github.com/coreos/mantle@v0.13.0/kola/tests/systemd/sysusers.go (about)

     1  // Copyright 2016 CoreOS, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package systemd
    16  
    17  import (
    18  	"github.com/coreos/mantle/kola/cluster"
    19  	"github.com/coreos/mantle/kola/register"
    20  )
    21  
    22  func init() {
    23  	register.Register(&register.Test{
    24  		Run:         gshadowParser,
    25  		ClusterSize: 1,
    26  		Name:        "systemd.sysusers.gshadow",
    27  		Distros:     []string{"cl", "fcos"},
    28  	})
    29  }
    30  
    31  // Verify that glibc's parsing of /etc/gshadow does not cause systemd-sysusers
    32  // to segfault on specially constructed lines.
    33  //
    34  // One line must fit into the character buffer (1024 bytes, unless a previous
    35  // line was longer) but have enough group members such that
    36  //
    37  //     line length + alignment + sizeof(char *) * (#adm + 1 + #mem + 1) > 1024.
    38  //
    39  // The parser would return early to avoid overflow, leaving the static result
    40  // struct pointing to pointers from the previous line which are now invalid,
    41  // causing segfaults when those pointers are dereferenced.
    42  //
    43  // Tests: https://github.com/coreos/bugs/issues/1394
    44  func gshadowParser(c cluster.TestCluster) {
    45  	m := c.Machines()[0]
    46  
    47  	c.MustSSH(m, `sudo sh -c "echo 'grp0:*::root' >> /etc/gshadow"`)
    48  	c.MustSSH(m, `sudo sh -c "echo 'grp1:*::somebody.a1,somebody.a2,somebody.a3,somebody.a4,somebody.a5,somebody.a6,somebody.a7,somebody.a8,somebody.a9,somebody.a10,somebody.a11,somebody.a12,somebody.a13,somebody.a14,somebody.a15,somebody.a16,somebody.a17,somebody.a18,somebody.a19,somebody.a20,somebody.a21,somebody.a22,somebody.a23,somebody.a24,somebody.a25,somebody.a26,somebody.a27,somebody.a28,somebody.a29,somebody.a30,somebody.a31,somebody.a32,somebody.a33,somebody.a34,somebody.a35,somebody.a36,somebody.a37,somebody.a38,somebody.a39,somebody.a40,somebody.a41,somebody.a42,somebody.a43,somebody.a44,somebody.a45,somebody.a46,somebody.a47,a1234' >> /etc/gshadow"`)
    49  	c.MustSSH(m, `sudo sh -c "echo 'grp2:*::root' >> /etc/gshadow"`)
    50  	c.MustSSH(m, `sudo systemd-sysusers`)
    51  }