From: Rich Felker <dalias@libc.org>
To: musl@lists.openwall.com
Subject: Re: Re: asctime(0) Segmentation fault
Date: Sat, 19 Apr 2014 23:35:36 -0400 [thread overview]
Message-ID: <20140420033536.GW26358@brightrain.aerifal.cx> (raw)
In-Reply-To: <CAGDMk9G_HfDTBBX6JXTU1v7Y+OVLoouvyza1R56AwWfaFbNr7g@mail.gmail.com>
On Sat, Apr 19, 2014 at 11:33:06PM -0400, John Mudd wrote:
> Yes, asctime(0) might be my bad assumption.
>
> Does this help?
>
> (gdb) backtrace
> #0 a_crash () at ./arch/i386/atomic.h:124
> #1 0xb7fc735b in __asctime (tm=0xbfffde64, buf=0xb7fff288 <buf.1032> "Mon
> Jan 1 00:00:00 12345") at src/time/__asctime.c:26
> #2 0xb7fc91d7 in asctime (tm=tm@entry=0xbfffde64) at src/time/asctime.c:8
> #3 0xb7c89709 in time_asctime (self=0x0, args=0xb7d05bcc) at
> /home/mudd/musl/Python-2.7.6/Modules/timemodule.c:574
> #4 0xb7e1989d in PyCFunction_Call (func=func@entry=0xb7d056cc,
> arg=arg@entry=0xb7d05bcc, kw=kw@entry=0x0) at Objects/methodobject.c:81
Yes. musl's asctime is intentionally crashing when the resulting
string would be >26 bytes rather than silently clobbering whatever
memory lies just beyond the end of the static buffer.
Rich
prev parent reply other threads:[~2014-04-20 3:35 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-04-19 22:16 John Mudd
2014-04-19 22:36 ` Jens Gustedt
2014-04-19 22:46 ` John Mudd
2014-04-20 1:43 ` Szabolcs Nagy
2014-04-20 1:59 ` Rich Felker
2014-04-20 2:43 ` John Mudd
2014-04-20 2:51 ` John Mudd
2014-04-20 3:15 ` Rich Felker
2014-04-20 3:33 ` John Mudd
2014-04-20 3:35 ` Rich Felker [this message]
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