[Pkg-libvirt-maintainers] Bug#835563: libvirt-daemon-system: virt-aa-helper crashes with filesystem mounts

[Felix Geyer]

Package: libvirt-daemon-system
Version: 2.1.0-2
Tags: patch

Hi,

virt-aa-helper segfaults when starting a VM with a read-only filesystem mount.

The issue is in line virt-aa-helper.c:774
>     if ((sub = strchr(perms, 'R')) != NULL) {
>         /* Don't write the invalid R permission, replace it with 'r' */
>         sub[0] = 'r';

Esentially it overwrites parts of perms which is a const char* parameter.

Attached is a patch that fixes this issue. It first copies perms and then
modifies the local copy.

Cheers,
Felix
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