Re: 2.2.15 + IPv6: serious bug when removing aliased interfaces

From: Peter T. Breuer (ptb@it.uc3m.es)
Date: Sun May 21 2000 - 14:19:55 EDT

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    "A month of sundays ago Peter T. Breuer wrote:"
    > "A month of sundays ago Alan Cox wrote:"
    > > > [not ac]
    > > > Because the this only happens with IPv6, it is an obvious bug. In
    > > > addition, about 99.9% of people are using commands like 'ifconfig eth0:5
    > > So strace your ifconfig eth0:5 down figure out which ioctl is causing the

    > It might be the ifconfig version. The most obvious differences in the

    It looks like it. I switched kernels on my machine with a 2.2.10 kernel
    exhibiting th ebug downstairs, loaded ipv6 and tried the test (ifconfig
    lo:0 127.0.0.2; ifconfig lo:0 down, does lo disappear too?). It worked
    fine with my version of ifconfig. net-tools 1.432 ifconfig 1.29
    (1997-09-23), linked against libc 5.4.38.

    I then took the ifconfig from downstairs and ran it up here. It
    exhibited the bug. net-tools 1.54 ifconfig 1.39 (1999-03-18), linked
    against glibc 2.1.2.

    Does anyone want the full traces? They're really pretty different,
    but only about a page long each.

    > traces is that downstairs (2.2.10), the ifconfig does a whole lot of
    > rooting around in proc:
    >
    > access("/proc/net", R_OK) = 0
    > access("/proc/net/unix", R_OK) = 0
    > socket(PF_UNIX, SOCK_DGRAM, 0) = 3
    > socket(PF_INET, SOCK_DGRAM, IPPROTO_IP) = 4
    > access("/proc/net/if_inet6", R_OK) = 0
    > socket(PF_INET6, SOCK_DGRAM, 0) = 5
    > access("/proc/net/ax25", R_OK) = -1 ENOENT (No such file or directory)
    >
    > None of that upstairs here (2.2.15). Downstairs (2.2.10), the final
    > ioctl is:
    >
    > ioctl(5, SIOCGIFFLAGS, 0xbffff5ec) = 0
    > ioctl(5, SIOCSIFFLAGS, 0xbffff5ec) = 0
    >
    > and upstairs (2.2.15) it is:
    >
    > ioctl(3, SIOCGIFFLAGS, 0xbfffee60) = 0
    > ioctl(3, SIOCSIFFLAGS, 0xbfffee60) = 0
    >
    > Downstairs (2.2.10), 5 is a socket:
    >
    > access("/proc/net/if_inet6", R_OK) = 0
    > socket(PF_INET6, SOCK_DGRAM, 0) = 5
    >
    > and upstairs (2.2.15), 3 is a slightly different socket:
    >
    > socket(PF_INET, SOCK_DGRAM, IPPROTO_IP) = 3
    >

    Peter

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