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[204.195.96.226]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-6fd7718a750sm7634076d6.8.2025.06.26.06.55.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 26 Jun 2025 06:55:44 -0700 (PDT) Date: Thu, 26 Jun 2025 06:55:41 -0700 From: Stephen Hemminger To: z30015464 Cc: , , , , , Subject: Re: [Issue] iproute2: coredump problem with command ip link xstats Message-ID: <20250626065519.753de723@hermes.local> In-Reply-To: <20250619074552.1775627-1-zhongxuan2@huawei.com> References: <20250619074552.1775627-1-zhongxuan2@huawei.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable On Thu, 19 Jun 2025 15:45:52 +0800 z30015464 wrote: > Hello everyone, >=20 > I having an issues while using iprute2 6.15.0. When I created a bond and = intended to use 'ip link xstats' command to query extended information, a s= tack overflow occurred, followed by a coredump. I couldn't identify the roo= t cause through the code and need some help. >=20 > Example: > ifconfig eth1 up > modprobe bonding mode=3D4 max_bonds=3D1 lacp_rate=3D1 miimon=3D100 > ip addr add 7.7.0.100/24 dev bond0 > ip link xstats type bond dev bond0 >=20 > Here is the result: > [root@localhost /]# ip link xstats type bond > bond0 > LACPDU Rx 0 > LACPDU Tx 0 > LACPDU Unknown type Rx 0 > LACPDU Illegal Rx 0 > Marker Rx 0 > Marker Tx 0 > Marker response Rx 0 > Marker response Tx 0 > Marker unknown type Rx 0 > *** stack smashing detected ***: terminated > Aborted (core dumped) >=20 > Here is the result with valgrind: > [root@localhost /]# valgrind ip link xstats type bond dev bond0 > =3D=3D242893=3D=3D Memcheck, a memory error detector > =3D=3D242893=3D=3D Copyright (C) 2002-2022, and GNU GPL'd, by Julian Sewa= rd et al. > =3D=3D242893=3D=3D Using Valgrind-3.22.0 and LibVEX; rerun with -h for co= pyright info > =3D=3D242893=3D=3D Command: ip link xstats type bond dev bond0 > =3D=3D242893=3D=3D > bond0 > LACPDU Rx 0 > LACPDU Tx 0 > LACPDU Unknown type Rx 0 > LACPDU Illegal Rx 0 > Marker Rx 0 > Marker Tx 0 > Marker response Rx 0 > Marker response Tx 0 > Marker unknown type Rx 0 > *** stack smashing detected ***: terminated > =3D=3D242893=3D=3D > =3D=3D242893=3D=3D Process terminating with default action of signal 6 (S= IGABRT) > =3D=3D242893=3D=3D at 0x498AB5C: __pthread_kill_implementation (pthrea= d_kill.c:44) > =3D=3D242893=3D=3D by 0x493CF45: raise (raise.c:26) > =3D=3D242893=3D=3D by 0x492733B: abort (abort.c:79) > =3D=3D242893=3D=3D by 0x49281A8: __libc_message.cold (libc_fatal.c:152) > =3D=3D242893=3D=3D by 0x4A1621A: __fortify_fail (fortify_fail.c:24) > =3D=3D242893=3D=3D by 0x4A17435: __stack_chk_fail (stack_chk_fail.c:24) > =3D=3D242893=3D=3D by 0x157A81: bond_print_stats_attr (iplink_bond.c:8= 77) > =3D=3D242893=3D=3D by 0x157B02: bond_print_xstats (iplink_bond.c:895) > =3D=3D242893=3D=3D by 0x1846A9: rtnl_dump_filter_l (libnetlink.c:926) > =3D=3D242893=3D=3D by 0x185A01: rtnl_dump_filter_nc (libnetlink.c:969) > =3D=3D242893=3D=3D by 0x16B0BF: iplink_ifla_xstats (iplink_xstats.c:71) > =3D=3D242893=3D=3D by 0x118C3C: do_cmd (ip.c:131) > =3D=3D242893=3D=3D > =3D=3D242893=3D=3D HEAP SUMMARY: > =3D=3D242893=3D=3D in use at exit: 33,878 bytes in 4 blocks > =3D=3D242893=3D=3D total heap usage: 8 allocs, 4 frees, 66,755 bytes al= located > =3D=3D242893=3D=3D > =3D=3D242893=3D=3D LEAK SUMMARY: > =3D=3D242893=3D=3D definitely lost: 0 bytes in 0 blocks > =3D=3D242893=3D=3D indirectly lost: 0 bytes in 0 blocks > =3D=3D242893=3D=3D possibly lost: 0 bytes in 0 blocks > =3D=3D242893=3D=3D still reachable: 33,878 bytes in 4 blocks > =3D=3D242893=3D=3D suppressed: 0 bytes in 0 blocks > =3D=3D242893=3D=3D Rerun with --leak-check=3Dfull to see details of leake= d memory > =3D=3D242893=3D=3D > =3D=3D242893=3D=3D For lists of detected and suppressed errors, rerun wit= h: -s > =3D=3D242893=3D=3D ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0= from 0) > Aborted (core dumped) >=20 > Through gdb debugging, __stack_chk_fail was triggered after the end of fu= nction bond_print_stats_attr function. > I first found this issue in version 6.6.0. After replacing package 6.15.0= , the issue still persists.=20 > I also tried version 5.15.0 but there was no abnormality. > Maybe some modifications triggered this issue, but I cannot found the cau= se. I hope to get some helps. >=20 > Thank you very much. >=20 >=20 >=20 Thanks, fixed it with: =46rom e4d10d064f5dbc64e4d2d73074c33b54d06b4514 Mon Sep 17 00:00:00 2001 From: Stephen Hemminger Date: Thu, 26 Jun 2025 06:50:17 -0700 Subject: [PATCH] bond: fix stack smash in xstats Building with stack smashing detection finds an off by one in the bond xstats attribute parsing. $ ip link xstats type bond dev bond0 [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". bond0 LACPDU Rx 0 LACPDU Tx 0 LACPDU Unknown type Rx 0 LACPDU Illegal Rx 0 Marker Rx 0 Marker Tx 0 Marker response Rx 0 Marker response Tx 0 Marker unknown type Rx 0 *** stack smashing detected ***: terminated Program received signal SIGABRT, Aborted. Reported-by: z30015464 Fixes: 440c5075d662 ("ip: bond: add xstats support") Cc: nikolay@cumulusnetworks.com Signed-off-by: Stephen Hemminger --- ip/iplink_bond.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/ip/iplink_bond.c b/ip/iplink_bond.c index 19af67d0..62dd907c 100644 --- a/ip/iplink_bond.c +++ b/ip/iplink_bond.c @@ -852,7 +852,7 @@ static void bond_print_stats_attr(struct rtattr *attr, = int ifindex) const char *ifname =3D ""; int rem; =20 - parse_rtattr(bondtb, LINK_XSTATS_TYPE_MAX+1, RTA_DATA(attr), + parse_rtattr(bondtb, LINK_XSTATS_TYPE_MAX, RTA_DATA(attr), RTA_PAYLOAD(attr)); if (!bondtb[LINK_XSTATS_TYPE_BOND]) return; --=20 2.47.2