Hello Andy,
in the code of your patch "mpc85xx: Add support for the Varisys Cyrus
board" merged in 2015 as 87e29878cab an out of bound access occurs. See
below.
On 11/4/15 10:48 PM, Andy Fleming wrote:
This board runs a P5020 or P5040 chip, and utilizes
an EEPROM with similar formatting to the Freescale P5020DS.
Large amounts of this code were developed by
Adrian Cox <adrian at humboldt dot co dot uk>
Signed-off-by: Andy Fleming <[email protected]>
Reviewed-by: York Sun <[email protected]>
---
<snip />
> +++ b/board/varisys/common/sys_eeprom.c
<snip />
> +static struct __attribute__ ((__packed__)) eeprom {
> + u8 id[4]; /* 0x00 - 0x03 EEPROM Tag 'NXID' */
> + u8 sn[12]; /* 0x04 - 0x0F Serial Number */
> + u8 errata[5]; /* 0x10 - 0x14 Errata Level */
> + u8 date[6]; /* 0x15 - 0x1a Build Date */
> + u8 res_0; /* 0x1b Reserved */
> + u32 version; /* 0x1c - 0x1f NXID Version */
> + u8 tempcal[8]; /* 0x20 - 0x27 Temperature Calibration Factors */
> + u8 tempcalsys[2]; /* 0x28 - 0x29 System Temperature Calibration
Factors */
> + u8 tempcalflags; /* 0x2a Temperature Calibration Flags */
> + u8 res_1[21]; /* 0x2b - 0x3f Reserved */
> + u8 mac_count; /* 0x40 Number of MAC addresses */
> + u8 mac_flag; /* 0x41 MAC table flags */
> + u8 mac[MAX_NUM_PORTS][6]; /* 0x42 - x MAC addresses */
> + u32 crc; /* x+1 CRC32 checksum */
> +} e;
<snip /> // MAX_NUM_PORTS = 8
+int mac_read_from_eeprom_common(void)
+{
+ unsigned int i;
+ u32 crc, crc_offset = offsetof(struct eeprom, crc);
+ u32 *crcp; /* Pointer to the CRC in the data read from the EEPROM */
+
+ puts("EEPROM: ");
+
+ if (read_eeprom()) {
+ printf("Read failed.\n");
+ return 0;
+ }
+
+ if (!is_valid) {
+ printf("Invalid ID (%02x %02x %02x %02x)\n",
+ e.id[0], e.id[1], e.id[2], e.id[3]);
+ return 0;
+ }
+
+ crc = crc32(0, (void *)&e, crc_offset);
+ crcp = (void *)&e + crc_offset;
+ if (crc != be32_to_cpu(*crcp)) {
+ printf("CRC mismatch (%08x != %08x)\n", crc,
+ be32_to_cpu(e.crc));
+ return 0;
+ }
+
+ /*
+ * MAC address #9 in v1 occupies the same position as the CRC in v0.
+ * Erase it so that it's not mistaken for a MAC address. We'll
+ * update the CRC later.
+ */
+ if (e.version == 0)
+ memset(e.mac[8], 0xff, 6);
Here you are writing 2 bytes beyond the size of e.
Best regards
Heinrich
