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To: ALT Linux Team development discussions <devel@lists.altlinux.org>
From: Mikhail Novosyolov <mikhailnov@altlinux.org>
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Date: Sat, 18 Apr 2020 17:12:52 +0300
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=D0=A1=D0=B4=D0=B5=D0=BB=D0=B0=D0=BB chroot =D0=BD=D0=B0 =D0=BE=D1=81=D0=BD=
=D0=BE=D0=B2=D0=B5 http://ftp.altlinux.org/pub/distributions/ALTLinux/ima=
ges/p8/cloud/alt-p8-rootfs-systemd-x86_64.tar.xz

=D0=A1=D0=BE=D0=B7=D0=B4=D0=B0=D0=BB =D0=BF=D0=BE=D0=BB=D1=8C=D0=B7=D0=BE=
=D0=B2=D0=B0=D1=82=D0=B5=D0=BB=D1=8F (useradd --uid 1000 user)

=D0=BD=D0=BE =D0=BD=D0=B5 =D0=BC=D0=BE=D0=B3=D1=83 =D0=B2=D0=BE=D0=B9=D1=82=
=D0=B8 =D0=BF=D0=BE=D0=B4 =D1=8D=D1=82=D0=B8=D0=BC =D0=BF=D0=BE=D0=BB=D1=8C=
=D0=B7=D0=BE=D0=B2=D0=B0=D1=82=D0=B5=D0=BB=D0=B5=D0=BC:

[root@pay2 /]# su - user
su: exec failed

[root@pay2 /]# strace -f su - user -c /bin/bash 2>&1 | grep bin/bash
execve("/bin/su", ["su", "-", "user", "-c", "/bin/bash"], 0x7ffccf65b4a8 =
/* 30 vars */) =3D 0
[pid 37104] execve("/bin/bash", ["-bash", "-c", "/bin/bash"], 0x12fa9a0 /=
* 17 vars */) =3D -1 EAGAIN (=D0=A0=D0=B5=D1=81=D1=83=D1=80=D1=81 =D0=B2=D1=
=80=D0=B5=D0=BC=D0=B5=D0=BD=D0=BD=D0=BE =D0=BD=D0=B5=D0=B4=D0=BE=D1=81=D1=
=82=D1=83=D0=BF=D0=B5=D0=BD)

[root@pay2 /]# sudo -u user -i
-bash: fork: =D0=A0=D0=B5=D1=81=D1=83=D1=80=D1=81 =D0=B2=D1=80=D0=B5=D0=BC=
=D0=B5=D0=BD=D0=BD=D0=BE =D0=BD=D0=B5=D0=B4=D0=BE=D1=81=D1=82=D1=83=D0=BF=
=D0=B5=D0=BD
-bash-3.2$ ls
-bash: fork: =D0=A0=D0=B5=D1=81=D1=83=D1=80=D1=81 =D0=B2=D1=80=D0=B5=D0=BC=
=D0=B5=D0=BD=D0=BD=D0=BE =D0=BD=D0=B5=D0=B4=D0=BE=D1=81=D1=82=D1=83=D0=BF=
=D0=B5=D0=BD

=D0=9A=D0=B0=D0=BA =D1=82=D0=B0=D0=BA=D0=BE=D0=B5 =D0=BC=D0=BE=D0=B6=D0=B5=
=D1=82 =D0=B1=D1=8B=D1=82=D1=8C?!

control su public =D0=BE=D0=B6=D0=B8=D0=B4=D0=B0=D0=B5=D0=BC=D0=BE =D0=BD=
=D0=B5 =D0=BF=D0=BE=D0=BC=D0=BE=D0=B3. =D0=92 /etc/pam.d/ =D0=BD=D0=B8=D1=
=87=D0=B5=D0=B3=D0=BE =D0=BF=D0=BE=D0=B4=D0=BE=D0=B7=D1=80=D0=B8=D1=82=D0=
=B5=D0=BB=D1=8C=D0=BD=D0=BE=D0=B3=D0=BE =D0=BD=D0=B5 =D0=BD=D0=B0=D1=88=D0=
=B5=D0=BB. pam_securetty =D0=BE=D1=82=D0=BA=D0=BB=D1=8E=D1=87=D0=B5=D0=BD=
.