From mboxrd@z Thu Jan  1 00:00:00 1970
From: ludo@gnu.org (Ludovic =?UTF-8?Q?Court=C3=A8s?=)
Subject: bug#24138: SIGSEGV of useradd (from shadow package)
Date: Wed, 03 Aug 2016 18:56:19 +0200
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References: <20160803065906.tgckq77l7k6gqa4w@crashnator.suse.cz>
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To: =?UTF-8?Q?Tom=C3=A1=C5=A1_?= =?UTF-8?Q?=C4=8Cech?= <sleep_walker@gnu.org>
Cc: 24138@debbugs.gnu.org

Hello!

Tom=C3=A1=C5=A1 =C4=8Cech <sleep_walker@gnu.org> skribis:

> It seems to be easy to crash useradd (from shadow package).

Is it on GuixSD?

> from strace:
>
> read(3, "account required pam_deny.so \nau"..., 4096) =3D 223
> open("/gnu/store/2xmwkq2ycwk89xlxnvib5wnjaacfy0rg-linux-pam-1.2.1/lib/sec=
urity/pam_deny.so", O_RDONLY|O_CLOEXEC) =3D 5
> read(5, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\340\6\0\0\0\0\0\0=
"..., 832) =3D 832
> fstat(5, {st_mode=3DS_IFREG|0555, st_size=3D6728, ...}) =3D 0
> mmap(NULL, 2100200, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 5, 0)=
 =3D 0x7fb8b447c000
> mprotect(0x7fb8b447d000, 2093056, PROT_NONE) =3D 0
> mmap(0x7fb8b467c000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MA=
P_DENYWRITE, 5, 0) =3D 0x7fb8b467c000
> close(5)                                =3D 0
> --- SIGSEGV {si_signo=3DSIGSEGV, si_code=3DSEGV_MAPERR, si_addr=3D0x7fb8b=
3d1bda8} ---

Could you check in the =E2=80=98strace=E2=80=99 output whether PAM modules =
build with
another libc are being loaded?

Thanks for your report!

Ludo=E2=80=99.