Hi Steve, On 5 Oct 2023, at 17:36, Steve Kargl wrote: > In case anyone else is using openvpn. > > % pkg info openvpn > openvpn-2.6.6 > Name : openvpn > Version : 2.6.6 > Installed on : Tue Sep 19 08:48:55 2023 PDT > Origin : security/openvpn > Architecture : FreeBSD:15:amd64 > > % uname -a > FreeBSD hotrats 15.0-CURRENT #1 main-n265325-9c30461dd25b: > Thu Sep 14 08:09:18 PDT 2023 kargl@hotrats:$PATH/HOTRATS amd64 > > > Fatal double fault > rip 0xffffffff8099b408 rsp 0xfffffe000e1cc000 rbp 0xfffffe000e1cc010 > rax 0x53749f62934c5349 rdx 0x53749f62934c5349 rbx 0xfffffe000e1cc200 > rcx 0x57bf32fec3cbde70 rsi 0x32e8db2f0591c5da rdi 0x832f0fb1e6d07eb0 > r8 0 r9 0 r10 0 > r11 0x60 r12 0x5af7589946bd13d9 r13 0xbeddd6a808e1dd54 > r14 0xcdf12bbf2708189c r15 0xeb262ae8536a7adf rflags 0x10246 > cs 0x20 ss 0x28 ds 0x3b es 0x3b fs 0x13 gs 0x1b > fsbase 0x1c02e381d120 gsbase 0xffffffff81a10000 kgsbase 0 > cpuid = 0; apic id = 00 > panic: double fault > cpuid = 0 > time = 1696512769 > KDB: stack backtrace: > db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xffffffff812b3060 > vpanic() at vpanic+0x132/frame 0xffffffff812b3190 > panic() at panic+0x43/frame 0xffffffff812b31f0 > dblfault_handler() at dblfault_handler+0x1ce/frame 0xffffffff812b32b0 > Xdblfault() at Xdblfault+0xd7/frame 0xffffffff812b32b0 > --- trap 0x17, rip = 0xffffffff8099b408, rsp = 0xfffffe000e1cc000, rbp = > 0xfffffe000e1cc010 --- > gfmultword4() at gfmultword4+0x8/frame 0xfffffe000e1cc010 > gf128_mul4b() at gf128_mul4b+0x63/frame 0xfffffe000e1cc050 > AES_GMAC_Update() at AES_GMAC_Update+0x73/frame 0xfffffe000e1cc0b0 > swcr_gcm() at swcr_gcm+0x660/frame 0xfffffe000e1cc830 > swcr_process() at swcr_process+0x1a/frame 0xfffffe000e1cc850 > crypto_dispatch() at crypto_dispatch+0x42/frame 0xfffffe000e1cc870 > ovpn_transmit_to_peer() at ovpn_transmit_to_peer+0x54e/frame > 0xfffffe000e1cc8d0 > ovpn_output() at ovpn_output+0x2a2/frame 0xfffffe000e1cc950 > ip_output() at ip_output+0x11f6/frame 0xfffffe000e1cca40 > ovpn_encap() at ovpn_encap+0x3e7/frame 0xfffffe000e1ccac0 > > #13 0xffffffff80ae08ce in dblfault_handler (frame=<optimized out>) > at /usr/src/sys/amd64/amd64/trap.c:1012 > #14 <signal handler called> > #15 0xffffffff8099b408 in gfmultword4 (worda=3668422891496654298, > wordb=9452791399630012080, wordc=6013606648173318985, > wordd=6322828471639465584, x=..., tbl=0xfffffe000e1cc200) > at /usr/src/sys/opencrypto/gfmult.c:174 > #16 0xffffffff8099b5d3 in gf128_mul4b (r=..., > v=v@entry=0xfffff800076b9a64 > "\3156}\373\312w\254iBnD\001ܹ˾\353&*\350Sjzß/\017\261\346\320~\260Z\367X\231F\275\023\331St\237b\223LSI\276\335Ö¨\b\341\335TW\2772\376\303\313\336pN\265\023\352\2054\002\a/˦9R\321\366p\f\352\204P\360\270\371\250\\\aE?7s\377\253\217b\262%\214\317m", > tbl=tbl@entry=0xfffffe000e1cc200) at /usr/src/sys/opencrypto/gfmult.c:268 > #17 0xffffffff8099ab13 in AES_GMAC_Update (ctx=0xfffffe000e1cc200, > vdata=<optimized out>, len=144) at /usr/src/sys/opencrypto/gmac.c:94 > #18 0xffffffff80998ae0 in swcr_gcm (ses=0xfffff8020376a048, > crp=0xfffff80023386c08) at /usr/src/sys/opencrypto/cryptosoft.c:505 > #19 0xffffffff80997c4a in swcr_process (dev=<optimized out>, > crp=0xfffff80023386c08, hint=<optimized out>) > at /usr/src/sys/opencrypto/cryptosoft.c:1680 > Do you have a bit more information about what happened here? As in: can you reproduce this, or do you have any idea what was going on to trigger this? Did anything change in your setup (i.e. is if_ovpn use new, or did you update either kernel or userspace or …?
Do you have the full core dump to poke at? It might be a bug in the crypto code, but it could also be a bug in the if_ovpn code, so I’d like to work out what caused this. Best regards, Kristof
