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Date: Mon, 29 Oct 2018 16:40:43 +0100
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: Ping crashes
Message-ID: <20181029154043.GS3310@calimero.vinschen.de>
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On Oct 27 15:25, Lavrentiev, Anton (NIH/NLM/NCBI) [C] via cygwin wrote:
> Hello,
>=20
> I have a problem with the ping utility on Cygwin: it keeps crashing with =
segmentation fault.  I've checked that all my packages (including Cygwin co=
re)
> are up to date.  What am I missing?  At any rate, I guess it should not h=
ave crashed ungracefully if it needs something it doesn't have (like a perm=
ission); instead, if should have said so and bail out with an error exit co=
de rather than a stackdump (attached).
>=20
> Thanks,
> Anton Lavrentiev
>=20
> P.S. ping -h works; ping with any IP address -- crashes
>=20
> $ ping 192.168.1.1
> Segmentation fault (core dumped)
>=20
> $ cat ping.exe.stackdump
> Exception: STATUS_ACCESS_VIOLATION at rip=3D001800579D7
> rax=3D0000000180322500 rbx=3D000000018031FCF8 rcx=3D0000000000000000
> rdx=3D0000000000000003 rsi=3D0000000000000003 rdi=3D0000000000000003
> r8 =3D000000000000001F r9 =3D00000000000000FE r10=3D0000000180204E70
> r11=3D00000000FFFFC892 r12=3D0000000000000000 r13=3D0000000000000003
> r14=3D0000000000000001 r15=3D0000000000000000
> rbp=3D0000000000000018 rsp=3D00000000FFFFCAA0
> program=3DC:\cygwin64\bin\ping.exe, pid 6496, thread main
> cs=3D0033 ds=3D002B es=3D002B fs=3D0053 gs=3D002B ss=3D002B

I just pushed a patch supposed to fix this issue.  The bug is actually
worse and potentially affects more than just ping.  Every time a socket,
socketpair, or accept call fails for some reason, there's a potential
SEGV.  Oh, boy, oh boy.

I've just uploaded developer snapshots to https://cygwin.com/snapshots/
Please test.

I think this qualifies for a 2.11.2 release pretty soon...


Thanks,
Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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