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dac: Add a new func to get DAC label of a running process

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When using qemuProcessAttach to attach a qemu process,
the DAC label is not filled correctly.

Introduce a new function to get the uid:gid from the system
and fill the label.

This fixes the daemon crash when 'virsh screenshot' is called:
https://bugzilla.redhat.com/show_bug.cgi?id=1161831

It also fixes qemu-attach after the prerequisite of this patch
(commit f8c1fb3) was pushed out of order.

Signed-off-by: Luyao Huang <lhuang@redhat.com>
Signed-off-by: Ján Tomko <jtomko@redhat.com>
This commit is contained in:
Luyao Huang 2014-12-09 16:33:57 +08:00 committed by Ján Tomko
parent 82977058f5
commit c7c96647e9
1 changed files with 80 additions and 3 deletions
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83
src/security/security_dac.c
View File

@ -23,6 +23,11 @@
#include <sys/stat.h>
#include <fcntl.h>
#ifdef __FreeBSD__
# include <sys/sysctl.h>
# include <sys/user.h>
#endif
#include "security_dac.h"
#include "virerror.h"
#include "virfile.h"
@ -1236,17 +1241,89 @@ virSecurityDACReserveLabel(virSecurityManagerPtr mgr ATTRIBUTE_UNUSED,
return 0;
}
#ifdef __linux__
static int
virSecurityDACGetProcessLabelInternal(pid_t pid,
virSecurityLabelPtr seclabel)
{
struct stat sb;
char *path = NULL;
int ret = -1;
VIR_DEBUG("Getting DAC user and group on process '%d'", pid);
if (virAsprintf(&path, "/proc/%d", (int) pid) < 0)
goto cleanup;
if (lstat(path, &sb) < 0) {
virReportSystemError(errno,
_("unable to get uid and gid for PID %d via procfs"),
pid);
goto cleanup;
}
snprintf(seclabel->label, VIR_SECURITY_LABEL_BUFLEN,
"+%u:+%u", (unsigned int) sb.st_uid, (unsigned int) sb.st_gid);
ret = 0;
cleanup:
VIR_FREE(path);
return ret;
}
#elif defined(__FreeBSD__)
static int
virSecurityDACGetProcessLabelInternal(pid_t pid,
virSecurityLabelPtr seclabel)
{
struct kinfo_proc p;
int mib[4];
size_t len = 4;
sysctlnametomib("kern.proc.pid", mib, &len);
len = sizeof(struct kinfo_proc);
mib[3] = pid;
if (sysctl(mib, 4, &p, &len, NULL, 0) < 0) {
virReportSystemError(errno,
_("unable to get PID %d uid and gid via sysctl"),
pid);
return -1;
}
snprintf(seclabel->label, VIR_SECURITY_LABEL_BUFLEN,
"+%u:+%u", (unsigned int) p.ki_uid, (unsigned int) p.ki_groups[0]);
return 0;
}
#else
static int
virSecurityDACGetProcessLabelInternal(pid_t pid,
virSecurityLabelPtr seclabel)
{
virReportSystemError(ENOSYS, "%s",
_("Cannot get process uid and gid on this platform"));
return -1;
}
#endif
static int
virSecurityDACGetProcessLabel(virSecurityManagerPtr mgr ATTRIBUTE_UNUSED,
virDomainDefPtr def,
pid_t pid ATTRIBUTE_UNUSED,
pid_t pid,
virSecurityLabelPtr seclabel)
{
virSecurityLabelDefPtr secdef =
virDomainDefGetSecurityLabelDef(def, SECURITY_DAC_NAME);
if (!secdef || !seclabel)
return -1;
if (secdef == NULL) {
VIR_DEBUG("missing label for DAC security "
"driver in domain %s", def->name);
if (virSecurityDACGetProcessLabelInternal(pid, seclabel) < 0)
return -1;
return 0;
}
if (secdef->label)
ignore_value(virStrcpy(seclabel->label, secdef->label,