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security_context_t happens to be a typedef for char*, and happens to begin with a string usable as a raw context string. But in reality, it is an opaque type that may or may not have additional information after the first NUL byte, where that additional information can include pointers that can only be freed via freecon(). Proof is from this valgrind run of daemon/libvirtd: ==6028== 839,169 (40 direct, 839,129 indirect) bytes in 1 blocks are definitely lost in loss record 274 of 274 ==6028== at 0x4A0515D: malloc (vg_replace_malloc.c:195) ==6028== by 0x3022E0D48C: selabel_open (label.c:165) ==6028== by 0x3022E11646: matchpathcon_init_prefix (matchpathcon.c:296) ==6028== by 0x3022E1190D: matchpathcon (matchpathcon.c:317) ==6028== by 0x4F9D842: SELinuxRestoreSecurityFileLabel (security_selinux.c:382) 800k is a lot of memory to be leaking. * src/storage/storage_backend.c (virStorageBackendUpdateVolTargetInfoFD): Avoid leak on error. * src/security/security_selinux.c (SELinuxReserveSecurityLabel, SELinuxGetSecurityProcessLabel) (SELinuxRestoreSecurityFileLabel): Use correct function to free security_context_t.
LibVirt : simple API for virtualization Libvirt is a C toolkit to interact with the virtualization capabilities of recent versions of Linux (and other OSes). It is free software available under the GNU Lesser General Public License. Virtualization of the Linux Operating System means the ability to run multiple instances of Operating Systems concurrently on a single hardware system where the basic resources are driven by a Linux instance. The library aim at providing long term stable C API initially for the Xen paravirtualization but should be able to integrate other virtualization mechanisms if needed. Daniel Veillard <veillard@redhat.com>
Description
Libvirt provides a portable, long term stable C API for managing the
virtualization technologies provided by many operating systems. It
includes support for QEMU, KVM, Xen, LXC, bhyve, Virtuozzo, VMware
vCenter and ESX, VMware Desktop, Hyper-V, VirtualBox and the POWER
Hypervisor.
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