[i/4])) + goto out; + } + + i = pci_vpd_find_tag((u8 *)buf, 0, TG3_NVM_VPD_LEN, + PCI_VPD_LRDT_RO_DATA); + if (i > 0) { + j = pci_vpd_lrdt_size(&((u8 *)buf)[i]); + if (j < 0) + goto out; + + if (i + PCI_VPD_LRDT_TAG_SIZE + j > TG3_NVM_VPD_LEN) + goto out; + + i += PCI_VPD_LRDT_TAG_SIZE; + j = pci_vpd_find_info_keyword((u8 *)buf, i, j, + PCI_VPD_RO_KEYWORD_CHKSUM); + if (j > 0) { + u8 csum8 = 0; + + j += PCI_VPD_INFO_FLD_HDR_SIZE; + + for (i = 0; i <= j; i++) + csum8 += ((u8 *)buf)[i]; + + if (csum8) + goto out; + } + } + err = 0; out: diff --git a/include/linux/pci.h b/include/linux/pci.h index 559d02897075..ff5bccb87136 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -1479,6 +1479,7 @@ void pci_request_acs(void); #define PCI_VPD_RO_KEYWORD_PARTNO "PN" #define PCI_VPD_RO_KEYWORD_MFR_ID "MN" #define PCI_VPD_RO_KEYWORD_VENDOR0 "V0" +#define PCI_VPD_RO_KEYWORD_CHKSUM "RV" /** * pci_vpd_lrdt_size - Extracts the Large Resource Data Type length -- 2.20.1