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authorJosh Triplett <josh@joshtriplett.org>2021-06-02 04:38:41 +0300
committerDavid S. Miller <davem@davemloft.net>2021-06-02 23:27:03 +0300
commitb508d5fb69c2211a1b860fc058aafbefc3b3c3cd (patch)
treecc34cd01c5f7c13661b418a51240750e11cbc049 /net
parentdd62766239d54e00201a6a75b6b348f816bb96af (diff)
downloadlinux-b508d5fb69c2211a1b860fc058aafbefc3b3c3cd.tar.xz
net: ipconfig: Don't override command-line hostnames or domains
If the user specifies a hostname or domain name as part of the ip= command-line option, preserve it and don't overwrite it with one supplied by DHCP/BOOTP. For instance, ip=::::myhostname::dhcp will use "myhostname" rather than ignoring and overwriting it. Fix the comment on ic_bootp_string that suggests it only copies a string "if not already set"; it doesn't have any such logic. Signed-off-by: Josh Triplett <josh@joshtriplett.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/ipv4/ipconfig.c13
1 files changed, 8 insertions, 5 deletions
diff --git a/net/ipv4/ipconfig.c b/net/ipv4/ipconfig.c
index bc2f6ca97152..816d8aad5a68 100644
--- a/net/ipv4/ipconfig.c
+++ b/net/ipv4/ipconfig.c
@@ -886,7 +886,7 @@ static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_d
/*
- * Copy BOOTP-supplied string if not already set.
+ * Copy BOOTP-supplied string
*/
static int __init ic_bootp_string(char *dest, char *src, int len, int max)
{
@@ -935,12 +935,15 @@ static void __init ic_do_bootp_ext(u8 *ext)
}
break;
case 12: /* Host name */
- ic_bootp_string(utsname()->nodename, ext+1, *ext,
- __NEW_UTS_LEN);
- ic_host_name_set = 1;
+ if (!ic_host_name_set) {
+ ic_bootp_string(utsname()->nodename, ext+1, *ext,
+ __NEW_UTS_LEN);
+ ic_host_name_set = 1;
+ }
break;
case 15: /* Domain name (DNS) */
- ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
+ if (!ic_domain[0])
+ ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
break;
case 17: /* Root path */
if (!root_server_path[0])