[Fwd: Bug#488430: iproute: lnstat causes segmentation fault]

[Andreas Henriksson <andreas@fatal.se>]

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Hi Stephen and others interested!

Could you please have a look at lnstat. We got a bugreport in Debian
about it segfaulting. It happens for me too on my workstation (amd64),
which is also my internet gateway at home, but not on my laptop (i386).

I can't figure out what's going on. The segfault only happens when
lnstat is compiled with atleast -O1. It seems like the fp->params array
is getting corrupted at 65th element inside build_hdr_string() at the
first for loop where memory is malloced and memset. That seems totally
unrelated to me though, could it be something like use of freed memory?
I have no clue...

In case you can't reproduce, I've made a tarball of my /proc/net/stat
and attached, which I hope helps.

PS. any news on the debian front (stuff sent to 488430@bugs.debian.org)
will be available through http://bugs.debian.org/488430 (and other
problems at http://bugs.debian.org/iproute ).



-------- Forwarded Message --------
From: Andrew France <andrew@avito.co.uk>
Reply-To: Andrew France <andrew@avito.co.uk>, 488430@bugs.debian.org
To: Debian Bug Tracking System <submit@bugs.debian.org>
Subject: Bug#488430: iproute: lnstat causes segmentation fault
Date: Sat, 28 Jun 2008 21:30:06 +0100

Package: iproute
Version: 20080417-1
Severity: important

Hi,

Running 'lnstat' results in a segmentation fault, although the symlinked
'rtstat' runs fine. Lnstat strace included below.


-- System Information:
Debian Release: lenny/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.24-1-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash

Versions of packages iproute depends on:
ii  libc6                         2.7-10     GNU C Library: Shared libraries
ii  libdb4.6                      4.6.21-8   Berkeley v4.6 Database Libraries [

Versions of packages iproute recommends:
ii  libatm1                       2.4.1-17.2 shared library for ATM (Asynchrono

-- no debconf information

*** lnstat.strace
execve("/usr/bin/lnstat", ["lnstat"], [/* 22 vars */]) = 0
brk(0)                                  = 0x604000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x2b0f210df000
access("/etc/ld.so.nohwcap", F_OK)      = -1 ENOENT (No such file or directory)
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x2b0f210e0000
access("/etc/ld.so.preload", R_OK)      = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY)      = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=36821, ...}) = 0
mmap(NULL, 36821, PROT_READ, MAP_PRIVATE, 3, 0) = 0x2b0f210e2000
close(3)                                = 0
access("/etc/ld.so.nohwcap", F_OK)      = -1 ENOENT (No such file or directory)
open("/lib/libresolv.so.2", O_RDONLY)   = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0P3\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0644, st_size=72568, ...}) = 0
mmap(NULL, 2177800, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x2b0f212e0000
mprotect(0x2b0f212f0000, 2097152, PROT_NONE) = 0
mmap(0x2b0f214f0000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x10000) = 0x2b0f214f0000
mmap(0x2b0f214f2000, 6920, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x2b0f214f2000
close(3)                                = 0
access("/etc/ld.so.nohwcap", F_OK)      = -1 ENOENT (No such file or directory)
open("/lib/libc.so.6", O_RDONLY)        = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\340\342"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=1330480, ...}) = 0
mmap(NULL, 3437144, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x2b0f214f4000
mprotect(0x2b0f21632000, 2097152, PROT_NONE) = 0
mmap(0x2b0f21832000, 20480, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x13e000) = 0x2b0f21832000
mmap(0x2b0f21837000, 16984, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x2b0f21837000
close(3)                                = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x2b0f2183c000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x2b0f2183d000
arch_prctl(ARCH_SET_FS, 0x2b0f2183caf0) = 0
mprotect(0x2b0f21832000, 12288, PROT_READ) = 0
munmap(0x2b0f210e2000, 36821)           = 0
open("/proc/net/stat", O_RDONLY|O_NONBLOCK|O_DIRECTORY|0x80000) = 3
fstat(3, {st_mode=S_IFDIR|0555, st_size=0, ...}) = 0
fcntl(3, F_GETFD)                       = 0x1 (flags FD_CLOEXEC)
brk(0)                                  = 0x604000
brk(0x625000)                           = 0x625000
getdents(3, /* 8 entries */, 1024)      = 248
open("/proc/net/stat/ip_conntrack", O_RDONLY) = 4
fstat(4, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x2b0f210e2000
lseek(4, 0, SEEK_SET)                   = 0
read(4, "entries  searched found new inva"..., 1024) = 444
open("/proc/net/stat/nf_conntrack", O_RDONLY) = 5
fstat(5, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x2b0f210e3000
lseek(5, 0, SEEK_SET)                   = 0
read(5, "entries  searched found new inva"..., 1024) = 444
open("/proc/net/stat/ndisc_cache", O_RDONLY) = 6
fstat(6, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x2b0f210e4000
lseek(6, 0, SEEK_SET)                   = 0
read(6, "entries  allocs destroys hash_gr"..., 1024) = 338
open("/proc/net/stat/clip_arp_cache", O_RDONLY) = 7
fstat(7, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x2b0f210e5000
lseek(7, 0, SEEK_SET)                   = 0
read(7, "entries  allocs destroys hash_gr"..., 1024) = 338
open("/proc/net/stat/rt_cache", O_RDONLY) = 8
fstat(8, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x2b0f210e6000
lseek(8, 0, SEEK_SET)                   = 0
read(8, "entries  in_hit in_slow_tot in_s"..., 1024) = 517
open("/proc/net/stat/arp_cache", O_RDONLY) = 9
fstat(9, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x2b0f210e7000
lseek(9, 0, SEEK_SET)                   = 0
read(9, "entries  allocs destroys hash_gr"..., 1024) = 338
getdents(3, /* 0 entries */, 1024)      = 0
close(3)                                = 0
mmap(NULL, 6356992, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x2b0f2183e000
munmap(0x2b0f2183e000, 6356992)         = 0
brk(0xc42000)                           = 0xc42000
--- SIGSEGV (Segmentation fault) @ 0 (0) ---
+++ killed by SIGSEGV +++
Process 19271 detached



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