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Re: musl, printf out-of-memory test
From: |
Rich Felker |
Subject: |
Re: musl, printf out-of-memory test |
Date: |
Tue, 19 Jun 2012 16:08:47 -0400 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Tue, Jun 19, 2012 at 10:04:57PM +0200, Bruno Haible wrote:
> I can reduce the program and the compilation options:
>
> =============================== conftest.c =============================
> #include <stdio.h>
> #include <errno.h>
> int main()
> {
> int ret;
> int err;
> ret = printf ("%.5000000f", 1.0);
> err = errno;
> fprintf (stderr, "printf's return value = %d, errno = %d\n", ret, err);
> return !(ret == 5000002 || (ret < 0 && err == ENOMEM));
> }
> ========================================================================
> $ musl-gcc -g -Wall conftest.c -o conftest
> $ ./conftest > /dev/null ; echo $?
> printf's return value = 5000002, errno = 0
> 0
> $ ./conftest > /dev/null ; echo $?
> printf's return value = 5000002, errno = 0
> 0
> $ ./conftest > /dev/null ; echo $?
> printf's return value = 5000002, errno = 0
> 0
> $ ./conftest > /dev/null ; echo $?
> Speicherzugriffsfehler (Speicherabzug geschrieben)
> 139
> $ ./conftest > /dev/null ; echo $?
> Speicherzugriffsfehler (Speicherabzug geschrieben)
> 139
>
> I couldn't get useful info from gdb.
>
> This is on Linux, 32-bit mode on a 64-bit system. Can you reproduce this?
I can't reproduce it. Do you have a dynamic-linked musl or just
static? I tried both and couldn't reproduce with either. Did you set
resource limits before running it? Are you using any strange kernel
mods? I once heard of a patched kernel setting up other mappings over
top of the not-yet-expanded-into stack space, but I'd be surprised if
more weren't breaking on such a system...
What happened in gdb? Were you unable to get it to crash? What if you
run it under strace?
Rich
- Re: [musl] Re: musl bugs found through gnulib, (continued)
- Re: [musl] Re: musl bugs found through gnulib, idunham, 2012/06/17
- Re: [musl] Re: musl bugs found through gnulib, Rich Felker, 2012/06/18
- Re: [musl] Re: musl bugs found through gnulib, Eric Blake, 2012/06/18
- Re: [musl] Re: musl bugs found through gnulib, Rich Felker, 2012/06/18
- Re: musl, fdopen test, Bruno Haible, 2012/06/19
- Re: musl, fdopen test, Jim Meyering, 2012/06/19
- Re: musl, fdopen test, Bruno Haible, 2012/06/20
- Re: musl, printf out-of-memory test, Bruno Haible, 2012/06/19
- Re: [musl] Re: musl, printf out-of-memory test, Rich Felker, 2012/06/19
- Re: musl, printf out-of-memory test, Bruno Haible, 2012/06/19
- Re: musl, printf out-of-memory test,
Rich Felker <=
- Re: musl, printf out-of-memory test, Bruno Haible, 2012/06/19
- Re: musl, printf out-of-memory test, Rich Felker, 2012/06/19
- Re: musl, printf out-of-memory test, Bruno Haible, 2012/06/20
- Re: musl, printf out-of-memory test, Jim Meyering, 2012/06/20
- Re: musl, printf out-of-memory test, Tom Tromey, 2012/06/21
- Re: [musl] Re: musl bugs found through gnulib, Rich Felker, 2012/06/19
- Re: [musl] Re: musl bugs found through gnulib, Eric Blake, 2012/06/20
- Re: [musl] Re: musl bugs found through gnulib, Rich Felker, 2012/06/20
- Re: grantpt test, Bruno Haible, 2012/06/22
- Re: [musl] Re: musl bugs found through gnulib, Rich Felker, 2012/06/20