Looking through the netlink/attr.c code I noticed that NLA_STRING attributes that end with a binary NUL have it removed before passing it to the consumer.
For wireless, we have a few places where we need to be able to accept any (even binary) values, for example for the SSID; the SSID can validly end with \0 and I'd still love to be able to take advantage of NLA_STRING and .len = 32 so I don't need to check the length myself. However, given the code above, an SSID with a terminating \0 would be reduced by one character. This patch removes the trimming. Signed-off-by: Johannes Berg <[EMAIL PROTECTED]> --- This shouldn't break things if all users that rely on terminating NULs have migrated to NLA_NUL_STRING already. I don't see many users of NLA_STRING still, but if we can't make that change because some users still rely on it trimming the NUL I could also make a patch that introduces NLA_BIN_STRING with the changed semantics. --- wireless-dev.orig/net/netlink/attr.c 2007-03-23 00:06:41.293435409 +0100 +++ wireless-dev/net/netlink/attr.c 2007-03-23 00:07:13.753435409 +0100 @@ -56,15 +56,8 @@ static int validate_nla(struct nlattr *n if (attrlen < 1) return -ERANGE; - if (pt->len) { - char *buf = nla_data(nla); - - if (buf[attrlen - 1] == '\0') - attrlen--; - - if (attrlen > pt->len) - return -ERANGE; - } + if (pt->len && attrlen > pt->len) + return -ERANGE; break; default: - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html