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Message-ID: <20230525081558.38ee5cde@hermes.local> Date: Thu, 25 May 2023 08:15:58 -0700 From: Stephen Hemminger <stephen@...workplumber.org> To: netdev@...r.kernel.org Cc: bugzilla-daemon@...nel.org Subject: Re: [Bug 217486] New: 'doubel fault' in if_nlmsg_size func by syz-executor fuzz Not much info in this bug report. Blaming if_nlmsg_size() is not right, something is passing bogus data. On Thu, 25 May 2023 12:40:12 +0000 bugzilla-daemon@...nel.org wrote: > https://bugzilla.kernel.org/show_bug.cgi?id=217486 > > Bug ID: 217486 > Summary: 'doubel fault' in if_nlmsg_size func by syz-executor > fuzz > Product: Networking > Version: 2.5 > Hardware: All > OS: Linux > Status: NEW > Severity: normal > Priority: P3 > Component: IPV4 > Assignee: stephen@...workplumber.org > Reporter: 13151562558@....com > Regression: No > > in syz-executor fuzz test, system panic in "double fault" err. > by the kernel log, only get one dump stack info, "if_nlmsg_size+0x4ea/0x7c0". > I have vmcore, but don't know how to debug "double fault"? what't first fault ? > > if_nlmsg_size+0x4ea/0x7c0 code: > ``` > static noinline size_t if_nlmsg_size(const struct net_device *dev, > u32 ext_filter_mask) > { > return NLMSG_ALIGN(sizeof(struct ifinfomsg)) > + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ > + nla_total_size(IFALIASZ) /* IFLA_IFALIAS */ > > + nla_total_size(4) /* IFLA_MIN_MTU */ > + nla_total_size(4) /* IFLA_MAX_MTU */ > + rtnl_prop_list_size(dev) // this > line;if_nlmsg_size+0x4ea/0x7c0 > + nla_total_size(MAX_ADDR_LEN) /* IFLA_PERM_ADDRESS */ > + 0; > } > ``` > > dis the code of dump stack, like this: > /include/linux/list.h: > <if_nlmsg_size+1325>: mov %rbp,%rdx > <if_nlmsg_size+1328>: shr $0x3,%rdx > <if_nlmsg_size+1332>: cmpb $0x0,(%rdx,%rax,1) > <if_nlmsg_size+1336>: jne 0xffffffff8a5b86a6 <if_nlmsg_size+1766> > <if_nlmsg_size+1342>: mov 0x10(%r15),%rax > <if_nlmsg_size+1346>: cmp %rax,%rbp > <if_nlmsg_size+1349>: je 0xffffffff8a5b8659 <if_nlmsg_size+1689> > > > kernel log: > [ 3213.317259] CPU: 1 PID: 1830 Comm: syz-executor.6 Tainted: G D > 5.10.0 #1 > [ 3213.317404] RIP: 0010:if_nlmsg_size+0x53e/0x7c0 > [ 3213.317415] Code: 00 0f 85 2e 02 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b > 7b 10 49 8d 6f 10 48 89 ea 48 c1 ea 03 80 3c 02 00 0f 85 a8 01 00 00 <49> 8b 47 > 10 48 39 c5 0f 84 4e 01 00 00 e8 90 ff 1a f7 48 89 ea 48 > [ 3213.317420] RSP: 0018:ffff88809f4ca570 EFLAGS: 00010246 > [ 3213.317428] RAX: dffffc0000000000 RBX: ffff88803767c000 RCX: > ffffc90006714000 > [ 3213.317433] RDX: 1ffff11008037c92 RSI: ffffffff8a5b84aa RDI: > ffff88803767c010 > [ 3213.317439] RBP: ffff8880401be490 R08: 0000000000000cc0 R09: > 0000000000000000 > [ 3213.317445] R10: ffffffff9287d2e7 R11: fffffbfff250fa5c R12: > 0000000000000640 > [ 3213.317450] R13: 0000000000000950 R14: 0000000000000008 R15: > ffff8880401be480 > [ 3213.317454] ? if_nlmsg_size+0x4ea/0x7c0 > [ 3213.317457] </#DF> >
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