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Add hw random number generator (/dev/hwrng) to cgroup ACL

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Creating a qemu VM with /dev/hwrng as backend RNG device throws the
following error - "Could not open '/dev/hwrng': Permission denied"
This patch fixes the issue

Signed-off-by: Pradipta Kr. Banerjee <bpradip@in.ibm.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Pradipta Kr. Banerjee 2014-01-16 19:11:17 +05:30 committed by Eric Blake
parent 2636dc8c4d
commit c6320d3463
1 changed files with 13 additions and 1 deletions
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14
src/qemu/qemu_cgroup.c
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@ -1,7 +1,7 @@
/* /*
* qemu_cgroup.c: QEMU cgroup management * qemu_cgroup.c: QEMU cgroup management
* *
* Copyright (C) 2006-2013 Red Hat, Inc. * Copyright (C) 2006-2014 Red Hat, Inc.
* Copyright (C) 2006 Daniel P. Berrange * Copyright (C) 2006 Daniel P. Berrange
* *
* This library is free software; you can redistribute it and/or * This library is free software; you can redistribute it and/or
@ -553,6 +553,18 @@ qemuSetupDevicesCgroup(virQEMUDriverPtr driver,
goto cleanup; goto cleanup;
} }
if (vm->def->rng &&
(vm->def->rng->backend == VIR_DOMAIN_RNG_BACKEND_RANDOM)) {
VIR_DEBUG("Setting Cgroup ACL for RNG device");
rv = virCgroupAllowDevicePath(priv->cgroup, vm->def->rng->source.file,
VIR_CGROUP_DEVICE_RW);
virDomainAuditCgroupPath(vm, priv->cgroup, "allow",
vm->def->rng->source.file, "rw", rv == 0);
if (rv < 0 &&
!virLastErrorIsSystemErrno(ENOENT))
goto cleanup;
}
ret = 0; ret = 0;
cleanup: cleanup:
virObjectUnref(cfg); virObjectUnref(cfg);