wpa_supplicant segfaults with ath

Brooks Davis brooks at one-eyed-alien.net
Tue Aug 30 17:13:32 GMT 2005


On Tue, Aug 30, 2005 at 06:10:00AM -0700, Hanns Hartman wrote:
> That work perfectly thanks.  No more errors.  I also wanted to know if 
> there is an easy bit of script I can impliment in order to have the 
> wpa_supplicant load at boot up.

As per rc.conf(5), add WPA to your ifconfig_<ifn> entry in /etc/rc.conf.

-- Brooks

> >From: Sam Leffler <sam at errno.com>
> >To: Pascal Hofstee <caelian at gmail.com>
> >CC: freebsd-current at freebsd.org, Hanns Hartman <rowinggoon at hotmail.com>
> >Subject: Re: wpa_supplicant segfaults with ath
> >Date: Mon, 29 Aug 2005 10:26:58 -0700
> >
> >Pascal Hofstee wrote:
> >>On Sun, 2005-08-28 at 23:12 -0700, Hanns Hartman wrote:
> >>
> >>>Hi,
> >>>  This is my first time posting to the list so if you need more 
> >>>information let me know. also since I have no internet on my freebsd box 
> >>>it is difficult to get all of the verbose output. so here goes.
> >>>
> >>>I am using freebsd6.0beta2 on an amd64. I am using the src tree from 
> >>>august 21.
> >>>
> >>>I am trying to associate with a 2wire gateway that was supplied by sbc 
> >>>for my dsl.  I have set the gateway up with wpa-psk encription.
> >>>I am able to connect perfectly fine to this gateway with my ibm t42 but 
> >>>when I try to associate with the gateway using wpa_supplicant I get a 
> >>>segmentation fault after the program reaches "wpa: sending eapol-key 
> >>>4/4" specifially it faults right after displaying "wpa: rsc - 
> >>>hexdump(len=6): 00 00 00 00 00 00" while using option -d for output.
> >>>
> >>>when running the supplicant in gdb I get program received SIGSEGV, 
> >>>segmentation fault.  0x000000080082d4d0 in strlen () from /lib/libc.so.6
> >>>
> >>>if there is anything else needed that might help to explain the problem 
> >>>let me know.  I appoligize for not having more output to post at this 
> >>>time.
> >>>thanks for the help
> >>>Hanns
> >>
> >>
> >>Thank you for posting this ... as it reminded me i should probably file
> >>a bug report on this. I recently tried to do some investigative work of
> >>my own hoping to find out why my if_ral interface kept acting up when i
> >>bumped into the exact same problem myself.
> >>
> >>i can tell you why the segfault happens .. though i am not entirely sure
> >>how it should be fixed properly.
> >>
> >>The problem you're experiencing is caused by the ether_ntoa(addr) call
> >>in /usr/src/usr.sbin/wpa/wpa_supplicant/driver_freebsd.c:280
> >>
> >>ether_ntoa expects a "const struct ether_addr" as it's parameter where
> >>in the code the parameter passed is a "const unsigned char*", further
> >>more in that same printf statement seq_len and key_len are being
> >>displayed using "%d" where this should be "%zu" since these are
> >>size_t's. The size_t construct happens a few more times in the code if i
> >>recall correctly.
> >>
> >>The actual crash you're experiencing though is caused by the faulty
> >>ether_ntoa argument.
> >>
> >>If somebody more knowledgable on this particular subject could have a
> >>closer look at what was actually intended here that would be
> >>appreciated.
> >>
> >
> >A stack trace at the time of the segfault would be useful.  The type 
> >mismatches should not be an issue unless there are alignment problems. 
> >Please try the attached change which should correct any alignment issues.
> >
> >	Sam
> 
> 
> >Index: driver_freebsd.c
> >===================================================================
> >RCS file: /usr/ncvs/src/usr.sbin/wpa/wpa_supplicant/driver_freebsd.c,v
> >retrieving revision 1.7
> >diff -u -r1.7 driver_freebsd.c
> >--- driver_freebsd.c	13 Aug 2005 04:23:33 -0000	1.7
> >+++ driver_freebsd.c	29 Aug 2005 17:24:14 -0000
> >@@ -30,6 +30,7 @@
> >
> > #include <sys/socket.h>
> > #include <net/if.h>
> >+#include <net/ethernet.h>
> >
> > #include <net80211/ieee80211.h>
> > #include <net80211/ieee80211_crypto.h>
> >@@ -231,8 +232,11 @@
> > 	memset(&wk, 0, sizeof(wk));
> > 	if (addr != NULL &&
> > 	    bcmp(addr, "\xff\xff\xff\xff\xff\xff", IEEE80211_ADDR_LEN) != 0) 
> > 	    {
> >+		struct ether_addr ea;
> >+
> >+		memcpy(&ea, addr, IEEE80211_ADDR_LEN);
> > 		wpa_printf(MSG_DEBUG, "%s: addr=%s keyidx=%d",
> >-			__func__, ether_ntoa(addr), key_idx);
> >+			__func__, ether_ntoa(&ea), key_idx);
> > 		memcpy(wk.idk_macaddr, addr, IEEE80211_ADDR_LEN);
> > 		wk.idk_keyix = (uint8_t) IEEE80211_KEYIX_NONE;
> > 	} else {
> >@@ -250,6 +254,7 @@
> > {
> > 	struct wpa_driver_bsd_data *drv = priv;
> > 	struct ieee80211req_key wk;
> >+	struct ether_addr ea;
> > 	char *alg_name;
> > 	u_int8_t cipher;
> >
> >@@ -275,18 +280,19 @@
> > 		return -1;
> > 	}
> >
> >+	memcpy(&ea, addr, IEEE80211_ADDR_LEN);
> > 	wpa_printf(MSG_DEBUG,
> >-		"%s: alg=%s addr=%s key_idx=%d set_tx=%d seq_len=%d 
> >key_len=%d",
> >-		__func__, alg_name, ether_ntoa(addr), key_idx, set_tx,
> >+		"%s: alg=%s addr=%s key_idx=%d set_tx=%d seq_len=%zu 
> >key_len=%zu",
> >+		__func__, alg_name, ether_ntoa(&ea), key_idx, set_tx,
> > 		seq_len, key_len);
> >
> > 	if (seq_len > sizeof(u_int64_t)) {
> >-		wpa_printf(MSG_DEBUG, "%s: seq_len %d too big",
> >+		wpa_printf(MSG_DEBUG, "%s: seq_len %zu too big",
> > 			__func__, seq_len);
> > 		return -2;
> > 	}
> > 	if (key_len > sizeof(wk.ik_keydata)) {
> >-		wpa_printf(MSG_DEBUG, "%s: key length %d too big",
> >+		wpa_printf(MSG_DEBUG, "%s: key length %zu too big",
> > 			__func__, key_len);
> > 		return -3;
> > 	}
> 
> 
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> 
> 
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