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scsi: ipr: Work around fortify-string warning 

The ipr_log_vpd_compact() function triggers a fortified memcpy() warning
about a potential string overflow with all versions of clang:

In file included from drivers/scsi/ipr.c:43:
In file included from include/linux/string.h:254:
include/linux/fortify-string.h:520:4: error: call to '__write_overflow_field' declared with 'warning' attribute: detected write beyond size of field (1st parameter); maybe use struct_group()? [-Werror,-Wattribute-warning]
                        __write_overflow_field(p_size_field, size);
                        ^
include/linux/fortify-string.h:520:4: error: call to '__write_overflow_field' declared with 'warning' attribute: detected write beyond size of field (1st parameter); maybe use struct_group()? [-Werror,-Wattribute-warning]
2 errors generated.

I don't see anything actually wrong with the function, but this is the only
instance I can reproduce of the fortification going wrong in the kernel at
the moment, so the easiest solution may be to rewrite the function into
something that does not trigger the warning.

Instead of having a combined buffer for vendor/device/serial strings, use
three separate local variables and just truncate the whitespace
individually.

Link: https://lore.kernel.org/r/20230214132831.2118392-1-arnd@kernel.org
Cc: Kees Cook <keescook@chromium.org>
Fixes: 8cf093e275 ("[SCSI] ipr: Improved dual adapter errors")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Acked-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Arnd Bergmann 2023-02-14 14:28:08 +01:00 committed by Martin K. Petersen
parent 3a2d1efaf3
commit ee4e7dfe4f
1 changed files with 21 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

39
drivers/scsi/ipr.c
View File

@ -1516,23 +1516,22 @@ static void ipr_process_ccn(struct ipr_cmnd *ipr_cmd)
}
/**
* strip_and_pad_whitespace - Strip and pad trailing whitespace.
* @i: index into buffer
* strip_whitespace - Strip and pad trailing whitespace.
* @i: size of buffer
* @buf: string to modify
*
* This function will strip all trailing whitespace, pad the end
* of the string with a single space, and NULL terminate the string.
* This function will strip all trailing whitespace and
* NUL terminate the string.
*
* Return value:
* new length of string
**/
static int strip_and_pad_whitespace(int i, char *buf)
static void strip_whitespace(int i, char *buf)
{
if (i < 1)
return;
i--;
while (i && buf[i] == ' ')
i--;
buf[i+1] = ' ';
buf[i+2] = '\0';
return i + 2;
buf[i+1] = '\0';
}
/**
@ -1547,19 +1546,21 @@ static int strip_and_pad_whitespace(int i, char *buf)
static void ipr_log_vpd_compact(char *prefix, struct ipr_hostrcb *hostrcb,
struct ipr_vpd *vpd)
{
char buffer[IPR_VENDOR_ID_LEN + IPR_PROD_ID_LEN + IPR_SERIAL_NUM_LEN + 3];
int i = 0;
char vendor_id[IPR_VENDOR_ID_LEN + 1];
char product_id[IPR_PROD_ID_LEN + 1];
char sn[IPR_SERIAL_NUM_LEN + 1];
memcpy(buffer, vpd->vpids.vendor_id, IPR_VENDOR_ID_LEN);
i = strip_and_pad_whitespace(IPR_VENDOR_ID_LEN - 1, buffer);
memcpy(vendor_id, vpd->vpids.vendor_id, IPR_VENDOR_ID_LEN);
strip_whitespace(IPR_VENDOR_ID_LEN, vendor_id);
memcpy(&buffer[i], vpd->vpids.product_id, IPR_PROD_ID_LEN);
i = strip_and_pad_whitespace(i + IPR_PROD_ID_LEN - 1, buffer);
memcpy(product_id, vpd->vpids.product_id, IPR_PROD_ID_LEN);
strip_whitespace(IPR_PROD_ID_LEN, product_id);
memcpy(&buffer[i], vpd->sn, IPR_SERIAL_NUM_LEN);
buffer[IPR_SERIAL_NUM_LEN + i] = '\0';
memcpy(sn, vpd->sn, IPR_SERIAL_NUM_LEN);
strip_whitespace(IPR_SERIAL_NUM_LEN, sn);
ipr_hcam_err(hostrcb, "%s VPID/SN: %s\n", prefix, buffer);
ipr_hcam_err(hostrcb, "%s VPID/SN: %s %s %s\n", prefix,
vendor_id, product_id, sn);
}
/**