Hi,

Could you please send me how to reproduce the bug?
It just works for me... but for sure my setup is different.

On Wed, Jan 15, 2020 at 10:03 PM Sjoerd Simons <sjo...@debian.org> wrote:

> Package: slirp
> Version: 1:1.0.17-9
> Severity: important
>
> The last upload fixes slirp crashes directly on startup on amd64; It now
> just crashes
> when starting to use it....
>
> backtrace:
> Program terminated with signal SIGSEGV, Segmentation fault.
> #0  0x00005567818fa30b in tcp_reass (tp=tp@entry=0x556782590610,
> ti=0x82590610, ti@entry=0x0, m=<optimized out>, m@entry=0x0)
>     at ./tcp_input.c:210
> 210     ./tcp_input.c: No such file or directory.
> (gdb) bt
> #0  0x00005567818fa30b in tcp_reass (tp=tp@entry=0x556782590610,
> ti=0x82590610, ti@entry=0x0, m=<optimized out>, m@entry=0x0)
>     at ./tcp_input.c:210
> #1  0x00005567818fb8c1 in tcp_input (m=0x55678258ed00, iphlen=<optimized
> out>, inso=inso@entry=0x0) at ./tcp_input.c:1074
> #2  0x00005567818f073c in ip_input (m=<optimized out>) at ip_input.c:214
> #3  0x00005567818f86ef in sl_dispatch (ttyp=ttyp@entry=0x55678258b2d0) at
> ./sl.c:127
> #4  0x00005567818f889e in sl_input (ttyp=0x55678258b2d0,
> if_bptr=0x7ffdd869e9e9 "\300\004\005\264\004\002\b\n\366KBX",
>     if_n=<optimized out>) at ./sl.c:35
> #5  0x00005567818ef6b2 in if_input (ttyp=0x55678258b2d0) at ./if.c:191
> #6  0x00005567818f24a4 in main_loop () at ./main.c:1158
> #7  0x00005567818e37d7 in main (argc=1, argv=0x7ffdd869f848) at ./main.c:95
>
>
> Problem now is usage of dereferences of seg_next which again is a pointer
> cast to a 32 bit value to cause disaster.
>
> Most likely all the usages of `#if SIZEOF_CHAR_P == 4` should be reviewed
> and
> fixed up to properly make slirp work on 64 bit systrms...
>
> -- System Information:
> Debian Release: bullseye/sid
>   APT prefers unstable-debug
>   APT policy: (500, 'unstable-debug'), (500, 'unstable'), (500,
> 'testing'), (500, 'stable'), (1, 'experimental')
> Architecture: amd64 (x86_64)
>
> Kernel: Linux 5.4.0-2-amd64 (SMP w/4 CPU cores)
> Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8),
> LANGUAGE=en_GB.UTF-8 (charmap=UTF-8)
> Shell: /bin/sh linked to /usr/bin/dash
> Init: systemd (via /run/systemd/system)
> LSM: AppArmor: enabled
>
> Versions of packages slirp depends on:
> ii  libc6      2.29-9
> ii  libcrypt1  1:4.4.10-10
>
> slirp recommends no packages.
>
> slirp suggests no packages.
>
> -- no debconf information
>


-- 
Regards,
Roberto Lumbreras
Debian developer

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